JP2006017427A - Cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out effective utilization of energy by concurrently or selectively supplying steam and hot water by using condensation exhaust heat recovered from a condensing unit as a heat source, to use a compressor and a cooling tower of smaller scales in the condensing unit, and to reduce device costs and running costs. <P>SOLUTION: The cooling system is provided with the condensing unit 1 connected to a cooling tower 12, and a heat pump type steam/hot water generator 17 heating water supplied to a condensing means by heat of condensation of a refrigerant to supply steam and hot water. A change-over mechanism 20 is provided for changing over water from a condenser 3 in the condensing unit 1 to one or both of the cooling tower 12, and an evaporator in the steam/hot water generator 17, and it is composed such that the condensation exhaust heat can be changed over to one or both of discharge to the atmosphere from the cooling tower, and recovery by the steam/hot water generator. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooling system that uses the condensed exhaust heat of a condensing unit that generates cold as a heat source of a steam / hot water generator.

  Many factories often use cold heat and steam / hot water at the same time.For example, food manufacturing factories use large amounts of cold heat, such as air conditioners, cooling / freezing devices, and refrigerated / refrigerated warehouses. A large amount of low-pressure steam or high-temperature water for sterilization and washing at 90 ° C. or higher is used in the heating process.

  The generation of the cold is generally performed by a cooling device including a compression refrigerant circuit, and the condensing unit of the cooling device releases the heat of condensation of the refrigerant from the cooling tower to the atmosphere as exhaust heat. It has been pointed out that this exhaust heat is the main cause of the heat island phenomenon, and it is required not only from the viewpoint of energy saving but also from the environmental aspect to be able to recover the exhaust heat.

  In addition, the compressor and cooling tower of the condensing unit must be of a performance according to the refrigeration capacity required for the cooling device. Usually, the cooling load is the largest and the cooling water temperature is high. Therefore, sufficient refrigeration capacity must be obtained under the conditions of outside air temperature and humidity during the daytime in summer when the condensation temperature rises. There is a problem that the capacity becomes excessive and both the apparatus cost and the running cost increase.

  In particular, in a freezer cooling device, the load becomes extremely large when the freezer is cooled, so the cooling tower is required to have 1.6 times the heat exchange capacity required during normal operation. A large cooling tower must be provided.

  Various techniques have been conventionally proposed for recovering exhaust heat using a heat pump refrigerant circuit and effectively using it as a heat source for generating steam or hot water (see, for example, Patent Documents 1 to 3). , By reducing the condensation temperature of the cooling device by recovering the condensed exhaust heat from the existing condensing unit, so that the capacity of the compressor and cooling tower in the condensing unit can be reduced Absent.

In addition, an apparatus having a configuration in which both steam and hot water can be generated at the same time using the recovered exhaust heat as a heat source has not been put into practical use.
JP 59-180016 (pages 1 to 5, FIGS. 1 and 2) JP 61-125547 A (pages 1 and 2, FIGS. 1 and 2) JP-A-7-139847 (pages 1 to 4, FIG. 1)

  The present invention can recover the condensed exhaust heat from the existing condensing unit and supply steam and hot water at the same time using this exhaust heat as a heat source, and selectively supply only steam or only hot water by switching the valve. Therefore, it is possible to effectively use energy and provide a cooling system that can reduce the cost of equipment and running by using a small-sized compressor and cooling tower in the condensing unit. The challenge is to make it possible.

  In order to achieve the above object, an apparatus according to the present invention includes a compression refrigerant circuit, a condensing unit that releases condensed exhaust heat in the refrigerant circuit to the atmosphere in a cooling tower, a compression unit, a condensation unit, and an expansion unit. A heat pump steam / hot water generator for supplying steam / hot water by heating water supplied from the outside to the condensing means by the heat of condensation of the refrigerant in the condensing means; A switching mechanism for switching and circulating the water from the condenser in the cooling unit to one or both of the cooling tower and the evaporator in the steam / hot water generator. The structure is such that it can be switched to one or both of the release from the cooling tower to the atmosphere and the recovery by the steam / hot water generator.

