| 摘要 |
PURPOSE: A heat pump system using a binary refrigerating cycle is provided to improve energy efficiency by respectively installing an auxiliary heat exchanger in a first stage heat pump system and a second stage heat pump system and to reduce peak load by producing cold water in summer season. CONSTITUTION: A heat pump system using a binary refrigerating cycle comprises a first stage heat pump and a second stage heat pump. A circulating line of a reservoir tank(70) is heat-exchanged with a first stage condenser(20a) or circulates hot water heated by heat-exchanging with a second stage condenser(20b) to the reservoir tank. When the outdoor temperature is over a predetermined temperature in spring, autumn, and winder, the first stage heat pump is independently operated. When the outdoor temperature is less than the predetermined temperature, the first and second stage heat pumps are simultaneously operated to generate hot water.
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