Solar-assisted R22 and R134a heat pump systems for low-temperature applications

Abou-Ziyan, Hosny; Ahmed, Mostafa; Metwally, M.N.; El-Hameed, H. M. Abd

doi:10.1016/s1359-4311(96)00045-2

Cited by 27 publications

(4 citation statements)

References 11 publications

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“…R-134a and Ammonia are two examples of such chemicals [35]. The system which uses R-134a increases COP of the system more than 50%, when compare to R22 refrigerant [48]. So, in this experiment, R-134a has been used.…”

Section: Selection Of Refrigerantmentioning

confidence: 99%

Utilization of Solar Energy for Water Heating Application to Improve Building Energy Efficiency: An Experimental Study

Meena

Prajapati

Kumar³

et al. 2022

Buildings

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The manuscript is written for flow escalation based on an experimental data for a Solar Assisted Heat Pump Water Heater (SAHPWH) increasing building energy efficiency. For the investigation, a Solar Assisted Heat Pump (SAHP) was conceived, manufactured, and tested in real time. The findings of the experiments shows that single glazing with average sun radiation of 600–750 W/m2, COP of approx. 6 can be obtained with identical heat gains. This study shows that when a flat plate collector of area 1.83 m (L) × 1.22 m (W) × 0.1 m (T) with a 0.5-mm-thick black copper plate absorber with clear glazing as a cover receives average radiation of 700 W/m2, then setup can supply 60 litres of water for residential use from 15 °C to 45 °C in approx. 70 min. In addition, the study finds that the collector efficiency factor F’ is likewise shown to have a direct connection with the absorber and an inverse relationship of tube spacing. The findings indicated that the technology has significant commercial potential, particularly in sectors such as with solar resources for improving building energy efficiency.

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Section: Selection Of Refrigerantmentioning

confidence: 99%

Utilization of Solar Energy for Water Heating Application to Improve Building Energy Efficiency: An Experimental Study

Meena

Prajapati

Kumar³

et al. 2022

Buildings

View full text Add to dashboard Cite

show abstract

“…Chata et al, 2005 [31] optimized the COP of the system with individual refrigerant and conclusion came that the best COP is generated by R-12 in comparison with R-22 and R134a. Abou and Ziyan, 1997 [32] carried out numerous studies on R22 and R134a to find the best flowing fluid. Duarlte et al, 2019 [33] compared various refrigerant for Direct Expansion-Solar Assisted Heat Pump (DXSAHP) and the result came that for R290 shows the best result were seen when the solar radiation is 300w/m 2 700w/m 2 for R134a the best result was seen when the radiation are below 50w/m 2 it is also discovered that the COP value and the TEWI value are inversely proportional to each other.…”

Section: Refrigerantmentioning

confidence: 99%

Review on Solar Assisted Heat Pump Water Heating System

Pant¹,

Meena²,

Choudhary³

2022

IJERA

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As with increasing demand of energy it is very necessary to switch into alternate resources of energy as consumption of fossil fuels is resulting in emissions of greenhouse gases which is very harmful for the environment and the energy resources also increasing the prices as the demands are increasing. Almost 30%-40% electricity was consumed in heating the water for domestic purposes hence it is very important and necessary to search for some alternate source for heating the water apart from burning the fossil fuel no other option then solar is best for heating the water. This paper discussed each component of Solar Assisted Heat Pump Water Heating System. In this article flat plate collector, glazing, tube arrangement, compressor with variable speed, condenser coil arrangement, types of refrigerant and a deep about heat pump and direct expansion solar assisted heat pump system is reviewed.

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“…Slesarenko showed that integrating a heat pump to a thermal desalination plant could improve the economical and thermodynamic factors by 2–3 times. Abou‐Ziyan et al reported that the solar assisted heat pump has performance better than that of the conventional heat pump and also using the refrigerant R134a gave better coefficient of performances with respect to R22 and R404a. A review of published work on the physics and modeling of flashing flows is presented by Liao et al The work was aimed to provide an overview of available theoretical models for these sub‐phenomena and corresponding modeling frameworks.…”

Section: Introductionmentioning

confidence: 99%

A novel vacuum wastewater treatment plant integrated with a solar absorption system

Saleh

Al‐Nimr

2019

Int J Energy Res

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Summary In this investigation, a novel use of the solar absorption refrigeration systems was introduced by using it to enhance the operation of vacuum wastewater treatment plant. Wastewater treatment systems require a source of heat for evaporation, a cooling section for condensation and a mean of evacuation to facilitate evaporation. The solar absorption system can take over the first two tasks. Among the commercially available vacuum evaporators, one was selected and modified by replacing the conventional heat pump with the solar absorption system. Two validated mathematical models available in the literature, one for solar absorption subsystem and one for vacuum evaporation subsystem, were integrated together to perform the analysis. The impacts of solar absorption subsystem parameters along with vacuum evaporator subsystem parameters on the overall performance were investigated using the developed program. System performance was evaluated in terms of evaporation rate and condensate rate production. It was found that the degree of superheat had the greatest impact on the rate of evaporation. At low levels of supply temperature to the vacuum chamber, using only heat provided by the absorption system, the evaporation rate exceeded 60 kg/h. If the hot water was further heated by passing through the solar collector storage tank, the evaporation rate exceeded 200 kg/h.

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Solar-assisted R22 and R134a heat pump systems for low-temperature applications

Cited by 27 publications

References 11 publications

Utilization of Solar Energy for Water Heating Application to Improve Building Energy Efficiency: An Experimental Study

Utilization of Solar Energy for Water Heating Application to Improve Building Energy Efficiency: An Experimental Study

Review on Solar Assisted Heat Pump Water Heating System

A novel vacuum wastewater treatment plant integrated with a solar absorption system

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