ES2216373T3 - PROCEDURE TO OPERATE A CLOSED CIRCUIT HYDRAULIC HEATING OR REFRIGERATION AND CLOSED CIRCUIT HYDRAULIC HEATING OR REFRIGERATION. - Google Patents

Abstract

A CIRCULATING LIQUID HEATING INSTALLATION MUST BE SUPPLIED WITH A THERMAL GENERATOR OF TWO CIRCUITS OF DIFFERENT TEMPERATURE HEATING, SO THAT THE BOILER IS MANUALLY MANAGED AS REQUIRED OF THE HIGHEST TEMPERATURE CIRCUIT THAT DIRECTED CIRCUIT REDUCED TEMPERATURE CIRCUIT IS COUPLED THROUGH A MIXING VALVE IN THE DIRECT HEATING CIRCUIT (HEATING CIRCUIT). THE SOLUTION HAS EVEN THE DISADVANTAGE, THAT THE PERFORMANCE OF THE THERMAL PROCESS IS COMPLETELY NON-SATISFACTORY. THE SAME CAN BE APPLIED FOR CORRESPONDING COOLING FACILITIES. THE PROCEDURE HAS PROVIDED THAT THE MIXING CIRCUIT BE REGULARLY SUPPLIED BY MEANS OF THE DRIVE CIRCUIT AND / OR RETURN OF THE DIRECT HEATING CIRCUIT. FOR THIS, WITH PREFERENCE, THE BOTTOM MIXING CIRCUIT IS EXCLUSIVELY SUPPLIED FROM THE RETURN OF THE DIRECT HEATING CIRCUIT AND EXCLUSIVELY REGULATED BY MIXING A RETURN DEVELOPMENT AND UPLOADED BY RECRUITMENT CIRCUIT AND RECRUITMENT REGULATED EXCLUSIVELY THROUGH THE IMPULSION AND RETURN OF THE DIRECT HEATING CIRCUIT. THE PROCEDURE IS SUITABLE FOR ALL HEATINGS OR REFRIGERATIONS OF CIRCULATING LIQUID WITH MULTIPLE CIRCUITS OF REFRIGERATION OR HEATING WITH DIFFERENT TEMPERATURE AND CAN BE USED FOR REFRIGERATION OR WARMING FLUIDS ANY.

Description

Procedure to activate a heating or closed circuit hydraulic cooling and heating or closed circuit hydraulic cooling.

The invention deals with a method for operate a hydraulic heating or cooling circuit closed with a direct heating circuit that presents a feed pipe and a return pipe that is connected directly to the heat / cold generator, and a mixing circuit joined in parallel with the feed and return pipe of the direct heating circuit regulated by mixing its return, and a hydraulic heating or cooling circuit Closed suitable for its realization.

When a water heating installation of closed circuit with a heat generator has to supply two heating circuits differently tempered, normally the boiler moves in a mobile way to the need of the circuit that it must be tempered at a higher temperature (direct circuit of heating), while the circuit to be tempered to a lower temperature (mixing circuit) is coupled to the direct circuit of heating by means of a mixing valve. Combining radiators and floor heating is extended in buildings They are equipped with a heat generator. Normally in this case, the radiators are operated in the direct circuit of heating regulated in mobile mode, and the heating pipe of the soil in the mixing circuit. The mixing circuit is feeds from the feed water of the direct circuit of heating.

A water heating installation of Closed circuit of this type is known from DE 35 39 327 A1, which sets out a procedure for controlling a heating of closed circuit water of a heating installation central, in which the greater of the two theoretical values of direct heating circuit feed temperature and of the mixing circuit serves as a guideline for the closed circuit water heater.

The solution also has the disadvantage that the Thermal process performance is not satisfactory as a whole. It is known that the performance is higher when lower can maintain the return temperature for a temperature of default feed. Similarly, for generators of cold happens that the return temperature must be as high as possible for a predetermined feed temperature.

