Design and optimization of grid Integrated hybrid on-site energy generation system for rural area in AJK-Pakistan using HOMER software

Muti Ur Rehman Tahir; Adil Amin; Ateeq Ahmed Baig; Sajjad Manzoor; Anwar ul Haq; Muhammad Awais Asgha; Wahab Ali Gulzar Khawaja; Muti Ur Rehman Tahir; Adil Amin; Ateeq Ahmed Baig; Sajjad Manzoor; Anwar ul Haq; Muhammad Awais Asgha; Wahab Ali Gulzar Khawaja

doi:10.3934/energy.2021051

AIMS Energy

2021, Volume 9, Issue 6: 1113-1135. doi: 10.3934/energy.2021051

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Research article Special Issues

Design and optimization of grid Integrated hybrid on-site energy generation system for rural area in AJK-Pakistan using HOMER software

1.
Department of Electrical Engineering, Mirpur University of Science and Technology (MUST), Mirpur 10250, AJK, Pakistan
2.
Mirpur Institute of Technology (MIT), Jarikas Campus, Mirpur University of Science and Technology (MUST), Mirpur 10250, AJK, Pakistan
3.
Department of Computer System Engineering, Mirpur University of Science & Technology, (MUST), Mirpur 10250, AJK, Pakistan

Received: 11 August 2021 Accepted: 26 October 2021 Published: 29 October 2021

Power sector plays a crucial role in the development of a country. Rise in population and industrial expansion in developing countries are reason to burdenize the central grid. Pakistan is a country in its developing stages. About 58% of its total energy generation is contributed by fossil fuel based conventional plants for which the fuel costs plenteous amount. In these circumstances it is indispensable to exploit naturally available renewable resources for electricity generation. This study proposes a hybrid hydro-kinetic/Photovoltaic/Biomass system integrated with grid to serve electricity in a residential area of district Kotli in AJK Pakistan. By evaluating available resources and total load demand data of residential consumers, a system design is modelled in HOMER to get techno-economic and optimal design analysis of the purposed system. Using several configurations and combinations of available energy generation systems and then by comparing their results, the most optimum system design is achieved in terms of initial cost, operating cost, cost per unit and net present cost of the system. To further refine the results, the effect of variations of different parameters like load demand, water flow speed and solar irradiance on system is investigated by performing sensitivity analysis on the system. Final results demonstrate that the purposed system is cost-effective and efficient to meet the load demand.

Keywords:

Citation: Muti Ur Rehman Tahir, Adil Amin, Ateeq Ahmed Baig, Sajjad Manzoor, Anwar ul Haq, Muhammad Awais Asgha, Wahab Ali Gulzar Khawaja. Design and optimization of grid Integrated hybrid on-site energy generation system for rural area in AJK-Pakistan using HOMER software[J]. AIMS Energy, 2021, 9(6): 1113-1135. doi: 10.3934/energy.2021051

