| 摘要 |
The invention relates to a heat pump-based heating system (1) comprising a working medium (2) that flows through an evaporator (3), a compressor (4), a condenser (17a, 17b; 17), and an expansion valve (5) in a closed cycle, as well as a liquid (6) that is conducted within a closed cycle, flowing through a storage heater (7). The condenser (17a, 17b; 17) transfers energy from the working medium (2) to the liquid (6), and the liquid (6) forms a thermal stratification in the gravitational direction inside the storage heater (7). The heating system (1) further comprises a hot water heating device including a first heat exchanger (8) which transfers heat from the liquid (6) to water (9a), thus providing hot water (10). The invention is characterized in that the hot water heating device additionally includes a second heat exchanger (17c) that is mounted upstream of the first heat exchanger (8) relative to the water to be heated and is used for preheating the cold water (9) which is then fed to the first heat exchanger (8) as preheated cold water (9a). The working medium (2) flows through the primary side of the second heat exchanger (17c), while cold water (9) from the mains system flows through the secondary side thereof, then flows through the secondary side of the first heat exchanger (8) in order to be further heated, and is available as hot water (10) after flowing through the first heat exchanger (8). The second heat exchanger (17c) is arranged between the condenser and the expansion valve (5) relative to the working medium (2) such that previously condensed, liquid working medium (2) flows through the second heat exchanger (17c). The second heat exchanger (17c) transfers heat from the liquid working medium (2) to the cold water (9) such that the working medium (2) cools down while heating the cold water (9). |