  More specifically, one end of the cooling water delivery branch pipe is connected to the middle of the cooling water delivery pipe for sending water from the condenser in the condensing unit to the cooling tower, and the cooling water is supplied from the cooling tower to the condenser. One end of the cooling water supply branch pipe is connected in the middle of the cooling water supply pipe, and the other end of the cooling water delivery branch pipe and the other end of the cooling water supply branch pipe are respectively connected to the water of the evaporator in the steam / hot water generator. A condensing unit or a condensing unit is connected between the condensing unit and the cooling tower at the branch portion between the cooling water delivery pipe and the branch pipe and the branch portion between the cooling water supply pipe and the branch pipe. A condensing unit is provided with a switching mechanism for switching the cooling water between the cooling unit and the steam / hot water generator or between the condensing unit and the cooling tower and the steam / hot water generator. Some as a discharge to the atmosphere from the cooling tower, and configured to be able to maintain the condensing temperature in condensing unit lower switch to either or both of the recovery by steam-heated generator.

  The heat pump steam / warm water generator includes a first condenser and a second condenser in which the condensing means is connected in series to a refrigerant forward pipe, and steam is respectively generated from the first condenser and the second condenser. And the heat pump steam / warm water generator comprises a first condenser and a second condenser in which the condensing means is connected in series with a refrigerant forward pipe, Steam and hot water are supplied simultaneously from the first condenser and the second condenser, respectively, and the compression means is composed of a two-stage compressor on the low-stage side and the high-stage side, and the second condensation An intermediate cooler is provided in the refrigerant forward pipe between the compressor and the expansion valve, and the other end of the gas refrigerant return pipe connected at one end to the gas phase of the intermediate cooler is connected to the discharge of the low-stage compressor. Pressure refrigerant pipe connected between the suction side and the suction side of the high stage compressor An intermediate valve is connected to the intermediate condenser, and an expansion valve for the intermediate cooler and a bypass pipe are provided in the middle of the refrigerant outgoing pipe between the second condenser and the intermediate cooler so that the expansion valve and the bypass pipe are in parallel. In addition, it is closed during the steam supply operation for supplying only steam to the outside, but it is open during the steam / hot water supply operation for supplying both steam and hot water at the same time and for the hot water supply operation for supplying only hot water. A first open / close valve that is open during the steam supply operation and is closed during the steam / hot water supply operation and the hot water supply operation in the middle of the gas refrigerant return pipe. And a second water supply pipe to the second condenser is closed during the steam supply operation, but is opened during the steam / hot water supply operation and the hot water supply operation. The configuration is such that three open / close valves are provided.

  The condensing unit drives the heat pump steam / hot water generator at the time of activation, and the switching mechanism sends the cooling water from the condensing unit to both the cooling tower and the steam / hot water generator. It is configured to be switched as described above.

  Furthermore, water supply control means for controlling the amount of water supplied to the first condenser is provided in the middle of the water supply pipe to the first condenser in the heat pump steam / hot water generator, and the hot water or steam is supplied from the first condenser. Water supply control for controlling the amount of water supplied to the second condenser in the middle of the water supply pipe to the second condenser in the heat pump steam / hot water generator Means for adjusting the amount of water supplied to the second condenser so that the hot water supplied from the second condenser can be adjusted to a required temperature, and the heat pump steam / hot water generator in the heat pump type 2 A water supply control means for controlling the amount of water supplied to the second condenser is provided in the middle of the water supply pipe to the condenser, and the refrigerant pressure in the refrigerant forward pipe is always adjusted by adjusting the amount of water supplied to the second condenser. Maintain below specified pressure There as having the configuration to allow Rukoto.

  The switching mechanism is composed of a three-way control valve, and a high pressure side pressure switch and a low pressure side pressure switch for detecting the high pressure side refrigerant pressure and the low pressure side refrigerant pressure of the condensing unit are connected to a control circuit for controlling the three way control valve. When the refrigerant pressure on the high-pressure side or low-pressure side exceeds a predetermined value, the cooling water from the condensing unit is sent to both the cooling tower and the steam / hot water generator, and the refrigerant pressure drops below a preset value. As a result, the cooling water supply to the cooling tower is gradually reduced.

  Further, a flow meter for detecting the steam supply amount and the hot water supply amount from the steam / hot water generator is connected to the control circuit. When the steam supply amount and the hot water supply amount decrease, cooling from the condensing unit to the cooling tower is performed. The water supply amount is gradually increased, and when the steam / hot water generator is stopped, the entire amount of cooling water can be switched to be sent to the cooling tower.

  According to the present invention, it is possible to supply steam and hot water at the same time or selectively supply steam and hot water using the condensation exhaust heat of the condensing unit. No special configuration or structure is required, and existing equipment that has been used in refrigerators can be used, and the manufacturing cost can be reduced.

