Experimental study of an air-source heat pump for simultaneous heating and cooling – Part 2: Dynamic behaviour and two-phase thermosiphon defrosting technique

Byrne, Paul; Miriel, Jacques; Lénat, Yves

doi:10.1016/j.apenergy.2011.03.002

Cited by 52 publications

(30 citation statements)

References 15 publications

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“…Leading edge of the boundary layer formation in the round plate fin was changed along the contour of the round plate fin as shown in Figure 3(b). The boundary layer length and thickness was changed with the contour shape of the round plate fin as given in Equation (2). L x,crit , which is the distance after occurrence of the boundary layer interruption between the fins, in Equation (3) was the position of a fully developed boundary layer, or the distance from the leading edge at which transition begins.…”

Section: Boundary Layermentioning

confidence: 99%

“…Usually frost is removed periodically to improve the efficiency of operation. This normally involves heating the surface to melt frost, a costly operation since energy is required to melt frost and the heat exchanger is out of operation during the process, although several researchers suggested the non-costly defrosting techniques for heat pump systems at a laboratory stage as mentioned in Huang et al [1] and Byrne et al [2].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps

2012

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Abstract:The objective of this study was to provide experimental data that could be used to predict frost growth and frost performance of a round plate fin-tube heat exchanger for low temperature heat pumps used in zero emission vehicles under cold weather conditions. In this study, round plate fin-tube heat exchangers were tested with variation of the fin space, air flow rate, relative humidity, and inlet air temperature. Frost height was measured and considered with the boundary layer interruption between fins. Frost height for 8.0 mm of fin space was increased by approximately 91.9% with an increase of relative humidity from 50.0% to 80.0%. The growth rate of frost height at 1.2 m 3 /min was observed to be 13.0% greater than that at 0.8 m 3 /min. Finally, the variation of the blockage ratio with fin space would be an important reference for designing advanced heat exchangers that operate under cold weather conditions.

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Section: Boundary Layermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps

2012

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“…The most important characteristics of the CDT functioning are specific heat fluxes and characteristic temperatures [1][2][3][4][5] for different filling ratios (ε,%). The temperature distributions in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Closed diphasic thermosyphons (CDTs) are considered by many authors [1,2] as sufficiently promising, reliable heat transfer heat exchangers due to their autonomy, structural flexibility, ease of manufacture, lack of moving parts, the need for electricity, pumps, etc. In this connection, it is crucial to study the possibility of using thermosyphons as the main element of the cooling systems of devices, apparatus and equipment [3,4].…”

Section: Introductionmentioning

confidence: 99%

An experimental study of the influence of a thermosyphon filling ratio on a temperature distribution in characteristic points along the vapor channel height

2017

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Abstract.Results of experimental studies of heat transfer in a thermosyphon illustrating the influence of the filling ratio and the heat load on the temperature distribution in the vapor channel, evaporation and condensation zones are presented. The thermosyphon was made of copper and was 161 mm high with side walls 1.5 mm thick, bottom cover 2 mm thick, an internal dimmer of the evaporation part of 54 mm and an internal diameter of the vapor channel of 39.2 mm. Based on the results of experimental studies, temperature dependences were established in the characteristic cross sections of the thermosyphon on the heat flux value supplied to the bottom cover. In addition, a well-appearing thermosyphon self-regulation property has been found -the growth of the heat load in the evaporation zone in the range from 1940 to 7685 W/m 2 does not lead to a decrease in the heat removal intensity from the heat-release region.

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“…For example, Liu et al [19], Zhang et al [20], and Dube et al [21] utilized TPTL heat exchangers to recover heat from exhaust air or waste water for energy conservation; Byrne et al [22,23] recovered waste heat to carry out defrosting for an air-source heat pump by a TPTL. Tu et al [24], Samba et al [25], and Zhu et al [26] developed TPTL heat exchangers for free cooling of Internet data centers in cold seasons.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on two-phase thermosyphon loop with partially liquid-filled downcomer

et al. 2015

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Experimental study of an air-source heat pump for simultaneous heating and cooling – Part 2: Dynamic behaviour and two-phase thermosiphon defrosting technique

Cited by 52 publications

References 15 publications

Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps

Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps

An experimental study of the influence of a thermosyphon filling ratio on a temperature distribution in characteristic points along the vapor channel height

Experimental investigation on two-phase thermosyphon loop with partially liquid-filled downcomer

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