Plant for producing sanitary hot water

Abstract

The invention relates to a plant for producing sanitary hot water, that comprises a water heater including a tank ( 1 ) containing a fluid to be heated, and a controlled mechanical ventilation system ( 2 ) for extracting air from a dwelling, the controlled mechanical ventilation system ( 2 ) being coupled to a thermodynamic circuit ( 3 ) in which flows a coolant fluid, the thermodynamic circuit ( 3 ) including an evaporator ( 4 ) for exchanging heat with the extracted air, a compressor ( 6 ), an expander ( 8 ) and a condenser ( 7 ) for exchanging heat with the fluid contained in the tank ( 1 ). The ventilation system is equipped with a means for adjusting the flow of extracted air, e.g. based on hygrometry. The compressor ( 6 ) is a variable speed compressor capable of modifying the flow of the coolant fluid.

1 . Plant for producing sanitary hot water including:
 a water heater comprising a tank within which is stored fluid to be heated, and   a controlled mechanical ventilation system intended for extracting air from a dwelling, the controlled mechanical ventilation system being coupled to a thermodynamic circuit within which flows a coolant fluid, the thermodynamic circuit including an evaporator for exchanging heat with extracted air, a compressor, an expander, and a condenser for exchanging heat with fluid contained in the tank,   wherein the ventilation system is equipped with means for adjusting the extracted airflow based on hygrometry, and wherein the compressor is a variable speed compressor, capable of modifying a flow of coolant fluid.   
     
     
         2 . Plant according to  claim 1 , further comprising means providing information on the extracted airflow interacting with the compressor so as to adjust a flow of coolant fluid in the corresponding circuit based on a measured airflow. 
     
     
         3 . Plant according to  claim 2 , further comprising at least one temperature probe of the extracted air, located downstream of the evaporator in a direction of the airflow, and interacting with the compressor so as to adjust a flow of coolant fluid in the corresponding circuit based on temperature of the measured air. 
     
     
         4 . Plant according to  claim 3 , further comprising at least one temperature probe, capable of measuring temperature of the fluid contained in the tank of the water heater, interacting with the compressor so as to adjust a flow of the coolant fluid in the corresponding circuit, based on temperature of the measured fluid. 
     
     
         5 . Plant according to  claim 4 , further comprising a plurality of temperature probes located at different levels of the tank so as to measure temperature of a plurality of layers of the fluid contained in tank. 
     
     
         6 . Plant according to  claim 4 , wherein the means for providing information on the extracted airflow, the temperature probe of the extracted air and/or the temperature probe of the fluid are connected to a central control unit designed to adjust a speed of the compressor based on the measured airflow, the temperature of the measured air and/or the temperature of the measured fluid. 
     
     
         7 . Plant according to  claim 1  wherein the condenser is located inside the tank of the water heater, so as to exchange heat directly with the fluid contained in the tank. 
     
     
         8 . Plant according to  claim 1 , further comprising a secondary circuit of heat exchange inside of which flows a coolant fluid, passing through the condenser so as to exchange heat with the coolant fluid, the secondary circuit further including a heat exchanger located inside the tank of the water heater, so as to exchange heat with the fluid contained in the tank. 
     
     
         9 . Plant according to  claim 8 , wherein the heat exchanger of the secondary circuit is a coil. 
     
     
         10 . Plant according to  claim 1 , wherein the controlled mechanical ventilation system includes at least an air vent intended for passage of extracted air, the means for adjusting the extracted airflow including means for adjusting an opening of the air vent. 
     
     
         11 . Plant according to  claim 1 , wherein the controlled mechanical ventilation system includes at least one first air vent intended for passage of extracted air, means for adjusting the extracted airflow including at least a second air vent and control means designed to control opening and closing of the second air vent.