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Abstract

1. Introduction

In recent years, the mobile Internet has developed rapidly, and mobile device applications (APP) have become an indispensable tool of life for people. Health management applications, especially those developed based on the Android platform, have become the main force in mobile healthcare. A large number of Android health applications can help users manage their real-time health status. If the Internet of Things technology is combined with the medical system to realize the self-health management of the elderly, not only can the quality of life of the elderly be improved, but also the deficiencies of the existing medical system can be better compensated. Therefore, the Internet medical system has broad development prospects. With the increase of age, the perception ability, muscle control and memory ability of the elderly are greatly reduced. In addition, the negative psychological impact makes it impossible for the elderly to use APP as smoothly as younger users. Therefore, from a physical and psychological point of view, the form elements of APP should meet the interface and interaction needs of the elderly. In the research field, some scholars have begun to consider product design issues from the perspective of the elderly, and put forward a series of heuristic principles. In the field of visual perception, with age, the visual perception ability of the elderly weakens. Chan's research team found that with age, the sense of audio-visual synchronization decreases ^[1]. Keogh's research team found that the variability and aiming error of the absolute and relative forces of the elderly are higher than those of the young, indicating that their power control ability is significantly reduced. The weakening of the power control ability of the elderly reflects age-related differences in the distribution and connection of finger power ^[2]. Research results of Andréa et al.. Studies have shown that in addition to age-related cognitive decline, depression can also greatly impair memory ^[3]. Psychologically speaking, the mentality of the elderly tends to be conservative. Unless they understand the application, they usually don't try it. Therefore, in terms of application performance, the elderly must feel that the application is useful, easy to use and effective, and conforms to the cognitive habits of the elderly. Finally, Zhao et al. discussed the cognitive behavior of elderly people using mobile phones and concluded that the overall design should incorporate the physical, psychological and cultural factors of the elderly. Studies have found that the degradation of the elderly is provided by the icon, text, button, color, interface layout and interaction process with more systematic and targeted design principles and methods ^[4]. Curumsing has launched a series of devices and software for sensing, interaction, passive monitoring and emergency assistance to provide a new smart home platform for the elderly. Analysis shows that the software they successfully developed reduces the loneliness of the elderly and makes them feel safer and more caring. In addition, trial participants have a close relationship with the system, and they feel frustrated when the software fails to respond in an expected or expected manner ^[5]. Hussain proposed a human-centered medical perception framework for the elderly and the disabled. The platform is designed to monitor the health of the elderly and the disabled, and provide them with service-oriented emergency response in case of abnormal health conditions. The biggest feature of current work is to effectively use medical resources, provide them with real-time medical services in emergency situations, and expand the social network of the elderly at the same time. The implementation of this system shows that the proposed human-centered sensing system is both efficient and cost-effective in hygiene and first aid ^[6]. However, many applications currently do not consider the physical and mental differences of the elderly. In the process of use, the elderly often encounter experience obstacles. Nowadays, more and more elderly people come into contact with health check applications, so the user experience of the elderly becomes more and more important. Although some medical examination applications have begun to pay attention to the experience of the elderly, the field of evaluation and research on the application of medical examinations for the elderly is blank. The analytic hierarchy process and fuzzy set theory have been widely used in the multi-criteria decision-making process, in which fuzzy numbers are used to more truly represent human judgments. In the past few decades, many articles have been published and some algorithms have been proposed, through which the priority vector can be calculated from the fuzzy comparison matrix ^[7]. Fu proposed a novel comprehensive fuzzy analytic hierarchy process, fuzzy additional ratio evaluation and multi-stage target planning methods to select the best suppliers of duty-free products in the aviation industry ^[8]. Therefore, this research hopes to combine the analytic hierarchy process (AHP) with the fuzzy comprehensive evaluation method to evaluate the experience of the elderly health examination APP, and conduct research from the physical and mental aspects of the elderly to propose more reasonable and consistent evaluation standards. It is suitable for elderly health examination applications that most elderly people are used to. This research first understands the problems and needs of the elderly when using medical examination applications through in-depth interviews, then uses the KJ method to classify and sort the data, and finally uses the analytic hierarchy process and fuzzy theory to analyze the data. It is hoped that the conclusions of this study can provide a reference for the design of medical examination applications for the elderly.

2. Methodology

2.1. Test subject

According to international regulations, seniors over 65 are recognized as seniors. Thirty volunteers who have more than one year of experience in using the health examination application will be recruited, including 20 elderly volunteers over 65 years old and 10 volunteers who are about to enter the elderly. Among the 30 volunteers, they were between 60 and 83 years old, and 3 of them were unable to complete the entire experiment because they could not think independently or express themselves clearly. Therefore, there are 27 valid experimental cases, including 12 males and 15 females, with an average age of 66.32 years.

2.2. In-depth interviews and Kj analysis

Taking into account the health of the elderly, the interview time can be freely adjusted within the range of half an hour to two hours according to the physical condition of different interviewees. The interview consisted of interviewers, recorders and elderly volunteers. The interviewer and recorder are served by two graduate students. Interviewers and recorders are familiar with the purpose of the interview, the process and details of the interview, and have good communication skills with the elderly, maintain the normal conduct of the interview, and always discuss topics related to the elderly health examination APP. The interviewer and the elderly volunteers discussed topics related to the elderly health examination APP, and the recorder recorded and recorded the content of the interview. The process of conducting in-depth interviews is as follows ^[9,10,11,12]: (a) help the elderly volunteers recall their experience of using the health examination application; (b) ask the elderly about their experience in using health examination software; (c) discuss the advantages and disadvantages of using the medical examination application simultaneously; (d) consult elderly volunteers about the future prospects of health check application design. After the interview, according to the interview content, sort out the evaluation elements of the elderly physical examination application. Use KJ analysis method ^[13,14,15] to classify the obtained data hierarchically, and obtain several classifications. Use the in-depth interview method and KJ analysis method to obtain the preliminary needs of elderly users, and conduct a layered analysis of user needs. First, determine the total demand: a satisfactory evaluation of the elderly physical examination APP; second, the total demand is decomposed, and the first-level evaluation is obtained after decomposition. Finally, the multiple specific elements of elderly users obtained through in-depth interviews are regarded as secondary assessments, and the secondary assessment items are classified according to the primary assessment.

2.3. The combination of analytic hierarchy process and fuzzy comprehensive evaluation method

The Combination of Analytic Hierarchy Process ^{[16,17,18,19]} and Fuzzy Comprehensive Evaluation Method ^{[20,21,22,23]} (AHP-Fuzzy). Specifically, AHP is used when determining the factor weight method. Combine the same factors into the same level, and group them according to the affiliation and the degree of association between these factors, thus forming a disjoint multi-level structure model. The evaluation scale is shown in Table 1. The basic process is shown in Figure 1.