In addition, since the condensed exhaust heat of the condensing unit is recovered as a heat source for generating steam and hot water, it is possible to save energy without wastefully releasing the condensed exhaust heat to the atmosphere. In addition, the condensation temperature can be lowered in the condensing unit. Therefore, the compressor and cooling tower in the condensing unit can be reduced in size and power can be reduced, and the apparatus cost and running cost can be reduced. I can expect.
Note that it is possible to reduce the size and power of the cooling water pump that sends cooling water to the cooling tower.

  Further, since the cooling water circulation path to the cooling tower in the condensing unit is a simple configuration that leads to the steam / hot water apparatus, there is a practical advantage that it can be easily applied to the existing condensing unit.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the apparatus according to the present invention will be described below in detail based on specific examples shown in the accompanying drawings.
The condensing unit 1 includes a compressor 2 and a condenser 3, and a refrigerant outgoing pipe 4 from the condenser is connected via an expansion valve 5 to a refrigerant inlet of an evaporator 8 in an air conditioner 7 of a freezer 6 serving as a room to be cooled. The other end of the refrigerant return pipe 9 having one end connected to the refrigerant outlet of the evaporator is connected to the suction side of the compressor 2 of the condensing unit 1.

  The other end of the cooling water delivery pipe 10 whose one end is connected to the cooling water outlet of the condenser 3 of the condensing unit 1 is connected to the water inlet of the outdoor cooling tower 12 via the cooling water pump 11, The other end of the cooling water supply pipe 13 connected at one end to the cooling water inlet is connected to the cooling water inlet of the condenser.

  The condensing unit 1, the air conditioner 7 and the cooling tower 12 described above constitute a cooling device for the freezer 6, and the refrigerant compressed and condensed in the condensing unit 1 is sent to the evaporator 8 through the expansion valve 5. The air in the freezer is cooled and returned to the compressor, and the air cooled by the evaporator is sent out into the freezer by the blower 14.

  Further, the cooling water obtained by cooling and liquefying the high-temperature refrigerant in the condenser is sent to the cooling tower 12 through the cooling water delivery pipe 10, and is cooled by heat exchange with the outside air in the cooling tower and supplied to the condenser.

  In the system of the present invention, one end of each of the cooling water delivery branch pipe 15 and the cooling water supply branch pipe 16 is connected to the cooling water delivery pipe 10 and the cooling water supply pipe 13, respectively. The other end of each is connected to a water inlet 18 and an outlet 19 of an evaporator 30 of a steam / hot water generator 17 which will be described later.

  Further, a branching portion between the cooling water delivery branch pipe 15 and the cooling water delivery pipe 10 and the cooling water supply pipe 13 of the cooling water supply branch pipe 16 is provided between the condensing unit and the cooling tower or between the condensing unit and the steam / A switching mechanism 20 is provided for switching the cooling water to flow between the hot water generator or between the condensing unit and both the cooling tower and the steam / hot water generator.

The switching mechanism 20 is, for example, an on-off valve V ₈ , V ₈ provided in the middle of the delivery pipe 12 closer to the cooling tower than the branch between the cooling water delivery pipe 10 and the branch pipe 15 and in the middle of the cooling water delivery branch pipe, respectively. ₉ and on-off valves V ₁₀ and V ₁₁ provided in the middle of the supply pipe closer to the cooling tower than the branch of the cooling water supply pipe 13 and the branch pipe 16 and in the middle of the cooling water supply branch pipe, respectively. is there.

When the temperature and humidity of the outside air is high and the cooling load becomes large, such as during the daytime in summer, all of the on-off valves V ₈ , V ₉ , V ₁₀ and V ₁₁ are opened to condense the condensing unit. The cooling water heated by the exhaust heat is supplied to both the cooling tower 12 and the evaporator 30 of the steam / hot water generator 17, and the cooling water cooled by the cooling tower and the evaporator is returned to the condensing unit.

Further, when the cooling load is not so large and steam or hot water is not used, the on-off valves V ₈ and V _{10 are} opened and the on-off valves V ₉ and V ₁₁ are closed to raise the temperature from the condensing unit. The cooling water is supplied only to the cooling tower 12.

Further, when the cooling load is not so large and steam or hot water is used, the on-off valves V ₉ and V _{11 are} opened, the on-off valves V ₈ and V ₁₀ are closed, and the temperature rises from the condensing unit. The cooling water is supplied only to the steam / hot water generator 17.

