System and a method of energy recovery from low temperature sources of heat

Abstract

A system of energy recovery from low temperature sources of heat, comprising components of Organic Renkine Cycle (ORC) including a turbine from which an ORC vapor is withdrawn, a condenser in which the ORC vapor withdrawn from the turbine condenses into an ORC condensate, a pump which circulates the ORC working medium, a heat exchanger which is supplied with a heat carrier from a lower temperature heat source and in which the ORC working liquid, and an ARC Condenser in which the ORC working liquid is heated or evaporates to produce ORC working vapor which is supplied to the turbine; components of an absorption refrigeration cycle (ARC) including an absorption refrigeration machine which receives heat and vaporizes a liquid refrigerant of the ARC to produce an ARC refrigerant vapor which is supplied to the ARC condenser to heat the ORC working liquid; and an additional component increasing a temperature difference between the ORC condensate and the heat carrier from the low temperature heat source.

1 . A system of energy recovery from low temperature sources of heat, including components of Organic Renkine Cycle (ORC) comprising:
 ORC working medium,   a turbine from which a vapor of an ORC working medium is withdrawn,   a condenser in which the ORC vapor withdrawn from the turbine condenses into a condensate, which is also an ORC working liquid,   a pump which circulates the working liquid,   a heat recovery heat exchanger which is supplied with a heat carrier from a low temperature heat source and in which the ORC working liquid is heated,   an a ARC condenser in which the ORC working liquid is heated or evaporates to produce the ORC working vapor which is supplied to the turbine,   an additional optional ORC evaporator to generate an ORC working vapor which is supplied with a heat carrier from a high temperature heat source,   and   including components of Absorption Refrigeration Cycle (ARC) comprising   ARC refrigerant,   an absorption refrigeration machine which receives heat and vaporizes an ARC refrigerant to produce an ARC refrigerant   an ARC condenser to heat the ORC working liquid,   an expansion valve provides an adiabatic expansion of the ARC refrigerant liquid passing from an ARC refrigerant condenser to an ARC refrigerant evaporator   and   an additional component, which may be a heat exchanager, increasing a temperature difference between the ORC condensate and the heat carrier from the low temperature heat source.   
     
     
         2 . A system of energy recovery as defined in  claim 1 ; further comprising an additional heat source which supplies heat to the absorpotion refrigeration machine to vaporize ARC refrigerant. 
     
     
         3 . A system of energy recovery as defined in  claim 1 ; further comprising a pump circulating an ORC working medium 
     
     
         4 . A system of energy recovery as defined in  claim 1 ; further comprising an ORC regenerator connecting said additional component with said ARC condenser, in which the ORC working liquid is further heated by the condensing ARC vapor. 
     
     
         5 . A system of energy recovery as defined in  claim 1 ; further comprising an ORC evaporator which is connected with said ARC condenser and said turbine to evaporate the ORC working liquid coming from said ARC condenser. 
     
     
         6 . A system of energy recovery as defined in  claim 1 , wherein said turbine is connected with said absorption refrigeration machine so that the working vapor of the ORC working medium withdrawn from said turbine heatS and vaporizes the the ARC refrigerant in the absorption refrigeration machine. 
     
     
         7 . A method of energy recovery from low temperarture sources of heat, comprising the step of:
 in an Organic Renkine Cycle (ORC) withdrawing from a turbine an ORC working vapor into a condenser condensing the ORC working vapor withdrawn from the turbine into a condensate which is ORC working liquid, pumping the ORC working medium, in a heat recovery heat exchanger supplying a heat carrier from a lower temperature heat source and heating the ORC working liquid, and in an ARC Condenser heating the ORC working liquid or evaporating it to produce ORC working vapor which is supplied to the turbine;   in an absorption refrigeration cycle (ARC) in an absorption refrigeration machine receiving heat and vaporizing an ARC refrigerant to produce an ARC refrigerant vapor which is supplied to the ARC condenser heating the ORC working liquid and   increasing a temperature difference between the ORC condensate and the heat carrier from the low temperature heat source in an additional component.   
     
     
         8 . A method of energy recovery as defined in  claim 1 ; further comprising supplying heat from an additional heat source to the absorption refrigeration machine to vaporize the ARC refrigerant. 
     
     
         9 . A method of energy recovery as defined in  claim 1 ; further comprising in an ORC regenerator connecting said additional component with said ARC condenser which is further heating the ORC working liquid by the ARC condesing vapor. 
     
     
         10 . A method of energy recovery as defined in  claim 1 ; further comprising in an evaporator which is connected with said ARC condenser and said turbine, evaporating the ORC working liquid coming from said ARC condenser. 
     
     
         11 . A method of energy recovery as defined in  claim 1 , further comprising connecting said turbine with said absorption refrigeration machine so that the working vapor of the ORC working medium withdrawn from said turbine heats and vaporizes the ARC refrigerant in the absorption refrigeration machine.