Table 1. Quantitative values of judgment scale.

Judgment Scale	Definition	b_ij Assignment
1	Indicates that the two types of factors are of equal importance.	1
3	Indicates that compared with the two types of factors, the score rate of factor i is 10% higher than factor j (i is more important than j)	3
5	Indicates that compared with the two types of factors, factor i has a 20% higher score rate than factor j (i is obviously more important than j)	5
7	Indicates that the score rate of factor i is 30% higher than factor j compared to the two types of factors (i is significantly more important than j)	7
9	Indicates that compared with the two types of factors, factor i has a 40% higher score rate than factor j (i is extremely important than j)	9
2、4、6、8	In the middle of the above two adjacent judgment scales	2、4、6、8
Reciprocal	If the ratio of importance of factor i to factor j is d_ij, then the ratio of importance of factor j to factor i is d_ij = 1/d_ij	d_ij = 1/d_ij

| Show Table

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Figure 1. Evaluation method flow chart.

DownLoad: Full-Size Img PowerPoint

AHP-fuzzy evaluation method can effectively combine the advantages of AHP and fuzzy evaluation method. When the AHP method has fewer evaluation indicators, the time to obtain a consistent judgment matrix is usually shorter and easier to operate ^[24,25,26]. In the comprehensive evaluation of the entire research problem, the fuzzy evaluation method is used as the multi-level evaluation object, which can fully integrate the information contained in each level, and can better reduce the influence of subjective factors on the whole. Thereby improving the scientificity and validity of the evaluation results of research questions. The AHP can solve multi-factor problems by comparing the relative importance of two factors. It is widely used in business management, resource allocation, environment and production decision-making. Although this method is a systematic analysis and decision-making method, it is highly subjective. The fuzzy comprehensive evaluation method integrates the judgment of multiple evaluation subjects and can weaken the deficiencies of the analytic hierarchy process. Therefore, the analytic hierarchy process-fuzzy comprehensive evaluation comprehensive analysis model that combines the two methods can not only systematically consider the influencing factors of the evaluated object, but also reduce the impact of subjective assumptions on the evaluation and decision-making process. The Analytic Hierarchy Process (AHP) is to subdivide difficult decision-making problems into different levels, so as to construct an analytic hierarchy index system that combines scientific qualitative and precise quantification to obtain satisfactory decision-making. Fuzzy comprehensive evaluation method is a comprehensive evaluation method that transforms difficult to determine fuzzy problems into quantitative problems and qualitative problems into quantitative problems. This article effectively combines the analytic hierarchy process and the fuzzy comprehensive evaluation method to establish a mathematical model of comprehensive evaluation.

Weight calculation: λ_max-the maximum eigenvalue of the judgment matrix; M-the corresponding eigenvector. Then, the feature vector M is normalized to obtain the weight W of the importance of each index relative to the index of the previous index. Finally, perform a consistency check.

$CI = ({\lambda _{\max }} - N)/(N - 1)$

(1)

Second, calculate the consistency check results.

$CR = CI/RI$

(2)

In the formula, λ_max-the maximum characteristic quantity of the judgment matrix; N-the number of factors; RI-the random consistency index. If CR < 0.1, the judgment matrix meets the consistency requirement; Once CR is greater than or equal to 0.1, the judgment matrix needs to be modified until the consistency is reached. On the basis of determining the index system, the analytic hierarchy process combined with fuzzy mathematics evaluation method is used to comprehensively evaluate the elderly physical examination APP. It mainly includes 4 steps: first, establish the index evaluation set; A = {B₁, B₂, ...B_N} is the first-level index set, B_i = {B_i1, B_i2...B_in} is the second-level index set. Then, an evaluation judgment matrix is established to determine the fuzzy judgment vector of each index through probability statistics.

${r_{ij}} = {x_{ij}}/N'$

(3)

In the formula, N'-the number of people; x_ij-the frequency at which the index P_i is defined as V_j. Then construct the fuzzy judgment matrix,

$R = \left[ {\begin{array}{*{20}{c}} {{R_1}} \\ {{R_2}} \\ \vdots \\ {{R_n}} \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} {{r_{11}}}&{{r_{12}}}&{{r_{13}}}&{{r_{14}}}&{{r_{15}}} \\ {{r_{21}}}&{{r_{22}}}&{{r_{23}}}&{{r_{24}}}&{{r_{25}}} \\ \vdots & \vdots & \vdots & \vdots & \vdots \\ {{r_{n1}}}&{{r_{n2}}}&{{r_{n3}}}&{{r_{n4}}}&{{r_{n5}}} \end{array}} \right]$

Finally, according to the obtained fuzzy evaluation matrix, combined with the weight W = {W₁, W₂, W₃} determined by the AHP model, the fuzzy evaluation vector is calculated.

