Method for recuperation of thermal energy from a motorized heat pump

Abstract

Method of recovering thermal energy from a motorized heat pump ( 1 ) comprising a step of: removal of the heat in the condenser ( 4 ), removal of the heat in the engine recuperator ( 11 ), removal of the heat in the exhaust recuperator ( 17 ), restoration of the heat removed in a heat restorer ( 21 ) that the heat transfer loop ( 18 ) passes through, the method being capable of: determining the power of the combustion in the heat engine ( 7 ), determining the refrigeration power available in the evaporator ( 3 ), modulating the speed of rotation of the heat engine ( 7 ) such that the refrigeration power is numerically superior to the combustion power.

1 . A method of recovering thermal energy from a motorized heat pump equipped with a heat pump in which a refrigerant circulates, the motorized heat pump comprising:
 an evaporator connected to a heat source,   a condenser connected to a cold source,   a compressor,   an expansion valve,   a heat engine mechanically coupled to the compressor in order to drive it, the heat engine comprising an outlet of the exhaust gases produced by the combustion,   a cooling system for the heat engine, comprising a heat exchanger called engine recuperator,   a recuperator of heat from the exhaust gases, called exhaust recuperator, the motorized heat pump defining at least one heat transfer loop in which a heat transfer fluid circulates intended to remove the heat from the condenser, from the heat engine and from the exhaust gases, wherein the condenser, the engine recuperator and the exhaust recuperator are placed in series, the heat transfer loop passing through the condenser, the engine recuperator and the exhaust recuperator, the method comprising the following steps:   removal of the heat in the condenser,   removal of the heat in the engine recuperator,   removal of the heat in the exhaust recuperator,   restoration of the heat removed in a heat restorer that the heat transfer loop passes through,   
       and the motorized heat pump comprising a control unit equipped with a computerized program arranged to:
 determine the power of the combustion in the heat engine, 
 determine the refrigeration power available in the evaporator, 
 modulate the speed of rotation of the heat engine such that the refrigeration power is numerically superior to the combustion power. 
 
     
     
         2 . The method according to  claim 1 , comprising the control of the speed of the heat engine such that the combustion power can be modulated between 30% and 100% of the maximum available combustion power. 
     
     
         3 . The method according to  claim 1 , wherein the combustion power is calculated as a function of the quantity of fuel injected and of the inferior or superior calorific value of the fuel. 
     
     
         4 . The method according to  claim 1 , comprising an:
 operation of measuring the temperature of the refrigerant of the heat pump upstream from the evaporator by means of a temperature sensor positioned upstream from the evaporator,   operation of measuring the pressure of the refrigerant of the heat pump upstream from the evaporator by means of a pressure sensor positioned upstream from the evaporator.   
     
     
         5 . The method according  claim 4 , wherein the method comprises an:
 operation of measuring the temperature of the refrigerant of the heat pump downstream from the evaporator by means of a temperature sensor positioned downstream from the evaporator, operation of measuring the pressure of the refrigerant of the heat pump downstream from the evaporator by means of a pressure sensor positioned downstream from the evaporator.   
     
     
         6 . The method according to  claim 5 , comprising an operation of determining the enthalpy upstream and downstream of the evaporator of the refrigerant from data tables for a given refrigerant as a function of the measured pressures and temperatures. 
     
     
         7 . The method according to  claim 6 , comprising an operation of calculating the refrigeration power in the evaporator as the product of the mass flow of the refrigerant times the difference in enthalpy of the refrigerant between the upstream and downstream of the evaporator. 
     
     
         8 . A motorized heat pump equipped with a heat pump in which a refrigerant circulates, comprising:
 an evaporator connected to a heat source,   a condenser connected to a cold source,   a compressor,   an expansion valve,   a heat engine mechanically coupled to the compressor in order to drive it, the heat engine comprising an outlet of the exhaust gases produced by the combustion,   a cooling system for the heat engine, comprising a heat exchanger called engine recuperator,   a recuperator of heat from the exhaust gases, called exhaust recuperator, the motorized heat pump defining at least one heat transfer loopin which a heat transfer fluid circulates intended to remove the heat from the condenser, from the engine and from the exhaust gases, wherein the condenser, the engine recuperator and the exhaust recuperator are placed in series, the heat transfer loop passing through the condenser, the engine recuperator and the exhaust recuperator, and the motorized heat pump comprises a control unit equipped with a computerized program arranged to execute the method according to  claim 1 .   
     
     
         9 . The motorized heat pump according to  claim 8 , comprising:
 a temperature sensor,   a pressure sensor, and   a flow rate sensor,   
       the computerized program being arranged to execute the following method:
 removal of heat in the condenser, 
 removal of heat in the engine recuperator, 
 removal of heat in the exhaust recuperator, 
 restoration of the heat removed in a heat restorer that the heat transfer loop passes through, 
 determination of a power of the combustion in the heat engine, 
 determination of a refrigeration power available in the evaporator, 
 modulation of a speed of rotation of the heat engine such that the refrigeration power is numerically superior to the combustion power. 
 
     
     
         10 . A utilization of a motorized heat pump according to  claim 8 , wherein the motorized heat pump exploits the energy from waste waters from industries or gray waters from housing to heat a heat transfer fluid in a recycling circuit.