Cooling circuit and operating method of cooling circuit

FIELD: heating.

SUBSTANCE: cooling circuit for circulation of carbon dioxide as cooling agent in it has the first expansion device for expansion of cooling agent from high pressure to intermediate pressure and the second expansion device for expansion of cooling agent from intermediate pressure to evaporation pressure. The first expansion device is made in the form at least of two in-parallel connected valves (a, b, c, d) so that in case of failure in the valve (a) or at the valve (a) the latter is switched off, and at least one of the remaining operating valves (b, c, d) continues providing the controlled operation of cooling circuit.

EFFECT: use of invention excludes the need for switching off the whole cooling circuit in case of failed valve.

13 cl, 1 dwg

 

The invention relates to a cooling circuit in which circulates a single component or multicomponent refrigerant having at least one device for reducing the pressure.

In addition, the invention relates to a method of operating a cooling circuit.

The circuits of this type are well known. They are used, for example, in refrigeration systems, the so-called combined refrigeration systems used in supermarkets. Usually combined refrigeration plant supplies there are many users of refrigeration, such as refrigerators, refrigeration and freezer equipment. To do this, they circulates single-component or multi-component refrigerant, respectively, the mixture of refrigerants. This refrigerant is transferred, preferably relative to the outside air, in liquid state, is fed through provided if necessary collector tank for the refrigerant in one or more consumers of the cold front which included injection valves, and evaporates in them. Then, using single-stage or multi-stage compressor unit of evaporated refrigerant is again compressed to the desired high pressure of the refrigeration cycle and again serves for the above-mentioned transfer in the liquid state.

Modern (combined) Ho is Umilenie installation accordingly, the cooling circuit in which a refrigerant is applied dioxide and which, at least temporarily work in a supercritical, respectively supercritical regime, have a regulating valve high pressure. It is designed to expand the refrigerant to a high pressure, which is between 45 and 120 bar, to an intermediate pressure between 30 and 40 bar. As the adjusting valves high pressure was applied up to the present time electrical control valves and pneumatic control valves for continuous control.

However, if this valve there is any malfunction, it is necessary to shut down the entire cooling circuit. This leads to a number of obvious drawbacks.

The objective of this invention is to provide a cooling circuit, as well as the development of a method of operating a cooling circuit, which eliminates the above disadvantages.

Thus, according to one variant of the invention, the proposed cooling circuit for the circulation of carbon dioxide as a refrigerant, having at least one first expansion device for expanding refrigerant from high pressure to an intermediate pressure, and at least one second expansion device for expanding cladag the NTA from the intermediate pressure to the low pressure wherein the first expansion device made in the form of at least two valves connected in parallel (a, b, C, d), so that at least one of the valves (a, b, C, d) continues to provide an adjustable work of the cooling circuit.

Preferably the second expansion device is an injection valve (e) heat exchanger (B).

Preferably, the first expansion device is located downstream before injection valve (e) heat exchanger (B).

Preferably the expansion device is located downstream in front of the reservoir tank (A) for the refrigerant.

Preferably, at least two valve connected in parallel (a, b, C, d) are regulators high pressure.

Preferably regulating valves high pressure intended for expanding the refrigerant from a high pressure, which is between 45 and 120 bar, to an intermediate pressure between 30 and 50 bar.

Preferably used valves (a, b, C, d) are constantly regulating and/or not constant regulation.

Preferably, at least one of the valves (a, b, C, d) is a magnetic valve.

Preferably, at least two valves are magnetic valves, and magnetic valves are located in ventolinonline.

Preferably, at least two valve connected in parallel (a, b, C, d) have different magnitudes of pressure loss.

According to another variant embodiment of the invention, a method of operation of the above cooling circuit, in which, in case of malfunction of one of the valves connected in parallel (a, b, C, d) it turns off, and the other or at least one of the other valves provides adjustable mode of operation of the cooling circuit.

Preferably the cooling circuit operates in a supercritical or supercritical mode.

Preferably by a combination of constantly regulating magnetic valve with different amounts of pressure loss implement different amounts of consumption.

The cooling circuit according to the invention is characterized by the fact that the expansion device (a device for reducing the pressure) made in the form of at least two valves connected in parallel.

According to a preferred variant implementation of the cooling circuit according to the invention applied valves performed continuously and/or not constant regulation.

On how the problem is solved by the fact that in the event of a malfunction of one of the valves connected in parallel to switch it off, and the other or at least one of the other valves both of which provides further adjustable mode of operation of the cooling circuit.

As a modification of the cooling circuit according to the invention proposes that at least two valve connected in parallel have different values of Kv, respectively, the magnitude of the pressure loss.

