JP2002115873A - Heat exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange system capable of increasing a temperature difference even when a underground heat source is used, using it for a high purity water using potable water, using in a large quantity at a low cost and obtaining a refrigerant having good thermal efficiency with the high purity water used as the refrigerant. SOLUTION: The heat exchange system heat exchanges by the refrigerant flowing to a circuit between heat exchangers for conducting a thermal work by using the heat source such as a geothermal heat or the like or/and a circuit between the exchanger and an air conditioner. The refrigerant is made in high purity so that the refrigerant can flow even by supercooling a fluid used as the refrigerant. The refrigerant is supplied to the circuit in high purity by treating the potable water to high purity by a high purity treating means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange system using high-purity water as a refrigerant, and more particularly to a heat exchange system suitable for performing a snow melting operation using a heat source such as geothermal heat.

[0002]

2. Description of the Related Art It is conventionally known that underground geothermal heat is used to warm Freon gas or antifreeze and send it to a heat exchanger to economically perform indoor heating and cooling or snow melting. As one example, Japanese Patent Laid-Open No. 5-118700, which is a heat pump type air conditioner using underground heat, has been proposed. According to the publication, a heat pump type air conditioner is
An underground heat exchanger 93 is buried in the underground 91, and a compressor 95, an indoor heat exchanger 97, and an expansion valve 99 are connected to the underground heat exchanger 93 in this order through a pipe 101. This underground heat exchanger 93
A double-tube heat exchanger 93 composed of an outer tube 103 and an inner tube 105 is provided. A refrigerant such as CFC gas flowing into the inner tube 105 from above flows out from under the inner tube and passes through the outer tube 103 and the inner tube 1.
It rises between 05 and absorbs geothermal heat and gasifies. Then, the air is pressurized by the compressor 95 and radiated by the indoor heat exchanger 97 to be heated. The radiated refrigerant passes through the expansion valve 99 and passes through the inner pipe 1.
Return to 05. In cooling, it is compressed by the compressor 95,
It descends inside the outer tube 103, radiates heat to the underground 91 and liquefies, and moves up the inner tube 105. Then, it is adiabatically throttled by the expansion valve 99, enters the indoor heat exchanger 97, cools the room, evaporates, and returns to the compressor 95. In this way, the underground heat exchanger 93 is buried in the underground 91, and the compressor 9 is installed in the underground exchanger 93.
5. By sequentially connecting the indoor heat exchanger 97 and the expansion valve 99, the heat exchange performance is improved and the amount of heat taken is increased.

[0003] In the above-mentioned example, a refrigerant that changes phase is used as the refrigerant. However, there is also a refrigerant that uses an antifreeze liquid that does not change phase to increase the amount of heat taken from the underground heat exchanger.

[0004]

However, the above-mentioned Japanese Patent Application Laid-Open No. 5-118700 discloses an example in which chlorofluorocarbon gas is used as a refrigerant. The use of antifreeze, which is toxic, has a problem of environmental destruction, as does freon gas. In addition, some non-toxic antifreeze liquids are used as refrigerants. However, they are expensive, and in the case of using a large amount of underground heat, there is a problem that the price increases and it is difficult to use. Therefore, it can be used inexpensively and in large quantities,
There is a demand for the development of a heat exchange system that can use a refrigerant having high thermal efficiency.

The present invention focuses on the above conventional problems and relates to a heat exchange system method and a heat exchanger using high-purity water as a refrigerant. In particular, the present invention provides a large temperature difference even when an underground heat source is used. It is possible to provide a heat exchange system using high-purity water as a refrigerant, which can be used for high-purity water using tap water, can be used inexpensively and in large quantities, and can obtain a refrigerant with high thermal efficiency. The purpose is.

