JPH07233968A - Air conditioner system - Google Patents

Abstract

PURPOSE:To operate an air conditioning system in a more thermally efficient and economical manner by a method wherein when specific enthalpy of air taken in from the outside is larger than that of treated air, the air taken in is cooled to a predetermined dew point at a heat exchanger and further is heated to a predetermined temperature using medium heated at a heat exchanger. CONSTITUTION:When specific enthalpy of air taken in from the outside is larger than that of air adjusted to a predetermined temperature and humidity, for example, in summer, the air introduced into an air duct 12 is heat exchanged with medium (e.g. water) at a first heat exchanger 14 to precool it, and the air enters a second heat exchanger 16, where the air is cooled to a predetermined dew point to dehumidify it. Further the air enters a third heat exchanger 18 and is heated using the medium heated at the first heat exchanger 14 to a predetermined temperature. As a result, sensitive heat energy of processed air can be utilized effectively and an air conditioning system can be operated at high thermal efficiency and economically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system in which air taken in from outside air is adjusted to a desired temperature and humidity and sent to a required place. More specifically, the invention relates to a cold heat source device by increasing thermal efficiency. The present invention relates to an air conditioning system capable of reducing the load on the vehicle and reducing the capacity of the cold heat source device.

[0002]

2. Description of the Related Art A conventional air conditioning system (hereinafter simply referred to as "system") is a coil type heat exchanger along an air flow in an air duct 12 for flowing air as shown in FIG. Preheated first heat exchanger 15 for preheating
The second heat exchanger 16 for dehumidification and the third heat exchanger 18 for heating are sequentially provided, and the suction fan 20 is further provided at the air intake port of the air duct 12.

Further, in the conventional system, the first heat exchanger 15 is a hot water device 17 equipped with a boiler, the second heat exchanger 16 is a cold water device 38 equipped with a refrigerator, and the third heat exchanger is a boiler. Another hot water device 36 or first heat exchanger 1 equipped with
5 are connected to the same hot water device 17, respectively. Thereby, hot water is provided between the first heat exchanger 15 and the hot water device 17, cold water is provided between the second heat exchanger 16 and the cold water device 38, and a hot water device 36 different from the third heat exchanger or Hot water device 1
Hot water is circulated as a medium between and 7.

The air A taken from the outside air is once preheated by the first heat exchanger 15 for preheating, and then the second air for dehumidification.
The heat exchanger 16 cools it to a predetermined dew point temperature to dehumidify it, further heats it to a predetermined temperature by a third heat exchanger 18 for heating, and blows it to a necessary place. As described above, the conventional system uses the heat exchangers 1 each having an individual cold heat source facility.
The temperature of the air A taken from the outside air at 5, 16 and 18
The humidity is adjusted to obtain the treated air B having a predetermined temperature and a predetermined humidity.

[0005]

However, the above-mentioned conventional system has the following problems. First,
First, each heat exchanger has its own individual media source,
That is, the first heat exchanger is connected to the hot water device, the second heat exchanger is connected to the cold water device, and the third heat exchanger is connected to another hot water device or the same hot water device as the first heat exchanger, thereby heating and cooling. Is repeatedly heated. Therefore, it is not economical because it is wasteful in terms of thermal energy and equipment. In particular, the cold water device and the hot water device need to supply a large amount of cold water and hot water, respectively, resulting in a large-capacity large-scale facility, resulting in an increase in equipment cost and operating cost. Secondly, it is not necessary to operate the first heat exchanger for preheating and the hot water device 22 in the summer when the outside air temperature is high. Therefore, the water accumulated in the device and the connecting pipe causes corrosion, It was a problem that rust, scale, etc. were generated and the pipe was blocked.

Therefore, an object of the present invention is to make it possible to operate economically and efficiently when the specific enthalpy of the air taken from the outside air is larger than the specific enthalpy of the air adjusted to a predetermined temperature and a predetermined humidity, that is, in the summer. An object is to provide an improved air conditioning system.