$Z = {({W_i}R)^T} = \left[ {\begin{array}{*{20}{c}} {{r_{11}}}&{{r_{12}}}& \cdots &{{r_{n1}}} \\ {{r_{12}}}&{{r_{22}}}& \cdots &{{r_{n2}}} \\ {{r_{13}}}&{{r_{23}}}& \cdots &{{r_{n3}}} \\ {{r_{14}}}&{{r_{24}}}& \cdots &{{r_{n4}}} \end{array}} \right]\left[ {\begin{array}{*{20}{c}} {{w_1}} \\ {{w_2}} \\ \vdots \\ {{w_4}} \end{array}} \right] = \left\{ {{z_1}, {z_2}, {z_3}} \right\}$

(4)

In the formula, W_i-the weight of all levels of indicators. If $\sum {Zi \ne 1}$ it has been normalized, a comprehensive evaluation matrix is constructed.

2.4. Experiment procedure

First, the in-depth interview method is used to conduct research, and the in-depth interview is used to collect the evaluation elements used by the elderly for physical examination applications. Secondly, the KJ analysis method is used to classify the original evaluation elements obtained from the in-depth interviews, and several evaluation indicators of the elderly physical examination APP are extracted. Then, the AHP-fuzzy comprehensive evaluation method is used to analyze and rank the existing evaluation elements. Finally, the hierarchical structure model was drawn and discussed.

3. Results

According to the in-depth interview method, 43 evaluation elements were obtained, represented by X1, X2, X3...X43, as shown in Table 2.

Table 2. Evaluation element list.

Evaluation elements
X₁. Icon design	X₂₃. Note reminder
X₂. Can be directly checked	X₂₄. Real-time monitoring of health data
X₃. Know how to use, get started quickly	X₂₅. Clearly identify useful keys
X₄. Learn fast	X₂₆. Clear system operation buttons
X₅. There are video tutorials	X₂₇. Push information identification screening
X₆. Won't be wrong	X₂₈. User registration is convenient
X₇. Easily return to the main interface	X₂₉. Easy to understand teaching tutorial
X₈. Full functioning	X₃₀. Voice assisted operation
X₉. Voice prompts	X₃₁. Large touch button area
X₁₀. At a glance	X₃₂. Vibration feedback when pressing keys
X₁₁. Smooth and fast operation	X₃₃. Data display logic is clear
X₁₂. Less advertising information	X₃₄. The icons are clear and easy to understand
X₁₃. Menu bar logic is clear	X₃₅. Reasonable distribution of key screen locations
X₁₄. Few advertisement pop-ups	X₃₆. Easy to use and operate
X₁₅. Big font	X₃₇. Interact with children
X₁₆. Loud volume	X₃₈. Simple operation steps
X₁₇. Information scrolling speed is appropriate	X₃₉. Expert medical examination
X₁₈. Color comfort	X₄₀. Doctor-patient interaction
X₁₉. Clear and reasonable color matching	X₄₁. Hospital check-up appointment
X₂₀. More useful functions	X₄₂. Life advice information
X₂₁. Guidance page audio-visual integration	X₄₃. Appointment for health examination in top three hospitals
X₂₂. Automatically generate medical report

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Using the KJ analysis method for classification, the 43 evaluation elements are divided into 10 secondary categories, and the 10 secondary categories are divided into three main categories, namely mobile phone interaction design, ease of operation and functional diversity. Based on the above data, an APP evaluation system for physical examination of the elderly was constructed, as shown in Table 3.

Table 3. Classification table of evaluation elements.

A: App Evaluation System for Elderly health examination
B₁. Mobile phone interaction design	C₁. Smooth operation	X3\7\11\36\38
	C₂. Interface design	X6\10\33\34
	C₃. Easy to identify	X1\15\16\17
	C₄. Interface color	X18\19
B₂. Ease of operation	C₅. Navigation design	X9\13\21\28\30
	C₆. Operation tutorial	X4\5\29
	C₇. Touch button	X25\26\31\32\35
	C₈. Information filtering	X12\14\23\27
B₃. Functional diversity	C₉. Doctor-patient interaction	X39\40
B₃. Functional diversity	C₁₀. Full functioning	X2\8\22\24\37\41\42\43

