Thermal Connection Of A Geothermal Source To A District Heating Network

Abstract

A method and system for providing heat for a district heating supply are provided. Heat at a first temperature level is provided by a thermal water conveying system from a geothermal source. By operating a high-temperature heat pump and thermally connecting the same to the geothermal source, the thermal water can be conducted through the evaporator of the high-temperature heat pump and the heat thereof can be transferred to the evaporator of the high-temperature heat pump. The condenser of the high-temperature heat pump then supplies heat at a second, higher temperature level to the district heating network. A high-temperature compression heat pump may be used as the high-temperature heat pump. The second, higher temperature level achieved in this manner may be above 100° C.

What is claimed is: 
     
         1 . A method for providing heat a district heating supply, comprising:
 extracting thermal water from a geothermal source,   operating a high-temperature heat pump,   thermally connecting the geothermal source to the high-temperature heat pump,   conducting the thermal water through a heat exchanger which transmits heat to a heat transporting medium, thereby providing a heated heat transporting medium,   passing a first flow of the heated heat transporting medium to an evaporator of the high-temperature heat pump,   thermally transmitting heat at a first temperature level from the heated heat transporting medium passed to the evaporator of the high-temperature heat pump,   passing a second flow of the heated heat transporting medium to a condenser of the high-temperature heat pump, and   thermally transmitting heat at a second temperature level higher than the first temperature level and at least 100° C. via the condenser to the second flow of heated heat transporting medium passed to the condenser.   
     
     
         2 . The method of  claim 1 , wherein a high-temperature compression heat pump is used as the high-temperature heat pump. 
     
     
         3 . The method of  claim 1 , wherein the second temperature level is at least 110° C. 
     
     
         4 . The method of  claim 1 , wherein a working medium comprising a fluoroketone is used in the high-temperature heat pump. 
     
     
         5 . The method of  claim 1 , wherein a non-toxic working medium is used in the high-temperature heat pump. 
     
     
         6 . The method of  claim 1 , wherein a working medium having a critical temperature above 160° C. is used in the high-temperature heat pump. 
     
     
         7 . The method of  claim 1 , comprising storing the heat of the first temperature level received from the heated heat transporting medium or the heat of the second temperature level received via the condenser of the high-temperature heat pump in at least one thermal store. 
     
     
         8 . The method of  claim 1 , wherein comprising operating at least two high-temperature heat pumps coupled in series. 
     
     
         9 . A system for providing heat for a district heating network at a temperature level of at least 100° C., the system comprising:
 at least one thermal water extraction device configured to extract thermal water, 
 a high-temperature heat pump comprising an evaporator and a condenser, 
 a heat exchanger configured to transmit heat from the extracted thermal water to a heat transporting medium to thereby provide a heated heat transporting medium, 
 a thermal water transporting line configured to pass the extracted thermal water to the heat exchanger, and 
 a first supply line configured to conducting the heated heat transporting medium from the heat exchanger to the evaporator of the high-temperature heat pump, and 
 a second supply line configured to conducting the heated heat transporting medium from the heat exchanger to the condenser of the high-temperature heat pump. 
 wherein the condenser provides heat to a flow of the heated heat transporting medium passed to the condenser via the second supply line. 
 
     
     
         10 . The system of  claim 9 , wherein the high-temperature heat pump comprises a high-temperature compression heat pump. 
     
     
         11 . The system of  claim 9 , wherein the high-temperature heat pump contains a working medium comprising a fluoroketone. 
     
     
         12 . The system of claim, wherein the high-temperature heat pump contains a working medium having a critical temperature above 160° C. 
     
     
         13 . The system of  claim 9 , comprising at least one thermal store configured to receive and store heat of a first temperature level from the heated heat transporting medium or heat of a second temperature level, higher than the first temperature level, from the condenser of the high-temperature heat pump. 
     
     
         14 . The system of  claim 9 , comprising at least two high-temperature heat pumps connected in series.