Because of this, the object of the invention is provide a procedure of the type mentioned at the beginning and a adequate closed circuit hydraulic heating or cooling for its realization, with what can be reduced as much as possible or the return temperature can be kept as high as possible in the direct heating circuit at a feed temperature of the default boiler and with circular currents predetermined

According to the invention, the objective is achieved. thanks to the fact that the following three states of functioning:

to)

The circuit of mix is powered by generator power hot Cold,

b)

The circuit of mixture is fed in an adjustable way by feeding the cold heat generator and by the return of the direct circuit of heating,

c)

The circuit of mixture is fed by the return of the direct circuit of heating.

Preferably, the procedure is carried out. in such a way that the mixing circuit, in case of weak load, is feeds exclusively by the return of the direct circuit heating and is regulated exclusively by mixing its return, and in case of strong load is fed by the heat / cold generator feed and return of direct heating circuit and is regulated exclusively by of mixing these heat / cold currents, in which the Vacuum operation is to be understood as an extreme case of operation with weak load, and the full load must be understand as an extreme case of heavy duty operation, in those that mix the return of the direct heating circuit It is regulated to zero.

The conventional procedure for coupling of the mixing circuit to a direct circuit of heating is improved by means of the procedure according to the invention thanks to the fact that normally a reduction of the return temperature of the direct circuit of heating (in cold installations, an increase in temperature return), which leads to increased performance - in particular in calorific devices. This is achieved thanks to the fact that in the case of a sufficient temperature in the circuit of mixing, first of all return water is supplied from the direct heating circuit to the mixing circuit, and is cast feed water hand only when there is a need for a high temperature, or similarly, in installations of cold, in case of need of a reduced temperature. To do this you can use an appropriate liquid, respectively.

A hydraulic heating or cooling of closed circuit appropriate for performing the procedure is builds according to the invention in such a way that the mixing circuit is joined by its part of the entrance through a second 3-way adjustable mixing valve with supply and return of the direct heating circuit.

Properly, the mixing valves of three ways can be operated by means of servomotors equipped with limit switches.

The servomotors are advantageously blocked between yes by means of limit switches in such a way that after opening the first three-way valve operated by the First servo motor is made possible for the first time the opening of the second three-way mixing valve operated by the second servomotor, and after closing the second three mixing valve pathways it is possible for the first time the closure of the first valve of three way mixing.

In an advantageous way, a check valve before the first three mixing valve tracks in the pipe that deviates from the return of the mixing circuit, and / or a check valve can be arranged before the second three-way mixing valve in the pipe that deviates from the Direct circuit and / or pipeline power supply which deviates from the return of the direct heating circuit and / or is a throttle valve can be arranged in the return of the direct heating circuit between the pipe connection feed and return pipe mixing circuit.

The two three-way mixing valves can be functionally compose to form a four mixing valve tracks with three entrances and with one exit, as well as with a drive of the regulator, in which they may be open, respectively, only the first and second or second and the third entry

An especially advantageous solution to be Industrially prefabricated occurs when the mixing valve four-way comprises tube connections for power and Direct return circuit heating, pipe connections for the supply and return of the mixing circuit and the connections of the boiler and mixing circuit to a unit constructive with a power input, an output of power supply, a return input and a return output of the direct heating circuit, and a power outlet and a Return input of the mixing circuit. In unity constructive, a check valve may also be integrated arranged at least before one of the valve inlets of four-way mix and / or assigned to circuit power direct heating, so that the construction unit is can be arranged directly between the valve and the pumps for two circuits of water and refrigerant.

The invention is explained below with more detail from examples of embodiment. In the drawings respective shows:

Fig. 1 a schematic representation of the mixing circuit according to the invention coupled to a circuit Direct heating of a circuit water heating closed,

Fig. 2 a schematic representation of the coupling known so far,

Fig. 3 an example for a possible connection of the servomotors of the mixing valves of the circuit mixture,

Fig. 4 a four-way valve according to the invention in a symbolic representation and

Fig. 5 a schematic representation of a second variant of the invention with a four mixing valve tracks,

Fig. 6 a schematic representation of a variant similar to that of Fig. 5, although with a generator heat hanging from the wall.

