JP2003214732A - Capacity verifying method for refrigerator, and trial run method and trial run device for facility having refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To verify the capacity of a refrigerator by producing the same state as the state where the load of the refrigerator is 100% in simple constitution when in trial run of the refrigerator, the cooling load of the refrigerator is insufficient for various reasons to disable full-load running. <P>SOLUTION: According to a capacity verifying method, a facility is constituted to circulate a heat medium between the refrigerator and a thermal load, and heat taken from a condenser of the refrigerator is given to a return heat medium guided to an evaporator of the refrigerator. A trial run device includes a refrigerator, a cooling tower, a heat using device and a heat exchanger. The evaporator of the refrigerator and the heat using device are connected to each other by a thermal medium pipeline, and the condenser of the refrigerator and the cooling tower are connected to each other by a cooling pipeline. The heat exchanger is used for free cooling, and a cooling water branch pipeline is provided for trial run to introduce cooling water discharged from the condenser as it is into the heat exchanger for free cooling. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating machine capacity verification method as a constituent element of equipment that requires cooling, such as air conditioning equipment, various production equipment, and various storage equipment. Furthermore, the present invention relates to a method and an apparatus for verifying the capacity of a refrigerator after installing the refrigerator. More specifically, the present invention relates to a new technique that utilizes the heat generated by the refrigerator itself and contributes to verification of the capacity of the refrigerator.

[0002]

2. Description of the Related Art Refrigerators for cooling various kinds of heat and maintaining a low temperature are shipped to facilities for their respective uses, but prior to that, they are tentatively inspected at a manufacturer's factory. . However, verification of the capacity of each manufactured refrigerator is left to the manufacturer's voluntary inspection. When it comes to a large refrigerator, the test facility becomes large-scaled, and it is not realistic for the manufacturer to provide a facility that can be operated under a load of 100%. On the other hand, in the equipment for each application where the refrigerator is installed, the heat load change state and usage conditions are not constant, and the planned capacity (cooling capacity) that is actually operated under various conditions after the equipment is constructed It is necessary to verify whether it will come out. As described above, it is general that the facility construction company implements the trial operation in various states after the construction of the facility and takes countermeasures when there is a problem.

Although the refrigerator is handed over to the user through this trial run adjustment, it is difficult to satisfy all the conditions here as well. For example, when performing a trial run of a refrigerator for cooling in the winter (when the load is low), or a refrigerator for cooling the heat generated by the production equipment, only a part of the production equipment is installed at the time of completion (low load). The above-mentioned difficulties are involved when the remaining production equipment scheduled for installation is installed (100% load). However, if the equipment is handed over as it is, it will be found that the capacity will not be obtained after the completion of delivery, and the construction responsibility will be demanded. In Japanese Patent Laid-Open No. 8-136079 as a prior art document, a steam-water heat exchanger is installed as a “simulated load heat exchanger” for test operation during trial run adjustment of an absorption chiller, and a steam provided separately. An invention is disclosed that receives steam from a generator to raise the temperature of the cold return water.

[0004]

[Problems to be Solved by the Invention] At least during the trial run of a refrigerator at the time of completion, it is necessary to make a 100% refrigerator load and verify it to obtain confirmation from the user of the refrigerator. It's also needed from a standpoint. In the above-mentioned Japanese Patent Application Laid-Open No. 8-136079, it is necessary to install a heat exchanger dedicated to the trial run and to lay a dedicated pipe, though it is small in size, which is against the cost saving. There is also a problem that the applicable refrigerator is limited. The object of the present invention is to solve these technical problems.

[0005]

DISCLOSURE OF THE INVENTION The present invention mainly aims to verify the capacity of a refrigerator by supplying warm heat collected from a condenser of the refrigerator to a return heat medium guided to an evaporator of the refrigerator. It is a characteristic. That is, according to claim 1, as a refrigerating machine capacity verification method, equipment is configured so that a heating medium circulates between the refrigerating machine and the heat load, and the heat collected from the condenser of the refrigerating machine is evaporated by the refrigerating machine. A refrigerating machine capacity verification method characterized by verifying the refrigerating machine capacity by giving it to a return heat medium guided to a container.