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Analyze the evaluation index system of the elderly physical examination APP and determine the evaluation index set. The target layer is set to A = (evaluation of physical examination for the elderly). Including 3 first-level indicators: A = {B₁, B₂, B₃}; there are 10 secondary indicators: B₁ = {C₁, C₂, C₃, C₄}; B₂ = {C₅, C₆, C₇, C₈}; B₃ = {C₉, C₁₀}; including 43 three-level indicators: C₁ = {X₃, X₇, X₁₁, X₃₆, X₃₈}; C₂ = {X₆, X₁₀, X₃₃, X₃₄}; C₃ = {X₁, X₁₅, X₁₆, X₁₇}; C₄ = {X₁₈, X₁₉}; C₅ = {X₉, X₁₃, X₂₁, X₂₈, X₃₀}; C₆ = {X₄, X₅, X₂₉}; C₇ = {X₂₅, X₂₆, X₃₁, X₃₂, X₃₅}; C₈ = {X₁₂, X₁₄, X₂₃, X₂₇}; C₉ = {X₃₉, X₄₀}; C₁₀ = {X₂, X₈, X₂₂, X₂₄, X₃₇, X₄₁, X₄₂, X₄₃}. First, perform a hierarchical analysis of the first-level indicators to determine the judgment matrix P of the first-level indicator layer Pi relative to the evaluation target A, as shown in Table 4.

Table 4. Judgment matrix for the weights of first-level indicators.

Project	B₁	B₂	B₃	Weight Value W	Feature Vector
B₁	1	3	3	0.2605	0.781
B₂	3	1	5	0.63335	1.9
B₃	1/3	1/5	1	0.10616	0.318
Consistency Check	CR = 0.037 < 0.1			Pass

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According to Table 4, the weight value W = {0.63335, 0.2605, 0.10616}, W-the weight of the first level indicator relative to the target level A. Similarly, you can calculate the weight of the second-level indicator layer, as shown in Tables 5–7.

Table 5. Weights of secondary indicators of mobile interaction design.

Project	C₁	C₂	C₃	C₄	Weight Value W	Feature Vector
C₁	1	1/5	1/3	3	0.14137	0.565
C₂	5	1	1	5	0.43601	1.744
C₃	3	1	1	3	0.34077	1.363
C₄	1/3	1/5	1/3	1	0.08185	0.327
Consistency Check	CR = 0.072 < 0.1				Pass

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Table 6. Weight values of secondary indicators of ease of operation.

Project	C₅	C₆	C₇	C₈	Weight Value W	Feature Vector
C₅	1	1/3	5	3	0.29135	1.165
C₆	3	1	5	3	0.49093	1.964
C₇	1/5	1/5	1	1/3	0.06704	0.268
C₈	1/3	1/3	3	1	0.15069	0.603
Consistency Check	CR = 0.075 < 0.1				Pass

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Table 7. Weights of secondary indicators of functional diversity.

Project	C₉	C₁₀	Weight Value W	Feature Vector
C₉	1	5	0.83333	1.667
C₁₀	1/5	1	0.16667	0.333
Consistency Check	CR = 0		Pass

| Show Table

DownLoad: CSV

4. Discussion

The reliability analysis of the above evaluation system shows that Cronbach's α coefficient ^[27] is 0.833, which means that the reliability meets the requirements. Therefore, the evaluation system is correct and reliable, and can be used for the design and evaluation of the elderly physical examination APP. Use the analytic hierarchy process to calculate the weight, calculate the weight value of the 10 evaluation elements relative to the first-level indicator, and calculate the weight of each indicator relative to the target layer A. The results are shown in Table 8.

Table 8. Comprehensive table of index weight values.

Criterion layer	Index layer	Secondary Indicator Layer Weight	The Weight of Secondary Indicators Relative to the Overall Goal	The Weight of the First Level Indicator Relative to the Overall Goal
B₁. Mobile phone interaction design	C₁. Smooth operation	0.14137	0.04	0.2605
	C₂. Interface design	0.43601	0.11
	C₃. Easy to identify	0.34077	0.09
	C₄. Interface color	0.08185	0.02
B₂. Ease of operation	C₅. Navigation design	0.29135	0.18	0.63335
	C₆. Operation tutorial	0.49093	0.31
	C₇. Touch button	0.06704	0.04
	C₈. Information filtering	0.15069	0.1
B₃. Functional diversity	C₉. Doctor-patient interaction	0.83333	0.09	0.10616
B₃. Functional diversity	C₁₀. Full functioning	0.16667	0.02	0.10616

| Show Table

DownLoad: CSV

According to Table 8, the weight value of each major index and minor index relative to the overall target can be obtained. Figure 2 shows the ranking of secondary indicators relative to the weight value of the overall goal.

Figure 2. The weight ranking chart of secondary indicators relative to the overall goal.

