JP2002022371A - Heat exchanger for cold water supply and water temperature control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger for cold water supply capable of supplying and discharging cold water at a predetermined temperature, and a water temperature control method thereof. SOLUTION: This heat exchanger for cold water supply is adapted to include a heat exchanger body having a heat transfer tube through which a refrigerant passes and a water flow passage through which water cooled by the foregoing heat transfer tube passes, a freezing cycle system through which the foregoing refrigerant passes is circulated, and system control means for controlling the foregoing freezing cycle system based upon cold water temperature supplied and discharged from the foregoing heat exchanger body. In the cold water supply heat exchanger, the foregoing heat exchanger body is adapted to include a high temperature refrigerant heat transfer tube where the high temperature refrigerant produced in the foregoing freezing cycle system is communicated properly to the foregoing water flow passage, high temperature refrigerant supply means for supplying the high temperature refrigerant to the foregoing high temperature refrigerant heat transfer tube, and high temperature refrigerant supply control means for controlling the supply of the high temperature refrigerant. The temperature of the cold water supplied and discharged is controlled to be kept a predetermined one by cooling the water flowing through the water flow passage of the heat exchanger body with the aid of the low temperature refrigerant and heating the water properly with the aid of the foregoing high temperature refrigerant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chilled water supply heat exchanger for supplying chilled water and a method for controlling the temperature of the chilled water, and more particularly to, for example, a chilled water supply as a water-side heat exchanger of a cooling only chilling unit. The present invention relates to a heat exchanger for water and a method for controlling its water temperature.

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to FIGS. First, in FIG. 19, the figure is a front view (partially transparent) of the water-side heat exchanger main body of the cooling only chilling unit as the heat exchanger for supplying cold water. In the figure, reference numeral 1 denotes a heat exchanger main body formed in a tubular shape, 2 denotes a cold water discharge port supplied and discharged from the heat exchanger main body 1, and 3 denotes a water inlet for introducing water into the heat exchanger main body 1. is there. Reference numeral 4 denotes a refrigerant inlet / outlet mirror cover as a mirror cover covering one circular end face side of the heat exchanger main body 1, and 5 denotes a mirror cover covering the other circular end face side of the heat exchanger main body 1. Of the refrigerant return side mirror lid. Each of the lens covers 4, 5 has a cavity 6, 7 inside thereof (FIG. 1).
0, FIG. 11, FIG. 14, FIG. 16).

[0003] Inside the heat exchanger body 1, a number of heat transfer tubes 8 are arranged in the longitudinal direction of the cylinder with an appropriate gap therebetween, and both ends of each heat transfer tube 8 are connected to the respective ends. It remains open toward the cavities 6, 7 of the mirror covers 4, 5 (FIGS. 12 and 15). Water introduced into the heat exchanger body 1 from the water inlet 3 flows through the gap between the heat transfer tubes 8. That is, the gap between the heat transfer tubes 8 is the flowing water passage 9 through which the water cooled in the heat exchanger main body 1 passes (FIGS. 12 and 15). A coolant flows through the heat transfer tube 8, and the coolant is cooled by heat exchange in which the coolant removes heat of the water flowing through the water passage 9 by evaporation. Heat transfer tube 8 where this heat exchange is performed
A copper tube is the best.

[0004] In FIG.
Are provided with a refrigerant inlet 10 through which a low-temperature refrigerant is introduced from a refrigeration cycle system pipe line (not shown), and a refrigerant outlet 11 through which the refrigerant that has undergone heat exchange flows. A partition plate 12 is provided inside the mirror cover 4 to partition the hollow portion 6 up and down. The partition plate 12 allows the refrigerant introduced into the inside of the mirror cover 4 to pass through the heat transfer tube 8 and the mirror cover. The heat-exchanged refrigerant that has returned inside 4 is separated so as not to mix. The low-temperature refrigerant that has flowed into the heat transfer tube 8 gradually rises in temperature by heat exchange while flowing inside the heat transfer tube 8, becomes a gaseous low-temperature refrigerant while evaporating, and flows out to the refrigerant outlet 11.

FIG. 12 shows one end face of the heat exchanger body 1.
In this example, it is an entrance / exit-side end face facing the refrigerant entrance / exit mirror cover 4 side, and end openings of many heat transfer tubes 8 are open. As can be seen from the figure, a large number of heat transfer tubes 8 in a state of being bundled with an appropriate gap therebetween are divided into upper and lower groups (hereinafter, also referred to as heat transfer tube groups), and the lower half of the end face concerned. The side is the inlet side of the low-temperature refrigerant, and the upper half is the outlet side of the low-temperature refrigerant.

