FR2559571A1 - Fitting adjusting the heat distribution of a source heated by a fuel - Google Patents

Abstract

The invention is based on a domestic water accumulator heated by gas which must also serve to feed a heating installation. For this purpose, a quantity of heat is taken off from the volume of domestic water and transmitted to the heating installation by means of a heat exchanger. Moreover, a thermometric ambient temperature probe is provided, which separates the accumulator from the heating installation at the moment when a reference temperature is attained. By virtue of this cutoff, the contents of the accumulator may be heated more rapidly, which ensures the rapid preparation of domestic water.

Description

 The present invention relates to an arrangement regulating the distribution of heat from a source heated by a fuel, this arrangement comprising a heating circuit with a receiver as well as a sanitary water heater.

 So far, such sources have consisted of circulating water heaters or boilers, to which two circuits were connected, one of which served to supply a heating installation comprising a multitude of radiators or convectors mounted in parallel or in series, or an underfloor heating installation. The second heating circuit included a domestic water heater operating either as an instantaneous water heater or with an accumulator. It was possible to switch these two circuits using an appropriate device; this is how, for example, the drop in the temperature of the domestic water in the accumulator caused the boiler of the heating installation to switch to the water accumulator.

 In addition, as a regulating member of a circulating water heater, a room thermostat is known. To this end, the wall of one of the rooms heated by the heating circuit of the circulating water heater was fitted with a temperature probe measuring the effective interior temperature applied to a regulation system. Depending on the difference between this temperature and the setpoint of this system, the quantity of heat distributed to the radiators or to the heating installation was varied. The temperature regulation therefore worked, for all of the rooms to be heated, from a pilot room. With the help of normal valves or thermostatic valves, it was possible to cut or decrease this or that radiator of the heating circuit. The thermometric probe could be used both for starting and stopping the burner of the heater fe-eau that, moreover, at the control of the circulation pump of the heating circuit.

 For boilers or circulating water heaters heating a building by radiators fitted with thermostatic valves, it is also customary to adjust the supply temperature of the heating circuit according to the outside temperature. In this central regulation, the various thermostatic valves then intervene through their respective adjustment circuits to ensure the desired temperature in the room concerned.

 However, these conditions change radically when the heat source heated by a fuel is of the accumulator type. Thus, recently, it was established the possibility of providing a domestic water accumulator, heated with gas and used primarily for heating domestic water, as a heat source for a heating installation if the accumulated heat in domestic water can be transmitted, by means of a coil entering the interior of the accumulator, to a heating circuit.

The temperature of this heating circuit can therefore never be higher than that of the accumulated domestic water. This system has the general disadvantage that in the event of massive removal of heat by the heating circuit, the temperature of the domestic water drops appreciably. In addition, it has the drawback that when the building premises are heated by the heating circuit, these rooms, even after the set temperature has been reached, always receive heat, unnecessarily at the bottom. This operating mode prevents rapid heating of the domestic water, or in other words, causes the heating circuit to overheat and thereby waste fuel.

 The object of the present invention is therefore to produce an arrangement which makes it possible, if an accumulator is used as a heat source, both for the preparation of domestic water and for the supply of a heating circuit, optimal use of available energy.

 This object is achieved by the fact that the accumulator is provided directly for the preparation of sanitary water and connected, by a heat exchanger, to a heating circuit comprising a pump, and that at least one room heated by this circuit, is fitted with a temperature sensor which, when the room set temperature is reached, cuts the accumulator from the heating circuit.

 An advantageous improvement consists in that the heating circuit is supplied by a heat exchanger immersed in the volume of sanitary water of the accumulator, and that there are provided two solenoid valves ensuring the shutdown of the heating circuit, the one is directly in series with the heat exchanger and the other is arranged on a bypass parallel to the latter, and that the assembly is designed so that one of the two solenoid valves is always open and the other closed.

 Another improvement is given by the fact that the heat exchanger supplying the heating circuit is made as a coil wound directly on a smoke tube of the accumulator and thus being in close thermal contact with the outer wall of said smoke tube.

 Another improvement results from the fact that the heat exchanger coil is mounted only on the upper part of the smoke tube and opens, on the return side, in an area halfway up the accumulator.

 Another improvement is that the heat changer supplying the heating circuit is designed as a transfer station independent of the accumulator, and that the primary side of this station communicates directly with the water volume of the accumulator by supply and return lines comprising a pump, and the secondary side of the transfer station is connected to a heating receiver, by a supply and return line comprising a pump.

 Another improvement is achieved by the fact that the thermometric probe is placed in the room characterized by the greatest thermal reaction power among the rooms heated by the accumulator.