[0006]

In order to achieve the above object, a heat exchange system according to the present invention involves a phase change that transfers heat to and from a primary heat exchange circuit involving a phase change of a refrigerant. In a heat exchange system having a secondary heat exchange circuit using no refrigerant, a bypass circuit having a deionized water treatment means provided in the secondary heat exchange circuit, and water of the secondary refrigerant flows through the bypass circuit Then, pure water is circulated to the secondary heat exchange circuit to circulate pure water as a secondary refrigerant. In this case, a flow path switching unit to the bypass circuit is provided, a secondary refrigerant electric conductivity detection sensor is provided, and the flow path switching unit is operated when a detection value by the detection unit becomes equal to or more than a set value. Then, a control means for flowing the secondary refrigerant to the bypass circuit can be provided. Further, it is preferable that a tap water pipe is connected to the bypass circuit.

Further, as another configuration of the present invention, scale and ions generated during operation are removed from water as a secondary refrigerant in a refrigerant circulation path on the heat collecting side of the secondary heat exchange circuit to perform a pure water treatment. Means may be provided to enable heat exchange with the primary refrigerant of the primary heat exchanger.

[0008]

According to the above arrangement, high-purity water that flows even if it is supercooled is used as a refrigerant in a circuit between a heat source and a heat exchanger and / or a circuit between a heat exchanger and an air conditioner. A heat exchange system. For this reason,
The temperature difference between the heat sources of the refrigerant to be heat-exchanged can be increased, and the heat exchange efficiency with the heat pump system using the primary refrigerant with a phase change can be improved. As the refrigerant, water such as tap water is supplied to a pure water treatment means, where impurities are removed from the water to make high-purity water, and then purified water is supplied from a high-purity pressurized water pipe and a return pipe of the circuit. It is sent to a heat exchanger via a sensor that measures the temperature. In the heat exchanger, when it is determined by the pure water sensor that the value is equal to or more than a predetermined value, it flows through the cooling coil, is supercooled, and is cooled to, for example, about -5 ° C. The supercooled high-purity water is sent to an underground heat exchanger buried underground through a cold / hot water pipe connected to a cold water coil. At this time, the high-purity water is sent to the underground heat exchanger while maintaining the fluidity without freezing even if it is supercooled to about 0 ° C. or less. Thereby, high-purity water can flow even if it is supercooled to about −5 ° C. or more, and a large temperature difference from a heat source such as underground heat can be taken.
Thermal efficiency can be improved. The high-purity water sent to the underground heat exchanger is returned from the circulation pump to the heat exchanger via switching means such as a three-way valve and a pure water measurement sensor. When high purity water is circulating in the circuit of the evaporator on the heat source side, if the pure water measurement sensor determines that the value is equal to or less than a predetermined value, the pure water measurement sensor transmits the result to the control means. The control means
A command is output to the three-way valve to switch the flow path to the bypass circuit. As a result, the purified water having a reduced purity is supplied from the return pipe to the pure water treatment means to be purified, and the purified high-purity water is returned to the return pipe of the present circuit via the high-purity pressurized water pipe. As a result, purified high-purity water can be sent to the heat exchanger, and the high-purity water can circulate without freezing even if it is supercooled to about −5 ° C. The temperature difference can be increased and the heat collection efficiency can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a heat exchange system using high-purity water as a refrigerant according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall configuration conceptual diagram of a heat exchange system using high-purity water as a refrigerant according to an embodiment of the present invention.