Referring again to FIG. 14, the inlet / outlet mirror lid 4 has the partition plate 12 as described above.
2, the end of the heat transfer tube 8 on the lower half side of the inlet / outlet side end surface of the heat exchanger body 1 is used as the refrigerant inlet, and the heat transfer tube 8 on the upper half is used.
Is divided as an outlet so that the flow path of the refrigerant into and out of the heat transfer tube 8 in the cavity 6 of the mirror cover 4 is vertically divided. In FIG. 13, reference numeral 13 denotes a packing addressed to the end face of the heat exchanger main body 1. The refrigerant inlet / outlet lid 4 is sandwiched between the refrigerant inlet / outlet lid 13 and the heat exchanger main body 1.
It is airtightly mounted on the end face side of.

Referring again to FIG. 19, water introduced into the heat exchanger main body 1 through the water inlet 3 and flowing through the water passage 9 performs heat exchange while flowing along the heat transfer tube 8, that is, heat is transferred to the refrigerant. It flows while being robbed, and is supplied and discharged from the cold water discharge port 2. A baffle plate 14 is disposed at an appropriate position in the flowing water channel 9 to improve the heat transfer efficiency, and the efficiency of the flow is improved by imparting a stirring characteristic to the flow of water.

[0008] The low-temperature refrigerant supplied from the refrigeration cycle system is introduced into the space below the cavity 6 through the refrigerant inlet 10 of the heat exchanger main body 1 and is located below the end face of the heat exchanger main body 1 shown in FIG. The heat is split and flows into a large number of heat transfer tubes 8 opened in half, in this example, 18 copper tubes, and once collects in the cavity 7 of the refrigerant return mirror cover 5 at the other end of the heat exchanger body 1. The refrigerant once collected in the cavity 7 is
To the heat exchanger tube group, that is, a large number of heat exchanger tubes 8 which open to the upper half side of the end face of the heat exchanger body 1, flow again, and further perform heat exchange. ) And flows out through the upper space of the cavity 6 on the other end side of the heat exchanger body 1 so as to be pushed out from the refrigerant outlet 11. The above-described refrigerant return head cover 5 is also hermetically attached to the end surface of the heat exchanger body 1 with the refrigerant return head cover side packing 15 in the form shown in FIG.

Due to the flow of the water and the refrigerant as described above, the water introduced from the water inlet 3 shown in FIG. 19 flows through the water passage 9 of the heat exchanger body 1 toward the cold water outlet 2. Cooled in between. It is desirable that the cold water supplied and drained from the heat exchanger body 1 be maintained at a predetermined temperature. For this reason, a water temperature detecting sensor 16 as an outlet water temperature detecting means is disposed at the chilled water discharge port 2 to detect the temperature of the chilled water to be supplied and discharged, and to keep the temperature of the chilled water constant by the conventional temperature control means described later. I try to keep it. In addition, the above-mentioned water is not limited to simple water, and may be a wide liquid.
For example, it may be a fluid brine.

The conventional temperature control means based on the detection value of the conventional water temperature detection sensor 16 has been configured as shown in a heat exchanger refrigerant piping system diagram shown in FIG. 2 in the figure
0 is a refrigerant compressor, 21 is a condenser, 22 is a blower motor for the condenser, 23 is a blade, 24 is a control valve for bypassing high-temperature and high-pressure gas, that is, high-temperature refrigerant, and 25 is an expansion valve as a control valve for adjusting the amount of refrigerant. Reference numeral 26 denotes a temperature and pressure sensor for controlling the expansion valve 25. The conventional normal cooling flow is as follows: refrigerant compressor 20 → condenser 21 → expansion valve 25
→ refrigerant inlet 10 → refrigerant outlet 11 → refrigerant compressor 20.

[0011]

In the above-described conventional configuration, if the temperature of the chilled water supplied and discharged from the chilled water outlet 2 is too low, the capacity of the refrigerant compressor 20 is reduced, When the temperature further decreases, the cooling capability is controlled by the high-temperature and high-pressure gas bypass control valve 24. However, with such control,
If the temperature of the discharged cold water further decreases even after performing the above-described suppression control, there is no method other than taking measures other than stopping the thermostat of the refrigerant compressor 20 and waiting for the temperature of the cold water to rise. Therefore, with the conventional structure and control method, the temperature of the cold water to be supplied and discharged cannot be kept constant at a predetermined temperature, and the supply and drainage (supply) of the cold water stops or the water temperature changes up and down. There was a problem that only cold water could be supplied.

