JP5871681B2 - Refrigeration cycle and refrigeration showcase - Google Patents

Description

  The present invention relates to a refrigeration cycle and a refrigeration showcase provided with an ejector, and more specifically, a refrigeration cycle capable of increasing the flow rate of a driving flow by using a lubricating oil of a compressor as a part of the driving flow of the ejector. And a frozen showcase.

  As a conventional refrigeration cycle, a compressor, a condenser, a first expansion valve and a second expansion valve for expanding the refrigerant that has passed through the condenser, a refrigerant expanded by the first expansion valve, and an expansion by the second expansion valve An internal heat exchanger that exchanges heat with the refrigerant before the heat treatment, an evaporator that evaporates the refrigerant expanded by the first expansion valve by heat exchange, and a refrigerant that has passed through the second expansion valve and the internal heat exchanger are used as a driving flow. And an ejector that mixes the drive flow and the suction flow and supplies them to the compressor using the refrigerant that has passed through the internal heat exchanger and the first expansion valve as a suction flow (for example, Patent Document 1). reference).

JP 2008-82693 A

  However, in the conventional refrigeration cycle, when sufficient heat of vaporization cannot be obtained in the internal heat exchanger, there is a possibility that the refrigerant used as the drive flow of the ejector is insufficient and the efficiency of the refrigeration cycle is lowered. .

  Therefore, a problem to be solved by the present invention that addresses such problems is to provide a refrigeration cycle and a refrigeration showcase that can increase the flow rate of the ejector drive flow.

  In order to solve the above problems, a refrigeration cycle according to a first invention includes a compressor for compressing a refrigerant, a condenser for condensing the refrigerant compressed by the compressor, and a refrigerant branched downstream of the condenser. A first expansion valve and a second expansion valve for expanding the refrigerant, an evaporator for evaporating the refrigerant expanded by the first expansion valve, a heat exchanger for evaporating the refrigerant expanded by the second expansion valve, and the heat An ejector that feeds the refrigerant evaporated in the exchanger as a driving flow, the refrigerant evaporated in the evaporator as a suction flow, and mixes the driving flow and the suction flow to the compressor; the compressor and the condenser; An oil separator that separates the lubricating oil of the compressor from the refrigerant, and at least a part of the lubricating oil separated by the oil separator between the heat exchanger and the ejector And a first flow path for supplying to Those were.

  The refrigeration showcase according to the present invention includes the refrigeration cycle according to the present invention.

  According to the refrigeration cycle and the refrigeration showcase according to the present invention, the lubricating oil of the compressor separated by the oil separator can be used as a part of the drive flow of the ejector. Therefore, the flow rate of the ejector drive flow increases, and the efficiency of the refrigeration cycle can be improved.

It is a schematic block diagram which shows 1st Embodiment of the refrigerating cycle by this invention. It is a schematic block diagram which shows the other Example of the said 1st Embodiment. It is a schematic block diagram which shows 2nd Embodiment of the refrigerating cycle by this invention. It is a schematic block diagram which shows 3rd Embodiment of the refrigerating cycle by this invention. It is a schematic block diagram which shows the other Example of the said 3rd Embodiment.

Hereinafter, a first embodiment of a refrigeration cycle according to the present invention will be described with reference to FIGS.
This refrigeration cycle is used in a refrigeration showcase, a vending machine, an air conditioner, and the like. As shown in FIG. 1, the compressor 1, the condenser 2, the heat exchanger 3, and the first expansion are used. The valve 4, the evaporator 5, the second expansion valve 6, the ejector 7, and refrigerant pipes A to H that connect them are configured.

  The compressor 1 compresses a refrigerant to raise the temperature and raise the pressure, and can be selected from known compressors such as a reciprocating compressor, a swash plate compressor, a screw compressor, and a scroll compressor. The refrigerant compressed by the compressor 1 is supplied to the condenser 2 through the refrigerant pipe A.

  The condenser 2 cools and condenses the refrigerant compressed by the compressor 1 by heat exchange with the outside air. The refrigerant condensed in the condenser 2 is supplied to the heat exchanger 3 through the refrigerant pipe B.

