Heating group

Abstract

A domestic water heating group includes a heat source; storage tank. A heat exchanger includes inlet and outlet sections, the the inlet and outlet being in fluid communication with: a water supply system, a water usage system and the tank. The water is heated to, towards the tank, a storage temperature TAC and/or towards the usage system at a supply temperature TER, mixer group is upstream of the inlet of the exchanger group and has first and second inlet ports connected to the supply system, tank, exchanger group The mixer receives the domestic water, at a low temperature TIN, the heated domestic water at the second inlet port, and mixes the water thus received and provides at the outlet port, in fluid connection with the exchanger group, the mixed domestic water having an intermediate temperature TINT included between the temperature TIN and the temperature TAC.

1 . Domestic water heating group comprising:
 at least one heat source;   at least one storage tank, configured for containing said domestic water heated by means of said at least one heat source, said at least one storage tank having at least one inlet mouth and at least one tubular inlet duct, in fluid connection with each other and configured for receiving in inlet said heated domestic water, and at least one first outlet mouth and at least one tubular duct, in fluid connection with each other and configured for supplying said heated domestic water from said at least one storage tank;   at least one heat exchanger group, comprising at least one tubular duct having at least one inlet section and at least one outlet section, said at least one tubular ducts being in fluid communication with a water supply system for feeding said domestic water, with a usage water supply system as well as with said at least one storage tank by means of said at least one tubular duct and said inlet mouth, and being configured for receiving said domestic water to be heated in inlet from said water supply system, at said inlet section thereof, and for supplying said heated domestic water at the outlet at said outlet section thereof, towards said at least one storage tank at a storage temperature (TAC) and/or towards a usage water supply system at a supply temperature (TER), said at least one tubular duct being thermally coupled with said at least one heat source between said at least one inlet section thereof and said at least one outlet section thereof;   wherein it comprises   at least one mixer group for said domestic water, placed upstream of said at least one inlet section of said at least one tubular duct of said at least one exchanger group, said at least one mixer group having at least one first inlet port, at least one second inlet port and at least one outlet port respectively in fluid connection with said water supply system, with said at least one storage tank and with said at least one exchanger group, said at least one mixer group being configured for:   receiving said domestic water in inlet at low temperature (TIN) at said first inlet port, said domestic water coming from said water supply system,   receiving said heated domestic water in inlet at said second inlet port, said heated domestic water exiting from said at least one first outlet mouth of said at least one storage tank, and   mixing said domestic water thus received and providing at the outlet, at said outlet port, in fluid connection with said at least one inlet section of said at least one exchanger group, said domestic water thus mixed, having an intermediate temperature (TINT) comprised between the temperature (TIN) of said domestic water fed by said feeding water supply system and the temperature of said heated domestic water (TAC), supplied by said at least one storage tank.   
     
     
         2 . The heating group according to  claim 1 , wherein said intermediate temperature (TINT) is adjustable as a function of the power suppliable by said at least one heat source, of said supply temperature (TER) and of the flow rate that one wishes to obtain at the outlet towards said usage water supply system. 
     
     
         3 . The healing group according to  claim 1 , wherein said at least one mixer group is of hybrid electronic type. 
     
     
         4 . The heating group according to  claim 1 , wherein said at least one heat source is a heat pump, a gas burner or a condensation boiler. 
     
     
         5 . The heating group, according to  claim 1 , wherein said at least one storage tank comprises at least one second outlet mouth and at least one tubular duct, in fluid connection with each other and with said at least one storage tank and with said at least one exchanger group, upstream of said at least one heat source. 
     
     
         6 . The heating group according to  claim 5 , wherein said heat exchanger group comprises at least flow selector device, between said at least one tubular duct of said at least one storage tank and said tubular duct of said at least one exchanger group, in order to allow the introduction into said at least one exchanger group of said heated domestic water coming from said at least one storage tank or from said at least one mixer group, and at least one other flow selector device, between said tubular inlet duct of said at least one storage tank and said at least one tubular duct, at said outlet section of said at least one tubular duct, in order to allow the introduction of domestic hot water heated in said at least one storage tank and/or in said usage water supply system. 
     