In order to solve this problem, a method of stabilizing the temperature of chilled water supplied and discharged by obtaining heat supply from another heat source in the chilled water piping system has been attempted. However, it is necessary to additionally provide a heat exchanger (main body) for exchanging heat.

As described above, the conventional cooling only chilling unit has an unfavorable characteristic that the outlet water temperature of the chilled water changes up and down due to load fluctuation. The following method was proposed. That is, with a constant amount of water supplied to the heat exchanger body, control by peripheral devices, for example,
This is a method of controlling the hot gas bypass in the refrigerant circuit or the capacity of the compressor.

However, in these conventional methods, for example, in a method of controlling with peripheral devices, the load is reduced, or the cooling is stopped when the load is removed, for example, the compressor is stopped. Therefore, a differential (width between ON and 0FF) of the temperature switch is generated, and as a result, there is a problem that the water temperature of the cold water discharge port becomes unstable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat exchanger for supplying chilled water capable of supplying and discharging chilled water at a constant temperature and a method for controlling the temperature of the chilled water.

[0016]

According to a first aspect of the present invention, there is provided a heat exchanger body having a heat transfer tube through which a refrigerant passes and a water passage through which water cooled by the heat transfer tube passes, and a refrigeration cycle in which the refrigerant circulates. A chilled water supply heat exchanger comprising: a system and system control means for controlling the refrigeration cycle system based on the temperature of the chilled water supplied and discharged from the heat exchanger body. A high-temperature refrigerant heat transfer tube through which a high-temperature refrigerant generated in the refrigeration cycle system is appropriately passed; a high-temperature refrigerant supply unit that supplies the high-temperature refrigerant to the high-temperature refrigerant heat transfer tube; and a high-temperature refrigerant that controls the supply of the high-temperature refrigerant. And a refrigerant supply control means.

According to a second aspect of the present invention, in the chilled water supply heat exchanger according to the first aspect, the high-temperature refrigerant supply control means includes a detection signal from an outlet temperature detection means for detecting a temperature of the supplied and discharged chilled water. The supply of the high-temperature refrigerant is controlled based on this.

The invention according to claim 3 is the invention according to claim 1 or claim 2.
In the heat exchanger for cold water supply according to any one of the above, the heat exchanger body is a high-temperature refrigerant supply pipe line that guides the high-temperature refrigerant generated in the refrigeration cycle system to the high-temperature refrigerant heat transfer tube, and the high-temperature refrigerant heat transfer tube. A return line for returning the supplied and condensed refrigerant to the refrigeration cycle system.

The invention of claim 4 is the invention of claims 1 to 3
In the chilled water supply heat exchanger according to any one of the above, the high-temperature refrigerant supply means is a high-temperature refrigerant branch line branched from a line in which the high-temperature refrigerant is generated in the refrigeration cycle system and connected to the heat exchanger body. A high-temperature refrigerant heat transfer tube through which the high-temperature refrigerant disposed in the heat exchanger main body passes, and a normal-temperature refrigerant flowing out of the high-temperature refrigerant heat transfer tube by being deprived of heat from the high-temperature refrigerant heat transfer tube. And a return pipe connected to return to the road.

The invention according to claim 5 is the invention according to claims 1 to 4.
In the chilled water supply heat exchanger according to any one of the above, the heat exchanger main body is provided with a partition plate provided on each of the mirror lids disposed at both ends of the heat transfer tubes disposed inside the main body. The heat transfer tubes are characterized in that the heat transfer tubes are divided into a heat transfer tube group for low-temperature refrigerant and a heat transfer tube for high-temperature refrigerant.

According to a sixth aspect of the present invention, there is provided a heat exchanger body having a heat transfer tube through which a refrigerant passes and a water passage through which water cooled by the heat transfer tube passes; a refrigeration cycle system in which the refrigerant circulates; A water temperature control method for a chilled water supply heat exchanger that controls the chilled water temperature to a predetermined temperature by system control means that controls the refrigeration cycle system based on the chilled water temperature supplied and discharged from the vessel body. A heat exchanger body internally provided with a low-temperature refrigerant heat transfer tube group through which the supplied low-temperature refrigerant passes, and a high-temperature refrigerant heat transfer tube group through which the high-temperature refrigerant generated in the refrigeration cycle system is introduced. By cooling the water flowing through the flow passage of the heat exchanger body with the low-temperature refrigerant, and appropriately heating the water with the high-temperature refrigerant, And controlling the temperature of the cold water supplied discharged constant.

