WO2017026129A1

WO2017026129A1 - Ammonia refrigeration device

Info

Publication number: WO2017026129A1
Application number: PCT/JP2016/051498
Authority: WO
Inventors: 英敏金尾
Original assignee: 八洋エンジニアリング株式会社
Priority date: 2015-08-10
Filing date: 2016-01-20
Publication date: 2017-02-16
Also published as: JP2017036886A; CN107923660A

Abstract

To provide an ammonia refrigeration device that is smaller and more efficient than a prior-art ammonia-condensing cooling cycle provided with a cooling tower and a cooling water pump. An ammonia refrigeration device (100) characterized in that a primary side ammonia refrigeration cycle (110) has an ammonia-condensing gasket condenser (112) for condensing ammonia, and an ammonia condensing cooling cycle (130) for cooling ammonia using the ammonia-condensing gasket condenser (112) has an evaporative condenser (131) for cooling and liquefying working refrigerant that has been evaporated by the ammonia condensing gasket condenser (112), the working refrigerant being a natural refrigerant or a refrigerant that is not an ozone depleting substance.

Description

Ammonia refrigeration equipment

The present invention comprises a primary-side ammonia refrigeration cycle using ammonia as a refrigerant, and a secondary-side carbon dioxide cooling cycle using carbon dioxide gas cooled by ammonia in the primary-side ammonia refrigeration cycle as a refrigerant. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ammonia refrigeration apparatus that cools a room or the inside of a freezer with an evaporator of a cooling cycle, and particularly relates to an ammonia refrigeration apparatus that cools a refrigerator or a server room.

Conventionally, as an ammonia refrigerating apparatus, a heat pump system is known in which an ammonia cycle using ammonia as a refrigerant and a carbon dioxide cycle using carbon dioxide as a refrigerant are combined and cooled by an evaporator of the carbon dioxide cycle (for example, a patent) Reference 1).

Table 00/050822 (refer to FIG. 1 in particular)

However, since the conventional heat pump system described above has a structure in which gaseous ammonia is cooled to a liquid by cooling water in the condenser of the ammonia cycle, a cooling tower for cooling the cooling water is installed outside the machine room. It was necessary, the power of the cooling water pump was large, the condensation temperature was high, and the efficiency was not sufficient.

Therefore, the present invention solves the problems of the prior art as described above, that is, the object of the present invention is compared with the cooling cycle for ammonia condensation provided with the cooling tower and the cooling water pump of the prior art. To provide an ammonia refrigeration apparatus that is miniaturized and improves efficiency.

The invention according to claim 1 is a method for cooling and liquefying carbon dioxide gas used as a refrigerant for a secondary carbon dioxide cooling cycle in an ammonia evaporation cascade capacitor used as an ammonia evaporator for a primary ammonia refrigeration cycle using ammonia as a refrigerant. The carbon dioxide gas is sent to the carbon dioxide evaporator of the secondary side carbon dioxide cooling cycle, and the carbon dioxide evaporated by cooling the object to be cooled by the carbon dioxide evaporator is returned to the cascade capacitor for ammonia evaporation and cooled and liquefied again. In the ammonia refrigeration apparatus, the primary ammonia refrigeration cycle includes an ammonia condensation cascade condenser that condenses the ammonia, and the ammonia condensation cooling cycle that cools ammonia by the ammonia condensation cascade condenser includes a natural refrigerant or Working refrigerants for non-ozone depleting substances And then, by having the evaporative condenser for cooling and liquefying the working refrigerant evaporated in the ammonia condensing cascade condenser, it is to solve the aforementioned problems.

In addition to the configuration of the ammonia refrigeration apparatus described in claim 1, the invention according to claim 2 is described above because the evaporator condenser is installed above the cascade condenser for ammonia condensation. The problem is further solved.

In addition to the configuration of the ammonia refrigeration apparatus according to claim 1, the invention according to claim 3 is characterized in that the ammonia condensation cooling cycle uses the working refrigerant cooled and liquefied by the evaporative condenser for ammonia condensation. The problem described above is further solved by having the refrigerant liquid pump that forcibly sends the liquid to the cascade capacitor.