  In addition, when starting a condensing unit that needs to cool the freezer from room temperature to the required low temperature, the steam / hot water generator is driven first, and the condensing unit is the same as when the cooling load is large. The switching mechanism is operated so that the cooling water from the cooling unit is supplied to both the cooling tower 12 and the steam / hot water generator 17.

  In this way, it is possible to sufficiently cope with a temporary load increase at the time of start-up, and smooth start-up can be performed even with a small capacity compressor and cooling tower.

  The above-described switching mechanism 20 may have any configuration as long as it can switch the heating / cooling water from the condensing unit to one of the cooling tower and the steam / hot water generator, or to both of them. For example, an appropriate three-way switching valve may be provided at each branch portion instead of the on-off valve, or a three-way control valve 43 is provided as shown in FIG. 7, and the three-way control valve is controlled by the control circuit 44. In some cases, the refrigerant pressure in the condensing unit 1 can be controlled. Details will be described later.

  Thus, in the steam / hot water generator 17, the other end of the medium pressure refrigerant pipe 22 whose one end is connected to the discharge side of the low-stage compressor 21 is connected to the suction side of the high-stage compressor 23, and The compression means is composed of the low-stage and high-stage compressors.

  The other end of the refrigerant forward pipe 24 having one end connected to the discharge side of the high-stage compressor 23 is a first condenser 25 and a second condenser 26 which are condensing means, an intermediate cooler expansion valve 27, and an intermediate cooler 28. And the other end of the refrigerant return pipe 31 connected to the evaporator 30 via the evaporator expansion valve 29 and having one end connected to the outlet of the evaporator is connected to the suction side of the low-stage compressor 21. Yes.

The intermediate cooler expansion valve 27 in the refrigerant forward pipe 24 is provided with a bypass pipe 32 straddling the expansion valve, and the bypass pipe 32 is provided with a first on-off valve V ₁ described later.

Further, the other end of the gas refrigerant return pipe 33 whose one end is connected to the gas phase of the intermediate cooler 28 is connected to the middle pressure refrigerant pipe 22 and will be described later in the middle of the gas refrigerant return pipe. A second on-off valve V ₂ is provided.

A first water supply pipe 34 is connected to the secondary side inlet of the first condenser 25, and a steam / hot water supply pipe 35 is connected to the outlet, and water supply control is provided in the middle of the first water supply pipe 34. A flow control valve V ₄ as means is provided.

Further, a second water supply pipe 36 is connected to the secondary side inlet of the second condenser 26 and a hot water supply pipe 37 is connected to the outlet, and water supply control is provided in the middle of the second water supply pipe 36. A flow control valve V _{5 serving} as a means and a third on-off valve V ₃ described later are provided.

  As described above, the cooling water delivery branch pipe 15 is connected to the water inlet 18 of the evaporator 30 and the cooling water supply branch pipe 16 is connected to the outlet 19 thereof.

The apparatus of the present invention configured as described above uses, for example, R245fa having a ozone depletion coefficient ODP of zero as a refrigerant and a global warming coefficient GWP of 950, which is the lowest among practical chlorofluorocarbon refrigerants. It is configured to be switched to a steam supply operation, a hot water supply operation, and a steam / hot water supply operation by open / close control of the on-off valves V ₁ , V ₂ , V ₃ , and the operation in the apparatus of the present invention will be described below.

In the steam supply operation mode, the first on-off valve V ₁ and the third on-off valve V ₃ are closed, and the second on-off valve V _{2 is} opened, and discharged from the low-stage compressor 21 as shown in FIG. The refrigerant is further compressed by the high-stage compressor 23, becomes a high-temperature and high-pressure gas refrigerant, flows into the first condenser 5, heats the water from the first water supply pipe 34, generates steam, and the generated steam Is supplied to the outside through a steam / hot water supply pipe 35.

The refrigerant condensed in the first condenser 25 by heat exchange with the water is flowing through the second condenser 26, the third on-off valve V ₃ of the second water supply pipe 36 is closed, with water It flows out from the second condenser without heat exchange.

Since the first on-off valve V ₁ of the bypass pipe 32 is closed, the refrigerant from the second condenser 26 is reduced in pressure by the expansion valve 27, vaporizes, flows into the intermediate cooler 28, and then passes through the intermediate cooler 28. The gas-liquid separated liquid phase refrigerant flows into the evaporator 30 through the expansion valve 29.