 An exemplary embodiment of the invention is the subject of the following description with Figures one to four of the drawing in support.

 Figures one to four show arrangements for a central heating installation with an accumulator as a heat source, and the respective adjustment and control members.

 In the four figures, the same references designate the same details.

 FIG. One relates to a water accumulator 3 heated by a burner 2 and which feeds, via a pipe 4, one or more receivers, not shown.

The accumulator is supplied with cold water via a pipe 5 coming from the distribution network. The accumulator has a cylindrical shape and has an outer wall 6 and an inner smoke tube 7 so as to form an annular space 8 serving as a reservoir closed at the bottom by a bottom 9 and at the top by a cover 10 pierced by the tube at smoke 7. The pipe 4 supplying the receivers ends in the highest part of the space 8, the cold water supply pipe 5, on the other hand, in the lowest part of this space.

In this part, the smoke tube 7 has a kind of cone-shaped combustion chamber opening towards the burner.

 In space 8, a heat exchanger coil 11 plunges onto which a return line 12 and a departure line are connected. The departure line 13 comprises an electrovalve 15 controlled by a magnet 14 and ends at a connection point. 16 from which the supply line 17 of the heating circuit starts, comprising a multitude of radiators or convectors 18 mounted in parallel and / or in series.

 From these radiators leaves the return pipe 20 of the heating circuit, provided with a circulation pump 19, and which terminates at a connection point 21 to which is connected a bypass 22 comprising another solenoid valve 23 with a magnet 24 and ending at connection point 16.

 At point 21 is also connected the return line 12 provided with a non-return valve 25 and which ends at the heat exchanger coil 11.

 The two magnets 14 and 24 of the solenoid valves 15 and 23 are connected respectively by a line 26 or 27 to the command and adjustment device 28 which comprises a setpoint generator 29 and is connected by a line 30 to a thermometric probe 31 which controls the temperature of a specific room, heated by a radiator 18 of the heating circuit 32. This circuit is made up of elements 16 to 23.

 It should also be mentioned that the accumulator 3 also has its own temperature regulating circuit.

Thus, inside its interior 8 is provided a thermometric probe 33 connected by a line 34 to a temperature regulator 35, equipped with a setpoint generator 36. The temperature regulator 35 comprises an adjustment member in the form of a a gas valve 37 placed on a gas line 38 supplying the burner 2. The flow section of the valve 37 can vary continuously or intermittently.

 With regard to the operation of the heating installation in FIG. One, it is assumed that the assembly is in the cold state. When it is switched on, the temperature probe 33 finds a significant difference in the temperature of the volume of water in the accumulator 3 compared to the setpoint. The burner 2 is started and the water in the accumulator 3 is heated. When the water temperature, controlled by the probe 33, approaches the setpoint set on the generator 36, the valve 37 is closed, and the heating of the accumulator 3 by the burner, finished At the moment when hot water is taken by opening a tap on the pipe 4, cold water arrives in the accumulator, the temperature drops, which again causes the water it contains to be heated.

 The heating circuit 32 is designed so that in the idle state, the solenoid valve 15 is closed, and the solenoid valve 23, open. When the heating circuit 32 requests the supply of heat because the temperature sensor 31 notices a difference in temperature with respect to the setpoint set on the generator 29, this results in a start-up order for the circulation pump 19 and an order switching for the two solenoid valves, emitted by the device 28. The solenoid valve 15 is open, and the solenoid valve 23, closed. The water in the heating circuit is then discharged through the heat exchanger coil 11, which causes the heating of the premises of the building.

The temperature sensor 31 is installed in the room which, thermally spoken, reacts the fastest.

 When the temperature of this room is equal to the set point, the solenoid valve is returned to the rest state, that is to say that at this time the heating circuit 32 is cut from the accumulator 3 who feeds it.

The consequence is that the contents of the accumulator can be reheated more quickly, the heating circuit not needing hot water, and is thus ready for the supply of domestic water, or the burner is stopped, the effective temperature of the accumulator having reached the setpoint.

 In the exemplary embodiment according to FIG. Two, the gas burner is replaced by an oil burner, and the two solenoid valves 15 and 23, by a 3-way distributor 40 operating in continuous variation. On the distributor 40 are connected on the one hand the bypass 22, on the other hand, the heat exchanger coil 11 via the line 13, and finally the line 17 which includes the pump 19. This distributor is equipped with a motor 41 which, via a line 42, is connected to the control and adjustment device 28. The heat exchanger coil 11 has undergone a modification in that it is wound directly on the smoke tube 7 and is thus in close thermal contact with this tube. This can be achieved by winding under prestress, or by soldering, with tin or not. If necessary, the complete surface of elements 6, 7, 9, 10 and 11, oriented inwards 8, can moreover be enameled.