In the invention according to claim 4, in addition to the configuration of the ammonia refrigeration apparatus according to any one of claims 1 to 3, the cooling cycle for ammonia condensing operates the operation of the cascade condenser for ammonia condensing. Compressor installed between the refrigerant outlet and the working refrigerant inlet of the evaporator condenser, and the flow rate adjustment installed between the working refrigerant inlet of the cascade condenser for ammonia condensation and the working refrigerant outlet of the evaporator condenser By having the valve, the above-described problems are further solved.

In addition to the configuration of the ammonia refrigeration apparatus according to any one of claims 1 to 4, the invention according to claim 5 is characterized in that the working refrigerant is carbon dioxide gas. It will solve further.

In the invention according to claim 6, in addition to the configuration of the ammonia refrigeration apparatus according to any one of claims 1 to 5, the carbon dioxide evaporator is installed inside a cooler chamber, The primary side ammonia refrigeration cycle is installed in a sealed housing chamber different from the cooler chamber, thereby further solving the above-described problems.

An ammonia refrigeration apparatus according to the present invention includes a primary side ammonia refrigeration cycle using ammonia as a refrigerant, and a secondary side carbon dioxide gas having carbon dioxide gas cooled by the ammonia in the primary side ammonia refrigeration cycle as a refrigerant and having a carbon dioxide evaporator. By providing the cooling cycle, not only the object to be cooled can be cooled by the carbon dioxide vaporizer, but also the following specific effects can be achieved.

According to the ammonia refrigeration apparatus of the first aspect of the present invention, the ammonia condensing cooling cycle for cooling ammonia by the ammonia condensing cascade condenser uses the natural refrigerant or the refrigerant of the non-ozone depleting substance as the working refrigerant, and the ammonia condensing By having an evaporative condenser that cools and liquefies the working refrigerant evaporated in the cascade condenser, the working refrigerant that is sufficiently cooled and condensed in the evaporative condenser takes heat from ammonia and evaporates. Is cooled and the condensation temperature of ammonia is lower than when cooling with cooling water of the prior art, so it is smaller and more efficient than a cooling cycle for ammonia condensation with a cooling tower and cooling water pump of the prior art. Can be better.

According to the ammonia refrigeration apparatus of the invention according to claim 2, in addition to the effect of the invention according to claim 1, the evaporator condenser is installed above the cascade condenser for ammonia condensation, Gas working refrigerant moves down on the cycle path due to difference in specific gravity and liquid head difference between working refrigerant vaporized by cascade condenser for ammonia condensing and working refrigerant liquefied by evaporative condenser Since the refrigerant tends to move upward, the working refrigerant can be circulated without a pump.

According to the ammonia refrigeration apparatus of the invention of claim 3, in addition to the effect of the invention of claim 1, the ammonia condensing cooling cycle converts the working refrigerant cooled and liquefied by the evaporative condenser into ammonia By having a refrigerant liquid pump that forcibly sends the refrigerant to the condenser cascade condenser, a force to circulate the working refrigerant on the cycle path acts, so an evaporator condenser is connected to the ammonia condenser cascade condenser. The installation position can be determined freely.

According to the ammonia refrigeration apparatus of the invention according to claim 4, in addition to the effect exerted by the invention according to any one of claims 1 to 3, the ammonia condensation cooling cycle includes the ammonia condensation cascade capacitor. The flow rate installed between the compressor installed between the working refrigerant outlet and the working refrigerant inlet of the evaporator condenser, and the working refrigerant inlet of the cascade condenser for ammonia condensation and the working refrigerant outlet of the evaporator condenser Operation of the liquid sent to the cascade condenser for ammonia condensing by lowering the pressure on the cascade condenser for ammonia condensing and lowering the temperature on the cascade condenser for ammonia condensing by using the regulating valve Since the temperature of the refrigerant decreases, liquid working refrigerant can be Ammonia can be more cooled to a low temperature sent to Cade capacitor.