The refrigerant sent to the evaporator 30 is depressurized by the expansion valve 29 and takes the heat of the cooling water from the cooling water delivery branch pipe 15, that is, the water heated by the condensation exhaust heat of the condensing unit. And returned to the low-stage compressor 21 by the refrigerant return pipe 31.
The cooling water is cooled by the evaporator 30 and returned to the condensing unit by the cooling water supply branch pipe 15 and the cooling water supply pipe 13.

Thus, the gas refrigerant in the intermediate cooler 28 is returned to the intermediate pressure refrigerant pipe 22 by the gas refrigerant return pipe 33 in which the second on-off valve V ₂ is opened, and without passing through the low stage compressor 21. The refrigerant is sent again from the high stage compressor 23 to the refrigerant forward pipe 24.

By interposing the intercooler as described above, the gas refrigerant is sent again from the high stage compressor 23 to the first and second condensers without passing through the low stage compressor 21, so that the coefficient of performance COP _h can be improved.

By the way, the flow rate adjusting valve V ₄ of the first water supply pipe 34 is for appropriately controlling the water supply amount and the water supply pressure so that steam having a necessary temperature is supplied, and if the flow rate is reduced. The temperature can be adjusted to a low temperature if the temperature is high.

Next, in the steam / hot water supply operation mode in which steam and hot water are supplied simultaneously, the first on-off valve V ₁ and the third on-off valve V _{3 are} opened, and the second on-off valve V ₂ is closed, as shown in FIG. As described above, the refrigerant discharged from the low-stage compressor 21 is further compressed by the high-stage compressor 23, becomes high-temperature and high-pressure gas refrigerant, flows into the first condenser 25, and draws water from the first water supply pipe 34. Steam is generated by heating, and the generated steam is supplied to the outside through a steam / hot water supply pipe 35.

The refrigerant condensed in the first condenser 25 by heat exchange with the water to heat the water from the second water supply pipe 36 flows into the second condenser 26, the third on-off valve V ₃ is opened hot water To generate a liquid refrigerant at a lower temperature.
Hot water generated in the second condenser 26 is supplied to the outside through a hot water supply pipe 37.

The refrigerant from the second condenser 26 flows into the intermediate cooler 28 through the bypass pipe 32 in which the first on-off valve V ₁ is opened, and the liquid refrigerant in the intermediate cooler 28 is the steam supply operation described above. In the same manner as in the mode, the refrigerant flows into the evaporator 30 through the expansion valve 29, and the evaporator 30 collects and vaporizes the heat of the heating / cooling water from the sonoelectric equipment unit and returns it to the low-stage compressor 21. .
That is, in the steam / hot water supply operation mode, the intermediate cooler 28 functions as a liquid receiver.

In the above-described steam-hot water supply operation mode, there is a structure for supplying the steam from the first condenser 25, the water supply amount by the flow rate control valve V _4, the control of water pressure, from the first condenser 5 second In some cases, hot water may be supplied in the same manner as the two condenser 26, and in this case, high temperature water can be supplied from the first condenser 25, and medium temperature water can be supplied from the second condenser 26.

That is, steam / hot water supply is performed by controlling the opening degree of V ₄ of the flow rate control valve while keeping the open / close state of the open / close valves V ₁ , V ₂ , V _{3 in} the same manner as the steam / hot water supply operation mode described above. The operation mode can be switched to the hot water supply operation mode for supplying only hot water.

That is, if the opening degree of the flow rate control valve V ₄ is further increased from the state of the steam / hot water supply operation mode, the steam from the steam / hot water supply pipe 35 can be changed to warm water, and steam / hot water supply is performed. operation mode and hot water supply operation mode is adapted to be able to select in the control of the opening degree of the flow control valve V _4.

The switching of the steam temperature and the steam / hot water from the steam / hot water supply pipe 35 may be performed by adjusting the amount of water supplied to the first condenser 25 as described above. The drive of a water supply pump (not shown) that sends water to the first water supply pipe 34 instead of the valve V ₄ may be controlled.

Further, by controlling the flow rate adjustment valve V ₅ of the second water supply pipe 36, the temperature of the hot water supplied from the hot water supply pipe 37 can be arbitrarily adjusted within a predetermined range, and the flow rate can be reduced. If it is, it can be adjusted to high temperature, and if it is large, it can be adjusted to low temperature.