In FIG. 1, a heat exchange system 1 performs heat exchange by disposing an evaporator 5 on a heat source side and a condenser 7 on an air conditioner side in a heat pump 3 similar to a conventional one. ing. The heat pump 3 is a so-called primary heat exchange system that exchanges heat by phase change of the refrigerant, and the configuration of the heat pump 3 can be set arbitrarily. Since the evaporator 5 and the condenser 7 in the heat pump 3 are switched during cooling and heating, the case of heating will be described first. The dewatering apparatus 13 is connected to the evaporator 5 through a pressurized water pipe 11 for supplying new pressurized water or supplementary pressurized water. The pressurized water pipe 11 is connected to a not-shown water pipe, and the pressurized tap water is supplied to the pure water treatment apparatus 1.
3 as needed. Purification equipment 13
Is a coarse mesh pretreatment filter 15 for removing large contaminants from supplied tap water and the like, and an ion for removing very small contaminants such as fine ions or scales from water from which large contaminants have been removed. Exchange resin 17
And a very fine post-processing filter 19 that is disposed downstream of the ion exchange resin 17 and removes impurities that have not been removed by the ion exchange resin 17. High purity water. Since the tap water is made into high-purity water by the pure water treatment device 13, it can be purified at low cost, and the cost does not increase even when used in large quantities. The ion exchange resin 17 of the pure water treatment apparatus 13 may be formed of an ultrafiltration membrane, a reverse osmosis membrane, or a PV membrane that allows steam obtained by evaporating water to pass therethrough. The provision of the water purification apparatus 13 enables the removal of ions and scales generated during operation at all times. Since the high purity is constantly maintained, the pure water treatment apparatus 13 does not freeze even if it is supercooled. Is kept.

A high-purity pressurized water pipe 11a is connected to the pure water treatment apparatus 13, and the high-purity pressurized water pipe 11a is connected to the high-purity pressurized water pipe 11a.
Is connected to the return pipe 21 of this circuit of the heat exchange system 1 (P
point a). Thus, the high-purity water purified by the pure water treatment apparatus 13 is sent from the high-purity pressurized water pipe 11a to the return pipe 21 of the present circuit. The return pipe 21 is
Heat pump 3, for example, water-cooled heat pump chiller 2
3 and a high-purity water or a pure water treatment apparatus 1 which is returned to the circuit by a water-cooled heat pump chiller 23.
3 supplies high-purity water for replenishment purified. The heat pump 3 includes a water-cooled heat pump chiller 23,
Absorption water coolers, gas heat pumps, compressors, or
Other types of heat exchangers may be used.

The return pipe 21 has a connection point Pa of the high-purity pressurized water pipe 11a and the water-cooled heat pump chiller 2.
A pure water sensor 25 for measuring the purity of the high-purity water for return or replenishment is provided between them. The purity of the high-purity water measured by the pure water sensor 25 is transmitted to the control unit 27. The pure water sensor 25 measures, for example, the electrical conductivity of the flowing medium and detects the purity of the refrigerant according to the resistance value. For example, it is assumed that a predetermined high-purity water is obtained when the resistance value of the electric conductivity becomes equal to or more than a predetermined value. The control unit 27 determines the purity of the high-purity water transmitted from the pure water degree sensor 25, and outputs a command to a three-way valve 53, which will be described later, when the resistance of the electric conductivity falls below a predetermined value. .

The water-cooled heat pump chiller 23 has a coil 31 for cold water disposed inside, and the coil 31 for cold water is connected to the return pipe 21 on the one hand and to the pipe 33 for cold / hot water on the other hand. . In the water-cooled heat pump chiller 23, high-purity water flowing inside the cold water coil 31 is cooled by dropping cold water from the drop tray 35. The temperature of the chilled water that has cooled the chilled water coil 31 rises, and raises the refrigerant flowing through the condensing coil 41 disposed on the opposite side.

The water-cooled heat pump chiller 23 is cooled to about −5 ° C. by the cold water coil 31, and is buried in the underground 43 via the cold / hot water pipe 33 connected to the cold water coil 31. Send high purity water to 45. At this time, in normal water, it becomes ice at about 0 ° C or less and does not flow, but in the present invention, since it is high-purity water, it does not freeze even if it becomes supercooled at about 0 ° C or less, and maintains fluidity. I have. Also,
By supercooling high-purity water to about −5 ° C., the temperature difference from underground heat increases, so that heat absorption is improved and thermal efficiency can be improved.