According to the ammonia refrigeration apparatus of the invention according to claim 5, in addition to the effect exerted by the invention according to any one of claims 1 to 4, the working refrigerant is carbon dioxide, so that Even if the carbon dioxide gas leaks in the ammonia condensation cooling cycle, safety is ensured because there is no harm to humans.
Further, for example, even when the wet bulb temperature is 27 ° C., the temperature of the carbon dioxide gas in the cooling cycle for ammonia condensation is lowered to a critical temperature of less than 31.1 ° C. at which carbon dioxide gas and liquid exist, and the evaporation Since carbon dioxide is liquefied inside the condenser, ammonia in the primary ammonia refrigeration cycle can be efficiently cooled.

According to the ammonia refrigeration apparatus of the invention according to claim 6, in addition to the effect exerted by the invention according to any one of claims 1 to 5, the carbon dioxide evaporator is installed inside the cooler chamber. Since the primary ammonia refrigeration cycle is installed inside a sealed storage chamber different from the cooler chamber, it is not necessary to take the piping of the primary ammonia refrigeration cycle outside the storage chamber. Even when ammonia is leaked, it is possible to avoid harm to human beings and to eliminate the influence of ammonia on the cooler chamber.
Furthermore, since the piping of the primary ammonia refrigeration cycle is sealed inside the storage chamber, there is no need to place a work chief, so the user can safely operate the ammonia refrigeration apparatus.

The conceptual diagram which shows the ammonia freezing apparatus which is 1st Example of this invention. The figure which shows the temperature and pressure characteristic of a carbon dioxide gas. The conceptual diagram which shows the example of installation of the ammonia freezing apparatus of 1st Example of this invention. FIG. 4 is a conceptual diagram viewed from reference numeral 4-4 shown in FIG. The conceptual diagram seen from the code | symbol 5 shown in FIG. The conceptual diagram which shows the ammonia freezing apparatus which is 2nd Example of this invention. The conceptual diagram which shows the principal part of the ammonia freezing apparatus which is 3rd Example of this invention.

The present invention relates to a primary side ammonia refrigeration cycle using ammonia as a refrigerant, a secondary side carbon dioxide cooling cycle having an evaporator and a carbon dioxide gas cooled by ammonia in the primary side ammonia refrigeration cycle, and a primary side An ammonia refrigerating apparatus combined with an ammonia condensing cooling cycle for cooling ammonia in an ammonia refrigerating cycle, wherein the ammonia condensing cooling cycle serves as a natural refrigerant for cooling ammonia or a working refrigerant as a refrigerant for non-ozone depleting substances. By having an evaporative condenser as a condenser that cools and liquefies, it is smaller and more efficient than a cooling cycle for condensing ammonia with a cooling tower and cooling water pump of the prior art. If so, the specific embodiment is It may be one.

For example, an evaporative condenser cools the refrigerant gas passing through the condenser coil (heat transfer tube) by cooling the condenser coil (heat transfer tube) by removing the latent heat of vaporization due to the vaporization phenomenon of water. Anything is acceptable.
The working refrigerant may be any natural refrigerant or non-ozone depleting substance such as carbon dioxide, ammonia, hydrocarbons such as ethane and butane.

Hereinafter, an ammonia refrigeration apparatus 100 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2, and an installation example of the ammonia refrigeration apparatus 100 according to the first embodiment of the present invention will be described with reference to FIGS. 5 will be described.
Here, FIG. 1 is a conceptual diagram showing an ammonia refrigerating apparatus 100 according to the first embodiment of the present invention, FIG. 2 is a diagram showing temperature / pressure characteristics of carbon dioxide, and FIG. 3 is a diagram showing the present invention. FIG. 4 is a conceptual diagram showing an installation example of the ammonia refrigeration apparatus 100 of the first embodiment, FIG. 4 is a conceptual diagram viewed from reference numeral 4-4 shown in FIG. 3, and FIG. 5 is reference numeral 5 shown in FIG. It is the conceptual diagram seen from.

