Patent ID: 7523621

Claim:
A system for heat refinement through utilization of waste heat or other heat sources, or district cooling, for alternation between production of cold and/or heat refinement and/or mechanical energy and/or electrical production, which system comprises: a first cycle ( 2 ) for circulation of a working fluid, an evaporator ( 4 ) in which the circulating working fluid is evaporated to gas by taking up heat in the evaporator from passing waste heat or the district cooling that is transported in a conduit ( 6 ) which then is cooled ( 7 ), a compressor ( 8 ) that compress the gas, a condenser ( 10 ) that condenses the gas to a condensate and releases heat to a passing heat carrier in the condenser, and an expansion valve ( 14 ) that expands the condensate and bring back the working fluid to the evaporator ( 4 ); a second cycle ( 16 ; 16 a - d ), that is in connection with the first cycle ( 2 ), for circulation of the working fluid, which second cycle ( 16 ; 16 a - d ) is attached to the first cycle ( 2 ), an expansion apparatus, such as a turbine ( 18 ), attached to the second cycle ( 16 ; 16 a - d ) which turbine ( 18 ) supplies gas from the evaporator ( 4 ), whereby an expansion occurs, whereafter the working fluid is lead to evaporator ( 4 ), alternatively via a second condenser ( 22 ) connected to the second cycle ( 16 ) that condensates the gas from the turbine ( 18 ), whereafter condensate is brought back to the evaporator ( 4 ); and a fourth partial cycle ( 16 d ) of the second cycle ( 16 ) is connected, via a second switch valve ( 40 ), at electrical production where condenser ( 10 ) is utilized as an evaporator ( 10 ′) and evaporator ( 4 ) is utilized as condenser ( 4 ′), further is a condensate pump ( 38 ) arranged in the fourth partial cycle ( 16 d ) between the condenser ( 4 ′) and the second switch valve ( 40 ), to pump the condensate from the condenser ( 4 ′) to the evaporator ( 10 ′).