Abstract
C로 증가할수록 냉방용량은 19.1 kW에서 20.5 kW로 7.3% 증가했으나 냉방성능(COP)는 4.67에서 5.1로 7.0%감소하였다. Abstract: The objective of this study is to investigate the cooling performance of an air-conditioning system for a special purpose vehicle under tropical and severe weather conditions. In order to evaluate and compare the cooling performances, the dual refrigeration cycle using R-134a was tested on a special purpose vehicle with various refrigerant charge amounts and indoor temperatures. The cycle was tested considering indoor cooling speed and compression ratio (discharge pressure), and was optimized at the refrigerant charge amount of 1.5 kg and outdoor temperature of 40.0 °C. The time to reach indoor temperature of 15.0 °C increased by 86.5％ and 38.1％, at the indoor temperatures from 25.0 °C to 32.5 °C and from 32.5 °C to 40.0 °C, respectively. In addition, with the increase in indoor temperature from 25.0 °C to 40.0 °C, the cooling capacity increased by 7.3％, from 19.1 kW to 20.5 kW, but decreased by 7.0％ from 4.67 to 5.1.
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