Heat-pipe enhanced solar-assisted heat pump water heater

Huang, Bin‐Juine; Lee, J.P.; Chyng, J.P.

doi:10.1016/j.solener.2004.08.009

Cited by 72 publications

(26 citation statements)

References 2 publications

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“…Some of them, e.g. [13], refers to variable speed compressors, others [14,15] propose the simpler household refrigeration technology to be used as the heat pump system. For the variable capacity compressors configuration different fluids are being tried [16].…”

Section: Also For This Reason There Is a Growing Interest Around Isahmentioning

confidence: 99%

Integrated solar-assisted heat pumps for water heating coupled to gas burners; control criteria for dynamic operation

Scarpa¹,

Tagliafico²,

Tagliafico³

2011

Applied Thermal Engineering

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A direct expansion integrated solar assisted heat pump (ISAHP) is compared to a traditional flat plate solar panel for low temperature (45 °C) water heating applications. The (simulated) comparison is accomplished assuming both the devices are energy supplemented with an auxiliary standard gas burner, to provide the typical heat duty of a four-member family. Literature dynamical models of the systems involved have been used to calculate the main performance figures in a context of actual climatic conditions and typical stochastic user demand.The paper highlights new heat pump control concepts, needed when maximum energy savings are the main goal of the apparatus for given user demand. Simulations confirm the high collector efficiency of the ISAHP when its panel/evaporator works at temperature close to the ambient one. The device, with respect to a flat plate solar water heater, shows a doubled performance, so that it can do the same task just using an unglazed panel with roughly half of the surface.

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Section: Also For This Reason There Is a Growing Interest Around Isahmentioning

confidence: 99%

Integrated solar-assisted heat pumps for water heating coupled to gas burners; control criteria for dynamic operation

Scarpa¹,

Tagliafico²,

Tagliafico³

2011

Applied Thermal Engineering

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“…The LHP is a two-phase heat-transfer measure with the working fluid circulating in a loop, thus enabling remote and passive heat transfer at enhanced capacity. Due to its simple operation and environmental effect, LHP has been widely used in the thermal control of satellites and electronics [12][13][14] and it has gradually been gaining attention in the field of solar energy collection and transportation [15][16][17]. The LHP mode is passive, which means it does not consume work.…”

Section: Introductionmentioning

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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“…Vasiliev [14,15] applied the micro and miniature heat pipes in modern heat exchangers for cooling electronic components. Huang et al [16,17] used a heat pipe in the solar-assisted heat pump water heater system. Liu et al [18] considered the effects of length of the evaporator, vapour temperature on the critical values of the upper and lower boundaries.…”

Section: Introductionmentioning

confidence: 99%

Performance investigation of heat pipe using aqueous solution of n-Pentanol with different inclinations

2011

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The orientation of the heat pipe plays the significant role in its performance. In specific orientations, the performance of the heat pipe is directly related to the wick structure. In conventional heat pipe, the working fluid is used a negative surface-tension gradient with temperature. It is an unfavorable one and it decreases the heat transport between the evaporator section and the condenser section. An Aqueous solution of n-Pentanol having a positive surface tension gradient with temperature is suggested as a working medium for heat pipe to improve the performance of capillary limit and operating stability. The objective of this paper is to perform a comparative study of heat pipe performance using the aqueous solution of n-Pentanol with water at various inclinations. The results are presented to demonstrate the merits and suitability of the aqueous solution of n-Pentanol as a working fluid for heat pipe.

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Heat-pipe enhanced solar-assisted heat pump water heater

Cited by 72 publications

References 2 publications

Integrated solar-assisted heat pumps for water heating coupled to gas burners; control criteria for dynamic operation

Integrated solar-assisted heat pumps for water heating coupled to gas burners; control criteria for dynamic operation

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

Performance investigation of heat pipe using aqueous solution of n-Pentanol with different inclinations

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