[0007]

In order to achieve the above object, an air conditioning system according to the present invention comprises a heat exchanger in an air duct, and takes in air from the outside air so that the temperature and humidity can be adjusted by the heat exchanger. In an air conditioning system that is adjusted to obtain treated air having a predetermined temperature and a predetermined humidity, a first heat exchanger, a second heat exchanger, and a third heat exchanger that are sequentially arranged along an air flow in an air duct. A heat exchanger and a first
The medium outlet of the heat exchanger and the medium inlet of the third heat exchanger are connected, and the medium outlet of the third heat exchanger and the medium inlet of the first heat exchanger are connected via a pump to take in from outside air When the specific enthalpy of the air is higher than the specific enthalpy of the treated air, the intake air is pre-cooled by the first heat exchanger, then cooled by the second heat exchanger to a predetermined dew point, and further heated by the first heat exchanger. It is characterized in that the temperature of the air is raised to a predetermined temperature in the third heat exchanger by the used medium.

The application range of the air conditioning system of the present invention is not particularly limited, but since it can be combined with a clean room for semiconductor device manufacturing, as will be described later,
It is suitable as an air conditioning system that blows air required in the semiconductor device manufacturing process. The type of heat exchanger used in the present invention is not particularly limited, and a known heat exchanger such as a coil type or a plate type can be used. The circulation of the medium between the first heat exchanger and the third heat exchanger is generally performed by a pump. The medium to be used is not particularly limited, but water is the most common. In the present specification, the specific enthalpy of air is referred to as the specific enthalpy of the unit mass of enthalpy of air at a certain temperature and humidity. The case where the specific enthalpy of the air taken in from the outside air is larger than the specific enthalpy of the air adjusted to the predetermined temperature and the predetermined humidity means the case where A indicates the outside air and B indicates the treated air in FIG. 7. When the outside air temperature is low in winter and it is necessary to preheat before dehumidification, the connection may be changed like a conventional air conditioning system, and it can be operated in combination with a clean room as in the examples described later. You can also do it.

An air conditioning system according to another invention is provided with a heat exchanger in the air duct, takes in air from the outside air, adjusts the temperature and the humidity in the heat exchanger, and processes the predetermined temperature and the predetermined humidity. In an air conditioning system adapted to obtain air, an air duct vertically formed so as to take in air from a lower portion and flow it to an upper portion, and a first heat exchanger sequentially arranged in the air duct from bottom to top, A second heat exchanger and a third heat exchanger, wherein the first heat exchanger is a vaporizing section of the heat pipe mechanism and the third heat exchanger is a condensing section of the heat pipe mechanism, The first heat exchanger and the third heat exchanger are configured in a heat pipe mechanism, and when the specific enthalpy of the air taken in from the outside air is larger than the specific enthalpy of the treated air, the intake air is taken in by the first heat exchanger. Precool While evaporating the medium, then cooled to a predetermined dew point in the second heat exchanger is characterized in that so as to condense the medium while heating to a predetermined temperature further in a third heat exchanger. The heat pipe mechanism means a heat transfer mechanism using a large number of heat pipes as heat transfer elements.

[0010]

In the invention of claim 1, when the specific enthalpy of air taken in from the outside air (point A in FIG. 7) is larger than the specific enthalpy of air adjusted to a predetermined temperature and a predetermined humidity (point B in FIG. 7), for example, In the summer, the air introduced into the air duct is heat-exchanged with the medium in the first heat exchanger to be pre-cooled (the temperature decreases along the line 1 in FIG. 7) and enters the second heat exchanger, where it is predetermined. And is dehumidified (temperature and humidity decrease along line 2 in FIG. 7). Furthermore, the air is
It enters the third heat exchanger and is heated by the medium whose temperature has been raised in the first heat exchanger to reach a predetermined temperature (temperature rises along line 3 in FIG. 7). On the other hand, the medium circulating in the first heat exchanger and the third heat exchanger is heated by the air in the first heat exchanger to raise its temperature, and then the air is heated in the third heat exchanger to itself. To be cooled. The medium of the second heat exchanger cools the air in the second heat exchanger to be heated by itself, then cooled in the cold water device to be chilled, and circulates between the second heat exchanger and the cold water device. . Therefore, by effectively utilizing the sensible heat energy of the treated air, it is possible to reduce the load of the cold / hot heat source device (boiler, refrigerator), reduce its capacity, and save energy required for air conditioning.