According to the above configuration, even when the cooling load is insufficient during the test operation, the heat generated from the refrigerator itself can be used to make up for the shortage. And,
No additional heating device is required. The present invention can be applied not only after the refrigerator is installed as a part of the equipment but also before it is delivered to the installation place. That is, since it does not require large-scale equipment, it can also be applied to trial operation in a factory.

According to a second aspect of the present invention, as a test operation method for equipment having a refrigerator, in equipment having a refrigerator and a heat medium circulated between the refrigerator and a heat load, the condenser of the refrigerator is condensed. A test operation method is provided, which is characterized by verifying the capacity of a refrigerator by applying warm heat collected from the refrigerator to a return heat medium introduced to an evaporator of the refrigerator.

Even with the above-mentioned structure, a special heat source for trial operation is not required, and the required maximum cooling load can be covered. Moreover, there is no need to make major changes to the equipment in order to create a state in which the cooling load is increased. At the same time, the degree of freedom in the trial run process is expanded.

A cooling tower is further provided, and after the operation of the equipment after the capacity verification, the cooling heat from at least one of the refrigerator and the cooling tower is supplied to the heat load,
A cooling tower is further provided, and after the facility verification after the capacity verification, the cooling heat from at least one of the refrigerator and the cooling tower is configured to be supplied to the heat load via a pipe,
At the time of verifying the capacity, at least a part of the cooling water circulating between the refrigerator and the cooling tower may be distributed so as to exchange heat with the returning heat medium. For example, at least a part (0% or more and less than 100%) of the cooling water that circulates between the refrigerator and the cooling tower during the actual operation is circulated between the refrigerator and the cooling tower during the test operation. This is because the heat of condensation is larger than the heat of evaporation in the refrigerator, and the cooling tower is used as a heat radiation destination. The cooling tower can be stopped if there is another suitable heat radiation destination, such as when the equipment is equipped with a hot water tank. With this configuration, when heat is applied to the heat medium guided from the refrigerator itself, which is a heat source for cooling load production, to the refrigerator inlet, the heat medium is circulated through the piping system attached to the main cooling tower. Can be carried out. That is, the cooling tower is configured to cool the condenser of the refrigerator in summer after the facility is operated, and to obtain cold heat from the outside air by gas-liquid contact and transmit it to the heat load when the outside air temperature is low such as in winter. At this time, it is possible to adopt an operation mode in which the refrigerator is stopped to save energy (free cooling). By utilizing the piping circuit for this free cooling operation, the modification of the equipment is reduced as much as possible and it contributes to the trial operation with a load of 100%. In principle, the trial run adjustment is performed as a verification at the time of delivery, so it needs to be performed at low cost, but the present invention satisfies this need in that respect.

Further, according to a fourth aspect of the present invention, as a trial operation device for equipment having a refrigerator, a refrigerator, a cooling tower, a heat utilization device and a heat exchanger are provided, and heat is provided between the evaporator and the heat utilization device of the refrigerator. In the medium pipe, the condenser of the refrigerator and the cooling tower are respectively connected by the cooling water pipe, and the heat exchanger exchanges heat between the heat medium and the cooling water. Two sets of branch cooling water pipes branching from the forward pipe and the return pipe of the cooling water pipe are connected to the exchanger so that they can communicate with each other, and one of them does not cool the cooling water discharged from the condenser of the refrigerator. A commissioning device is provided, characterized in that it is a line leading to a heat exchanger.

According to the above construction, it is not necessary to install a special heat source for the trial run, and the equipment for the trial run can be stopped only by installing the branch pipe by making good use of the constituent elements of the facility that is in actual operation. Since branch piping can be installed together with the piping work of the equipment, the amount of work for installation for trial operation can be ignored, and it is possible to present a recipe for effectively using the piping circuit for free cooling for trial operation. To do.