As shown in FIG. 1, an ammonia refrigeration apparatus 100 according to a first embodiment of the present invention includes a primary ammonia refrigeration cycle 110 using ammonia as a refrigerant, and carbon dioxide gas cooled by ammonia in the primary ammonia refrigeration cycle 110. And a secondary side carbon dioxide cooling cycle 120 using the refrigerant as a refrigerant, and an ammonia condensation cooling cycle 130 for cooling the ammonia in the primary side ammonia refrigerating cycle 110.

Among these, the primary side ammonia refrigeration cycle 110 includes a compressor 111, an ammonia condensing cascade capacitor 112 which is an example of a condenser, an ammonia high pressure receiver 113, an expansion valve 114, and an ammonia low pressure which is also a gas-liquid separator. The liquid receiver 115 includes an ammonia evaporation cascade capacitor 116 which is an example of a capacitor.
The compressor 111 is provided so as to compress gaseous ammonia gas, and when the compressed gaseous ammonia gas passes through the ammonia condensing cascade capacitor 112, the details of the cooling cycle 130 for ammonia condensing described later will be described in detail. It is cooled to liquid by being deprived of heat by liquid carbon dioxide.

The liquefied ammonia is sent to the ammonia high-pressure receiver 113 and further sent to the expansion valve 114.
The expansion valve 114 is configured to depressurize the liquefied ammonia and control the flow rate.
The liquefied ammonia is sent to the ammonia low-pressure receiver 115 via the expansion valve 114 and further sent to the ammonia evaporation cascade capacitor 116.

When the liquefied ammonia passes through the ammonia evaporation cascade condenser 116, it is evaporated by taking heat from the gaseous carbon dioxide in the secondary side carbon dioxide cooling cycle 120, which will be described in detail later, and is converted into a gas. Liquefaction.
Gaseous ammonia gas is sent to the ammonia low-pressure receiver 115 and further sent to the compressor 111 to be compressed again.
The ammonia low-pressure receiver 115 is installed at a position higher than the ammonia evaporating cascade condenser 116, and a liquid head difference of the ammonia medium is formed between them, so that a natural circulation phenomenon using the liquid head difference is caused. As a result, ammonia circulates without a pump.
Further, the primary side ammonia refrigeration cycle 110 is installed inside a sealed storage chamber 140.

The secondary side carbon dioxide cooling cycle 120 includes a carbon dioxide receiver 121, which is also a gas-liquid separator, a carbon dioxide pump 122, and a carbon dioxide evaporator 123, and an ammonia evaporation cascade of the primary side ammonia refrigeration cycle 110. The condenser 116 is combined with the primary ammonia refrigeration cycle 110.
The carbon dioxide gas receiver 121 is configured to receive the liquid carbon dioxide liquefied in the ammonia evaporation cascade capacitor 116.
The liquid carbon dioxide in the carbon dioxide receiver 121 is sent to the carbon dioxide pump 122, and the carbon dioxide pump 122 is provided so as to send the liquid carbon dioxide to the carbon dioxide evaporator 123.

When the liquid carbon dioxide gas passes through the carbon dioxide gas evaporator 123, the liquid carbon dioxide evaporates by removing heat from the air and objects around the carbon dioxide gas evaporator 123 and cools the surrounding air and goods.
The gaseous carbon dioxide gas is sent to the carbon dioxide gas receiver 121 and further sent to the ammonia evaporation cascade capacitor 116.
When the gaseous carbon dioxide gas passes through the ammonia evaporating cascade capacitor 116, the gaseous ammonia is cooled by being deprived of heat by the liquid ammonia and becomes liquid.
In the present embodiment, the carbon dioxide gas as the refrigerant of the secondary side carbon dioxide cooling cycle 120 is carbon dioxide.