The heat exchanger 3 further cools the refrigerant condensed in the condenser 2 by exchanging heat between the refrigerant condensed in the condenser 2 and the refrigerant expanded in the second expansion valve 6, and expands in the second expansion valve 6. The evaporated refrigerant is evaporated. The refrigerant cooled by the heat exchanger 3 passes through the refrigerant pipe C and is branched into the refrigerant pipes C ₁ and C ₂ at the branch point S downstream of the condenser 2.

It will be described first refrigerant branched into refrigerant pipe C _1. The refrigerant branched into the refrigerant pipe C ₁ is supplied to the first expansion valve 4. The flow rate of the refrigerant is branched into refrigerant pipe C ₁ can be controlled by adjusting the first expansion valve 4, the respective degree of opening of the second expansion valve 6.

  The first expansion valve 4 expands the refrigerant cooled by the heat exchanger 3 by reducing the pressure. The refrigerant expanded by the first expansion valve 4 is supplied to the evaporator 5 through the refrigerant pipe D.

  The evaporator 5 cools air and evaporates the refrigerant by exchanging heat between the refrigerant that has passed through the first expansion valve 4 and the air. The refrigerant is preferably heat-exchanged (heated) so as to have a predetermined degree of superheating when it passes through the evaporator 5. The refrigerant evaporated in the evaporator 5 is sucked into the ejector 7 through the refrigerant pipe E.

Next, a description will be given refrigerant branched into refrigerant pipe C _2. The refrigerant branched into the refrigerant pipe C ₂ is supplied to the second expansion valve 6. The flow rate of the refrigerant is branched into refrigerant pipe C ₂ can be controlled by adjusting the first expansion valve 4, the respective degree of opening of the second expansion valve 6.

  The second expansion valve 6 expands the refrigerant cooled by the heat exchanger 3 by reducing the pressure. The pressure of the refrigerant expanded by the second expansion valve 6 is preferably higher than the pressure of the refrigerant expanded by the first expansion valve 4. The refrigerant expanded by the second expansion valve 6 is supplied to the heat exchanger 3 through the refrigerant pipe F.

  The refrigerant supplied to the heat exchanger 3 evaporates by exchanging heat with the refrigerant before branching at the branch point S downstream of the condenser 2 (upstream from the branch point S). The refrigerant evaporated in the heat exchanger 3 passes through the refrigerant pipe G from the heat exchanger 3 and is supplied to the ejector 7 as a driving flow.

  The ejector 7 uses the refrigerant evaporated in the heat exchanger 3 as a driving flow, sucks the refrigerant evaporated in the evaporator 5 due to the static pressure drop caused by the driving flow, mixes the driving flow and the suction flow, and compresses the compressor 1. To supply. Since the ejector 7 sucks the refrigerant evaporated in the evaporator 5 using the kinetic energy of the driving flow, the efficiency of the refrigeration cycle can be improved. The refrigerant mixed in the ejector 7 is supplied to the compressor 1 through the refrigerant pipe H.

  Here, the refrigeration cycle according to the present invention further includes an oil separator 8. The oil separator 8 separates the lubricating oil that lubricates the compressor 1 from the refrigerant and prevents the lubricating oil from flowing into the condenser 2, and is provided on the refrigerant pipe A between the compressor 1 and the condenser 2. Is provided. The oil separator 8 is connected to a first flow path P and a second flow path Q, which are flow paths for the separated lubricating oil.

  The first flow path P is a flow path that connects the oil separator 8 and the refrigerant pipe G, and at least part of the lubricating oil separated by the oil separator 8 passes through the first flow path P and is a refrigerant pipe. G is supplied. The lubricating oil supplied to the refrigerant pipe G through the first flow path P is supplied as a driving flow to the ejector 7 together with the refrigerant supplied from the heat exchanger 3. On the first flow path P, first valve means 9 for adjusting the amount of lubricating oil supplied to the ejector 7 is provided. By controlling the opening degree of the first valve means 9, the lubricating oil is supplied. The supply amount can be adjusted.

  The second flow path Q is a flow path that connects the oil separator 8 and the refrigerant pipe H, and at least part of the lubricating oil separated by the oil separator 8 passes through the second flow path Q and is a refrigerant pipe. H is supplied. The lubricating oil supplied to the refrigerant pipe H through the second flow path Q is supplied to the compressor 1 together with the refrigerant supplied from the ejector 7. On the 2nd flow path Q, the 2nd valve means 10 which adjusts supply_amount | feed_rate of the lubricating oil supplied to the compressor 1 is provided, and lubricating oil is controlled by controlling the opening degree of the 2nd valve means 10. The supply amount can be adjusted. As the second valve means 10, it is preferable to use an electromagnetic valve that controls the opening and closing of the second flow path Q.

