Abstract
A vaccine storage employing a compact refrigeration module for remote area use was proposed and realized in laboratory setting. The module was based on a passenger car air-conditioner driven by a biodiesel powered small engine. The engine used was of single-cylinder, direct-injection, and compression-ignited type with swept volume of about 0.30 dm3 and compression ratio of 20:1. The biodiesel powered engine was tested to drive the air-conditioning system at normal operation over various speeds and loads. The refrigeration module was found to operate well with low specific fuel consumption at optimal speed ratio between the engine and the compressor. At this setting, the engine thermal efficiency was 28% and the refrigeration COP was about 1.8. With regards to energy saving, the modular system appeared to offer a satisfactory outcome, in which the vaccine storage was able to maintain the temperature below 8 °C for about 4.5 h after the engine stop.
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