Further, the refrigerant pressure in the refrigerant forward pipe 24 can be adjusted by controlling the flow rate adjusting valve V _{5. In} this case, the pressure of the high-pressure refrigerant in the refrigerant forward pipe is detected by a sensor (not shown), When the pressure reaches a predetermined upper limit pressure, the amount of water supplied to the second water supply pipe 36 is increased to lower the temperature of the refrigerant, and the pressure rise is suppressed to adjust the pressure of the high-pressure refrigerant within a predetermined range.

The switching of the hot water temperature from the hot water supply pipe 36 and the pressure control of the high-pressure refrigerant are performed in the second condenser 26 in the same manner as in the case of the switching of the steam temperature and the steam and hot water from the steam / hot water supply pipe 35 described above. Since the amount of water to be supplied may be adjusted, the drive of a water supply pump (not shown) that sends water to the second water supply pipe 36 instead of the flow rate adjustment valve V ₅ of this embodiment may be controlled.

  In the apparatus of the above-described embodiment, the liquid refrigerant from the intermediate cooler 28 is directly sent to the evaporator 30 via the expansion valve 29, but like the apparatus of the second embodiment shown in FIG. In addition, a heat exchanger 40 may be provided between the intermediate cooler 28 and the expansion valve 29 to heat the water from the third water supply pipe 41 so that the medium hot water can be sent out from the second hot water supply pipe 32. is there.

In FIG. 6, symbol V ₆ indicates an opening / closing valve, V ₇ indicates a flow rate adjusting valve, and the opening / closing valve V ₆ is opened / closed according to the necessity of taking out the medium temperature water, and the flow rate adjusting valve V ₇ is heat exchanged. This is for controlling the amount of water supplied to the vessel 40 and adjusting the temperature of the medium temperature water.

This is what the second embodiment, although the opening and closing operation of the valve corresponding to the operation mode as device as well as the table of FIG. 3 in the first embodiment is performed, the on-off valve V ₆ is steam supply in FIG. 3 It is opened in an operation mode corresponding to the operation mode, and is closed in principle in the steam / hot water supply operation mode and the hot water supply operation mode.

  That is, in the steam supply operation mode in the first embodiment, heat exchange in the second condenser 26 is not performed, so that heat that can be taken out remains in the refrigerant in the liquid phase of the intermediate cooler 28, and the second In the case of the embodiment, intermediate heat water can be generated in the heat exchanger 40 by the heat of the refrigerant in the liquid phase of the intermediate cooler 28.

Even when the operation corresponding to the steam / warm water supply operation mode and the warm water supply operation mode of the first embodiment is performed in the second embodiment, the on-off valve V ₆ is opened as necessary to perform the operation relatively. It is also possible to take out the medium temperature water having a low temperature.

  FIG. 7 shows a specific example of a cooling system configured so that the ratio of the amount of cooling water sent from the condensing unit 1 to the cooling tower 12 and the steam / hot water generator 17 can be controlled by the three-way control valve 43 serving as a switching mechanism. Is shown.

  Thus, the three-way control valve 43 controls the supply rate of the cooling water in accordance with a command from the control circuit 44. The control circuit 44 includes a high-pressure side pressure switch 45 provided on the high-pressure side refrigerant pipe in the condensing unit 1 and a low-pressure. The low pressure side pressure switch 46 provided on the side refrigerant pipe is connected to the flow meters 47 and 48 provided on the steam / hot water supply pipe 35 and the hot water supply pipe 37 in the steam / hot water generator 17 respectively.

  In the system configured as described above, when the refrigerant pressure on the high pressure side or low pressure side of the condensing unit exceeds a predetermined value, a pressure warning signal is sent to the control circuit 44 from the high pressure side pressure switch 45 or the low pressure side pressure switch. The control circuit controls the three-way control valve 43 so that the cooling water from the condensing unit flows to both the cooling tower 12 and the steam / hot water generator 17.

  In this way, the cooling water is cooled by both the cooling tower and the steam / hot water generator, reducing the condensation temperature in the condensing unit and lowering the refrigerant pressure, preventing the high-pressure side refrigerant pressure from becoming a dangerously high pressure. This can be done (high pressure safety control), and burn-in of the compressor drive motor can be prevented by an increase in the overload of the compressor accompanying an increase in the low-pressure side refrigerant pressure.

