Abstract

This experimental study investigates the cooling method for temporary negative pressure isolation rooms using portable HEPA filter units as a preparatory measure for the shortage of airborne infection isolation rooms. The indirect air-conditioning using transfer air (IAC-TA) method is a method of cooling the hallway and introducing cooled air into the room without using its air-conditioning system, thereby preventing cross-contamination of equipment. The experiments were conducted in a full-scale simulated chamber. Through these experiments, we confirmed that the IAC-TA method is more effective when the airtightness of the room is increased, sufficient make-up air is supplied, and an appropriate door gap is maintained. However, considering the differential pressure value to maintain the room at negative pressure, the amount of cooled air induced through the door gap is limited. Therefore, the IAC-TA method is expected to be effective in spaces where cool-down has been completed to some extent or where the cooling loads are relatively low.