OPERATION METHOD OF HEAT SOURCE SYSTEM FOR ENVIRONMENTAL TESTING ROOM

摘要

PURPOSE: To provide a good control quality from a low temperature region to a high temperature region, and to facilitate maintenance and management. ;CONSTITUTION: As cooling is carried out by a direct expansion coil 10 in a low temperature region and by a water cooled coil 11 in medium and high temperature regions, it is possible to obtain a good control quality over the entire temperature region. Also, maintenance and management are made easy since any brine is not used. Also, when in a high temperature cycle operation and in a low outside air condition, the water cooled coil 11 can be cooled by a cooling tower 7 without the use of a refrigerating machine 6, so that it is possible to conduct energy-saving operation. Furthermore, moisture contained in the taken outside air can be beforehand removed by an external air conditioner 9 which uses the direct expansion coil 10, so that it is not necessary to add to a system a dehumidifying machine which is difficult in maintenance and high in cost. Furthermore, cooling water in the water cooled coil 11 can be readily and completely removed, so that even when a low temperature cycle operation is performed by means of the direct expansion coil 10, it is not necessary to investigate freezing of the cooling water in the water cooled coil 11.;COPYRIGHT: (C)1994,JPO