According to a seventh aspect of the present invention, there is provided the first and second aspects of the present invention.
In the heat exchanger for supplying chilled water according to any one of claims 3 and 5, in place of the high-temperature refrigerant generated in the refrigeration cycle system, passing another external heat medium through the heat transfer tube for high-temperature refrigerant. Features.

According to an eighth aspect of the present invention, in the water temperature control method for a chilled water supply heat exchanger according to the sixth aspect, instead of the high temperature refrigerant generated in the refrigeration cycle system, another external heat medium is replaced with the high temperature refrigerant. It is characterized in that it passes through a heat transfer tube.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1
A heat exchanger body having a heat transfer tube through which the refrigerant passes and a water passage through which water cooled by the heat transfer tube passes; a refrigeration cycle system in which the refrigerant circulates; and a temperature of cold water supplied and discharged from the heat exchanger body. A heat control unit for controlling the refrigeration cycle system based on the refrigeration cycle system, wherein the high-temperature refrigerant generated in the refrigeration cycle system is appropriately passed through the water passage in the heat exchanger body. The heat transfer pipe for high temperature refrigerant, high temperature refrigerant supply means for supplying high temperature refrigerant to the heat transfer pipe for high temperature refrigerant, and high temperature refrigerant supply control means for controlling the supply of the high temperature refrigerant are provided.

The first embodiment will be described below with reference to FIGS. FIG. 1 is a front view of a heat exchanger body, and FIG.
3 is a plan view of the heat exchanger main body, FIG. 3 is a diagram of the heat exchanger refrigerant piping system, FIG. 4 is a rear view of the high-temperature refrigerant inlet / outlet head lid, FIG. 7 is a rear view of the low-temperature refrigerant head, FIG. 8 is a front view of the low-temperature refrigerant lid side packing, and FIG. 9 is a perspective view of the low-temperature refrigerant lid. Note that the same reference numerals as those shown in FIGS. 10 to 19 have the same contents, and thus description thereof will be omitted.

In FIG. 1, reference numeral 70 denotes a low-temperature refrigerant inlet / outlet head cover, which has a hollow portion 71 inside thereof.
It is attached to one end of the cylindrical heat exchanger body 1 so as to hermetically cover the circular end face of the heat exchanger body 1. The low-temperature refrigerant entrance / exit head cover 70 is hermetically attached to the end face of the heat exchanger main body 1 via the packing 76 on the low-temperature refrigerant entrance / exit head cover 70 side shown in FIG. The heat transfer tube 8 in the heat exchanger body 1 is connected to the low-temperature refrigerant inlet / outlet lid 70.
A low-temperature refrigerant inlet 71 through which low-temperature refrigerant is introduced and a low-temperature refrigerant outlet 72 through which heat exchange between water and gasified low-temperature superheated refrigerant is recovered.

Next, the structure of the low-temperature refrigerant inlet / outlet head cover 70 will be described with reference to FIGS. In the drawing, the hollow portion 71 of the low-temperature refrigerant inlet / outlet lid 70 is divided into left and right halves by a partition plate 74 provided in the vertical diametric direction, and one of the right and left divided by the left and right partition plate 74 is shown. In the example, the left half cavity portion 71 is further divided vertically by a partition plate 75 provided in the horizontal radial direction. Partition plate 75
A low-temperature refrigerant inlet 72 is opened on the lower side, and a low-temperature refrigerant outlet 73 is opened on the upper side. Also, as shown in FIG. 8, the low-temperature refrigerant entrance / exit mirror lid side packing 76 is formed in a form corresponding to the arrangement structure of the partition plates 74 and 75 of the low-temperature refrigerant entrance / exit mirror 70. The low-temperature refrigerant entrance / exit head cover 70 and the low-temperature refrigerant entrance / exit head cover-side packing 76 thus formed are attached to one end surface of the heat exchanger body 1.