Further, although the branch cooling water pipeline is configured for main operation and trial operation, one branch cooling water pipeline and the other cooling water pipeline may be switchable, or one of them may be cooled. It may bypass the tower. These provide a practical equipment configuration in that they are easy to operate when circulating the heat medium, or that heat can be used without heat loss.

The refrigerator according to the present invention may be any one as long as it has a condenser and an evaporator, and any of volume compression type (reciprocating type and rotary type), centrifugal type and absorption type can be applied to the present invention. . The heat load of the present invention refers to a heat demand part. For example, in an air conditioning application, in addition to a secondary device such as an air conditioner, a heat exchanger that divides the primary side (heat source side) and the secondary side (heat utilization side) may be used. Further, it may be various production equipment, storage equipment or storage equipment for food and other articles, water cooler, and the like. In addition to the device, the pipe may be formed in a coil shape for cooling.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described with reference to FIG. The apparatus illustrated in FIG. 1 includes a turbo refrigerator 1 having an evaporator 1a and a condenser 1b, a cooling tower 2, a cooling water pipe line 4 connecting the condenser 1b of the refrigerator 1 and the cooling tower 2, and refrigeration. It has a heat medium (cold water) conduit 5 connecting between the evaporator 1a of the machine and the heat load. The cooling water pipeline 4 and the heat medium pipeline 5 are provided with a forward pipe and a return pipe, respectively, and a pump is provided on the side guided to the refrigerator 1 (the cooling water forward pipe side, the cold water return pipe side). There is. As a result, the cooling water circulates between the refrigerator and the cooling tower, and the cooling water circulates between the refrigerator and the heat load (for example, heat utilization equipment such as an air conditioner that consumes cold heat).

The apparatus illustrated in FIG. 1 includes a heat exchanger 3 and a cooling tower 2 for cooling tower free cooling operation.
A branch pipe line 6 that connects the heat exchanger 3 and the heat exchanger 3 and a branch pipe line 7 that connects the heat exchanger 3 and the heat medium pipe 5 are provided. Branch line 6
The branch pipe line 7 constitutes a pipe line for free cooling, and the branch pipe line 6 is a branch pipe for the cooling water pipe (main pipe) 4. The branch line 6 is provided with valves on the forward and return pipes. Further, a valve for blocking the return of cold water returning from the heat load to the evaporator 1b of the refrigerator 1 and guiding it to the heat exchanger 3 is attached to the branch pipe line 7. With this configuration, for example, by stopping the refrigerator 1 in winter and opening the valve of the branch pipe line 6 that has been closed until then and closing the valve of the branch pipe line 7, cooling cooled by gas-liquid contact with the outside air is performed. The cold heat of water is transferred to the heat medium flowing through the heat medium pipe 5 via the heat exchanger 3. Thus, the cold water return water as the return heat medium from the heat load obtains the cold heat generated in the cooling tower and is sent to the heat load again. Note that this free cooling operation is described in detail in Japanese Patent No. 1154239 and Japanese Patent No. 3260894, which are applications of the present applicant, and various embodiments other than the embodiments illustrated in the present specification are conceivable.

In the present embodiment, in addition to the above configuration, means for compensating for insufficient heat generation of the heat load by adding the heat of the condenser of the refrigerator to the return heat medium before reaching the refrigerator evaporator during the trial run. Prepare That is, for example, when the heat load is the air-conditioning load, and when the equipment is commissioned in the winter, the cooling medium in the room has a small load, so the circulating heat medium (chilled water) does not obtain the maximum heat load scheduled in the summer. Can not. Also, when the purpose of the equipment is to cool the production equipment of the factory, when the conditions for trial operation with the maximum cooling load applied at the time of completion cannot be established, such as when some of the production installation is not installed for future work. There is. In this embodiment, two sets of branch pipes 6 (6a and 6b) are provided under such conditions, and the branch pipe 6
By adding simple equipment such as b and the valve attached to it, the test operation with 100% load is realized.