DownLoad: Full-Size Img PowerPoint

As shown in Figure 2, the weight ranking of the secondary indicators relative to the target layer A is C₆, C₅, C₂, C₈, C₉, C₃, C₁, C₇, C₄, C₁₀. The most important thing in the secondary index layer is the operation tutorial and navigation design. The weights are 0.31 and 0.18, which are far ahead of other indicators. These two indicators belong to the classification of ease of operation, which may be due to the contact of the elderly. The ability to learn new things is poor. Therefore, in the design of the physical examination APP for the elderly, the elderly need the APP to help and guide users to use the physical examination function correctly. Due to the decline in memory and other physiological functions of the elderly, it may be necessary to repeat learning or guidance many times during the use of APP in order to use APP proficiently. Therefore, the navigation function needs to be considered in the design of the software to facilitate the operation of the elderly. There are four auxiliary indicators in the range of 0.05–0.15, namely interface design, easy identification, information filtering and doctor-patient interaction. Among them, interface design, easy identification and information filtering are all due to the degradation of the elderly's sensory system. When the elderly use APP, they need a clear and easy-to-understand interface, a high degree of information recognition ability and fast practical information. Due to the poor discrimination ability of the elderly, it is necessary to consider the function of advertisement filtering in the design of the APP to avoid unnecessary advertisements or pop-up windows causing misoperation by the elderly. At the same time, the elderly pay more attention to their physical health and will often consult and consult health information, so necessary doctor-patient interaction is required. At the same time, smooth operation, interface colors, touch buttons and complete functions are all less than 0.05. This may be due to the slow reaction speed and long thinking time of the elderly when using APP, so indicators such as smooth operation are not easy to use. Since the elderly use mobile devices and do not use too many functions, they do not need too many functions on the APP. There are only 27 topics in this study. The data and information come from senior citizens who have experience using medical examination applications. Old users who have never used the relevant application are not included in the study. Therefore, we need to focus on this category in our follow-up work in order to start studying the needs of the elderly. At the same time, the elderly subjects in this study are all elderly users with normal physical and psychological functions, but do not include elderly users with special physical or psychological symptoms (such as Alzheimer's disease and sensory disorders). Such groups have certain individual differences. These people will need different requirements when using the physical examination application and need to conduct more in-depth research in subsequent work.

5. Conclusions

In summary, first, through in-depth interviews, subjective data on medical examination applications for the elderly were obtained, and 43 evaluation indicators for medical examination applications for the elderly were extracted. Then use the KJ method to classify the information obtained from the interview. The 43 evaluation elements are divided into 10 sub-categories. These 10 sub-categories are divided into 3 main categories, namely mobile phone interaction design and ease of operation, as well as diversification of usability and functions. Finally, the analytic hierarchy process and the fuzzy comprehensive evaluation method are combined to classify and analyze the obtained evaluation indicators, and calculate the weight value of each indicator. Combined with the results of this evaluation study, the design of the elderly physical examination APP should first consider the operation tutorial and navigation design, and combine the navigation function design of video or audiovisual teaching for guidance. Older users perform the operation. Combined with voice prompts to assist operation, with operation guidance video, so that the elderly can quickly master the use of APP skills. Record the operation method of each functional module in the video, so that the elderly can learn how to operate, or in the system navigation design, intelligent assistants and other methods can be used to actively guide the elderly to operate. Secondly, interface design should be considered in the design, easy to identify, information filtering and doctor-patient interaction. These four indicators belong to the scope of the elderly to obtain information, because the elderly are exposed to smart devices for a short time, so they cannot recognize too much information flow. Therefore, the interface design should be concise, clear and easy to identify, and false fraudulent information should be filtered out in advertisements to prevent the elderly from being deceived. Design a clear, easy-to-identify operation interface, filter useless or false information, and communicate effectively with doctors. Let the elderly identify useful information, filter out useless false information and obtain useful information at any time. Finally, there are indicators such as smooth operation, interface colors, touch buttons, and full functions. Considering these conditions in the design of the APP can improve the user experience of the APP.

Conflict of interest

All authors declare no conflicts of interest in this paper.