The underground heat exchanger 45 includes an inner pipe 47 and an inner pipe 4.
The outer pipe 49 is formed of a double pipe of an outer pipe 49 that accommodates the inside 7, and the outer pipe 49 is connected to the cold / hot water pipe 33.
Thereby, the high-purity water sent from the water-cooled heat pump chiller 23 enters the outer tube 49. The high-purity water that has entered the outer tube 49 receives ground heat from outside the outer tube 49 and has a temperature of about 0 ° C.
And flows into the inner tube 47 and flows upward.
The high-purity water that has entered the inner pipe 47 flows through the return pipe 21 connected to the inner pipe 47, and is sucked by the circulating pump 51 provided in the return pipe 21. Although one underground heat exchanger 45 is connected to the cold / hot water pipe 33 in the drawing, a plurality of underground heat exchangers 45 may be connected in parallel to increase the amount of heat absorbed. In addition, the temperature may rise to about 0 ° C. or more due to the underground heat.

The high-purity water sucked and pressurized by the circulation pump 51 is sent to a three-way valve 53 provided in the return pipe 21. The three-way valve 53 includes a return pipe 21 having a first connection port 53a connected to the underground heat exchanger 45 and a return pipe 21 having a second connection port 53b connected to the water-cooled heat pump chiller 23.
And the third connection port 53c is connected to the pressurized water pipe 11. Further, the three-way valve 53 is connected to the control unit 27 and controls the flow of high-purity water according to a command from the control unit 27. When the purity of the high-purity water transmitted from the pure water sensor 25 is equal to or higher than a predetermined value, the control unit 27 causes the three-way valve 5 to flow from the first connection port 53a to the second connection port 53b.
3, the high-purity water from the underground heat exchanger 45 is returned to the water-cooled heat pump chiller 23 as it is. Also,
When the purity of the high-purity water transmitted from the pure water degree sensor 25 is equal to or lower than a predetermined value, the control unit 27 outputs a command for communicating the first connection port 53a and the third connection port 53c to the three-way valve 53 to cause contamination. The purified high-purity water flows into the pure water treatment apparatus 13 and is purified by the pure water treatment apparatus 13, and then the high-purity pressurized water pipe 11a
The purified high-purity water can be sent to the water-cooled heat pump chiller 23 because it is returned to the return pipe 21 of the circuit through the above, and high-purity water that can be supercooled to about 0 ° C. or less and does not freeze is circulated. Can be. As described above, the water-cooled heat pump chiller 23 and the underground heat exchanger 45 are connected by the cold / hot water pipe 33 and the return pipe 21 to form a main circuit on the heat source side through which the refrigerant flows. Also, return pipe 21
Is connected to a high-purity pressurized water pipe 11a, and is supplied with high-purity water purified by the pure water treatment apparatus 13.

Next, the air conditioner 61 connected to the condenser 7 will be described. In the heat exchange system 1 of the present invention,
Since the air conditioner 61 of the present invention has substantially the same configuration as the evaporator 5 on the heat source side, the same components are denoted by the same reference numerals and description thereof is omitted.

The air conditioner 61 includes an air conditioning pipe 6 in the condenser 7.
3 is connected, and a pure water storage tank 65, a circulation pump 51, a three-way valve 53, a pure water degree sensor 2
5, and an air conditioner 67 are sequentially arranged. Also,
An air conditioning return pipe 69 is connected between the air conditioner 67 and the condenser 7. Further, similarly to the heat source side, a controller 27 is connected to the pure water sensor 25, and the pure water sensor 2
The purity of the high-purity water measured in 5 is transmitted to the control unit 27. The control unit 27 determines the purity of the high-purity water transmitted from the pure water sensor 25, and outputs a command to the three-way valve 53 when the purity falls below a predetermined value. The air conditioning pipe 63 is provided with the pure water content sensor 25 and the air conditioner 6 in the same manner as described above.
7 is connected to a pressurized water pipe 11 for supplying new pressurized water or supplementary pressurized water from the pure water treatment apparatus 13 at a point (Pb). As described above, the water-cooled heat pump chiller 23 and the air conditioner 67 are connected by the air-conditioning pipe 63 and the air-conditioning return pipe 69 to form the main circuit on the air-conditioning equipment 61 side through which the refrigerant flows.

