PURPOSE: A heat pump system for supplying seawater and heat source to a fish farm is provided to improve system efficiency by heating seawater through a heat exchanger. CONSTITUTION: A heat pump system for supplying seawater and heat source to a fish farm comprises a compressor (10) for converting a refrigerant into a high temperature and pressure refrigerant, a 3-way valve (20) which is installed at the outlet of the compressor and selectively transfers the high temperature and pressure refrigerant of the compressor according to a fixed temperature within a water tank, a 4-way valve (30) which connects to the 3-way valve and devices and selectively transfers the refrigerant transferred through 3-way valve to the devices, a first heat exchanger (40) which connects to the 4-way valve and heats seawater, an expansion valve (50) which connects to the first heat exchanger and expands a heat-exchanged refrigerant, a second heat exchanger (60) evaporates the refrigerant by heat-exchange between the expanded refrigerant and external seawater, and a hot water heat exchanger (70) which connects to the 3-way valve and heats fresh water.본 발명은 양식장용 해수 열원 히트펌프 시스템에 관한 것으로서, 더욱 상세하게는 3-WAY 밸브를 통해 압축기의 고온,고압 냉매가 선택적으로 고온수용 열교환기에 전달되고, 상기 고온수용 열교환기에 의해 담수와 열교환시킴으로써, 양식장의 양식 수조 내 해수의 온도가 설정온도 이하일 때, 가열된 담수가 양식 수조 내에 설치된 열교환장치를 통해 해수를 가열시켜 양식과정에서 필요한 설정온도조건을 충족시킬 수 있어 해수 열원 히트펌프 시스템의 효율이 증가하는 특징이 있다.
