Study on a direct-expansion solar-assisted heat pump water heating system

Kuang, Yifang; Sumathy, K.; Wang, Ruzhu

doi:10.1002/er.893

Cited by 123 publications

(36 citation statements)

References 14 publications

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“…A particularly relevant paper was published by Kuang et al [10] who based on an experiment and through COP and collector efficiency determine the storage volume and recommended an optimum ratio of product storage and collector area equivalent to 75 to 125 L/m 2 . Additionally, an experiment conducted by Anderson et al [11] changed the configuration of the thermal storage unit, integrating a coil on its walls.…”

Section: Design Of the Thermal Storage Unitmentioning

confidence: 99%

Mathematical Thermal Modelling of a Direct-Expansion Solar-Assisted Heat Pump Using Multi-Objective Optimization Based on the Energy Demand

León-Ruiz

Carvajal-Mariscal

2018

Energies

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An analytical model is proposed to evaluate the performance of a Direct Expansion Solar-Assisted Heat Pump under a given environmental condition. These thermal machines commonly employ uncovered flat plate solar collectors, and given this, the convection phenomenon is taken into account as well as the effect of the diffuse and reflected solar radiation in addition to the normal beam radiation absorbed by the tilted surface of the collectors. The heat pump cycle is modelled through a first law of thermodynamics approach in order to compute the heat yielded through condensation and the minimum heat required by the volume of water in the thermal storage unit. Consequently, the thermal capacity of the heat pump, the ratio at which the system yields heat to a given load of water, is calculated and discussed. The results of the model proposed are compared with the experimental data provided by three research papers with experiments conducted in different geographic coordinates and test rigs operating during diverse atmospheric conditions. A maximum relative error of 20% was obtained and furthermore, a statistical analysis of the data was conducted having found that there is no significant statistical difference between the analytical and experimental data samples within the 95% confidence interval. Finally, based on the thermal capacity, the performance of the heat pump is evaluated and a multi-objective optimization technique is implemented to obtain the best possible combination of factors to further enhance the performance of the heat pump.

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Section: Design Of the Thermal Storage Unitmentioning

confidence: 99%

Mathematical Thermal Modelling of a Direct-Expansion Solar-Assisted Heat Pump Using Multi-Objective Optimization Based on the Energy Demand

León-Ruiz

Carvajal-Mariscal

2018

Energies

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Section: Model Of Pv/t Evaporatormentioning

confidence: 99%

“…h con and h rad are the respective heat loss coefficients of the convective and radiation heat transfer between the surface of PV/T and ambient air, and can be evaluated by using Equations (4) and (5) [21], separately: As mentioned previously by many researchers, the performance of PV cells could deteriorate with increases in its working temperature. The dependences of crystalline silicon cells' electric efficiency, η pv , was evaluated by Zondag et al [22]:…”

Section: Model Of Pv/t Evaporatormentioning

confidence: 99%

Simulation of Hybrid Photovoltaic Solar Assisted Loop Heat Pipe/Heat Pump System

Dai

et al. 2017

Applied Sciences

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Abstract:A hybrid photovoltaic solar assisted loop heat pipe/heat pump (PV-SALHP/HP) water heater system has been developed and numerically studied. The system is the combination of loop heat pipe (LHP) mode and heat pump (HP) mode, and the two modes can be run separately or compositely according to the weather conditions. The performances of independent heat pump (HP) mode and hybrid loop heat pipe/heat pump (LHP/HP) mode were simulated and compared. Simulation results showed that on typical sunny days in spring or autumn, using LHP/HP mode could save 40.6% power consumption than HP mode. In addition, the optimal switchover from LHP mode to HP mode was analyzed in different weather conditions for energy saving and the all-year round operating performances of the system were also simulated. The simulation results showed that hybrid LHP/HP mode should be utilized to save electricity on sunny days from March to November and the system can rely on LHP mode alone without any power consumption in July and August. When solar radiation and ambient temperature are low in winter, HP mode should be used.

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“…CO 2 (R744) is the natural refrigerant which imposes negligible effect on the environment. CO 2 has a very low Ozone Depletion Potential (ODP) and Global Warming Potential (GWP) [1]. Carbon dioxide is colorless, odorless, naturally occurring gas.…”

Section: Co 2 : Promising Refrigerantmentioning

confidence: 99%

Performance Evaluation of Solar Assisted Heat Pump Water Heating System

R.N¹

2013

IOSRJEN

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:The application of solar thermal energy in water heating system has received more attention in recent years. The solar water heaters is used both in domestic and industrial use. The variation of solar intensity and atmospheric condition is key issue in determining the performance of solar water heater. The conventional thermosyphon solar water heaters fail to provide hot water supply round the clock in low temperature regions. The use heat pump with solar water heating system provides better water management. The COP of heat pump increases with increase in solar intensity and is energy efficient compared to conventional solar water heaters with electric or gas boosters as auxiliary heat source.The main objective of this paper is to compare the performance of heat pump assisted solar water heater to conventional solar water heating system for low ambient temperature application. The theoretical analysis of solar water heater with heat pump integration is presented which shows that the collector efficiency and output water temperature can be increased compared to conventional solar water heaters under same solar intensity and ambient condition.

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Study on a direct-expansion solar-assisted heat pump water heating system

Cited by 123 publications

References 14 publications

Mathematical Thermal Modelling of a Direct-Expansion Solar-Assisted Heat Pump Using Multi-Objective Optimization Based on the Energy Demand

Mathematical Thermal Modelling of a Direct-Expansion Solar-Assisted Heat Pump Using Multi-Objective Optimization Based on the Energy Demand

Simulation of Hybrid Photovoltaic Solar Assisted Loop Heat Pipe/Heat Pump System

Performance Evaluation of Solar Assisted Heat Pump Water Heating System

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