  According to the present embodiment, the refrigeration cycle includes the compressor 1 that compresses the refrigerant, the condenser 2 that condenses the refrigerant compressed by the compressor 1, and the refrigerant branched at the branch point S downstream of the condenser 2. The first expansion valve 4 and the second expansion valve 6 for expanding the refrigerant, the evaporator 5 for evaporating the refrigerant expanded by the first expansion valve 4, and the heat exchanger 3 for evaporating the refrigerant expanded by the second expansion valve 6. The ejector 7 that supplies the compressor 1 with the suction flow and the drive flow mixed with the refrigerant evaporated in the evaporator 5 as the suction flow, the refrigerant evaporated in the heat exchanger 3 as the drive flow, and the compressor 1 Between the refrigerant and the condenser 2 and separates the lubricating oil of the compressor 1 from the refrigerant. At least a part of the lubricating oil separated by the oil separator 8 is transferred to the heat exchanger 3 and the ejector 7. The first flow path P that supplies the refrigerant pipe G between the oil separator and the oil separator. In the separated lubricating oil of the compressor 1 can be supplied as a motive flow to the ejector 7 through the first flow path P. Thereby, the flow volume of the drive flow of the ejector 7 increases, and the efficiency of a refrigerating cycle can be improved.

  Further, according to the present embodiment, the refrigeration cycle includes the first valve means 9 that adjusts the supply amount of the lubricating oil on the first flow path P. Therefore, by controlling the opening degree of the first valve means 9 The amount of lubricating oil supplied to the refrigerant pipe G can be adjusted, and the flow rate of the drive flow of the ejector 7 can be adjusted appropriately.

  According to the present embodiment, the refrigeration cycle includes the second flow path Q that supplies at least a part of the lubricating oil separated by the oil separator 8 to the refrigerant pipe H between the ejector 7 and the compressor 1. Therefore, when the supply amount of the lubricating oil supplied from the oil separator 8 to the refrigerant pipe G is reduced or the amount of the lubricating oil separated by the oil separator 8 is increased, surplus is generated in the lubricating oil. Even so, the lubricating oil can be supplied to the compressor 1 via the second flow path Q. Thereby, the poor separation of the lubricating oil in the oil separator 8 and the excessive supply of the lubricating oil to the refrigerant pipe G can be prevented.

  Moreover, according to this embodiment, since the refrigerating cycle is provided with the 2nd valve means 10 which adjusts supply_amount | feed_rate of lubricating oil on the 2nd flow path Q, by controlling the opening degree of the 2nd valve means 10 The amount of lubricating oil supplied to the refrigerant pipe H can be adjusted appropriately.

  Further, according to the present embodiment, the heat exchanger 3 evaporates the refrigerant expanded by the second expansion valve 6 by heat exchange with the refrigerant condensed by the condenser 2. That is, the refrigerant condensed by the condenser 2 is further cooled by the refrigerant expanded by the second expansion valve 6. Therefore, the degree of supercooling of the refrigerant condensed in the condenser 2 can be increased, and the efficiency of the refrigeration cycle can be improved.

  Further, according to the present embodiment, the heat exchanger 3 evaporates the refrigerant expanded by the second expansion valve 6 by heat exchange with the refrigerant before branching at the branch point S downstream of the condenser 2. That is, the refrigerant condensed by the condenser 2 is further cooled by the refrigerant that has been cooled in advance by the heat exchanger 3. Therefore, the degree of supercooling of the refrigerant condensed in the condenser 2 can be increased, and the efficiency of the refrigeration cycle can be improved.

  In the present embodiment, the heat exchanger 3 evaporates the refrigerant expanded by the second expansion valve 6 by heat exchange with the refrigerant before branching at the branch point S downstream of the condenser 2. However, as shown in FIG. 2, the refrigerant expanded by the second expansion valve 6 is evaporated by heat exchange with the refrigerant branched at the branch point S downstream of the condenser 2 and before being expanded by the first expansion valve 4. A configuration may be adopted.

