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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Prediction Modeling of Automobile Dynamic Thermal Load

Get access (open in a dialog) DOI: 10.1615/IHTC15.acr.009310
pages 963-975

Abstract

Currently automobile air-conditioning (AC) thermal load is mostly undertaken by steady state method to calculate the peak load instead of dynamic load, and carried out by manual calculation. Novel modeling method is presented considering the automotive geometric and thermodynamic characteristics and properties, driving conditions including velocity, orientation, number of people, automotive air-conditioner operating modes, geographical location data, range of time etc. are comprehensively evaluated. Thermal Response Factor (TRF) method is applied to calculate the conductive heat transfer processing in envelop of automobile, which can compute the cooling load and heat load different from heat gain more exactly, and can individually analyze the effects of environmental excitation and the material properties in the automobile respectively, so that a higher accuracy could be obtained. Based on the calculation method conducted, American National Standards Institute for the C programming language(ANSI C) was used to program for calculating the TRFs of envelope structure, which showed apparent advantages in processing heavy workload and cumbersome steps in TRFs' calculation. Verification test indicates that the calculation result solved by the software based on the method put in the paper meets the expectation. Calculation results show that in the cloudy day in Guangzhou and automobile's velocity at 90 km/h condition, thermal loads of convection through the envelop structures accounts for about 27% of the total load, while thermal loads caused by radiation through glassed and cabin body wall, by passengers, by other factors account for 33%, 7%, 33% of the total load respectively.