With this mounting, the low-temperature refrigerant inlet 72
Looking at the end face of the heat exchanger main body 1 from the direction of the low-temperature refrigerant outlet 73, the low-temperature refrigerant supplied from the refrigerant cycle is introduced from the low-temperature refrigerant inlet 72 into the cavity 71 of the low-temperature refrigerant inlet / outlet mirror 70. The heat flows into a large number of heat transfer tubes 8 opened in the hollow portion 71 in the lower right region corresponding to １ ／, and flows toward the other end of the heat exchanger body 1. In the middle of this flow, the low-temperature superheated refrigerant gasified by heat exchange flows out from the openings of the plurality of heat transfer tubes 8 opened in the cavity 71 in the upper right region corresponding to １ ／ of the end face. The refrigerant flowing out is returned to the refrigeration cycle system (FIG. 3). The configuration of the flow path of the refrigerant at the other end of the heat exchanger body 1 will be described later.

Next, the other end side of the heat exchanger body 1, that is,
The configuration of the high-temperature refrigerant entrance / exit lid 80 located on the opposite side of the low-temperature refrigerant entrance / exit lid 70 will be described with reference to FIGS. In the figure, similar to the low-temperature refrigerant entrance / exit mirror 7 described above,
The hollow portion 81 of the high-temperature refrigerant inlet / outlet lid 80, which is configured to hermetically cover the circular end face of the heat exchanger main body 1 through a moderate space, that is, the hollow portion 81, also in the vertical diametric direction. It is divided into left and right halves by a provided partition plate 84.

Of the left and right cavities 81 partitioned by the partition plate 84, the side opposed to one of the left and right half surfaces which is not vertically partitioned in the low-temperature refrigerant inlet / outlet mirror 70, the right side in the illustrated example. A half cavity portion 81 is further divided vertically by a partition plate 85 provided in a horizontal radial direction, and a high-temperature refrigerant inlet 82 is provided in a lower cavity portion 81 divided by the upper and lower partition plates 85, The upper cavity portion 81 is provided with a high-temperature refrigerant outlet 83. The high-temperature refrigerant entrance / exit mirror lid side packing 86 is also formed in a form corresponding to the arrangement structure of the partition plates 84 and 85 of the high-temperature refrigerant entrance / exit mirror 80 as shown in FIG.

The high-temperature refrigerant inlet / outlet head lid 80 and the high-temperature refrigerant inlet / outlet head lid-side packing 86 thus formed are connected to the other end face of the heat exchanger body 1, that is, like the one end face described above.
A large number of heat transfer tubes 8 are hermetically attached to the end face of the heat exchanger main body 1, which is arranged so as to be bundled in a cylindrical body, with an appropriate interval as a flowing water passage 9 through which water passes.

As described above, the high-temperature refrigerant inlet / outlet lid 80 is provided at the other end of the heat exchanger body 1 so that the high-pressure high-temperature refrigerant, which has not been available in the prior art, can be supplied to the high-temperature refrigerant inlet 82 and the high-temperature When viewed from the direction of the refrigerant outlet 83, the heat is supplied from a large number of the heat transfer tubes 8 opening to the hollow portion 81 on the upper right half side, and heat exchange is performed in the middle of the flow to give heat to the water flowing through the flowing water channel 9. The high-temperature refrigerant that has lost heat and has become room temperature flows out from the large number of heat transfer tubes 8 that are open to the cavity 81 in the lower right half, and flows into the cavity 81.

In FIG. 2, the figure is a plan view of the heat exchanger body 1 and includes partitions provided inside the low-temperature refrigerant inlet / outlet head cover 70 and the high-temperature refrigerant inlet / outlet head cover 80, respectively. Each of the mirror covers 7 is
The airtightness of each of the hollow portions 71 and 81 divided into right and left inside of 0 and 80 is ensured. As can be seen from the figure, the half-side cavity 81 of the high-temperature refrigerant inlet / outlet lid 80 opposite to the half-side cavity 71 where the low-temperature refrigerant entrance / exit 72, 73 of the low-temperature refrigerant inlet / outlet lid 70 is provided is a half-side without an entrance. And the high-temperature refrigerant ports 82 and 8 of the high-temperature refrigerant port mirror 80.
The half-side cavity 71 of the low-temperature refrigerant entrance / exit lid 70 opposite to the half-side cavity 81 provided with 3 is a half-side without an entrance. As a result, the low-temperature refrigerant introduced from the low-temperature refrigerant inlet 72 at one end of the heat exchanger body 1 and returned to the low-temperature refrigerant outlet 73 and the high-temperature refrigerant outlet 83 introduced from the high-temperature refrigerant inlet 82 at the other end. The flow path with the returning high-temperature refrigerant is distinguished.

