Automobile air-conditioning using a rotary absorption/recompression system

Riffat, Saffa; Wong, Chee‐Woon; Shankland, N.

doi:10.1016/0306-2619(94)90054-x

Cited by 1 publication

(1 citation statement)

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“…Due to the engine operational mode, this input energy is not totally invested at the brake output power due to losses in the exhaust system, in the cooling system, and in the HVAC (heating, ventilation, and air conditioning) system of the vehicle [1][2][3]. To increase the efficiency of the engine, the large studies in the literature reveal that one has either to reduce energy lost in the exhaust system or to use some of it [4][5][6][7], to increase and/or control the efficiency of the cooling system [8][9][10][11], to manage well the energy consumption of the HVAC system [12][13][14][15], or to act on the engine design and/or combustion issues in order to increase the chemical energy and relative brake net power [16][17][18][19][20]. In this existent literature were scarce studies on aerothermal effects, which can in a later stage improve the management of the energy balance in a well controlled vehicle.…”

Section: Introductionmentioning

confidence: 99%

Energy Management in Car Underhood Compartment—Temperature and Heat Flux Analysis of Car Inclination Effects

Khaled

Hage

Harambat

et al. 2014

Heat Transfer Engineering

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It has been shown by the authors that car inclination influences the temperatures of different underhood components. Herethese effects are analyzed by heat-flux measurements. The results of underhood temperature and heat-flux measurements carried out on a passenger vehicle in wind-tunnel S4 of Saint-Cyr l'Ecole are presented. The underhood compartment of the vehicle is instrumented with 40 surface and air thermocouples and 20 flux meters of normal gradient. Experiments are performed with a specific technique for separate measurement of convective and radiative heat fluxes. Three car position configurations are tested: flat, uphill, and downhill positions. Measurements are made for three different thermal functioning modes. Fluxmetric analysis based on overall heat flux as well as on separate convective and radiative heat fluxes is reported here in order to establish the effects and variation tendencies of car inclination on the temperature-heat flux pair. For most of the tested positions in the underhood top region, the car inclination improves convective heat transfer and penalizes radiative heat transfer. The reduction in radiative heat transfer dominates the convective heat-transfer improvement, resulting in augmentation of the overall heat flux as well as the temperature.

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