System and method for heating water

Abstract

A system for heating water includes a circuit ( 2 ) in which an operating fluid circulates; the circuit ( 2 ) having a means ( 20 ) for heating the operating fluid. A first line ( 31 ) supplies water for sanitary use and a second line ( 32 ) supplies water intended for heating at least one environment of a building. A first heat exchange means ( 5 ) exchanges heat between the circuit ( 2 ) and the first supply line ( 31 ) and second heat exchange means ( 4 ) exchanges heat between the circuit ( 2 ) and the second supply line ( 32 ). The heating means ( 20 ) has or is a piston pump ( 21 ).

1 . A system for heating water comprising:
 a circuit in which an operating fluid circulates; said circuit comprising a means for heating the operating fluid and being deprived of evaporator,   a first line for supplying water for sanitary use,   a second line for supplying water intended for heating at least one environment of a building,   first heat exchange means for exchanging heat between the circuit and the first supply line; and   second heat exchange means for exchanging heat between the circuit and the second supply line;   wherein the means for heating the operating fluid comprises a piston pump.   
     
     
         2 . The system according to  claim 1 , wherein said system comprises an electric motor for driving the piston pump; said electric motor comprising/being an asynchronous magnetic electric motor. 
     
     
         3 . The system according to  claim 1 , wherein the operating fluid is R1233ZD(E). 
     
     
         4 . The system according to  claim 1 , wherein said first heat exchange means comprises:
 a path which is closed on itself, in which a heat transfer fluid circulates,   a first heat exchanger which puts the operating fluid circulating in the circuit and the heat transfer fluid circulating in said path in thermal communication, and   a heat exchange tank in thermal communication with said first supply line.   
     
     
         5 . The system according to  claim 4 , wherein said first supply line of water for sanitary use comprises a coil which transits inside the tank. 
     
     
         6 . The system according to  claim 5 , wherein said system comprises an additional heat exchanger for exchanging heat between the circuit and the first supply line. 
     
     
         7 . The system according to  claim 6 , wherein said system comprises a throttling valve interposed between said first heat exchanger and said additional heat exchanger. 
     
     
         8 . The system according  claim 1 , wherein said system further comprises a control unit for regulating the temperatures and pressure required to keep in a liquid phase the operating fluid circulating in circuit. 
     
     
         9 . A method for heating water involving the system according to  claim 1  comprising the following steps:
 circulating an operating fluid in a circuit, 
 heating the operating fluid circulating in said circuit, 
 performing a transmission of heat from the operating fluid to water for sanitary use; said water for sanitary use moving along a first supply line, and 
 performing a transmission of heat from the operating fluid to water for heating at least one environment of a building; said water for heating moving along a second supply line. 
 
     
     
         10 . The method according to  claim 9 , wherein the operating fluid has a pressure between 6 and 8 bar.