  Next, a second embodiment of the present invention will be described with reference to FIG. This refrigeration cycle includes a compressor 1, a condenser 2, an ejector 7, a gas-liquid separator 11, an evaporator 5, and refrigerant pipes A to I that connect them.

  In the present embodiment, the refrigerant compressed by the compressor 1 is supplied to the condenser 2 through the refrigerant pipe A, condensed in the condenser 2, and supplied as a driving flow to the ejector 7 through the refrigerant pipe B. The drive flow and the suction flow are mixed by the ejector 7 and supplied to the compressor 1. Between the ejector 7 and the compressor 1, there is provided a gas-liquid separator 11 that separates the liquid-phase refrigerant from the refrigerant supplied from the ejector 7 to the compressor 1, and the refrigerant discharged from the ejector 7 is Then, it flows into the gas-liquid separator 11 through the refrigerant pipe H. Of the refrigerant flowing into the gas-liquid separator 11, the gas-phase refrigerant is supplied to the compressor 1 through the refrigerant pipe I, and the liquid-phase refrigerant is separated and supplied to the evaporator 5 through the refrigerant pipe D. The The liquid-phase refrigerant supplied to the evaporator 5 evaporates in the evaporator 5, and is sucked as a suction flow of the ejector 7 through the refrigerant pipe E due to a decrease in static pressure caused by the drive flow of the ejector 7.

  Between the compressor 1 and the condenser 2, an oil separator 8 for separating the lubricating oil of the compressor 1 from the refrigerant is provided. The oil separator 8 is connected to a first flow path P and a second flow path Q, which are flow paths for separated refrigerant.

  The first flow path P is a flow path connecting the oil separator 8 and the refrigerant pipe B, and at least a part of the lubricating oil separated by the oil separator 8 passes through the first flow path P and is a refrigerant pipe. B is supplied. The lubricating oil supplied to the refrigerant pipe B through the first flow path P is supplied as a driving flow to the ejector 7 together with the refrigerant supplied from the condenser 2. On the first flow path P, first valve means 9 for adjusting the amount of lubricating oil supplied to the ejector 7 is provided. By controlling the opening degree of the first valve means 9, the lubricating oil is supplied. The supply amount can be adjusted.

  The second flow path Q is a flow path that connects the oil separator 8 and the refrigerant pipe I, and at least part of the lubricating oil separated by the oil separator 8 passes through the second flow path Q and is a refrigerant pipe. I. The lubricating oil supplied to the refrigerant pipe I through the second flow path Q is supplied to the compressor 1 together with the refrigerant supplied from the ejector 7. On the 2nd flow path Q, the 2nd valve means 10 which adjusts supply_amount | feed_rate of the lubricating oil supplied to the compressor 1 is provided, and lubricating oil is controlled by controlling the opening degree of the 2nd valve means 10. The supply amount can be adjusted. As the second valve means 10, it is preferable to use an electromagnetic valve that controls the opening and closing of the second flow path Q.

  According to the present embodiment, the refrigeration cycle is driven by using the compressor 1 that compresses the refrigerant, the condenser 2 that condenses the refrigerant compressed by the compressor 1, and the refrigerant condensed by the condenser 2 as a driving flow. A liquid-phase refrigerant is separated from an ejector 7 which mixes a suction flow sucked by a static pressure drop caused by the flow and the driving flow and supplies the mixed flow to the compressor 1 and a refrigerant which is supplied from the ejector 7 to the compressor 1. Provided between the compressor 1 and the condenser 2, the gas-liquid separator 11, the evaporator 5 that evaporates the liquid-phase refrigerant separated by the gas-liquid separator 11 and supplies it as a suction flow of the ejector 7, An oil separator 8 that separates the lubricating oil of the compressor 1 from the refrigerant, and a first that supplies at least a part of the lubricating oil separated by the oil separator 8 to the refrigerant pipe B between the condenser 2 and the ejector 7. Since it is configured to include the flow path P, it is separated by the oil separator 8 The lubricating oil of the compressor 1 can be supplied as a motive flow to the ejector 7 through the first flow path P. Thereby, the flow volume of the drive flow of the ejector 7 increases, and the efficiency of a refrigerating cycle can be improved.

  Next, a third embodiment of the present invention will be described with reference to FIGS. This refrigeration cycle includes a compressor 1, a condenser 2, an expansion valve 4, a first evaporator 5a, an ejector 7, a second evaporator 5b, and refrigerant pipes A to I connecting them. Consists of.