The ammonia condensing cooling cycle 130 has an evaporative condenser 131, and is combined with the primary side ammonia refrigerating cycle 110 in the ammonia condensing cascade condenser 112 of the primary side ammonia refrigerating cycle 110.
The evaporative condenser 131 includes a condenser coil 131a, a fan 131b, a pump 131c, an ejection unit 131d, an air inlet 131e, and an air outlet 131f.

Among these, the capacitor coil 131a is provided so that the carbon dioxide gas as a refrigerant may pass inside.
In order to further increase the condensation efficiency, the condenser coil 131a may be inclined with respect to the horizontal direction, the air flow direction, and the injection direction of the injection means 131d so that the internal carbon dioxide gas flows downward.
The piping of the ammonia condensation cooling cycle 130 uses a relatively small diameter pipe because it uses the latent heat of carbon dioxide gas.

The fan 131b is configured to generate an airflow inside the evaporative condenser 131 so that the air flowing in from the air inlet 131e passes through the condenser coil 131a and is discharged from the air outlet 131f.
The pump 131c is provided so as to pump up water stored at the bottom of the evaporative condenser 131 and send it to the upper injection means 131d.
The injection means 131d is provided so as to cool the condenser coil 131a by injecting water sent by the pump 131c toward the condenser coil 131a and taking away latent heat of vaporization due to the vaporization phenomenon.
Thereby, the gaseous carbon dioxide passing through the inside of the capacitor coil 131a is cooled and liquefied.
In addition, the carbon dioxide gas as a refrigerant | coolant of the cooling cycle 130 for ammonia condensation of a present Example is a carbon dioxide.

In the present embodiment, as described above, the ammonia condensing cooling cycle 130 has the evaporative condenser 131 as a condenser that cools and liquefies carbon dioxide gas as a refrigerant.
Thereby, the liquid carbon dioxide gas sufficiently cooled and condensed in the evaporative condenser 131 takes heat from the ammonia and evaporates, and the ammonia is cooled and the ammonia condensing temperature is cooled by the cooling water of the prior art. Compared to lower.
That is, the size is reduced and the efficiency is improved as compared with the cooling cycle for ammonia condensation provided with the cooling tower and the cooling water pump of the prior art.
Further, for example, even when the wet bulb temperature is 27 ° C., as shown in FIG. 2, the carbon dioxide gas of the cooling cycle 130 for ammonia condensation is kept below the critical temperature of 31.1 ° C. at which the gas and liquid of carbon dioxide are present. , The carbon dioxide gas liquefies within the evaporative condenser 131.
That is, the ammonia in the primary side ammonia refrigeration cycle 110 is efficiently cooled.

In the present embodiment, the evaporative condenser 131 is disposed above the ammonia condensing cascade condenser 112.
As a result, the liquid carbon dioxide gas moves downward on the cycle path due to the difference in specific gravity and liquid head difference between the gaseous carbon dioxide vaporized by the ammonia condenser cascade condenser 112 and the liquid carbon dioxide liquefied by the evaporator condenser 131. The gaseous carbon dioxide tries to move upward.
That is, in the ammonia condensation cooling cycle 130, carbon dioxide circulates without a pump.

As shown in FIGS. 3 to 5, the server in the server room SR can be cooled as an example using the ammonia refrigeration apparatus 100.
The evaporative condenser 131, the pump 131c, and the like of the ammonia condensation cooling cycle 130 are installed on the floor or the roof above the server room SR.
The carbon dioxide evaporator 123 and the server rack RK of the secondary carbon dioxide cooling cycle 120 are installed in a server room SR as a cooler room.
Hot aisle HI and cold aisle CI are generated by the arrangement of the server rack RK.