In the above configuration, the condensing coil 41 is provided inside the condenser 7, and the condensing coil 41 is provided.
Is connected to the air-conditioning pipe 63 on the one hand and to the air-conditioning return pipe 69 on the other hand. During heating, the water-cooled heat pump chiller 23 drops hot water from the drop tray 71 to warm the high-purity water flowing inside the condensing coil 41. The temperature of the chilled water that has cooled the chilled water coil 31 increases, and the condensing coil 41 disposed on the opposite side is cooled.
The refrigerant flowing inside is rising.

The water-cooled heat pump chiller 23 raises the temperature of the condenser coil 41 to about 35 ° C.
High-purity water is sent to the air conditioner 67 via the air-conditioning pipe 63 connected to 1. In the air conditioner 67, the temperature of the indoor air is raised, the temperature of the high-purity water is reduced to about 30 ° C., and the air returns to the water-cooled heat pump chiller 23 via the return pipe 69 for air conditioning.

In the above, on the contrary, at the time of cooling, the water-cooled heat pump chiller 23 drops cold water from the drop tray 71 to cool the high-purity water flowing inside the condensing coil 41. The temperature of the cold water that has cooled the condensing coil 41 rises, and the cooling coil 31 disposed on the opposite side is cooled.
The refrigerant flowing inside is rising.

The water-cooled heat pump chiller 23 lowers the high-purity water of the refrigerant to a temperature of about −5 ° C. by the condensing coil 41 and sends it to the air conditioner 67 via the air conditioning pipe 63 connected to the condensing coil 41. Send high purity water. The air conditioner 67 cools the temperature of the indoor air, raises the temperature of the high-purity water to about 0 ° C., and returns to the water-cooled heat pump chiller 23 via the return pipe 69 for air conditioning.

Further, the cooling coil 31 on the opposite side is heated with high-purity water flowing from inside by dropping warm water from the drop tray 35. Further, the temperature of the cold water obtained by cooling the high-purity water having the condensing coil 41 warmed rises, and the refrigerant flowing in the cooling coil 31 arranged on the opposite side rises.

The water-cooled heat pump chiller 23 raises the temperature of the cooling coil 31 to about 35 ° C.
The high-purity water is sent to the underground heat exchanger 45 buried in the underground 43 via the cooling pipe 33 connected to 1. In the underground heat exchanger 45, the temperature of the air in the ground is raised, the temperature of the high-purity water is reduced to about 30 ° C., and the water returns to the water-cooled heat pump chiller 23 via the return pipe 21. This allows
When cooling the air-conditioning side, ordinary water becomes ice at about 0 ° C or less and does not flow, but in this case, it is high-purity water, so it will not freeze even if it is overcooled at about 0 ° C or less, and it will not flow Is kept. Further, by cooling the high-purity water to about −5 ° C., the temperature difference from the underground heat increases, so that the heat absorption is improved and the thermal efficiency can be improved.

