Abstract: A heat pump circuit including a compressor that compresses a working fluid from a gas in a low pressure, low temperature first state to a high pressure, a high temperature second state. A first subflow of the working fluid is condensed into a gaseous/liquid mixture and assumes a third state by the working fluid delivering heat to a first medium. The first subflow of the working fluid is expanded and returns to a gas in the first state by absorbing heat from a second medium, whereupon the working fluid completes the cycle again. A second subflow of the compressed working fluid is expanded from the second state and the energy contents in the second subflow converted into electrical energy, whereafter the expanded working fluid is returned to the compressor after passage of the evaporator, or after expansion in the energy converter from the second to the first state.