Here, the hot aisle HI refers to a space in which only the exhaust heat of the server is collected in the space of the server room SR divided by the rows of server racks RK and the wall plates WL.
The cold aisle CI refers to a space that collects cold air that is sent from the carbon dioxide evaporator 123 (air conditioner) and sucked by the server.
The hot air of the hot aisle HI rises due to heat convection and flows into the ceiling duct CD, and is sent to the carbon dioxide evaporator 123 by the circulation fan FN.
When the warm air passes through the carbon dioxide evaporator 123, the warm air is cooled by being deprived of heat by the liquid carbon dioxide in the carbon dioxide evaporator 123 and becomes cold air.
The cold air descends due to heat convection, flows into the floor duct FD, is sent to the cold aisle CI, and cools the servers in the server rack RK as objects to be cooled.

In the present embodiment, as described above, the carbon dioxide evaporator 123 is installed inside the server room SR, and the primary ammonia refrigeration cycle 110 is installed inside the sealed accommodation room 140 different from the server room SR. ing.
Thereby, it is not necessary to take out the piping of the primary side ammonia refrigerating cycle 110 to the exterior of the storage chamber 140.
That is, even if ammonia leaks, the generation of harm to humans is avoided, and there is no influence of ammonia on the cooler chamber.
Furthermore, the high-pressure side and low-pressure side pipes of the primary ammonia refrigeration cycle 110 are sealed inside the storage chamber 140, so that it is not necessary to place a work chief.

In addition, when a detection sensor that detects gaseous ammonia gas is installed on the ceiling of the storage chamber 140, an injection unit that injects carbon dioxide gas is installed outside the storage chamber 140, and the detection sensor detects gaseous ammonia gas, A configuration may be adopted in which ammonia gas is moved to the outside of the storage chamber 140 by a duct or the like provided above the storage chamber 140, and the injection means injects carbon dioxide gas.
Thereby, even if ammonia leaks by any chance, the rising gaseous ammonia gas is detected by the detection sensor and neutralized by the injected carbon dioxide gas.

In the ammonia refrigerating apparatus 100 according to the first embodiment of the present invention thus obtained, the ammonia condensing cooling cycle 130 cools the carbon dioxide gas as a natural refrigerant for cooling ammonia or a refrigerant for a non-ozone depleting substance. By having the evaporative condenser 131 as a condenser to be liquefied, it is possible to reduce the size and improve the efficiency as compared with the cooling cycle for condensing ammonia having the cooling tower and the cooling water pump of the prior art. The ammonia in the primary side ammonia refrigeration cycle 110 can be efficiently cooled.

Furthermore, since the evaporative condenser 131 is installed above the ammonia condensing cascade condenser 112, carbon dioxide gas can be circulated without a pump in the ammonia condensing cooling cycle 130.

Further, the carbon dioxide evaporator 123 is installed inside the server room SR as a cooler room, and the primary side ammonia refrigeration cycle 110 is installed inside a sealed housing room 140 different from the server room SR. In the unlikely event that ammonia leaks, the occurrence of harm to human beings can be avoided and the influence of ammonia on the server room SR can be eliminated, so that the user can safely operate the ammonia refrigeration apparatus 100, etc. The effect is enormous.

Next, an ammonia refrigeration apparatus 200 according to the second embodiment of the present invention will be described with reference to FIG.
Here, FIG. 6 is a conceptual diagram showing an ammonia refrigerating apparatus 200 according to the second embodiment of the present invention.
The ammonia refrigeration apparatus 200 of the second embodiment is obtained by changing the installation position of the evaporative condenser 131 of the ammonia refrigeration apparatus 100 of the first embodiment. Since they are common, detailed description of common matters is omitted, and only the reference numbers in the 200s are shared by the last two digits.

As shown in FIG. 6, the ammonia condensing cooling cycle 230 is a refrigerant liquid pump that forcibly sends liquid carbon dioxide to the evaporative condenser 231, the carbon dioxide gas receiver 232, and the ammonia condensing cascade condenser 212. A liquid carbon dioxide pump 233.
The evaporative condenser 231 may be installed at a position lower than the ammonia condensing cascade condenser 212 of the primary ammonia refrigerating cycle 210.