Fig. 1 shows the invention in a schematic representation A P1 pump supplies the n HK radiators, which are directly connected with the power of boiler Q1 of a heat generator WE (heating boiler) and with the return of boiler Q4 (direct heating circuit). The check valve ÜV1 is formed as a gravity brake for circuit Q2. In node K1 a current of deviates Q3 feed of boiler feed water for power to the mixing circuit of a floor heating that It is equipped with a P2 pump that drives the current of the Q8 circuit in the mixing circuit. In the mixing valve three-way MV1, according to the way described below, the water of mixing circuit power is diluted with the current of Q7 return of floor heating in such a way that in water power of the mixing circuit you can get any intermediate temperature

To reduce the temperature of the return to WE heat generator for a predetermined temperature boiler supply and for circular currents Q2 and By default Q8, the amount of water in the boiler feed Q1 as small as possible for a fixed boiler capacity. Since circuit Q2 is considered as given, the supply current Q3 must be reduced or the return current Q6 of the mixing circuit. This happens to through a combination of two MV1 three-way mixing valves and MV2, in which the MV2 mixing valve, and with it the mixing circuit power is connected to the power of the direct heating circuit (supply current Q3) and with the return of the direct heating circuit (current of power Q5).

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In this case, the mixing valves MV1 and MV2 are they must cascade in the manner described continuation:

When the MV1 mixing valve is not fully open, then the MV2 mixing valve is completely closed,

or the return current Q7 \ neq 0 => Supply current Q3 = 0, supply current Q5 > = 0

Y,

when the mixing valve MV2 is not completely closed, then the MV1 mixing valve is completely open

or the supply current Q3 \ neq 0 => return current Q7 = 0, supply current Q5> = 0.

The case

in which the mixing valve MV1 is not fully open and MV2 mixing valve is completely closed,

or in which the return current Q7 \ neq 0 and the supply current Q3 = 0

represents the load case weak,

and the case

in which the mixing valve MV2 is not completely closed and the MV1 mixing valve is completely open,

or the supply current Q3 \ neq 0 and the return current Q7 = 0 represents the load case strong.

The case

in which the mixing valve MV1 is fully open and in which the MV2 mixing valve is completely closed,

or in which the return current Q7 = 0 and the supply current Q3 = 0

It is in this case the limit load case permitted.

The case cannot be given.

in which the MV mixing valve is not fully open and MV2 mixing valve is not completely closed,

or in which the return current Q7 \ neq 0 and the supply current Q3 \ neq 0,

since the MV1 mixing valve opens completely before the MV2 mixing valve starts to open. In the closing the reverse process occurs, closing in first the mixing valve MV2 and then the mixing valve MV1

By state of full charge, the state in which the two mixing valves MV1, MV2 are open completely, or the return current Q7 = 0 and the current supply Q5 = 0 or supply current Q3 = return current Q6, and by idle operation it must be understand the one in which the two are completely closed or the supply current Q3 = 0 and the supply current Q5 = 0.

With this, in the case of weak load, the circuit mixing is regulated only by mixing the current of return Q7 with the help of the MV1 mixing valve. If the load requirement rises beyond the load case limit, then the MV1 mixing valve remains open, and the return current Q7 becomes zero. MV2 mixing valve is additionally open and in this case partially withdraw water from the direct heating circuit feed until with the full load occurs the case in which the water for the mixing circuit power is extracted only from the Direct heating circuit feed.

Fig. 2 represents, on the contrary, the state of the technique of coupling a mixing circuit to a direct heating circuit by means of a mixing valve Three or four way MV1.

The P1 pump in turn supplies the n HK radiators, which are directly connected to the generator WE heat (heating boiler). In this arrangement, the current return Q6 that leaves the mixing circuit is the same as the supply current Q3 entering the mixing circuit. The magnitude of regulation adjustment acts, for example by means of a three point signal "march-stop-march", about a servo motor M. However, there is also the possibility of using another drive of the regulator.