References

[1]	IRENA R E (2017) Accelerating the global energy transformation. International Renewable Energy Agency, Abu Dhabi.
[2]	HDIP P E Y (2009), Hydrocarbon Development Institute of Pakistan (HDIP). Islamabad.
[3]	Tribune T e. Thermal has largest share in Pakistan's energy mix. he express tribune 2020; Available from: https://tribune.com.pk/story/2240789/thermal-largest-share-pakistans-energy-mix.
[4]	Farooq MK, Kumar S (2013) An assessment of renewable energy potential for electricity generation in Pakistan. Renewable Sustainable Energy Rev 20: 240–254. doi: 10.1016/j.rser.2012.09.042
[5]	Government of pakistan finance division. Pakistan economic survey 2019–20. 2019–20; Available from: http://www.finance.gov.pk/survey_1920.html.
[6]	NEPRA State of industry report 2020.
[7]	Qudrat-Ullah H (2015) Independent power (or pollution) producers? Electricity reforms and IPPs in Pakistan. Energy 83: 240–251. doi: 10.1016/j.energy.2015.02.018
[8]	Patt A, Lilliestam J (2018) The case against carbon prices. Joule 2: 2494–2498. doi: 10.1016/j.joule.2018.11.018
[9]	Mirza UK, Maroto-Valer MM, Ahmad N (2003) Status and outlook of solar energy use in Pakistan. Renewable Sustainable Energy Rev 7: 501–514. doi: 10.1016/j.rser.2003.06.002
[10]	Ahmed MA, Ahmed F, Akhtar MW (2006) Assessment of wind power potential for coastal areas of Pakistan. Turkish J Phys 30: 127–135.
[11]	Uddin W, Khan B, Shaukat N, et al. (2016) Biogas potential for electric power generation in Pakistan: A survey. Renewable Sustainable Energy Rev 54: 25–33. doi: 10.1016/j.rser.2015.09.083
[12]	Government of pakistan finance division. Pakistan Economic Survey 2012–13. Available from: http://www.finance.gov.pk/survey_1213.html.
[13]	Li J, Liu P, Li Z (2020) Optimal design and techno-economic analysis of a solar-wind-biomass off-grid hybrid power system for remote rural electrification: A case study of west China. Energy 208: 118387. doi: 10.1016/j.energy.2020.118387
[14]	Shahzad MK, Zahid A, Rashid T, et al. (2017) Techno-economic feasibility analysis of a solar-biomass off grid system for the electrification of remote rural areas in Pakistan using HOMER software. Renewable Energy 106: 264–273. doi: 10.1016/j.renene.2017.01.033
[15]	Ahmad J, Imran M, Khalid A, et al. (2018) Techno economic analysis of a wind-photovoltaic-biomass hybrid renewable energy system for rural electrification: A case study of Kallar Kahar. Energy 148: 208–234. doi: 10.1016/j.energy.2018.01.133
[16]	Chong WT, Naghavi MS, Poh SC, et al. (2011) Techno-economic analysis of a wind–solar hybrid renewable energy system with rainwater collection feature for urban high-rise application. Appl Energy 88: 4067–4077. doi: 10.1016/j.apenergy.2011.04.042
[17]	Krishan O, Suhag S (2019) Techno-economic analysis of a hybrid renewable energy system for an energy poor rural community. J Energy Storage 23: 305–319. doi: 10.1016/j.est.2019.04.002
[18]	Kamran M, Asghar R, Mudassar M, et al. (2018) Designing and optimization of stand-alone hybrid renewable energy system for rural areas of Punjab, Pakistan. Int J Renewable Energy Res 8: 2385–2397.
[19]	Khan MU, Hassan M, Nawaz MH, et al. (2018) Techno-economic Analysis of PV/Wind/Biomass/Biogas Hybrid System for Remote Area Electrification of Southern Punjab (Multan), Pakistan using HOMER Pro. 2018 International Conference on Power Generation Systems and Renewable Energy Technologies (PGSRET), IEEE.
[20]	Lata-García J, Jurado F, Fernández-Ramírez LM, et al. (2018) Optimal hydrokinetic turbine location and techno-economic analysis of a hybrid system based on photovoltaic/hydrokinetic/hydrogen/battery. Energy 159: 611–620. doi: 10.1016/j.energy.2018.06.183
[21]	Kalinci Y, Hepbasli A, Dincer I (2015) Techno-economic analysis of a stand-alone hybrid renewable energy system with hydrogen production and storage options. Int J Hydrogen Energy 40: 7652–7664. doi: 10.1016/j.ijhydene.2014.10.147
[22]	Jaszczur M, Hassan Q, Palej P, et al. (2020) Multi-Objective optimisation of a micro-grid hybrid power system for household application. Energy 202: 117738. doi: 10.1016/j.energy.2020.117738
[23]	Jaszczur M, Hassan Q (2020) An optimisation and sizing of photovoltaic system with supercapacitor for improving self-consumption. Appl Energy 279: 115776. doi: 10.1016/j.apenergy.2020.115776
[24]	Hassan Q (2021) Evaluation and optimization of off-grid and on-grid photovoltaic power system for typical household electrification. Renewable Energy 164: 375–390. doi: 10.1016/j.renene.2020.09.008