In the present embodiment, the refrigerant compressed by the compressor 1 is supplied to the condenser 2 through the refrigerant pipe A, condensed in the condenser 2, passes through the refrigerant pipe B, and the branch point S downstream of the condenser 2. Is branched into refrigerant pipes B ₁ and B ₂ .

Refrigerant branched into refrigerant pipe B ₁ represents, expands in the expansion valve 4 is supplied to the first evaporator 5a through refrigerant pipe D, evaporated by heat exchange with the outside air in the first evaporator 5a, the refrigerant pipe It is sucked as a suction flow of the ejector 7 through E.

The refrigerant branched into the refrigerant pipe B ₂ is supplied as a drive flow to the ejector 7, mixed with the suction flow, and supplied to the compressor 1.

  A second evaporator 5b is provided between the ejector 7 and the compressor 1, and the refrigerant discharged from the ejector 7 is supplied to the second evaporator 5b through the refrigerant pipe H, and is connected to the outside air. Evaporates by heat exchange. The refrigerant evaporated in the evaporator 5b is supplied to the compressor 1 through the refrigerant pipe I.

  In the present embodiment, the first evaporator 5a and the second evaporator 5b are arranged side by side and constitute one evaporator 5 as a whole. In the evaporator 5, the first evaporator 5a is disposed on the leeward side, and the second evaporator 5b is disposed on the leeward side. Therefore, the outside air (air) cooled by the evaporator 5 is first cooled by the second evaporator 5b and then cooled by the first evaporator 5a. The evaporator 5 is preferably provided with a fan 12 that blows air from the second evaporator 5b toward the first evaporator 5a in order to cool the outside air efficiently by the evaporator 5.

  Between the compressor 1 and the condenser 2, an oil separator 8 for separating the lubricating oil of the compressor 1 from the refrigerant is provided. The oil separator 8 is connected to a first flow path P and a second flow path Q, which are flow paths for separated refrigerant.

  The first flow path P is a flow path connecting the oil separator 8 and the refrigerant pipe B, and at least a part of the lubricating oil separated by the oil separator 8 passes through the first flow path P and is a refrigerant pipe. B is supplied. The lubricating oil supplied to the refrigerant pipe B through the first flow path P is supplied as a driving flow to the ejector 7 together with the refrigerant supplied from the condenser 2. On the first flow path P, first valve means 9 for adjusting the amount of lubricating oil supplied to the ejector 7 is provided. By controlling the opening degree of the first valve means 9, the lubricating oil is supplied. The supply amount can be adjusted.

  The second flow path Q is a flow path that connects the oil separator 8 and the refrigerant pipe I, and at least part of the lubricating oil separated by the oil separator 8 passes through the second flow path Q and is a refrigerant pipe. I. The lubricating oil supplied to the refrigerant pipe I through the second flow path Q is supplied to the compressor 1 together with the refrigerant supplied from the ejector 7 through the second evaporator 5b. On the 2nd flow path Q, the 2nd valve means 10 which adjusts supply_amount | feed_rate of the lubricating oil supplied to the compressor 1 is provided, and lubricating oil is controlled by controlling the opening degree of the 2nd valve means 10. The supply amount can be adjusted. As the second valve means 10, it is preferable to use an electromagnetic valve that controls the opening and closing of the second flow path Q.

According to the present embodiment, the refrigeration cycle includes the compressor 1 that compresses the refrigerant, the condenser 2 that condenses the refrigerant compressed by the compressor 1, and the refrigerant branched at the branch point S downstream of the condenser 2. and of one expansion valve 4 for (refrigerant pipe B ₁ refrigerant branched to) is expanded and a first evaporator 5a for evaporating the expanded refrigerant in the expansion valve 4 is branched downstream of the branch point S of the condenser 2 other refrigerant (refrigerant branched into refrigerant pipe B ₂₎ as a driving flow was, the refrigerant evaporated in the first evaporator 5a and suction flow is supplied to the compressor 1 by mixing the motive flow and suction flow Provided between the ejector 7, the second evaporator 5 b that evaporates the refrigerant supplied from the ejector 7 to the compressor 1, and the compressor 1 and the condenser 2, and separates the lubricating oil of the compressor 1 from the refrigerant. An oil separator 8 and at least a part of the lubricating oil separated by the oil separator 8 are condensers And the first flow path P to be supplied to the refrigerant pipe B between the ejector 7 and the lubricating oil of the compressor 1 separated by the oil separator 8 is passed through the first flow path P. Thus, it can be supplied to the ejector 7 as a driving flow. Thereby, the flow volume of the drive flow of the ejector 7 increases, and the efficiency of a refrigerating cycle can be improved.

