Comparative analysis of heat loss performance of flat plate solar collectors at different altitudes

Wang, Dengjia; Fan, Bohao; Chen, Yaowen; Han, Ya; Liu, Yanfeng; Wang, Yingying; Liu, Huaican; Jiao, Xuefeng

doi:10.1016/j.solener.2022.08.060

Cited by 15 publications

(5 citation statements)

References 24 publications

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“…However, there was not enough information provided about the modelling approach. 15 In addition, a similar study on the flat plate collector has already been covered way before in Dhaundiyal and Gabrielmichael's work. 6 Zheng et al examined the solar heating cooling system integrated with a parabolic trough collector (PTC).…”

Section: Introductionmentioning

confidence: 85%

“…22 Singh et al provided valuable insight into the recent development in the artificial roughened surface of the absorber plate, the flow pattern of the medium, and the scope of multi-passes in the solar air collector. 23 After reviewing, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] it was seen that the mathematical models are the energy equations that are solved using the computation software. A new approach was not seen except in the study by Gopi et al 17 In this article, a unique approach was adopted that is based on nonlinear system identification without using rudimentary algebra or statistical models.…”

Section: Introductionmentioning

confidence: 99%

“…The maximum deviation in convective heat loss and radiative heat loss exceeded 50%. However, there was not enough information provided about the modelling approach 15 . In addition, a similar study on the flat plate collector has already been covered way before in Dhaundiyal and Gabrielmichael's work 6 .…”

Section: Introductionmentioning

confidence: 99%

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Developing a thermodynamic model for the circulating air using an opaque system

Dhaundiyal,

Toth

2023

Energy Science & Engineering

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The paper focuses on energy modelling that involves a concatenated structure of a linear time‐invariant system. A block‐structured (BS) technique was adopted for a nonlinear system identification. Using the superimposition principle, the model mapped the thermodynamic state variables as an indirect function of time to the output function. The available energy and degradation of solar radiation are determined through a black box model. For testing and validation purposes, a solar collector with recirculating air was considered. The basic principle is to establish a relation between state variables and the performance parameters, without invoking the conventional thermodynamic relationship between them. The output of the model was compared with the validation data to ensure whether or not there was any affinity between them. The sigmoidal, wavenet, and polynomial forms of nonlinearity provided a good fit to the experimental dataset. The mean absolute percentage error encountered while estimating the collector efficiency was noticed to vary from −4.85 × 10−03% to 1.22 × 10−03%. Similarly, it falls in the domain of −4.73 × 10−04% to 7.78 × 10−02% for the second law efficiency. The maximum heat loss rate (BS model) obtained across the first and second passages of the solar air collector was 235.41 and 218.19 W at the air mass flow rate of 8.10 g/s, which is congruent to the validation dataset.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Developing a thermodynamic model for the circulating air using an opaque system

Dhaundiyal,

Toth

2023

Energy Science & Engineering

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“…Ma et al [9] set the lower dead zone of the switch control strategy and the temperature difference of the continuous control strategy for PV/T to improve system performance. Liu et al [10] divided the operating modes of solar heat pumps coupled with wind energy storage heating systems into three types in order to adjust to environmental disturbances and fluctuations and achieve flexible operation.…”

Section: Introductionmentioning

confidence: 99%

Operating Performances of the Water-source Heat Pump System Coupled with PV/T Collector for Heating

Sun,

Zhang,

Zheng

et al. 2023

J. Phys.: Conf. Ser.

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An energy supply system that can achieve complementary usage of solar and electric energy is the PV/T collector linked water-source heat pump and electric boiler composite system. TRNSYS simulates the system in this study after each piece of equipment is given a mathematical model. The inlet and outlet water temperatures of the evaporator side and condenser side of the water-source heat pump, the inlet and outlet temperatures of the electric boiler, and the inlet and outlet water temperatures of the source side and load side of the thermal storage tank are all examined in order to determine how well the system operates. The findings demonstrate that by warming the water in the water collecting tank, PV/T performs admirably as a low-temperature heat source for the evaporator side of the water-source heat pump. The condenser side, in contrast, consistently produces hot water at 45°C. The load side of the storage tank’s outlet temperature is between 43°C and 45°C, which is sufficient to suit the users’ heating needs. The source side of the storage tank additionally receives 50°C hot water heated by the electric boiler at night.

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“…Subiantoro and Ooi [4] developed analytical methods for the calculation of the heat losses from the top of the collector. Wang et al [5] performed a comparative analysis of the convection and radiation heat losses on the surface of FPC for different altitudes and studied the effects of the environmental conditions such as air pressure and density. He et al [6] conducted an experimental analysis on the effect of nanofluids on flat plate collectors' efficiencies and calculated the optimum concentration of nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Optical Analyses of a Hybrid Solar Photovoltaic/Thermal (PV/T) Collector with Asymmetric Reflector: Numerical Modeling and Validation with Experimental Results

et al. 2023

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This study presents a combined thermal and optical, three-dimensional analysis of an asymmetric compound parabolic collector (ACPC) with an integrated hybrid photovoltaic/thermal (PV/T) receiver with the aim of establishing a sustainable approach in two ways: firstly, by determining the optimal tilt angle for operations, and secondly, by introducing an innovative simulation method which reduces computational cost while calculating thermal performance. Initially the Incident Angle Modifier ( ) was calculated for a wide range of incident angles, and the ray-tracing results were verified using three different simulation tools (Tonatiuh, COMSOL, and SolidWorks) with mean deviations being lower than 4%. The optimal tilt angle of the collector was determined for seven months of the year by conducting a detailed ray-tracing analysis for the mean day of each month considering whole day operation. In the thermal analysis part, the authors introduced novel numerical modeling for numerical simulations. This modeling method, designed with sustainability in mind, enables lighter computational domains for the air gap while achieving accurate numerical results. The approach was established using two distinct simulation tools: COMSOL and SolidWorks. From the optical analysis, it was found that in all months examined there is a four-hour time range around solar noon in which the optimum tilt angle remains constant at a value of 30°. The numerical models constructed for the thermal analysis were verified with each other (6.15% mean deviation) and validated through experimental results taken from the literature regarding the examined collector (<6% mean deviation). In addition, the two simulation tools exhibited a deviation of around 6% between each other. Finally, the thermal performance of the collector was investigated for the mean day of September at solar noon by adopting the optimal tilt angle for that month according to the optical analysis, considering inlet temperatures from 20 °C up to 80 °C.

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Comparative analysis of heat loss performance of flat plate solar collectors at different altitudes

Cited by 15 publications

References 24 publications

Developing a thermodynamic model for the circulating air using an opaque system

Developing a thermodynamic model for the circulating air using an opaque system

Operating Performances of the Water-source Heat Pump System Coupled with PV/T Collector for Heating

Thermal and Optical Analyses of a Hybrid Solar Photovoltaic/Thermal (PV/T) Collector with Asymmetric Reflector: Numerical Modeling and Validation with Experimental Results

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