The carbon dioxide gas receiver 232 is configured to receive liquid carbon dioxide gas liquefied by the evaporative condenser 231.
The liquid carbon dioxide pump 233 is provided to forcibly send the liquid carbon dioxide inside the carbon dioxide receiver 232 to the ammonia condensing cascade capacitor 212.
Thereby, the force to circulate with respect to liquid carbon dioxide and gaseous carbon dioxide acts on the cycle path of the ammonia condensation cooling cycle 230.

The ammonia refrigerating apparatus 200 according to the second embodiment of the present invention thus obtained is a refrigerant liquid pump in which the ammonia condensing cooling cycle 230 forcibly sends liquid carbon dioxide gas to the ammonia condensing cascade condenser 212. By including the liquid carbon dioxide pump 233, the position where the evaporator condenser 231 is installed with respect to the ammonia condenser cascade condenser 212 can be freely determined.

Subsequently, an ammonia refrigerating apparatus 300 according to a third embodiment of the present invention will be described with reference to FIG.
Here, FIG. 7 is a conceptual diagram showing a main part of an ammonia refrigerating apparatus 300 according to the third embodiment of the present invention.
The ammonia refrigeration apparatus 300 of the third embodiment is obtained by adding a blower and a flow rate adjusting valve to the ammonia condensing cooling cycle 130 of the ammonia refrigeration apparatus 100 of the first embodiment. Since it is the same as that of the refrigeration apparatus 100, a detailed description of the common items is omitted, and only the reference numbers in the 300s are shared with the last two digits.

As shown in FIG. 7, the cooling cycle 330 for ammonia condensation includes an evaporative condenser 331, a blower 334 as a compressor, a flow rate of liquid carbon dioxide, and a pressure reduction of the liquid carbon dioxide to reduce the pressure of the liquid carbon dioxide. And a flow rate adjusting valve 335 to be sent to the capacitor 312.
The blower 334 is configured to forcibly send the carbon dioxide gas that has become gaseous in the ammonia condensing cascade capacitor 312 of the primary ammonia refrigeration cycle 310 to the evaporative condenser 331.
As a result, the pressure on the ammonia condensing cascade capacitor side with respect to the ammonia condensing cascade capacitor 312 is lowered and the temperature on the ammonia condensing cascade capacitor side is also lowered, so that the temperature of the carbon dioxide gas sent to the ammonia condensing cascade capacitor 312 is reduced. For example, even when the wet bulb temperature in Tokyo in a hot and humid summer is 27 ° C., the temperature of the carbon dioxide gas becomes less than the critical temperature of 31.1 ° C. where the gas and liquid of the carbon dioxide gas exist.

In this embodiment, nothing is provided between the ammonia condensing cascade capacitor 312 and the blower 334 and between the ammonia condensing cascade capacitor 312 and the flow rate adjusting valve 335 on the cycle path. A vessel may be provided.
This gas-liquid separator sends the liquid carbon dioxide gas from the flow rate adjustment valve 335 to the ammonia condensing cascade capacitor 312, separates the returned liquid gas mixed refrigerant, and sends only the gaseous carbon dioxide gas to the blower 334.
Since the blower 334 lowers the pressure and temperature inside the gas-liquid separator, the temperature of the carbon dioxide gas inside the gas-liquid separator is reliably lowered to below the critical temperature of carbon dioxide gas of 31.1 ° C.
A pressure sensor and a temperature sensor are installed inside the gas-liquid separator, and when the value of these sensors reaches a predetermined value based on the critical temperature of carbon dioxide, 31.1 ° C., the blower 334 is driven, When the value is less than the predetermined value, the blower 334 may be controlled to stop.

In the ammonia refrigerating apparatus 300 according to the third embodiment of the present invention thus obtained, the ammonia condensing cooling cycle 330 has the working refrigerant outlet of the ammonia condensing cascade condenser 312 and the working refrigerant inlet of the evaporative condenser 331. And a flow rate adjustment valve 335 installed between the working refrigerant inlet of the ammonia condensing cascade condenser 312 and the working refrigerant outlet of the evaporative condenser 331. As a result, the liquid carbon dioxide gas can be sent to the ammonia condensing cascade capacitor 312 to cool the ammonia to a lower temperature, and the effect is enormous.