In the present embodiment, the first flow path P is connects the oil separator 8 and the refrigerant pipe B, as shown in FIG. 5, connects the oil separator 8 and the refrigerant pipe B ₂ May be. With this configuration, lubricating oil supplied through the first flow path P ceases to flow into branched at the branch point S to the refrigerant pipe B _1. Therefore, the amount of lubricating oil to be supplied can be reduced.

  Although the embodiment of the refrigeration cycle according to the present invention has been described above, the refrigeration cycle according to the present invention is not limited to this. For example, the opening degree of the first valve means 9 and the second valve means 10 is in the operating state of the refrigeration cycle. It may be configured to be controlled by the control means accordingly. The operating state of the refrigeration cycle includes, but is not limited to, the outside air temperature and the temperature / pressure of the refrigerant in each part of the refrigeration cycle. In addition, the 1st valve means 9 and the 2nd valve means 10 can be selected from well-known valve means, such as a solenoid valve.

  Hereinafter, embodiments of the frozen showcase according to the present invention will be described. This refrigeration showcase includes a refrigeration cycle according to the present invention whose embodiment is shown in FIGS. At least the evaporator 5 is built in the freezer showcase, and the evaporator 5 cools the air in the freezer showcase. The condenser 2 constituting the refrigeration cycle may be installed outdoors in order to efficiently dissipate heat from the refrigerant.

DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Condenser 3 ... Heat exchanger 4 ... 1st expansion valve 5 ... Evaporator 5a ... 1st evaporator 5b ... 2nd evaporator 6 ... 2nd expansion valve 7 ... Ejector 8 ... Oil separator 9 ... 1st valve means 10 ... 2nd valve means 11 ... Gas-liquid separator 12 ... Fan AI ... Refrigerant piping P ... 1st flow path Q ... 2nd flow path S ... Branching point

Claims (8)

A compressor for compressing the refrigerant;
A condenser for condensing the refrigerant compressed by the compressor;
A first expansion valve and a second expansion valve that respectively expand the refrigerant branched downstream of the condenser;
An evaporator for evaporating the refrigerant expanded by the first expansion valve;
A heat exchanger for evaporating the refrigerant expanded by the second expansion valve;
An ejector that supplies the refrigerant evaporated in the heat exchanger as a driving flow, the refrigerant evaporated in the evaporator as a suction flow, and mixes the driving flow and the suction flow to the compressor;
An oil separator that is provided between the compressor and the condenser and separates the lubricating oil of the compressor from the refrigerant;
A first flow path for supplying at least part of the lubricating oil separated by the oil separator to a refrigerant pipe between the heat exchanger and the ejector;
A refrigeration cycle comprising the refrigeration cycle.   The refrigeration cycle according to claim 1, further comprising first valve means for adjusting a supply amount of the lubricating oil on the first flow path.   The second flow path for supplying at least a part of the lubricating oil separated by the oil separator to a refrigerant pipe between the ejector and the compressor is provided. Refrigeration cycle.   The refrigeration cycle according to claim 3, further comprising second valve means for adjusting a supply amount of the lubricating oil on the second flow path.   The refrigeration according to any one of claims 1 to 4, wherein the heat exchanger evaporates the refrigerant expanded by the second expansion valve by heat exchange with the refrigerant condensed by the condenser. cycle.   6. The refrigeration cycle according to claim 5, wherein the heat exchanger evaporates the refrigerant expanded by the second expansion valve by heat exchange with the refrigerant before branching downstream of the condenser.   The said heat exchanger evaporates the refrigerant | coolant expanded by the said 2nd expansion valve by heat exchange with the refrigerant | coolant branched before the said expansion valve and branched by the said 1st expansion valve. 5. The refrigeration cycle according to 5. The refrigeration showcase comprised including the refrigeration cycle of any one of Claims 1-7 .