Influence of fin thickness on heat transfer and flow performance of a parallel flow evaporator

Abstract

This paper studies numerically the influence of the louver's fin thickness on heat transfer and flow performance of a parallel flow evaporator, a comprehensive evaluation and analysis of the five structures at different Reynolds numbers are systematically carried out. Comparison of the numerical results with the experimental data shows good agreement with maximal errors of 12.16% and 5.29% for the heat transfer factor and the resistance factor, respectively. The results show that the heat transfer coefficient and the pressure drop increase with the increase of the thickness of the louver fins when the Reynolds number is a constant. The analysis of the comprehensive evaluation factor shows that the A-type fin is the best, and it can effectively strengthen the heat exchange on the air side and improve the heat transfer capacity of the system. The research results can provide reference for the structural optimization of the louver fins.

Improving the efficiency of heat recovery circuits of cogeneration plants with combustion of water-fuel emulsions

“…A depth of utilizing the heat of engine exhaust gas influences considerably on the efficiency of any thermal power plant from cogenerative ICE [3] and gas turbines [4] to trigenerative plants generating heat [5], electricity power [6] and cooling [7] (refrigeration and air conditioning), i.e. practically in all waste heat recovery technics [8,9].…”

Experimental study on the thermal performance of an air conditioning system in a pure electric vehicle

“…Yan et al controlled the evaporator outlet superheat through a new kind of electronic expansion valves, and discovered that the evaporator capacity increased along with the decrease of evaporator outlet superheat [11] . For electric vehicle heat pump air conditioning systems, energy saving, high efficiency and security have gradually become the focus of major automobile manufacturers in the choice of new energy vehicle configurations, but the structure is complex, low-temperature performance is poor, so we also need to solve these problems [12][13][14][15][16][17] . At present, many researchers have conducted in-depth research on the thermal performance of automotive air conditioning systems, however, there are few reports on the air conditioning system performance of heat pump pure electric vehicles with low-pressure gas-mixing systems by the evaporator outlet superheat changes.…”

Experimental study on performance of medium-pressure air-supply heat pump air conditioning system for pure electic bus

“…Dutta et al [13] carried out an experimental study on the quasi-two-stage compression cycle characteristics of scroll compressors, and Tang et al [14] carried out an experimental study on the application of air supply technology to the air conditioning system of pure electric vehicles. Li et al [15] simulated the heat transfer performance of evaporator in the air-supply system. In this paper, R410A is used as refrigerant, and a microchannel parallel flow heat exchanger is used in both internal and external heat exchangers, the performance of heat pump air conditioning system for pure electric bus under extreme conditions of ultra-high temperature in summer and of ultra-low temperature in winter is studied by using medium-pressure air-supply technology with economizer.…”