 The burner 43 is a fuel oil burner with mechanical spraying, supplied by a line 44 coming from an oil tank.

 As for the operation of this exemplary embodiment, it hardly differs from that of FIG.

When the temperature of the pilot room increases, the control and adjustment device 28 emits a signal to cause the servomotor 41 which acts on the 3-way distributor to be controlled by the line 42 so that the by-pass 22 communicates with the pipe supply 17 of the heating circuit, which can be done to varying degrees. This results in a more or less pronounced shutdown of the heating circuit 32 of the domestic water accumulator 3. When the temperature of the pilot room drops, the distributor is opened again, which puts the heat exchanger coil 11 more or less widely in communication with the heating circuit 32.

 The embodiment according to FIG. Three differs from the others in that the heat exchanger coil 11 is no longer in the volume of water 8 of the accumulator 3, but is part of an intermediate heat exchanger 50, separate. This heat exchanger 50 contains two coils thermally connected to each other, the coil II of which is in communication with the interior 8 of the accumulator 3 via the flow and return lines 12 and 13, while the other coil 51 communicates directly with the supply and return lines 17 and 20 of the heating circuit.

 It is also possible to provide a single coil, by removing the coil li or 51, which is then bathed directly by the fluid of the heating circuit or that of the flow and return lines 12 and 13.

 Via line 26, the control and adjustment device 28 acts on the motor 52 of a pump 53 which circulates the water of the accumulator 3 through the coil 11, by means of the two pipes 12 and 13.

 When the temperature in the pilot room, read by the probe 31, approaches and reaches the setpoint on which the setpoint generator 29 is set, the positive 28 stops, by a signal sent to the motor 52 via line 26 , pump 53.

Thus, the heating circuit 32 is cut off from the accumulator although the pump 19 continues to run; it can also be stopped.

 The pumps 53 and 19 are restarted when the temperature in the pilot room has dropped by a certain value below the preset setpoint.

 In the exemplary embodiment according to FIG. Four, the heat exchanger coil 11 is again fixed directly to the smoke tube 7, but extends only over the upper part of this tube to open approximately halfway up. on the return side in the space 8 of the accumulator 3. Thus, it is no longer the water of the upper layers of the accumulator 3, as in the embodiment of FIG. three, which flows in the intermediate heat exchanger 50, but the water from medium layers.

The water in the upper part of the accumulator is at rest and is no longer disturbed. The consequence is a higher temperature of the sanitary water and thereby improved water withdrawal conditions.

Claims (6)

Claims 1. Assembly regulating the heat distribution of a source  heated by a fuel, and comprising a circuit  heating with a receiver and a water heater  sanitary, characterized by the fact that, the source of  heat being designed as an accumulator (3) provided di  for the preparation of sanitary and connected water,  by a heat exchanger (11, 50), to a circuit  heater (32) comprising a pump (19), at least one  room heated by this circuit is equipped with a probe  thermometric (31) which, when the temperature  room setpoint is reached, cuts the accumulator  (3) of the heating circuit (32).  2. Assembly according to claim one, characterized by  the fact that the heating circuit (32) is supplied  by a heat exchanger (11) immersed in the volume  domestic water (8) from the accumulator (3), and that it is  provided two solenoid valves (15, 33) ensuring the cut  of the heating circuit (32), one of which is  directly in series with the heat exchanger (11)  and the other is arranged on a parallel bypass (22)  to the latter, and that the assembly is designed so that  one of the two solenoid valves is always open and  the other closed. 3. Assembly according to claim one, characterized by the  causes the heat exchanger (11) supplying the cir  heating bake (32) is made as a coil (11)  wound directly on a smoke tube (7) of the battery  mulator (3) and thus being in close contact  thermal with the outer wall of said smoke tube. 4. Assembly according to claim three, characterized by  the fact that the heat exchanger coil (11) does not  only mounted on the upper part of the smoke tube  (7) and leads, on the return side, into a mid-range  accumulator height. 5. Assembly according to claim one, characterized by  the fact that the heat exchanger (11) supplying the  heating circuit, designed as a trans station  fert (50) independent of the accumulator, and that the co-  primary tee (11) of this station communicates directly  with the volume of water (8) of the accumulator (3) by  supply and return lines with  pump (53) and that the secondary side (51) of the  transfer (50) is connected to a heating receiver (18),  by a supply and return line (17, 20)  with a pump. 6. Installation according to one of claims one to five, ca  characterized by the fact that the temperature probe is  arranged in the room characterized by the most important  both thermal reaction power among the premises  heated by the accumulator.