Correspondingly, regulation is possible by means of two servomotors M1 and M2 for the mixing valves MV1 and MV2 of the arrangement according to the invention described in the Fig. 1. Through the wiring shown in Fig. 3 of the switch at the end of the run of the two servomotors M1 and M2, for example, you can reach the catalog of requirements mentioned previously, and at the same time you can represent a continuous regulator drive out for signal three points "MARCH-STOP-MARCH" described previously.

The position of the end switches of stroke indicated in Fig. 3 corresponds to the position of rest, that is, first of all with a joint connection in a status not allowed, since none of the M1 and M2 servomotors It is in its final position. However, a first change in the regulation game already leads to one of the cases allowed, that is, fully open the mixing valve MV1 and then open the MV2 mixing valve connected to then close the mixing valve MV2 and then then close the MV1 mixing valve connected to continuation.

Regarding the conventional coupling of Fig. 2, boiler feed Q1 with circular currents Q2 and Unmodified Q8 of Fig. 1 is lower in the current value supply Q5, which leads, in case of temperatures of fixed feed and a fixed capacity of the boiler, for that purpose Desired temperature reduction at boiler return. At the same time, the three-point regulation signal can be used of an existing regulation, since the provision acts in a way equivalent over the controlled magnitude - temperature of power in the mixing circuit - than in the coupling conventional.

It is described below from the symbolic representation of Fig. 4 a device that makes actually the procedure in an economically advantageous way. This formed mainly by the union of the two mixing valves three-way forming a four-way mixing valve MV with a mobile valve body, a drive element M with the same regulatory behavior, as described previously, three inputs 1, 2 and 3 and one output 4. In this case is indifferent to whether it is the case of the mobile body of a lifting or rotating body.

On the contrary, the mixing valve is characterized in its function in a unique way by means of following features:

The region of permanence of a body of regulation not shown here is divided, with permanent mobility, at three points (end I, midpoint, end II) and two regions (region I, region II), which can be designated, analogously to the definition mentioned above, as full load, load strong, limit load, weak load and idle operation. In case full load, there is only one junction from input 1 to output 4, in the case of strong load it can be achieved by means of slider mode regulating body movement any mixing ratio of inputs 1 and 2 to output 4, in the case limit load there is only one junction from input 2 to output 4, in the case of weak load can be achieved through movement of the sliding mode regulating body any relationship of mix of inputs 2 and 3 to output 4, and in the case of idle operation there is only one junction of input 3 to the exit 4.

The following table 1 shows the relationships described in an easy to understand way

TABLE 1

Case of load Full load Strong load Load limit Load weak Functioning in empty Entry one Open Open Closed Closed Closed partially Entry two Closed Open Open Open Closed partially partially Entry 3 Closed Closed Closed Open Open partially Position End I Region I Middle point Region II End II

Fig. 5 shows the coupling of a circuit by means of a four-way mixing valve MV as it has been previously described.

The hydraulic system is expanded in this case optionally with a DV throttle valve as well as with two check valves ÜV2 and ÜV3. The throttle valve DV has to increase in both directions (return current Q4 of positive or negative mode) the pressure difference between the nodes K2 and K3, and can also be done without moving parts such as retention disc or other strangulation of the cross section. The check valves ÜV2 and ÜV3 act avoiding the return of current and eliminate parasitic circular currents.

The arrangement can be done so advantageous in such a way that the individual construction pieces surrounded by strokes they join together forming a group construction with six tube connections and a drive regulator. Thus, the provision can be provided as prefabricated industrial accessory, and reduces considerably the cost of assembly of the construction part.

Fig. 6 finally shows a variant with a WE1 heat generator hanging from the wall, in which it is integrated the pump P1 for the direct circuit drive of heating. To avoid in the case of heavy load, that is, with Q3 \ 0 and Q5 \ 0, a parasitic circular current along the boiler feed pipes Q1, from the streams of supply Q3 and Q5 as well as boiler return Q4, it is expected in the supply current Q5 a check valve ÜV4.

