| 摘要 |
<p>This document relates to a water heater for heating water stored in a vessel, comprising a heat pump for performing a thermodynamic cycle for providing heat from a refrigerant fluid to the water for heating of the water. The heat pump is arranged for circulating the refrigerant fluid through a plurality of heat exchanger units such as to cool the refrigerant fluid from a superheated gas state to a sub-cooled liquid state while providing heat to the water. A first heat exchanger pre-heats the water, and a second heat exchanger includes a refrigerant condenser. The water heater comprises water inlets for providing water to the heat exchanger units, at least one water outlet for returning water from the heat exchanger units to the vessel, and a plurality of pumps. The pumps a first pump for establishing a water flow through a first water conduit and a second pump for establishing a water flow through a second water conduit, for enabling independent regulation of the flow rate through said first and second water conduit for minimizing deviations in a temperature difference between the refrigerant fluid and the water in each of the first and second heat exchanger unit.</p> |