According to the second aspect of the invention, the first heat exchanger and the third heat exchanger are provided.
By using a heat pipe mechanism with the heat exchanger,
The medium circulation between the heat exchanger and the third heat exchanger is performed by the heat pipe action.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail based on embodiments with reference to the accompanying drawings. Example 1 FIG. 1 is a schematic flow sheet showing the configuration of Example 1 of the air conditioning system according to the present invention. It should be noted that, of the devices and parts shown in FIG. 1, the same parts as those in FIG. 6 are designated by the same reference numerals and the description thereof is omitted. In this embodiment, an air conditioning system (hereinafter simply referred to as a system) 10 includes an air duct 12 and a first air duct 12 that is sequentially arranged in the air duct 12 along the flow of air, as shown in FIG. 1. The heat exchanger 14, the second heat exchanger 16, and the third heat exchanger 18 are provided.
The first, second and third heat exchangers 14, 16 and 18 are ordinary coil heat exchangers, and a medium such as hot water or cold water flows in the coil tubes. Furthermore, the system 10
Is equipped with a suction fan 20 at the inlet of the air duct 12 so as to take in air from the outside air through a filter (not shown) and allow it to flow downstream along the air duct 12.

The medium outlet 22 of the first heat exchanger 14 is connected to the medium inlet 26 of the third heat exchanger 18 via a pipe 24, and the medium outlet 28 of the third heat exchanger 18 is connected to the pipe 3
It is connected via 0 to the medium inlet 32 of the first heat exchanger 14. A water feed pump 34 is provided in the middle of the pipe 30 to feed the medium from the third heat exchanger 18 to the first heat exchanger 14. In this embodiment, water is used as the medium, and if necessary, the water pump 34 and the third
An intermediate tank of medium is provided between the heat exchanger 18 and the heat exchanger 18. Further, a hot water device 36 may be provided in the middle of the pipe 24 so that the medium can be heated if necessary. The medium side of the second heat exchanger 16 is connected to the chilled water device 38 by piping, and the medium circulates between the second heat exchanger 16 and the chilled water device 38.

In this embodiment, when the specific enthalpy of the air taken in from the outside air is larger than the specific enthalpy of the air adjusted to the predetermined temperature and the predetermined humidity, for example, in summer, the air introduced into the air duct 12 from the direction of the arrow. Is pre-cooled by exchanging heat with the medium in the first heat exchanger 14 and enters the second heat exchanger 16, where it is cooled to a predetermined dew point temperature and dehumidified. Further, the air enters the third heat exchanger 18,
It is heated by the medium whose temperature has been raised in the first heat exchanger 14 to reach a predetermined temperature, and from there, it is sent to the required place in the direction of the arrow. On the other hand, the medium circulating through the first heat exchanger 14 and the third heat exchanger 18 is heated by the air in the first heat exchanger 14 to raise the temperature, and then the air is heated in the third heat exchanger 18. Then it cools itself. The medium of the second heat exchanger 16 cools the air in the second heat exchanger 16 to be heated by itself, and then is cooled in the cold water device 38 to be chilled water,
It circulates between the heat exchanger 16 and the chiller device 38.

In the conventional system, since the first heat exchanger is used only as a heat exchanger for preheating, the specific enthalpy of the air taken in from the outside air is adjusted to a predetermined temperature and a predetermined humidity. At higher times, for example in summer, the first heat exchanger is not used as unnecessary and
Not only was the equipment useless, but scale was generated in the heat exchanger and in the medium piping, causing corrosion. On the other hand, in the air conditioning system according to the present invention, as a first effect, the first heat exchanger 14 is used as a precooling heat exchanger even in the summer. Moreover, by precooling the air, the second heat exchanger 16 for dehumidification and the chilled water device 3
The required capacity of 8 can be greatly reduced. Further, since the medium whose temperature has been raised in the first heat exchanger 14 is used in the third heat exchanger 18 for heating, a hot water device is not necessary or equipment with an extremely small capacity is sufficient. The second effect is that since the first heat exchanger 14 is always operated, no scale is generated in the heat exchanger and the pipe.