Particularly preferably, when according to another preferred variant the execution of the cooling circuit according to the invention, at least one valve is a magnetic valve.

Below is a detailed description of the cooling circuit according to the invention, the method of operation according to the invention, as well as ways of their implementation on the basis shown in the drawing of the example execution.

The drawing shows a diagram of a conventional cooling circuit, and through the pipeline 1 is supplied with a flow of the refrigerant, which has a pressure of, for example, 100 bar, in the valve block, consisting of parallel connected, respectively, located magnetic valves a, b, c and d. When closed or open magnetic valves b, C and d in the magnetic valve and the expansion of the refrigerant to an intermediate pressure of 30 to 50 bar, for this refrigerant through the section 1A of the pipe is fed into the solenoid valve and, it expands and then through the pipes 2A and 2 served in the enabled before the consumer cold/heat exchanger In the collector tank And refrigerant. From the manifold d is ervoir And the refrigerant through line 3 is fed into the injection valve E. the consumer's cold/heat exchanger, in which it is expanded to the desired evaporation pressure, and evaporates in the consumer cold/heat exchanger Century And the consumer cold/heat exchanger, and the corresponding injection valve e is one or more parallel spaced consumers cold/heat exchangers together with the respective injection valves. Through pipeline 4 the evaporated refrigerant is absorbed using a single-stage or multi-stage compressor unit compresses it again until the desired high pressure of the cooling circuit, and then through line 5 is applied to the capacitor D.

If there is a fault in the valve, or the valve and then it turns off and at least one of the remaining intact magnetic valves b, C or d provides a regulated operation of the cooling circuit, respectively, the high pressure control.

Applied magnetic valves a-d are preferably only in clock mode (opening /closing) with pulse-width modulation or in a cascade configuration. From the use of prone to malfunction expensive continuously regulating valves according to the invention can be abandoned.

As a modification of the cooling circuit according to the invention is proposed that the magnetic valves are, respectively, installed in about the future of a valve block.

According to one preferred variant of execution of the cooling circuit according to the invention applied to the gates a-d can be in principle performed continuously regulating and/or not constant regulation.

Thus, it is possible to apply, respectively, to combine with each other constantly regulating and/or not constant regulation, as well as solely constantly regulating and not constantly regulating valves.

If you are not constantly regulating magnetic valves with different values of Kv and they are combined with each other, you can implement different amounts of consumption.

1. The cooling circuit for the circulation of carbon dioxide as a refrigerant, having at least one first expansion device for expanding refrigerant from high pressure to an intermediate pressure and at least one second expansion device for expanding refrigerant from an intermediate pressure to the pressure evaporation, wherein the first expansion device made in the form of at least two valves connected in parallel (a, b, C, d), so that in the event of a malfunction in the valve (s) or valve (s) he shuts down, and at least one of the remaining, intact valves (b, C, d) continues to provide an adjustable work is antura cooling.

2. The cooling circuit of claim 1, wherein the second expansion device is an injection valve (e) heat exchanger (B).

3. The cooling circuit according to claim 2, in which the first expansion device is located downstream before injection valve (e) heat exchanger (B).

4. The cooling circuit according to any one of claims 1 to 3, in which the expansion device is located downstream in front of the reservoir tank (A) for the refrigerant.

5. The cooling circuit according to claim 1, in which at least two valve connected in parallel (a, b, C, d) are regulators high pressure.

6. The cooling circuit according to claim 5, in which the control valves high pressure intended for expanding the refrigerant from a high pressure, which is between 45 and 120 bar, to an intermediate pressure between 30 and 50 bar.

7. The cooling circuit according to claim 1, in which used valves (a, b, C, d) are constantly regulating and/or not constant regulation.

8. The cooling circuit according to claim 1, in which at least one of the valves (a, b, C, d) is a magnetic valve.

9. The cooling circuit according to claim 1, in which at least two valves are magnetic valves, and magnetic valves located in the valve block.

10. The cooling circuit according to claim 1, in which at least two of the United parallel is but valve, and, b, C, d) have different magnitudes of pressure loss.

11. A method of operating a cooling circuit according to claim 1, characterized in that in the event of a malfunction of one of the valves connected in parallel (a, b, C, d) it shuts down, and at least one of the remaining, intact valves (b, C, d) continues to provide an adjustable work of the cooling circuit.

12. The method according to claim 11, wherein the cooling circuit operates in a supercritical or supercritical mode.

13. The method according to claim 11 or 12, in which due to a combination of not constantly regulating magnetic valve with different amounts of pressure loss implement different amounts of consumption.



 

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FIELD: physics.

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11 cl, 10 dwg

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