In the first embodiment, as described above,
A group of eight heat transfer tubes through which the low-temperature refrigerant supplied from the refrigeration cycle system passes (hereinafter also referred to as a low-temperature refrigerant heat transfer tube);
Similarly, the heat exchanger body 1 integrally includes a heat transfer tube (hereinafter also referred to as a heat transfer tube for high-temperature refrigerant) 8 groups through which a high-temperature refrigerant generated in the refrigeration cycle system is introduced and through which the high-temperature refrigerant passes. In addition, the water flowing through the water passage 9 of the heat exchanger body 1 is cooled by the low-temperature refrigerant to supply and discharge the cold water, and the water flowing through the water passage of the heat exchanger body 1 is heated by appropriately flowing the high-temperature refrigerant. By doing so, the cold water supplied and discharged from the heat exchanger main body 1 can always be kept at a constant temperature.

Referring to FIG. 3, the temperature control of the first embodiment will be described. In the basic refrigeration cycle system, the refrigerant compressed by the refrigerant compressor 20 is condensed in the condenser 21, the refrigerant flow rate is controlled by the expansion valve 25,
After passing through the predetermined heat transfer tube of the heat exchanger body 1, that is, the heat transfer tube for low-temperature refrigerant 8, and performing heat exchange, the refrigerant flows out of the low-temperature refrigerant outlet 73 of the heat exchange body 1 and returns to the refrigerant compressor 20. . Water is introduced from the water inlet 3 and is cooled by heat exchange with a low-temperature medium via the heat transfer tube 8 while flowing through the flowing water channel 9 in the heat exchanger body 1. It is supplied and discharged from the outlet 2.

The temperature control of the chilled water in the normal operation is performed in substantially the same manner as in the prior art by always detecting the temperature of the chilled water supplied and discharged by the water temperature sensor 16 provided as an outlet water temperature detecting means provided at the chilled water discharge port 2. On the basis of the detection signal, the temperature control means controls the temperature of the refrigerant compressor 20 by controlling the capacity of the refrigerant compressor 20 and controlling the thermo-ON / OFF function for preventing the temperature from dropping too much.

In the first embodiment, in addition to the above-described functions, for the purpose of lowering the temperature of the cold water discharged from the cold water discharge port 2 and finely adjusting the temperature, the above-described existing refrigeration cycle system is used. Control valve 11 for high-temperature refrigerant
0, the flow is controlled to a predetermined level through a predetermined heat transfer tube (hereinafter, also referred to as a high-temperature refrigerant heat transfer tube) 8 of the heat exchanger main body 1 by flowing to a flowing water passage 9 in the heat exchanger main body 1. A high-temperature refrigerant supply unit for appropriately heating the flowing water and a high-temperature refrigerant supply control unit are provided. Thereby, the heat exchanger body 1
The cold water of a predetermined water temperature can be supplied and discharged from the cold water discharge port 2 of the first embodiment.

The high-temperature refrigerant supply means is a high-temperature refrigerant branch branched from a pipe in a high-temperature refrigerant passage area where high-temperature refrigerant is generated in the existing refrigeration cycle system and connected to the high-temperature refrigerant inlet 82 of the heat exchanger body 1. The pipe 40 and a predetermined heat transfer tube 8 through which the high-temperature refrigerant flowing from the high-temperature refrigerant inlet 82 passes.
And a high-temperature refrigerant return line 41 for connecting the high-temperature refrigerant flowing out of the high-temperature refrigerant outlet 83, which has been deprived of heat from the heat transfer tube group 8 to the normal temperature, to the normal-temperature refrigerant passage region of the refrigeration cycle system. A control valve 43 provided in the high-temperature refrigerant branch line 41 as a high-temperature refrigerant supply control means, a check valve 44 provided in the return line 42, and a control valve 43 of the high-temperature refrigerant branch line 41. From the downstream side to the liquid-sealing preventing capillary line 45 connected to the line in the room-temperature refrigerant passage area of the refrigerant cycle, and the control valve 43 bypassing the control valve 43.
For preventing liquid sealing, connected to the upstream and downstream sides of the vessel 4
5 and the like. In FIG. 3, reference numeral 46 in the figure denotes a liquid reservoir provided for cushioning since it is predicted that the amount of refrigerant will become unstable.

The high-temperature refrigerant control means (not shown) compares a value of a detection signal from a water temperature sensor 16 as an outlet water temperature detection means with a predetermined temperature value and outputs a comparison value signal. And a control valve 43 or the like as a high-temperature refrigerant supply control unit that is opened and closed based on a comparison value signal from the comparison unit.