The operation of the embodiment of the heat exchange system 1 configured as described above will be described. First, at the time of heating, at the time of starting the heat exchange system 1, first, a valve (not shown) attached to the pressurized water pipe 11 for supplying new pressurized water or supplementary pressurized water is opened, and water such as tap water is supplied. The water is supplied to the pure water treatment apparatus 13. The water purification apparatus 13 removes foreign substances from the supplied water such as tap water to obtain high-purity water, and then connects the high-purity pressurized water pipe 11a connected to the water purification apparatus 13 and the main circuit. From the connection point Pa of the return pipe 21, the water is sent to the water-cooled heat pump chiller 23 through the pure water sensor 25. In the water-cooled heat pump chiller 23, when the pure water degree sensor 25 determines that the value is equal to or more than a predetermined value, the water flows through the cooling coil 31 and is approximately-
Cool to 5 ° C. The cooled high-purity water is supplied to the underground 43 through a cold / hot water pipe 33 connected to the cold water coil 31.
The high-purity water is sent to the underground heat exchanger 45 buried in the water. At this time, the high-purity water is sent to the underground heat exchanger 45 while maintaining fluidity without freezing even when the super-cooled water is supercooled to about 0 ° C. or less. By cooling the high-purity water to about −5 ° C., the temperature difference between the high-purity water and the ground heat increases, so that the heat absorption is improved and the thermal efficiency can be improved.

The high-purity water sent to the underground heat exchanger 45 is
From the circulation pump 51 to the three-way valve 53 and the pure water sensor 25
Is returned to the water-cooled heat pump chiller 23. When high-purity water is traveling around the circuit of the evaporator 5 on the heat source side and the pure water sensor 25 determines that the value is equal to or less than a predetermined value, the pure water sensor 25 transmits the result to the control unit 27. . The control unit 27 outputs a command to the three-way valve 53 to
a and the third connection port 53c. As a result, dirty high-purity water is supplied from the third connection port 53c to the pure water treatment apparatus 13
The purified high-purity water is returned to the return pipe 21 of the circuit via the high-purity pressurized water pipe 11a, so that the purified high-purity water can be sent to the water-cooled heat pump chiller 23. Even if it is supercooled to -5 ° C, it can circulate without freezing, and the temperature difference from the ground heat can be increased, and the heat collection efficiency can be improved.

In the above description, when high purity water is determined to be equal to or less than a predetermined value by the pure water sensor 25 when supplying tap water or the like, after flowing through the cooling coil 31, High-purity water is sent to an underground heat exchanger 45 buried in the underground 43 via a cold / hot water pipe 33 connected to the coil 31. The high-purity water sent to the underground heat exchanger 45 passes through the three-way valve 53 and the pure water sensor 25 from the circulation pump 51,
It is returned to the water-cooled heat pump chiller 23. At this time,
The pure water sensor 25 transmits a result indicating that the high-purity water is equal to or less than a predetermined value to the control unit 27. The control unit 27 outputs a command to the three-way valve 53 to communicate the first connection port 53a and the third connection port 53c. As a result, dirty high-purity water is supplied to the third connection port 5.
3c, the purified high-purity water flows to the pure water treatment apparatus 13 and is purified. The purified high-purity water is returned to the return pipe 21 of the circuit through the high-purity pressurized water pipe 11a. It can be sent to the chiller 23. Thus, the circuit of the evaporator 5 on the heat source side circulates high-purity water until the pure water level sensor 25 determines that the value is equal to or more than the predetermined value. If the pure water sensor 25 determines that the value is equal to or higher than the predetermined value during the patrolling, the pure water sensor 25 flows through the cooling coil 31 to about −5 ° C.
Is cooled. The cooled high-purity water is supplied to the cold water coil 3
The high-purity water is sent to the underground heat exchanger 45 buried in the underground 43 via the cold / hot water pipe 33 connected to 1. The high-purity water sent to the underground heat exchanger 45 is returned from the circulation pump 51 to the water-cooled heat pump chiller 23 via the three-way valve 53 and the pure water sensor 25 in the same manner as described above. As described above, high-purity water is constantly determined by the pure water sensor 25 and is returned to the water-cooled heat pump chiller 23 directly through the three-way valve 53 according to the determination result, or to the pure water treatment apparatus 13. It is determined whether the water is cooled and returned to the water-cooled heat pump chiller 23. For this reason,
Since the high-purity water is constantly maintained at a high purity, it is possible to circulate through the circuit of the evaporator 5 on the heat source side while maintaining fluidity without freezing even when the super-cooled water is cooled to about 0 ° C. or less.
By cooling high-purity water to about −5 ° C., the temperature difference from the underground heat increases, so that the heat absorption is improved and the thermal efficiency can be improved.

