A review on recent development of thermal performance enhancement methods of flat plate solar water heater

Solar Energy ◽  
2020 ◽  
Vol 206 ◽  
pp. 935-961 ◽  
Author(s):  
Elumalai Vengadesan ◽  
Ramalingam Senthil
Keyword(s):  
Flat Plate ◽  
Thermal Performance ◽  
Performance Enhancement ◽  
Solar Water Heater ◽  
Water Heater ◽  
Solar Water

scholarly journals Flat plate solar water heater with closed-loop oscillating heat pipes

2021 ◽  
pp. 192-192
Author(s):  
Piyanun Charoensawan ◽  
Patomsok Wilaipon ◽  
Nopparat Seehawong
Keyword(s):  
Flat Plate ◽  
Flow Rate ◽  
Thermal Performance ◽  
Closed Loop ◽  
Water Flow Rate ◽  
Heat Pipes ◽  
Solar Water Heater ◽  
Water Heater ◽  
Solar Water ◽  
Irradiation Intensity

The flat plate solar water heater, using the closed-loop oscillating heat pipes (CLOHP), was constructed and investigated. The flat plate collector consisted of 10 pipes of CLOHP and the collector area was 1.5?1 m2. Each CLOHP was made of a copper capillary tube with a 1.5 mm inner diameter, a 2.8 mm outer diameter and had 20 turns. The distilled water was used as the working fluid with a filling ratio of 50% the tube?s total internal volume. The evaporator section of the CLOHP was placed on the absorber plate of the collector, and its condenser section was wrapped around the copper tube, in which hot water flowed through. The solar water heater was tested under the solar simulator with halogen lamps generating the uniform artificial solar energy. The irradiation intensity and the water flow rate of the solar water heater were adjusted. It was found that the thermal performance of the solar water heater clearly improved with an increase in the irradiation intensity from 480 to 1086 W/m2. However, the water flow rate in the range of 1.5-3.0 L/min, had a thermal performance that was slightly different. The thermal efficiency of 0.67 was archived at the high irradiation intensity of 947-1086 W/m2. Moreover, the mathematical model to predict the thermal efficiency of the flat plate solar water heater with the CLOHPs was obtained.

Experiment of a Flat Plate Solar Water Heater Collector with Modified Design and Thermal Performance Analysis

2014 ◽  
Vol 624 ◽  
pp. 332-338 ◽  
Author(s):  
Shouquat Hossain ◽  
Ali Wadi Abbas ◽  
Jeyraj Selvaraj ◽  
Ferdous Ahmed ◽  
Nasrudin Bin Abd Rahim
Keyword(s):  
Heat Transfer ◽  
Solar Radiation ◽  
Flat Plate ◽  
Thermal Performance ◽  
Solar Water Heater ◽  
Water Heater ◽  
Pipe Surface ◽  
Solar Water ◽  
Useful Heat ◽  
Absorber Surface

An investigation is reported of the thermal performance of a flat plate solar water heater with a circulating absorber pipe surface. The thermal performance of the 2-side parallel serpentine flow solar water heater depends significantly on the heat transfer rate between the absorber surface and the water, and on the amount of solar radiation incident on the absorber surface. The modified pipe arrangement has a higher characteristic length for convective heat transfer from the absorber to the water, in addition to having more surface area exposed to solar radiation. It means during the operation of water heater, more solar energy is converted into useful heat. However, this modification has reduced the efficiency of the system marginally.

scholarly journals Thermal Performance Enhancement in Flat Plate Solar Collector Solar Water Heater: A Review

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 756 ◽  
Author(s):  
Nurril Ikmal Shamsul Azha ◽  
Hilmi Hussin ◽  
Mohammad Shakir Nasif ◽  
Tanweer Hussain
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Thermal Performance ◽  
Solar Collector ◽  
Performance Enhancement ◽  
Solar Water Heater ◽  
Transfer Enhancement ◽  
Water Heater ◽  
Solar Water ◽  
Flat Plate Solar Collector

Various studies to improve the thermal performance of flat plate solar collector (FPSC) solar water heater have been conducted, and more are currently in progress. This study aims to review existing methods on thermal performance enhancement for FPSC and discuss on heat-transfer enhancement using vibration and its potential application for FPSC. Ten methods for improving thermal performance are identified, which include applications of nanofluids, absorber coatings, phase change materials (PCM), thermal performance enhancers, FPSC design modifications, polymer materials, heat loss reduction, mini and micro channel and heat-transfer enhancement using vibration. An examination of heat-transfer enhancement using vibration in low frequency ranges for an evacuated-tube solar collector (ETSC) solar water heater system showed that it can potentially achieve heat-transfer enhancement of up to 78%. Nevertheless, there is still a lack of research on the applications of heat-transfer enhancement using vibration on FPSC to date.

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