[25]	Ali F, Jiang Y, Khan K (2017) Feasibility analysis of renewable based hybrid energy system for the remote community in Pakistan. 2017 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM), IEEE.
[26]	Ma T, Yang H, Lu L (2014) Development of a model to simulate the performance characteristics of crystalline silicon photovoltaic modules/strings/arrays. Sol Energy 100: 31–41. doi: 10.1016/j.solener.2013.12.003
[27]	2020, Available from: http://betapk.org/potential.html#:~:text=Each%20buffalo%2Fcow%20head%20can, of%20biogas%20(natural%20gas).
[28]	Bhattacharya S, Thomas JM, Salam PA (1997) Greenhouse gas emissions and the mitigation potential of using animal wastes in Asia. Energy 22: 1079–1085. doi: 10.1016/S0360-5442(97)00039-X
[29]	Plūme I, Dubrovskis V, Plūme B (2011) Specified evaluation of manure resources for production of biogas in planning region Latgale. Renewable Energy Energy Effic.
[30]	Perera K, Rathnasiri PG, Senarath SAS, et al. (2005) Assessment of sustainable energy potential of non-plantation biomass resources in Sri Lanka. Biomass Bioenergy 29: 199–213. doi: 10.1016/j.biombioe.2005.03.008
[31]	Pazheri F, Othman M, Malik N (2014) A review on global renewable electricity scenario. Renewable Sustainable Energy Rev 31: 835–845. doi: 10.1016/j.rser.2013.12.020
[32]	Khan MJ, Bhuyan G, Iqbal MT, et al. (2009) Hydrokinetic energy conversion systems and assessment of horizontal and vertical axis turbines for river and tidal applications: A technology status review. Appl Energy 86: 1823–1835. doi: 10.1016/j.apenergy.2009.02.017
[33]	Gorlov A (1981) Hydrogen as an activating fuel for a tidal power plant. Int J Hydrogen Energy 6: 243–253. doi: 10.1016/0360-3199(81)90042-2
[34]	Lodhi M (1988) Power potential from ocean currents for hydrogen production. Int J Hydrogen Energy 13: 151–172. doi: 10.1016/0360-3199(88)90015-8
[35]	Yuce MI, Muratoglu A (2015) Hydrokinetic energy conversion systems: A technology status review. Renewable Sustainable Energy Rev 43: 72–82. doi: 10.1016/j.rser.2014.10.037
[36]	Koko SP, Kusakana K, Vermaak HJ (2015) Micro-hydrokinetic river system modelling and analysis as compared to wind system for remote rural electrification. Electr Power Syst Res 126: 38–44. doi: 10.1016/j.epsr.2015.04.018
[37]	Sood M, Singal SK (2019) Development of hydrokinetic energy technology: A review. Int J Energy Res 43: 5552–5571. doi: 10.1002/er.4529
[38]	Hu Z, X Du (2012) Reliability analysis for hydrokinetic turbine blades. Renewable Energy 48: 251–262. doi: 10.1016/j.renene.2012.05.002
[39]	Leopold LB (1953) Downstream change of velocity in rivers. Am J Sci 251: 606–624. doi: 10.2475/ajs.251.8.606
[40]	Arora VK, Boer GJ (1999) A variable velocity flow routing algorithm for GCMs. J Geophys Res: Atmos 104: 30965–30979. doi: 10.1029/1999JD900905
[41]	Leopold LB, Maddock T (1953) The Hydraulic Geometry of Stream Channels and Some Physiographic Implications.
[42]	Allen PM, Arnold JC, Byars BW (1994) Downstream channel geometry for use in planning‐level models. J Am Water Resour Assoc 30: 663–671. doi: 10.1111/j.1752-1688.1994.tb03321.x
[43]	Mira Power Limited (MPL) I (2014) Environmental and Social Impact Assessment of Gulpur Hydropower Project, HBP Ref.: D4V01GHP.
[44]	Pakistan H B (2014), Cumulative Impact Assessment Gulpur Hydropower Project, HBP Ref.: R4R03GHP.
[45]	Anurag Kumar A p. (cited 2020 Cost Assessment of Hydrokinetic Power Generation. 2017); Available from: https://www.ijarse.com/images/fullpdf/1514970772_TE01-036.pdf.
[46]	Miller VB, Ramde EW, Gradoville RT, et al. (2011) Hydrokinetic power for energy access in rural Ghana. Renewable Energy 36: 671–675. doi: 10.1016/j.renene.2010.08.014
[47]	Johnson JB, Pride DJ (2010) River, tidal, and ocean current hydrokinetic energy technologies: status and future opportunities in Alaska. Prepared Alaska Center Energy Power.
[48]	Rouhani M, Kish GJ (2019) Multiport DC–DC–AC modular multilevel converters for hybrid AC/DC power systems. IEEE Trans Power Delivery 35: 408–419. doi: 10.1109/TPWRD.2019.2927324
[49]	Garmabdari R, Moghimi M, Yang F, et al. (2018) Energy storage sizing and optimal operation analysis of a grid-connected microgrid. International Conference on Sustainability in Energy and Buildings.
[50]	Carpinelli G, Fazio AR, Khormali S, et al. (2014) Optimal sizing of battery storage systems for industrial applications when uncertainties exist. Energies 7: 130–149. doi: 10.3390/en7010130
[51]	Chen SX, Gooi HB, Wang M (2011) Sizing of energy storage for microgrids. IEEE Trans Smart Grid 3: 142–151. doi: 10.1109/TSG.2011.2160745

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