That is, valves as open / close valves are attached to the forward and return pipes of the branch pipe 6a and the branch pipe 6b as the cooling water pipes, respectively. Branch pipe 6a for trial operation
The cooling water flow path is closed (valve is closed), and the cooling water flow path of the branch pipe 6b is opened (valve is opened). On the other hand, the refrigerator 1 is operated, and the heat medium cold water is sent from the refrigerator evaporator 1a to the heat utilizing equipment as a heat load. The cold water returned after that did not consume the planned amount of heat. In order to compensate for this, the cooling water to which the refrigerator condenser 1b has given the heat is the return pipe of the cooling water pipe 4 (the return pipe when viewed from the cooling tower) → the branch pipe 6b.
Forward pipe → heat exchanger 3 → return pipe of branch pipe 6b → cooling water pipe 4
And the refrigerator condenser 1b. In the heat exchanger 3, the refrigerating machine evaporator is given a maximum load (100% load) designed by applying heat from the cooling water to the cold return water. In this way, it becomes possible to perform the full operation of the refrigerator under the condition of insufficient heat load and the capability verification at that time, which would not be possible without the present invention.

Reference numeral 9 is a flow rate adjusting valve for trial operation. That is, in the present embodiment, since the heat generated from the refrigerator condenser 1b is sufficient to cover the designed maximum load, not all the cooling water is allowed to flow into the heat exchanger 3 but a part thereof is cooled. Water is sprinkled from to cool. At this time, the operation of the fan of the cooling tower 2 determines whether the operation is possible or not depending on the temperature of the cooling water and the height of the tower. The cooling water after sprinkling merges with the cooling water returning from the branch pipe line 6b and reaches the condenser of the refrigerator. The flow rate adjusting valve 9 need not be an automatic valve, but a manual valve by an operator is sufficient.

As described above, in the operation after the trial run adjustment is completed and the equipment is handed over to the user, in normal operation, the heat of the refrigerator condenser is cooled by the cooling water which comes into gas-liquid contact in the cooling tower. Then, when the outside air temperature is low, the freezing operation is performed in which the refrigerator is stopped and the cold heat of the cooling water from the cooling tower is transmitted to the heat medium in the heat medium conduit. The valves used during the trial run are closed except for the flow rate adjusting valve 9. Reference numeral 10 is a control valve attached to a bypass pipe for adjusting the amount of water sprinkled in the cooling tower, that is, for bleed-in control, in order to supply cooling water of a predetermined temperature to the refrigerator condenser after the equipment is in full operation. It is a control valve. All of the valves shown in FIG. 1 except this valve may be manual on-off valves.

As an example, the temperatures in the main pipelines of the apparatus according to this embodiment are shown below. The designed equipment is planned to send water from the refrigerator evaporator to the air-conditioning equipment as a heat utilization equipment such as an air handling unit and a fan coil unit at 7 ° C and return it at 12 ° C. However, the equipment was completed in winter, so the water was returned at 8 ℃. Therefore, a part of the cooling water of 37 ° C. is guided to the heat exchanger 3 from the refrigerator condenser 1b. Then, the cold water returned to 7 ℃ was 12 as planned.
The temperature can be raised to ° C and supplied to the refrigerator evaporator 1a.
On the other hand, the cooling water after heat exchange with the cold water return water in the heat exchanger 3 is
It merges with the remaining cooling water cooled through the cooling tower and returns from the cooling water pipe 4 to the refrigerator condenser.

