年間冷房型パッケージ空調機の効率向上に関する研究 : 許容最低圧縮比と膨張弁容量の影響〔熱工学, 内燃機関, 動力など〕

概要

論文の詳細を見る
This paper reports on a method for designing a compressor and an expansion valve of packaged air conditioners for year-round cooling. The air conditioners can operate at high efficiency when the outdoor air temperature is low by lowering the condensation pressure. In this case, the expansion valve capacity must be increased and the compression ratio must be decreased. However, since increasing the expansion valve capacity and decreasing the compression ratio cannot be done without limitation, an appropriate expansion valve and compressor must be designed taking into account the following three types of conditions : 1) operating conditions ; 2) installation conditions ; and 3) climatic conditions. The simulation results reveal that performance can be sufficiently improved by setting the minimum allowed compression ratio to 1.4 and the expansion valve capacity to twice the standard size, when operating the air conditioners in Tokyo with a tube length of 30 meters
一般社団法人日本機械学会の論文
1998-06-25