Numerical analysis and experimental study on the performance optimization of cold storage heat exchanger integrated with evaporator

  • Daewoong Lee


The ISG (Idle Stop and Go) systems are commonly used in modern automobiles because they are economical and environmental friendly technology. However, when a vehicle stops, the air-conditioning system stops, resulting in thermal discomfort to passengers in the cabin. This paper examines a cold storage heat-exchanger (CSH) integrated with an evaporator. The position of the cold storage parts inside a heat exchanger was analyzed through numerical simulations using FLUENT to create an adequate design for a CSH. The CSH performance was then examined with various airflow volumes and optimized experimentally in terms of the refrigerant flow circuit and fin density in the heat exchanger. Next, an experiment on the coldness release performance of the CSH was conducted in the air-conditioning system. The cold storage system with optimized CSH experiment resulted in lower air discharge temperatures (3.5 °C ~ 4.9 °C) than current air-conditioning systems, and delayed the warm-up by approximately 155 seconds to reach 18 °C temperature of air discharge. For this study, the CSH is an effective solution for the ISG-applied vehicles with less investment by transforming current air-conditioners’ structures more effectively.

Key words

Cold storage heat exchanger Cold storage Coldness release Evaporator Fuel economy ISG Latent heat Numerical simulation Phase change material Thermal comfort 



depth (mm)


height (mm)


length (mm)

air flow volume rate (m3/h)


air pressure drop (Pa)


refrigerant pressure drop (kPa)


cooling capacity (kW)


time (s)


temperature (°C)


velocity (m/s)


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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.R&D DivisionHalla-Visteon Climate Control Corp.DaejeonKorea

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