Although the embodiment of the present invention has been exemplified above,
For example, the following modifications are possible. For example, although the two-way valves are used for the branch conduit 6a and the branch conduit 6b, respectively, a three-way valve may be used for the confluence. Further, although the branch pipe line 6b is an on-off valve, the flow passage can be opened and closed by a combination of a check valve attached on the discharge side and an intermediate pump. Further, in order to make the return water temperature to the refrigerator evaporator just equal to the designed maximum temperature, instead of restricting the amount of water supplied to the heat exchanger 3 by the flow rate adjusting valve 9, the valve of the branch pipe line 7 is replaced. May be used as an automatic control valve for bleed-in control of cold water return water around the heat exchanger 3. In addition, during the test run, the cooling tower is operated as a heat radiation destination of the residual condensation heat.For example, if there is a hot water tank for hot water supply in the equipment, the residual exhaust heat can be used as an auxiliary heat source by attaching some piping system. It can be used and the operating cost of the cooling tower can be eliminated. In addition, switching of pipelines for cold heat supply to the load (switching between free cooling operation and cold heat supply from the refrigerator) and switching of pipelines during trial operation and actual operation are done by valves. It is also possible to switch the pipelines by providing pumps at appropriate places and stopping pumps in unused pipelines.

[0022]

According to the present invention, the shortage of the cooling load can be compensated for during the trial run without separately providing a heating device, which saves cost and space. In addition, the modification and addition of equipment is minimal, and the effort and time required for the refilling work are insignificant. Moreover, since the refilled part does not interfere with the main equipment, it is not necessary to remove it and there is no need to remove it. No additional heating device is required. Furthermore, from the viewpoint of the installer, the trial operation can be performed regardless of the conditions and conditions at the time of trial operation before completion, and as a result, there is no need to delay the delivery of equipment or perform another trial operation after completion. It is possible to obtain a process with good separation. Compared to the fact that the user of the equipment has not conventionally verified the refrigeration function until the predetermined maximum load arrives, it is safer to attend the performance verification at the time of equipment delivery.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention.

[Explanation of symbols]

1 Refrigerator 1a Refrigerator evaporator 1b Refrigerator condenser 2 Cooling tower 3 Heat exchanger 4 Cooling water conduit 5 Heat medium conduit (cold water conduit) 6 Branch cooling water conduit 6b Out from condenser of refrigerator Pipeline that leads cooling water to the heat exchanger without cooling

Claims (6)

[Claims] 1. A facility is constructed so that a heat medium circulates between a refrigerator and a heat load, and the heat collected from a condenser of the refrigerator is applied to a return heat medium introduced to an evaporator of the refrigerator. ,
A method for verifying the capacity of a refrigerator, characterized by verifying the capacity of the refrigerator. 2. In a facility having a refrigerator and configured so that a heat medium circulates between the refrigerator and the heat load, the heat recovered from the condenser of the refrigerator is returned to the evaporator of the refrigerator. A test operation method for equipment having a refrigerator, characterized in that the capacity of the refrigerator is verified by applying it to a heat medium. 3. A cooling tower is further provided, and cold heat from at least one of the refrigerator and the cooling tower is configured to be supplied to the heat load through a pipe after the facility after the capacity verification is actually operated. The refrigerating machine according to claim 2, wherein at the time of the capacity verification, at least a part of the cooling water circulating between the refrigerating machine and the cooling tower is distributed for heat exchange with the return heat medium. Method of test operation of equipment. 4. A refrigerator, a cooling tower, a heat utilization device, and a heat exchanger are provided, and a heat transfer medium line is provided between the evaporator and the heat utilization device of the refrigerator.
The condenser of the refrigerator and the cooling tower are connected by cooling water pipes, respectively, and the heat exchanger exchanges heat between the heat medium and the cooling water. Two sets of branch cooling water pipes branching from the forward and return pipes of the cooling water pipe are connected so that they can communicate with each other, and one of them leads the cooling water from the condenser of the refrigerator to the heat exchanger without cooling it. A test run device characterized by being a pipeline. 5. The trial run device according to claim 4, wherein one branch cooling water pipeline and the other cooling water pipeline of the two sets of branch cooling water pipelines are switchable. 6. The one of the two sets of branch cooling water pipelines bypasses the cooling tower, and the branch cooling water pipeline is bypassed.
Or the test operation device described in 5.