  If the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure drop due to the supply of cooling water to the cooling tower 12 and the steam / hot water generator 17, the supply to the cooling tower 12 is gradually reduced, and then only the steam / hot water generator is used. Supply cooling water to

  When the required amount of steam and hot water for the steam / hot water generator 17 is reduced, the control circuit 44 detects that the flow rate of steam and hot water is reduced by a signal from the flow meter, and supplies the cooling water from the condensing unit. When the steam / warm water generator 17 is stopped after flowing into the cooling tower, the entire amount of cooling water is passed through the cooling tower.

  By adopting a configuration in which the flow control is performed by the three-way control valve 43 as described above, the control of the cooling water is controlled to the most appropriate state according to the respective operating conditions of the condensing unit 1 and the steam / hot water generator 17. Can always be operated stably.

The block diagram which shows the Example of the cooling system which concerns on this invention. The block diagram which shows the specific example of a steam and warm water generator. The table | surface which shows the operation mode and the state of an on-off valve in a steam / hot water generator. The block diagram which shows the flow of the refrigerant | coolant in the vapor | steam supply operation | movement of a vapor | steam / hot water generator. The block diagram which shows the flow of the refrigerant | coolant in the steam / hot water supply operation mode of the steam / hot water generator, and the hot water supply operation mode. The block diagram which shows the other example of a steam and warm water generator. The block diagram which shows the other example of a cooling system.

Explanation of symbols

1 Condensing unit
2 Compressor
3 Condenser
4 Refrigerant outbound pipe
5 Expansion valve
6 Freezer
7 Air conditioner
8 Evaporator
DESCRIPTION OF SYMBOLS 9 Refrigerant return pipe 10 Cooling water delivery pipe 11 Cooling water pump 12 Cooling tower 13 Cooling water supply pipe 14 Blower 15 Cooling water delivery branch pipe 16 Cooling water supply branch pipe 17 Steam / hot water generator 18 Water inlet 19 Water outlet 20 Switching mechanism DESCRIPTION OF SYMBOLS 21 Low stage side compressor 22 Medium pressure refrigerant pipe 23 High stage side compressor 24 Refrigerant going pipe 25 1st condenser 26 2nd condenser 27 Expansion valve for intermediate coolers 28 Intermediate cooler 29 Expansion valve for evaporators 30 Evaporator 31 Refrigerant return pipe 32 Bypass pipe 33 Gas refrigerant return pipe 34 First water supply pipe 35 Steam / hot water supply pipe 36 Second water supply pipe 37 Hot water supply pipe 40 Heat exchanger 41 Third water supply pipe 42 Second hot water supply pipe 43 Three-way control valve 44 Control circuit 45 High pressure side pressure switch 46 Low pressure side pressure switch 47, 48 Flowmeter V ₁ , V ₂ , V ₃ , V ₆ , V ₈ , V ₉ , V ₁₀ , V _{11 On-} off valve V ₄ , V ₅ , V ₇ flow control valve

Claims (10)