The temperature of the discharged cold water is controlled by the high-temperature refrigerant supply means and the high-temperature refrigerant supply control means configured as described above so as to maintain the target value. That is, an appropriate amount of the high-pressure high-temperature refrigerant (high-temperature superheated refrigerant) compressed by the refrigerant compressor 20 flows from the high-temperature refrigerant inlet 82 into the high-temperature refrigerant heat transfer tube 8 of the heat exchanger body 1 via the control valve 43. An appropriate amount of heat is supplied to the water flowing through the water passage 9 in the main body 1. The high-temperature refrigerant, which has been deprived of heat by the heat exchange and has become a normal temperature, condenses and becomes a normal-temperature refrigerant, flows out of the high-temperature refrigerant outlet 83 of the heat exchanger body 1, and flows through the check valve 44.
To return to the expansion valve 25 of the basic refrigeration cycle system.

In order to prevent the high pressure from becoming unstable due to such refrigerant control, the condenser 21
Temperature or pressure is detected by a temperature or pressure sensor 47 provided on the outlet pipe side of the blower motor 22 for the condenser.
The rotation speed of the blades 23 may be appropriately controlled.

According to the first embodiment, in the conventional configuration and control, if the load is reduced, it is necessary to automatically stop the supply and discharge of the cold water to increase the water temperature. In the first embodiment, since the heating capacity exceeding the cooling capacity can be supplied even at the time of the minimum load, constant supply and discharge of the cold water can be always performed without stopping the supply and discharge of the cold water. In addition, since the heat supply to the water in the heat exchanger body by the high-temperature refrigerant can be performed in a stepless manner, the cooling capacity to the water is steplessly controlled from 0% to 100% while detecting the outlet water temperature of the cold water. can do. Further, conventionally, in order to control the outlet water temperature, it is necessary to increase the amount of cold water retained in the chilled water circuit. However, in the first embodiment, the same amount of water as that of a general cooling model can be used.

In the first embodiment, the high-pressure high-temperature refrigerant generated in the existing refrigeration cycle system is introduced into the high-temperature refrigerant heat transfer tube as a heat source for superheating water.
The heat source is not limited to this, and steam or warm water such as well water may be used as another heat source. In this case, it is necessary to appropriately provide a separate pipeline for the heat medium flowing out after the heat exchange from the high-temperature refrigerant heat transfer tube after the heat exchange, as well as the appropriate return pipeline of the first embodiment. In addition, steam heating can be performed by attaching the heat exchanger of the first embodiment to a chilling unit exclusively used for cooling and flowing steam.

[0044]

According to the first to eighth aspects of the present invention,
In any case, cold water at a constant temperature can always be supplied and discharged.

According to the third and fourth aspects of the present invention, since a high-temperature refrigerant generated in an existing refrigeration cycle system is used as a heat source for superheating water, it is necessary to find another heat source for heating. In addition, a simple and inexpensive heat exchanger for supplying cold water can be provided.

According to the fifth aspect of the present invention, the existing heat exchanger body can be used as it is simply by changing the configuration of the mirror lids at both ends, so that it is relatively easy to manufacture and inexpensive cold water supply. A heat exchanger can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of a heat exchanger body.

FIG. 2 is a plan view of a heat exchanger body.

FIG. 3 is a diagram of a refrigerant piping system of a heat exchanger.

FIG. 4 is a rear view of the high-temperature refrigerant inlet / outlet mirror lid;

FIG. 5 is a front view of a high-temperature refrigerant inlet / outlet lid-side packing.

FIG. 6 is a perspective view of a high-temperature refrigerant entrance / exit mirror cover.

FIG. 7 is a rear view of the low-temperature refrigerant head;

FIG. 8 is a front view of the low-temperature refrigerant mirror lid-side packing.

FIG. 9 is a perspective view of a low-temperature refrigerant head;

FIG. 10 is a plan view of a conventional heat exchanger body.

FIG. 11 is a rear view of a conventional low-temperature refrigerant head cover.

FIG. 12 is a front view showing one end face of a conventional heat exchanger body.

FIG. 13 is a front view showing a conventional packing for a refrigerant inlet / outlet lid.

FIG. 14 is a perspective view of a conventional refrigerant inlet / outlet lid.

FIG. 15 is a front view showing the other end face of the conventional heat exchanger body. .

FIG. 16 is a perspective view of a conventional refrigerant return head cover.

FIG. 17 is a front view showing a conventional refrigerant return side mirror cover side packing.