Claims (12)

1. Procedure for operating a closed circuit hydraulic heating or cooling system with a direct heating circuit (nHK) that has a supply line and a return line that is directly connected to the heat / cold generator, and a mixed mixing circuit in parallel with the supply and return line of the direct heating circuit (nHK), whose return is mixed to its own supply, characterized in that the following three operating states are possible:

to.

The circuit of mix is powered by generator power hot Cold,

b.

The circuit of mixture is fed in an adjustable way by feeding the heat / cold generator and by the return of the direct circuit of heating (nHK),

c.

The circuit of mixture is fed by the return of the direct circuit of heating (nHK).

2. Method according to claim 1, characterized in that the mixing circuit, in case of weak load, is fed exclusively by the return of the direct heating circuit (nHK) and is regulated exclusively by mixing its return, and in In the case of a strong load, it feeds on the heat / cold generator supply and the return of the direct heating circuit (nHK) and is regulated exclusively by mixing these heat / cold currents. 3. Closed circuit heating or cooling with a direct heating circuit (nHK) that has a feed pipe and a return pipe and a mixing circuit connected in parallel with the feed and return pipe of the direct heating circuit (nHK), which is equipped with a first three-way mixing valve (MV1) adjustable for mixing the return of the mixing circuit with its own supply, characterized in that the mixing circuit is connected, at the inlet part, by means of a second three-way mixing valve (MV2) adjustable with the supply and return line of the direct heating circuit (nHK). 4. Closed circuit hydraulic heating or cooling according to claim 3, characterized in that the three-way mixing valves (MV1, MV2) can be operated with servomotors (M1, M2) equipped with limit switches. 5. Hydraulic closed circuit heating or cooling according to claim 4, characterized in that the servomotors (M1, M2) are locked together by means of limit switches in such a way that after the opening of the first mixing valve of Three-way (MV1) driven by the first servomotor (M1) makes it possible for the first time the opening of the second three-way mixing valve (MV2) operated by a second servo motor (M2), and after the closing of the second valve Three-way mixing (MV2) makes it possible for the first time to close the first three-way mixing valve (MV1). 6. Closed circuit hydraulic heating or cooling according to one of claims 3 to 5, characterized in that the first and second three-way mixing valve (MV1, MV2) are functionally joined to form a four-way mixing valve (MV ) with three inputs (1, 2, 3) and one output (4), as well as with a drive of the regulator, in which only the first (1) and the second (2) or the second (2) can be opened simultaneously (2) and the third entry (3) respectively. 7. Closed circuit hydraulic heating or cooling according to one of claims 3 to 6, characterized in that a check valve (ÜV2) is arranged before the first three-way mixing valve (MV1) in the pipe that deviates from the return of the mixing circuit. 8. Closed circuit hydraulic heating or cooling according to one of claims 3 to 7, characterized in that a check valve (ÜV3) is arranged before the second three-way mixing valve (MV2) in the pipe that deviates from the Direct heating circuit feed. 9. Closed circuit hydraulic heating or cooling according to one of claims 3 to 8, characterized in that a check valve (ÜV4) is arranged before the second three-way mixing valve (MV2) in the pipe that deviates from the return of the direct heating circuit. 10. Closed circuit hydraulic heating or cooling according to one of claims 3 to 9, characterized in that in the return of the direct heating circuit (Q4) a throttle valve (DV) is arranged between the connection of the supply line and the mixing circuit return. 11. Closed circuit hydraulic heating or cooling according to one of claims 6 to 10, characterized in that the four-way mixing valve (MV), the pipe connections for the supply and the return of the direct heating circuit, the connections of pipe for the feeding and the return of the mixing circuit and the connections of the direct and mixing circuit are joined forming a constructive unit with a feed inlet, a feed outlet, a return inlet and a return outlet of the direct circuit of heating, and a power outlet and a return input of the mixing circuit. 12. Hydraulic closed circuit heating or cooling according to claim 11, characterized in that at least one of the check valves (ÜV1, ÜV2, ÜV3) arranged before the inputs of the four-way mixing valve (MV) and / or assigned to the supply of the direct heating circuit and / or a throttle valve (DV) assigned to the return of the direct heating circuit is integrated in the construction unit.