Performance Evaluation of a Refrigerant-Charged Solar Collector

Kamal, W.A.

doi:10.1016/b978-0-08-025407-4.50041-7

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…One of the disadvantages of refrigerants being used for closed-loop systems is their low efficiency compared to the conventional open-loop systems [100]. However, it is possible to increase the efficiency of the SWH systems by charging the collector to the fullest ensuring the fluid levels in the inlet of the tubes to be nearly the same as the outlet [101]. Radhwan and Zaki HCFCs and hydroflurocarbon (HFC) heat transfer fluids were also tested for their effectiveness on the SWH system performance.…”

Section: Heat Transfer Fluidmentioning

confidence: 99%

An Experimental Study on a Density Driven Solar Water Heating System Using Supercritical CO2 as Working Fluid

Shukla¹

2014

International Journal of Environment and Resource

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An experimental study was performed to investigate the feasibility and performance of thermosyphon solar water heating (SWH) system using R744 (CO2) as the working fluid. The uniqueness of the system was the use of carbon dioxide as a working fluid; which is one of the most promising alternative natural refrigerants. For supercritical carbon dioxide, a small change in temperature or pressure can result in a large change in density, especially close to its critical point. At this pseudo critical region, density decreases rapidly with increase in temperature which aids the thermosyphon flow. An experimental setup in which 1.15 m 2 evacuated tube (U-pipe) solar collector acting as a source as well as an evaporator for the refrigerant, was designed and tested based on this principle. Experimental results have shown that it is possible to induce the natural convective flow even during solar-adverse conditions. Although during winter it was not possible to extract any useful heat gain, the system did show some promising results when operated during spring. The time-averaged collector and heat recovery efficiencies for summer were about 58% and 45%, respectively.

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Section: Heat Transfer Fluidmentioning

confidence: 99%

An Experimental Study on a Density Driven Solar Water Heating System Using Supercritical CO2 as Working Fluid

Shukla¹

2014

International Journal of Environment and Resource

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“…The reported experimental results showed that the TPWH was less efficient than the thermosyphon water heater by an average of 6% for clear sky and by 11 YO for a day with intermittent clouds. Kamal [6] developed a model of two-phase flow and heat transfer in a solar collector tube for steady state and thermal equilibrium conditions. This model was verified utilizing data from the literature.…”

Section: Introductionmentioning

confidence: 99%

Refrigerant-charged integrated solar water heater

Radhwan

Zaki

Jamil

1990

Int. J. Energy Res.

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The performance of two R‐11‐charged integrated solar water heater collectors was investigated experimentally for forced and natural circulation water flows. The heat transfer from the refrigerant loop to the hot water storage tank took place through a condenser of novel design integrated within the collector frame. The effect of the condenser inclination on the system efficiency was remarkable for natural circulation water flow but had no significant effect for forced circulation flow. The difference in thermal response between the refrigerant and water loops caused buildup of stored energy in the condenser. This energy affected the buoyancy forces and generated flow pulsation that caused a harmonic‐like variation of the system efficiency. This effect vanished with forced water circulation flow. The system efficiency varied between 20 and 50% depending on the solar insolation.

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Analysis of refrigerant-charged solar collectors with phase change

Radhwan

Zaki

1993

Heat Recovery Systems and CHP

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Performance Evaluation of a Refrigerant-Charged Solar Collector

Cited by 3 publications

References 8 publications

An Experimental Study on a Density Driven Solar Water Heating System Using Supercritical CO2 as Working Fluid

An Experimental Study on a Density Driven Solar Water Heating System Using Supercritical CO2 as Working Fluid

Refrigerant-charged integrated solar water heater

Analysis of refrigerant-charged solar collectors with phase change

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