The above operation has been described for the circuit of the evaporator 5 on the heat source side at the time of heating. However, the circuit of the air conditioner 61 at the time of cooling is also the same when high-purity water is used. Is omitted.

As described above, the present invention is directed to a circuit between heat exchangers for performing thermal work using a heat source such as geothermal heat and / or a refrigerant flowing through a circuit between a heat exchanger and an air conditioner. In the heat exchange system that performs heat exchange, high-purity construction is used to flow even if the fluid used for the refrigerant is supercooled, so that the temperature difference can be increased even when using an underground heat source, and Since it can be used for high-purity water using water, it can be used inexpensively and in large quantities, and a refrigerant with high thermal efficiency can be obtained.

[0030]

As described above, the fluid used as the refrigerant flowing in the circuit between the heat exchangers performing the heat work using the heat source such as geothermal heat and / or the circuit between the heat exchanger and the air conditioner. The structure is made high purity so that it can flow even if it is supercooled, so that the temperature difference with the heat source can be increased, so that the thermal efficiency can be improved. Further, since water such as inexpensive tap water can be used as a material of the refrigerant, it is possible to prevent an increase in cost. Also, even when high-purity water leaks, no environmental destruction occurs. In addition, since the high purity water level is maintained during operation, scale etc. do not adhere,
The effect that the heat exchange efficiency does not decrease is obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration conceptual diagram of a heat exchange system using high-purity water as a refrigerant according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of the overall configuration of a conventional heat exchange system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat exchange system, 3 ... Heat pump, 5 ... Evaporator, 7 ... Condenser, 13 ... Pure water treatment apparatus, 17 ...
... Ion exchange resin, 21 ... Return piping, 23 ... Water-cooled heat pump chiller, 25 ... Pure water sensor, 27 ...
... Control part, 31 ... Coil for cold water, 41 ... Coil for condensation, 45 ... Ground heat exchanger, 51 ... Circulation pump, 53
... three-way valve, 61 ... air conditioning equipment, 65 ... pure water storage tank, 6
7 ... Air conditioner

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI theme coat ゛ (reference) F28G 9/00 F28G 9/00 Z F term (reference) 3L054 BF02 BF08 BF10 4D006 GA03 GA06 KB11 MA12 PA02 PB06 4D025 AA01 AB02 BA21 BA27 BB07 DA10

Claims (4)

[Claims] 1. A heat exchange system having a secondary heat exchange circuit using a refrigerant that does not involve a phase change and transfers heat to and from a primary heat exchange circuit that undergoes a phase change of the refrigerant. The exchange circuit is provided with a bypass circuit interposed with deionization treatment means, and the secondary circuit water is passed through the bypass circuit to make pure water, and high-purity water is used as the secondary refrigerant in the secondary heat exchange circuit. A heat exchange system characterized by circulating water. 2. The apparatus according to claim 1, further comprising a flow path switching means for connecting to the bypass circuit, an electric conductivity detection sensor for the secondary refrigerant being provided, and when the detection value of the detection means becomes equal to or more than a set value, the flow path switching means is provided. The heat exchange system according to claim 1, further comprising control means for operating the secondary refrigerant to flow through the bypass circuit. 3. The heat exchange system according to claim 1, wherein a tap water pipe is connected to the bypass circuit. 4. A refrigerant circulation path on the heat-extraction side of the secondary heat exchange circuit.
A heat exchange system comprising means for removing scale and ions generated during operation from water as a secondary refrigerant to purify the water, thereby enabling heat exchange with the primary refrigerant of the primary heat exchanger.