Example 2 FIG. 2 (a) is a schematic flow sheet showing the configuration of Example 2 of the stem of the system according to the present invention. In this embodiment, the system 40 includes a vertically installed air duct 1
2 and the first, second and third heat exchangers 14, 1 which are sequentially arranged in the air duct 12 from the bottom to the top along the air flow.
6 and 18 are provided. Air is introduced by a suction fan 20 provided at the bottom of the air duct 12 and flows from bottom to top. Medium outlet 4 of the first heat exchanger 14
4 is a medium inlet 45 of the third heat exchanger 18, and a medium outlet 46 of the third heat exchanger 18 is a medium inlet 47 of the first heat exchanger 14.
Respectively connected to.

In this embodiment, in order to circulate the medium between the first heat exchanger 14 and the third heat exchanger 18, Embodiment 1 is used.
Instead of the water pump 34 of the first heat exchanger 14 and the third
The entire system including the heat exchanger 18 and the pipes that connect them is configured as a heat pipe mechanism 42. The heat pipe is one of heat transfer promoting means, and the working fluid (water in this embodiment) circulates in the closed pipe while changing its phase to transport heat. The heat pipe is composed of an evaporator and a condenser, as schematically shown in FIG.
In the evaporator, the working fluid evaporates and absorbs heat from the outside, and in the condenser, the vapor condenses and radiates heat. The condensed liquid is wicked or grooved on the inner wall.
The mechanism is such that the inside of e) is driven by the capillary force and returns to the evaporation section. In the present embodiment, the first heat exchanger 14 serves as an evaporation unit, the medium takes heat from the air to evaporate, and the third heat exchanger 18 serves as a condensation unit, so that the medium applies heat to the air. Give and condense yourself.

If necessary, a hot water device or a cold water device which complements the function of the heat pipe may be interposed between the first heat exchanger 14 and the third heat exchanger 18. Second
Like the first embodiment, the heat exchanger 16 is connected to a chilled water device 38 that includes a refrigerator and supplies chilled water through a pipe.

When the specific enthalpy of the air taken in from the outside air is larger than the specific enthalpy of the air adjusted to the predetermined temperature and the predetermined humidity, for example, in summer, the air introduced into the air duct 12 from the direction of the arrow indicates the first heat. In the exchanger 14, heat is exchanged with the medium to be pre-cooled and then enters the second heat exchanger 16, where it is cooled to a predetermined dew point temperature and dehumidified. Further, the air enters the third heat exchanger 18, and the first heat exchanger 1
It is heated by the medium evaporated in 4 to reach a predetermined temperature, and from there, it is sent to the required place in the direction of the arrow. On the other hand, the medium circulating in the first heat exchanger 14 and the third heat exchanger 18 is heated by the first heat exchanger 14 by the air to evaporate, and then the third heat exchanger 18 heats the air. And condense myself. The medium is the first heat exchanger 14 and the third heat exchanger 1.
It circulates between 8 and 8 by a heat pipe action. The medium of the second heat exchanger 16 cools the air in the second heat exchanger 16 to be heated by itself, and then is cooled in the cold water device 38 to be chilled water, and the medium of the second heat exchanger 16 and the cold water device 38 Circulate between.

With the above-described structure, as in the first embodiment, the effect of energy saving and the effect of reducing the equipment capacity of the hot water device and the cold water device are exhibited.

Example 3 FIG. 3 is a schematic flow sheet showing the configuration of Example 3 of the system according to the present invention. In this embodiment, the system 50
Includes an air duct 12 installed in the vertical direction, and first, second and third heat exchangers 14, 16, 18 arranged in the air duct 12 along the flow of air sequentially from bottom to top. I have it. Air is introduced by a suction fan 20 provided at the bottom of the air duct 12 and flows from bottom to top.

In the present embodiment, the first heat exchanger 1 is replaced by natural circulation due to the height difference between the first heat exchanger 14 and the third heat exchanger 18 instead of the medium circulation by the heat pump of the second embodiment.
The medium is circulated between the No. 4 and the third heat exchanger 18.
That is, the medium preheated in the first heat exchanger 14 and heated by itself has a smaller specific gravity and rises upward to enter the third heat exchanger 18. In the third heat exchanger 18, the medium heats the air, is cooled by itself, has a large specific gravity, and descends, and then returns to the first heat exchanger 14. A hot water device and a cold water device may be provided between the first heat exchanger 14 and the third heat exchanger 18, if necessary.

With the above-described structure, as in the first embodiment, the effect of energy saving and the effect of reducing the equipment capacity of the hot water device and the cold water device are exhibited.