FIG. 18 is a conventional heat exchanger refrigerant piping system diagram.

FIG. 19 is a front view of a conventional heat exchanger.

[Explanation of symbols]

1 heat exchanger body, 2 supply / discharge port, 3 water inlet, 8
Heat transfer tube, 16 cold water mainland detecting means, 40 high temperature refrigerant supply line, 41 return line, 43 high temperature refrigerant supply control means, 44 check valve, 70 low temperature refrigerant lid mirror lid, 72 low temperature refrigerant inlet, 73 low temperature refrigerant outlet, 74,75 divider, 8
0 High-temperature refrigerant head, 82 High-temperature refrigerant inlet, 83 High-temperature refrigerant outlet, 84, 85 Partition plate, 14 Control valve.

Claims (8)

[Claims] 1. A heat exchanger body having a heat transfer tube through which a refrigerant passes and a flow passage through which water cooled by the heat transfer tube passes;
A heat exchanger for supplying cold water, comprising: a refrigeration cycle system in which the refrigerant circulates; and system control means for controlling the refrigeration cycle system based on a temperature of chilled water supplied and discharged from the heat exchanger body. A main body, a high-temperature refrigerant heat transfer tube through which the high-temperature refrigerant generated in the refrigeration cycle system is appropriately passed through the water passage, a high-temperature refrigerant supply means for supplying the high-temperature refrigerant to the high-temperature refrigerant heat transfer tube, A heat exchanger for supplying cold water, comprising: a high-temperature refrigerant supply control means for controlling the supply of the refrigerant. 2. The high-temperature refrigerant supply control means controls the supply of the high-temperature refrigerant based on a detection signal from an outlet temperature detection means for detecting the temperature of the chilled water to be supplied and discharged. Heat exchanger for cold water supply. 3. A high-temperature refrigerant supply pipe for guiding a high-temperature refrigerant generated in a refrigeration cycle system to a high-temperature refrigerant heat transfer tube, and a refrigerant which is condensed by being supplied to the high-temperature refrigerant heat transfer tube. 3. The chilled water supply heat exchanger according to claim 1, further comprising a return pipe returning to the cycle system. 4. A high-temperature refrigerant supply means, comprising: a high-temperature refrigerant branch pipe branched from a pipe in which a high-temperature refrigerant is generated in a refrigeration cycle system and connected to a heat exchanger main body; A high-temperature refrigerant heat transfer tube through which the provided high-temperature refrigerant passes, and a return tube connected to return the normal-temperature refrigerant flowing out of the high-temperature refrigerant heat transfer tube by depriving the heat to the normal-temperature refrigerant passage region of the refrigerant cycle. The chilled water supply heat exchanger according to any one of claims 1 to 3, wherein the heat exchanger is provided with a path. 5. The heat exchanger main body includes a plurality of heat transfer tubes which are disposed at both ends opening sides of the heat transfer tubes disposed inside the main body by a partition plate provided on a mirror lid. The heat exchanger for supplying cold water according to any one of claims 1 to 4, wherein the heat exchanger is configured to be divided into a heat transfer tube group for heat transfer and a heat transfer tube for high temperature refrigerant. 6. A heat exchanger body having a heat transfer tube through which a refrigerant passes and a water passage through which water cooled by the heat transfer tube passes;
A refrigeration cycle system in which the refrigerant circulates, and a system control means for controlling the refrigeration cycle system based on the temperature of the chilled water supplied and discharged from the heat exchanger main body. In the water temperature control method for the exchanger, a low-temperature refrigerant heat transfer tube group through which a low-temperature refrigerant supplied from the refrigeration cycle system passes, and a high-temperature refrigerant heat transfer tube group through which a high-temperature refrigerant generated in the refrigeration cycle system passes are introduced. A heat exchanger main body provided therein is provided, and the low-temperature refrigerant cools the water flowing through the water passage of the heat exchanger main body, and is appropriately supplied and discharged by heating the water with the high-temperature refrigerant. A method for controlling the temperature of a cold water supply heat exchanger, comprising controlling the temperature of cold water to be constant. 7. A high-temperature refrigerant heat transfer tube through which another external heat medium is passed instead of the high-temperature refrigerant generated in the refrigeration cycle system.
Or a heat exchanger for supplying cold water according to claim 5. 8. The chilled water supply heat exchanger according to claim 6, wherein another external heat medium is passed through the high-temperature refrigerant heat transfer tube in place of the high-temperature refrigerant generated in the refrigeration cycle system. Water temperature control method.