100, 200, 300 ...

Ammonia refrigeration equipment

110, 210, 310 ... Primary side

ammonia refrigeration cycle

111, 211 ...

Compressors

112, 212, 312 ... Ammonia condensing

cascade condensers

113, 213 ... Ammonia

high pressure receivers

114, 214 ...

expansion valves

115, 215 ... Ammonia

low pressure receivers

116, 216 ... Ammonia

evaporation cascade capacitors

120, 220 ... Secondary carbon dioxide cooling cycle 121 221 ... Carbon

dioxide gas receivers

122, 222 ... Carbon dioxide pumps 123, 223 ... Carbon dioxide vaporizer (cooler)
130, 230, 330 ... Ammonia

condensation cooling cycles

131, 231, 331 ...

Evaporative condensers

131a, 231a, 331a ... Condenser coils (heat transfer tubes)
131b, 231b, 331b ...

fans

131c, 231c, 331c ...

pumps

131d, 231d, 331d ... injection means 131e, 231e, 331e ...

air inlets

131f, 231f, 331f ... air outlets 232 ... Carbon dioxide gas receiver 233 ... Liquid carbon dioxide pump 334 ... Blower (compressor)
335 ...

Flow control valves

140, 240 ... Storage room SR ... Server room (cooler room)
RK ・・・ Server rack WL ・・・ Wall plate HI ・・・ Hot aisle CI ・・・ Cold aisle CD ・・・ Ceiling duct FN ・・・ Circulation fan FD ・・・ Floor duct

Claims

A carbon dioxide gas used as a refrigerant for a secondary carbon dioxide cooling cycle is cooled and liquefied by a cascade condenser for ammonia evaporation used as an ammonia evaporator in a primary side ammonia refrigerating cycle using ammonia as a refrigerant, and the carbon dioxide gas is converted into a secondary side carbon dioxide gas. In the ammonia refrigerating apparatus, the carbon dioxide gas that is sent to the carbon dioxide evaporator of the cooling cycle and cools and evaporates the object to be cooled by the carbon dioxide evaporator returns to the cascade condenser for ammonia evaporation and is cooled and liquefied again.
The primary ammonia refrigeration cycle has an ammonia condensing cascade condenser for condensing the ammonia;
The ammonia condensing cooling cycle for cooling ammonia with the ammonia condensing cascade condenser uses an natural refrigerant or a non-ozone depleting substance refrigerant as a working refrigerant, and evaporates the working refrigerant evaporated in the ammonia condensing cascade condenser. An ammonia refrigeration apparatus comprising a rate condenser.
The ammonia refrigeration apparatus according to claim 1, wherein the evaporator condenser is disposed above the cascade condenser for ammonia condensation.
The said ammonia condensation cooling cycle has a refrigerant | coolant liquid pump which forcibly sends the working refrigerant | coolant cooled and liquefied by the said evaporator condenser to the cascade condenser for ammonia condensation. Ammonia refrigeration equipment.
The ammonia condensing cooling cycle includes a compressor installed between the working refrigerant outlet of the ammonia condensing cascade condenser and the working refrigerant inlet of the evaporative condenser, and the working refrigerant inlet and evaporator of the ammonia condensing cascade condenser. The ammonia refrigerating apparatus according to any one of claims 1 to 3, further comprising a flow rate adjusting valve installed between the working refrigerant outlet of the reactive condenser.
The ammonia refrigerating apparatus according to any one of claims 1 to 4, wherein the working refrigerant is carbon dioxide gas.
The carbon dioxide evaporator is installed inside the cooler chamber;
The ammonia refrigeration apparatus according to any one of claims 1 to 5, wherein the primary ammonia refrigeration cycle is installed in a sealed housing chamber different from the cooler chamber.