| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress degradation of energy efficiency even when cooling load is changed. <P>SOLUTION: A heat source-side circuit (2) includes an intermediate-stage refrigerator (23), a low-stage refrigerator (33), a high-stage inlet pipe (2b) communicated with high-stage cold water of PG tanks (41, 42), and a low-stage outlet pipe (2e) communicated with low-stage cold water of the PG tanks (41, 42). The heat source-side circuit (2) is provided with first and second intermediate-stage opening/closing valves (24, 26) and first and second low-stage opening/closing valves (34, 36) to switch a flow channel of cooling water to a state wherein the refrigerators (23, 33) are connected in series to each other, and a state wherein the plurality of refrigerators (23, 33) are connected in parallel with each other, between the high-stage inlet pipe (2b) and the low-stage outlet pipe (2e). <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
