Experimental analysis of a heat pipe operated solar collector using water–ethanol solution as the working fluid

Solar Energy ◽  
2015 ◽  
Vol 118 ◽  
pp. 267-275 ◽  
Author(s):  
A. Jahanbakhsh ◽  
H.R. Haghgou ◽  
S. Alizadeh
Keyword(s):  
Heat Pipe ◽  
Experimental Analysis ◽  
Solar Collector ◽  
Ethanol Solution ◽  
Working Fluid

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.

Experimental investigation of the effect of using water and ethanol as working fluid on the performance of pyramid-shaped solar still integrated with heat pipe solar collector

Solar Energy ◽  
2020 ◽  
Vol 207 ◽  
pp. 10-21 ◽  
Author(s):  
Rasoul Fallahzadeh ◽  
Latif Aref ◽  
Nabiollah Gholamiarjenaki ◽  
Zeinab Nonejad ◽  
Mohammadreza Saghi
Keyword(s):  
Experimental Investigation ◽  
Heat Pipe ◽  
Solar Collector ◽  
Working Fluid ◽  
Solar Still

scholarly journals Numerical study of flat plate solar collector performance with square shape wicked evaporator

2019 ◽  
Vol 12 (2) ◽  
pp. 90-97
Author(s):  
Basil Noori Merzah ◽  
Majid H. Majeed ◽  
Fouad A. Saleh
Keyword(s):  
Flat Plate ◽  
Heat Pipe ◽  
Flow Rate ◽  
Solar Collector ◽  
Numerical Study ◽  
Charge Ratio ◽  
Working Fluid ◽  
Evaporator Section ◽  
Fill Charge Ratio ◽  
Flat Plate Solar Collector

In this work, a system of a heat pipe is implemented to improve the performance of flat plate solar collector. The model is represented by square shape portion of the evaporator section of wicked heat pipe with a constant total length of 510 mm, and the evaporator section inclined by an angle of 30o. In this models the evaporator, adiabatic and condenser lengths are 140mm, 140mm, and 230mm respectively. The omitted energies from sunlight simulator are 200, 400, 600, 800 and 1000 W/m2 which is close to the normal solar energy in Iraq. The working fluid for all models is water with fill charge ratio of 240%. The efficiency of the solar collector is investigated with three values of condenser inlet water temperatures, namely (12, 16 and 20o C). The numerical result showed an optimum volume flow rate of cooling water in condenser at which the efficiency of collector is a maximum. This optimum agree well with the ASHRAE standard volume of flow rate for conventional tasting for flat plate solar collector. When the radiation incident increases the thermal resistance of wicked heat pipe is decreases, where the heat transfer from the evaporator to condenser increases. The numerical results showed the performance of solar collector with square shape evaporator greater than other types of evaporator as a ratio 15 %.

scholarly journals The effect of different working fluids and internal geometries on the efficiency of evacuated tube heat pipe solar collectors

2020 ◽  
Vol 31 (4) ◽  
pp. 16-25
Author(s):  
Jean Gad Mukuna ◽  
Jasson Gryzagoridis
Keyword(s):  
Heat Pipe ◽  
Solar Collector ◽  
Working Fluid ◽  
Water Tank ◽  
Solar Simulator ◽  
Working Fluids ◽  
Average Irradiance ◽  
Evacuated Tube ◽  
Mobile Frame ◽  
Experimental Rig

In this study, a heat pipe was modified with designed and manufactured inserts of specific profiles in order to investigate the effect of the internal geometries and working fluids on the efficiency of the evacuated tube heat pipe solar collector. The experimental rig was made of a mobile frame, an insulated water tank, a solar simulator and an evacuated tube heat pipe. Using an average irradiance of 700 watts per square meter, the indoor tests were conducted first on a heat pipe without any working fluid (dry mode) and later on the heat pipe containing, in turn, each of the six working fluids for each of the five geometries. Results show that, when inserting different profiles in the heat pipe, there is an enhancement of the heat transfer and hence an increase in the efficiency of the evacuated heat pipe solar collector.

An Experimental Investigation of Heat Pipe Flat-Plate Solar Collector with Water-Ethanol Mixture as a Working Fluid

2014 ◽  
Vol 592-594 ◽  
pp. 1413-1417
Author(s):  
Pravin R. Harde ◽  
Ashok T. Pise ◽  
Balasao D. Kusure
Keyword(s):  
Experimental Investigation ◽  
Heat Pipe ◽  
Flow Rate ◽  
Solar Collector ◽  
Filling Ratio ◽  
Maximum Efficiency ◽  
Working Fluid ◽  
Condenser Section ◽  
Ethanol Mixture ◽  
Flat Plate Solar Collector

The objective of the present study is to investigate the performance of solar collector with serpentine shape of heat pipe and water-ethanol as a working fluid. Serpentine shape is easy of manufacturing and also to reduce cost of manufacturing. In this work, heat pipe is made from copper tube having ID 10mm and OD 12mm.The tube is bent in serpentine manner and filled with Water-ethanol as a working fluid with 70% filling ratio. The length of evaporator, adiabatic and condenser section was 480mm, 50mm and 65mm respectively. The test is conducted for coolant flow rate 4.5 kg/hr different angle of collector 20°, 31.5°, 40°, 50°, 60°. Result shows that water-ethanol collector gives better performance than collector with water as a working fluid. Maximum efficiency is observed at 31.5° inclination.

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