  A condensing unit that includes a compression refrigerant circuit, and that discharges the condensed exhaust heat in the refrigerant circuit to the atmosphere in the cooling tower, a compression unit, a condensing unit, an expansion valve, and an evaporator are provided in this order. A heat pump type steam / hot water generator for supplying steam / hot water by heating the supplied water with the heat of condensation of the refrigerant in the condensing means, water from the condenser in the condensing unit, the cooling tower, Provided with a switching mechanism for switching to one or both of the evaporators in the steam / hot water generator and circulating the condensed exhaust heat from the condensing unit to the atmosphere from the cooling tower, and by the steam / hot water generator A cooling system configured to be switched to one or both of recovery.   A condensing unit that includes a compression refrigerant circuit, and that discharges the condensed exhaust heat in the refrigerant circuit to the atmosphere in the cooling tower, a compression unit, a condensing unit, an expansion valve, and an evaporator are provided in this order. A heat pump type steam / hot water generator for supplying steam / hot water by heating the supplied water with the condensation heat of the refrigerant in the condensing means, and cooling the water from the condenser in the condensing unit to the cooling tower One end of the cooling water delivery branch pipe is connected to the middle of the water delivery pipe, and one end of the cooling water supply branch pipe is connected to the middle of the cooling water supply pipe for supplying the cooling water from the cooling tower to the condenser. The other end of the delivery branch pipe and the other end of the cooling water supply branch pipe are respectively connected to the water inlet and the outlet of the evaporator in the steam / hot water generator, and the cooling water delivery pipe and the branch pipe are branched. Department and front At the branch of the cooling water supply pipe and the branch pipe, between the condensing unit and the cooling tower, between the condensing unit and the steam / hot water generator, or both the condensing unit and the cooling tower and the steam / hot water generator With a switching mechanism for switching and circulating the cooling water between them, and condensing by exhausting the condensed exhaust heat from the condensing unit to one or both of releasing it from the cooling tower to the atmosphere and collecting it with the steam / hot water generator A cooling system configured so that the condensation temperature in the unit can be kept low.   The heat pump steam / warm water generator comprises a first condenser and a second condenser in which the condensing means is connected in series with a refrigerant forward pipe, and steam and hot water are respectively supplied from the first condenser and the second condenser. The cooling system according to claim 1 or 2, wherein the cooling system is configured to be supplied simultaneously.   The heat pump steam / warm water generator comprises a first condenser and a second condenser in which the condensing means is connected in series with a refrigerant forward pipe, and steam and hot water are respectively supplied from the first condenser and the second condenser. At the same time, and the compression means is composed of a two-stage compressor of a low-stage side and a high-stage side, and a refrigerant forward pipe between the second condenser and the expansion valve is provided. An intermediate cooler is provided, and the other end of the gas refrigerant return pipe having one end connected to the gas phase of the intermediate cooler is connected between the discharge side of the low-stage compressor and the suction side of the high-stage compressor. An intermediate-pressure refrigerant pipe is connected in the middle of the refrigerant outlet pipe between the second condenser and the intermediate cooler, and an expansion valve and a bypass pipe for the intermediate cooler are connected in parallel. The steam supply operation of supplying only steam to the outside to this bypass pipe Is provided with a first on-off valve that is opened during steam / hot water supply operation for supplying both steam and hot water at the same time and hot water supply operation for supplying only hot water. A second open / close valve is provided in the middle of the pipe, which is opened during the steam supply operation but is closed during the steam / hot water supply operation and the hot water supply operation, and further to the second condenser. 3. A third open / close valve that is closed during the steam supply operation but is opened during the steam / hot water supply operation and the hot water supply operation is provided in the water supply pipe of claim 1. Cooling system.   When starting the condensing unit, the heat pump steam / hot water generator is driven, and the switching mechanism is switched to send the cooling water from the condensing unit to both the cooling tower and the steam / hot water generator. The cooling system according to claim 1 or 2, wherein the cooling system is configured as described above.   A water supply control means for controlling the amount of water supplied to the first condenser is provided in the middle of the water supply pipe to the first condenser in the heat pump steam / hot water generator, and the hot water or steam is supplied from the first condenser. The cooling system according to claim 3 or 4, wherein either of them can be selectively supplied.   A water supply control means for controlling the amount of water supplied to the second condenser is provided in the middle of the water supply pipe to the second condenser in the heat pump steam / hot water generator, and the amount of water supplied to the second condenser is controlled. The cooling system according to claim 3 or 4, wherein the hot water supplied from the second condenser can be adjusted to a required temperature by adjustment.   A water supply control means for controlling the amount of water supplied to the second condenser is provided in the middle of the water supply pipe to the second condenser in the heat pump steam / hot water generator, and the amount of water supplied to the second condenser is controlled. The cooling system according to claim 3 or 4, wherein the refrigerant pressure in the refrigerant forward pipe can always be maintained below a predetermined pressure by adjustment.   The switching mechanism is constituted by a three-way control valve, and a high-pressure side pressure switch and a low-pressure side pressure switch for detecting the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the condensing unit are connected to a control circuit that controls the three-way control valve, When the refrigerant pressure on the high-pressure side or low-pressure side exceeds a predetermined value, the cooling water from the condensing unit is sent to both the cooling tower and the steam / hot water generator, and the refrigerant pressure falls below a preset value. The cooling system according to claim 1 or 2, wherein the cooling system is configured to gradually reduce the supply of cooling water to the cooling tower.   The switching mechanism is constituted by a three-way control valve, and a flow meter for detecting the steam supply amount and the hot water supply amount from the steam / hot water generator is connected to a control circuit for controlling the three-way control valve, When the hot water supply amount decreases, the cooling water supply amount from the condensing unit to the cooling tower is gradually increased, and when the steam / hot water generator is stopped, the entire amount of cooling water can be sent to the cooling tower. The cooling system according to claim 1 or 2, wherein the cooling system is configured as described above.

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