     
         7 . The heating group, according to  claim 1 , wherein said at least one storage tank comprises at least one second inlet mouth and at least one tubular duct, in fluid connection with each other and configured for drawing, from a third outlet mouth, the domestic water fed by the water supply system, and for restoring the quantity of water drawn from the tank by means of the first outlet mouth. 
     
     
         8 . The heating group according to  claim 1 , comprising at least one control unit, operatively connected to said at least one heat source, said at least one storage tank, said at least one exchanger group and said at least one mixer group, said control unit being configured for controlling said mixer group in a manner such that, during use, it supplies domestic water at the outlet at an intermediate temperature (TINT) that depends on the power suppliable by said at least one heat source and on said supply temperature (TER) of the domestic water, that one wishes to supply downstream of said heating group, towards said usage water supply system. 
     
     
         9 . A method for heating domestic water by means of a heating group according to  claim 1 , comprising the following steps:
 mixing said domestic water, coming from a feeding water supply system, with heated domestic water, coming from a storage tank, until it is brought to an intermediate temperature (TINT) between the temperature (TIN) of said domestic water provided by said water supply system and the temperature (TAC) of said domestic water provided by said storage tank;   providing said domestic water at said intermediate temperature (TINT) to an exchanger group thermally coupled to a heat source, thus obtaining domestic water at a supply temperature (TER) for a usage water supply system;   wherein   said intermediate temperature is adjustable as a function of the maximum power that can be developed by said heat source, thermally coupled to said exchanger group, of said supply temperature (TER) and of the flow rate of said domestic water towards said usage water supply system  6 .   
     
     
         10 . A method for obtaining an improved heating group starting from a conventional heating group comprising: at least one heat source; at least one storage tank, configured for containing said domestic water heated by means of said at least one heat source, said at least one storage tank having at least one inlet mouth and at least one tubular inlet duct, in fluid connection with each other and configured for receiving in inlet said heated domestic water, and at least one first outlet mouth and at least one tubular duct, in fluid connection with each other and configured for supplying said heated domestic water from said at least one storage tank; and at least one heat exchanger group, comprising at least one tubular duct having at least one inlet section and at least one outlet section, thermally coupled to said at least one heat source between said at least one inlet section thereof and said at least one outlet section thereof, and being in fluid communication with a water supply system for feeding said domestic water, at said at least one inlet section thereof, with a usage water supply system, at said at least one outlet section thereof, and with said at least one storage tank, by means of said at least one inlet mouth and said at least one tubular inlet duct, said at least one heat exchanger group being configured for receiving in inlet, from said water supply system, said domestic water to be heated, and for supplying said heated domestic water at the outlet towards said at least one storage tank at a storage temperature (TAC) and/or towards said usage water supply system at a supply temperature (TER);
 said method comprising the step of installing at least one mixer group for said domestic water, upstream of said at least one inlet section of said at least one tubular duct of said at least one exchanger group, said at least one mixer group having at least one first inlet port, at least one second inlet port and at least one outlet port respectively in fluid connection with said water supply system, with said at least one storage tank and with said at least one exchanger group, in a manner such that said one mixer group, during use:   receives said domestic water in inlet at low temperature (TIN) at said first inlet port, said domestic water coming from said water supply system,   receives said heated domestic water in inlet at said second inlet port, said heated domestic water exiting from said at least one first outlet mouth of said at least one storage tank, and   mixes said domestic water thus received and provides at the outlet, at said outlet port, in fluid connection with said at least one inlet sectiones of said at least one exchanger group, said domestic water thus mixed, having an intermediate temperature (TINT) comprised between the temperature (TIN) of said domestic water fed by said water supply system and the temperature (TAC) of said heated domestic water, supplied by said at least one storage tank   and in a manner such that   said intermediate temperature (TINT) is adjustable as a function of the power suppliable by said heat source, of said supply temperature (TER) and of the flow rate that one wishes to provide for said usage water supply system.