scholarly journals Experimental and numerical investigation of a novel photovoltaic/thermal system using micro-channel flat loop heat pipe (PV/T-MCFLHP)

2020 ◽  
Vol 15 (4) ◽  
pp. 513-527 ◽  
Author(s):  
Fucheng Chen ◽  
Menglong Hu ◽  
Ali Badiei ◽  
Min Yu ◽  
Zicong Huang ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Heat Pipe ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Filling Ratio ◽  
Thermal System ◽  
Loop Heat Pipe ◽  
Micro Channel ◽  
Photovoltaic Thermal System ◽  
Simulated Solar Radiation

Abstract In this paper, a novel photovoltaic/thermal system using micro-channel flat loop heat pipe (PV/T-MCFLHP) is proposed, and the thermal and electrical performance of the system is investigated theoretically and experimentally. The variations of temperatures were analysed, and the efficiency of the system was calculated under different conditions, i.e. simulated solar radiation, water flow rate and refrigerant filling ratio. The maximum overall efficiency of the system was found to be 51.3%, the thermal efficiency 43.8% and the electrical efficiency 7.5% with the refrigerant filling ratio of 25%, simulated solar radiation of 800 W/m2 and water flow rate of 400 L/h. Test results were compared with simulation results, and the recorded average error was 10.2%.

scholarly journals Improving the Hybrid Photovoltaic/Thermal System Performance Using Water-Cooling Technique and Zn-H2O Nanofluid

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Hashim A. Hussein ◽  
Ali H. Numan ◽  
Ruaa A. Abdulrahman
Keyword(s):  
Flow Rate ◽  
Rear Surface ◽  
Weather Conditions ◽  
Energy Output ◽  
Thermal System ◽  
Water Cooling ◽  
Electrical Efficiency ◽  
Optimum Flow Rate ◽  
Photovoltaic Thermal System ◽  
Cooling Technique

This paper presented the improvement of the performance of the photovoltaic panels under Iraqi weather conditions. The biggest problem is the heat stored inside the PV cells during operation in summer season. A new design of an active cooling technique which consists of a small heat exchanger and water circulating pipes placed at the PV rear surface is implemented. Nanofluids (Zn-H2O) with five concentration ratios (0.1, 0.2, 0.3, 0.4, and 0.5%) are prepared and optimized. The experimental results showed that the increase in output power is achieved. It was found that, without any cooling, the measuring of the PV temperature was 76°C in 12 June 2016; therefore, the conversion efficiency does not exceed more than 5.5%. The photovoltaic/thermal system was operated under active water cooling technique. The temperature dropped from 76 to 70°C. This led to increase in the electrical efficiency of 6.5% at an optimum flow rate of 2 L/min, and the thermal efficiency was 60%. While using a nanofluid (Zn-H2O) optimum concentration ratio of 0.3% and a flow rate of 2 L/min, the temperature dropped more significantly to 58°C. This led to the increase in the electrical efficiency of 7.8%. The current innovative technique approved that the heat extracted from the PV cells contributed to the increase of the overall energy output.

Study on Heat Transfer Characteristics of Loop Heat Pipe for Solar Collector

2012 ◽  
Author(s):  
Shota Sato ◽  
Shigeki Hirasawa ◽  
Tsuyoshi Kawanami ◽  
Katsuaki Shirai
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Heat Transfer Rate ◽  
Solar Collector ◽  
Transfer Rate ◽  
Thermal Conductance ◽  
Filling Ratio ◽  
Working Fluid ◽  
Loop Heat Pipe ◽  
Single Tube

We experimentally study the thermal conductance of single-tube and loop heat pipes for a solar collector. The evaporator of the heat pipe is 1 m long, 6 mm in diameter and has 30° inclination. The thermal conductance is defined as the heat transfer rate divided by the temperature difference between the evaporator-wall and the condenser-wall. Effects of heat transfer rate, saturation temperature of the working fluid, liquid filling ratio, inclination angle, and position of the evaporator on the thermal conductance are examined. We found that the thermal conductance of the 30°-inclined loop heat pipe with an upper-evaporator is 40–50 (W/K), which is 1.8 times higher than that of the vertical loop type and 3 times higher than that of the single-tube type. Thus, the inclined loop heat pipe is preferable for a solar collector. There is an optimum liquid filling ratio. When the liquid filling ratio is too small, a dry-out portion appears in the evaporator. When the liquid filling ratio is too large, the liquid flows in the condenser to decrease heat transfer area. Also we numerically analyze the thermal conductance of a vertical loop heat pipe.

scholarly journals Analysis for sizing of the stand-alone solar photovoltaic thermal system for the residential house at Sultanpur

2020 ◽  
Author(s):  
Shweta Singh ◽  
Rakesh Kumar Singh ◽  
Gopal Nath Tiwari
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Payback Period ◽  
Thermal System ◽  
Significant Finding ◽  
Solar Photovoltaic ◽  
Power Requirement ◽  
Solar Module ◽  
Photovoltaic Thermal System ◽  
Residential House

Abstract Background: In this article, the potential applications of the solar photovoltaic thermal system have been discussed. The increasing cost and rapid depletion of conventional energy, researchers are optimizing the use of solar energy in residential and commercial purposes—the scope of solar energy, providing an alternative for residential and commercial power requirements. The average power requirement of a residential house is calculated with the help of power ratings. Hourly, daily, and monthly power requirement is calculated for designing the optimum size of solar photo voltaic thermal.Results: A stand-alone solar photovoltaic thermal system has been designed. For the sizing of the solar photovoltaic thermal system, meteorological data are collected through Synergy Enviro and PVWatts Calculator. The mathematical calculation and simulation study has been performed to estimate the expected power generation from the PVT. The cash flow and payback period of PVT are calculated. The total cost of installation was rupees 114450/- and the payback period was 9 years approximately.Conclusions: The forecasted output of solar photovoltaic thermal has been calculated based on solar radiation value obtained from different sources. The significant finding of the present study are: The maximum and the minimum electrical load was approximately 7.7 kWh per day in summer and about 2.5 kWh per day in winter. The maximum and minimum solar radiation at the installed site was 7.08 kWh / m 2 / day and 3.32 kWh / m 2 / day. The maximum electrical power calculated by installed solar module is 2466 kWh per year.

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