Example 4 FIG. 3 is a schematic flow sheet showing the configuration of Example 4 of the system according to the present invention. In this embodiment, the system 60
Is a system in which three systems 10A, B, C of Example 1 are arranged in parallel, and the first heat exchangers 14A, B, C of each system are arranged.
And the third heat exchangers 18A, B, C are connected in parallel, and the medium is circulated between the first heat exchanger 14 and the third heat exchanger 18 by the single water supply pump 62. In addition, the second heat exchangers 16A, 16B, 16C are also connected in parallel to the single chiller device 64. In addition, each of the first heat exchanger 14 and the second heat exchanger 16
Further, it is desirable to provide a flow rate adjusting device so that a required amount of the medium can flow through the third heat exchanger 18.

With the above-described structure, in this embodiment, the systems 10A, 10B, 10C installed at different locations can be intensively operated by one water pump 62 and one chiller device 64. Therefore, the facility cost and the operating cost can be significantly reduced. In the present embodiment, the number of systems 10 connected in parallel is three, but this number is arbitrary.

Embodiment 5 FIG. 5 is a flow sheet showing an example of how to use the system according to the present invention in winter. 5, the same devices and parts as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. When the specific enthalpy of the air taken from the outside air is smaller than the specific enthalpy of the air adjusted to a predetermined temperature and a predetermined humidity, for example, in winter, as shown in FIG. 5, the system 10 and the clean room J for manufacturing semiconductor devices are connected. It is possible to save energy. That is, the cooling heat exchanger (for example, a coil heat exchanger) K that cools the air circulating in the clean room J and the first heat exchanger 14 of the system 10 are connected to circulate the medium. Let The medium cools the circulating air in the heat exchanger K of the clean room J, is heated by itself and then enters the first heat exchanger 14,
Therefore, the low temperature air taken from the outside air is preheated. As a result, the system 10 according to the present invention can be effectively used as a cold heat source for the heat exchanger K even in winter. In FIG. 5, L is a filter for filtering the air circulating in the clean room J, and M is a fan for circulating the air.

[0027]

In the conventional air conditioning system, since the first heat exchanger is used only as a heat exchanger for preheating, the specific enthalpy of the air taken in from the outside air is adjusted to the predetermined temperature and the predetermined humidity. When it is larger than the specific enthalpy of air, for example, in the summer, the first heat exchanger is not used because it is not necessary to operate, the facility is not used, and scale is generated in the heat exchanger and the medium pipe, It was causing corrosion. On the other hand, according to the invention of claim 1,
Since the first heat exchanger operates as a pre-cooling heat exchanger even in the summer to pre-cool air, the required capacity of the second heat exchanger for dehumidification and the chilled water device (refrigerator) can be significantly reduced. it can. Further, in the third heat exchanger for heating, since the medium whose temperature has been raised by the sensible heat of the air in the first heat exchanger is used, a hot water device (boiler) is not required or the equipment has an extremely small capacity. Will be enough. Further, not only the size of the device can be reduced, but also the amount of energy required for air conditioning can be reduced. Secondly, since the first heat exchanger is constantly operated, corrosion is suppressed in the heat exchanger and the pipes, and scale does not occur.

In the second aspect, by combining the first heat exchanger and the third heat exchanger with the heat pipe mechanism, the medium can be circulated without using a water feed pump.

[Brief description of drawings]

FIG. 1 is a schematic flow sheet showing a configuration of a first embodiment of an air conditioning system according to the present invention.

FIG. 2 (a) is a schematic flow sheet showing the configuration of Example 2 of the air conditioning system according to the present invention, and FIG. 2 (b) is a schematic diagram for explaining a heat pipe.

FIG. 3 is a schematic flow sheet showing the configuration of Example 3 of the air conditioning system according to the present invention.

FIG. 4 is a schematic flow sheet showing the configuration of Example 4 of the air conditioning system according to the present invention.

FIG. 5 is a schematic flow sheet showing the configuration of Example 5 of the air conditioning system according to the present invention.

FIG. 6 is a schematic flow sheet showing a configuration of a conventional air conditioning system.

FIG. 7 is a graph showing a history of air in the air conditioning system.

[Explanation of symbols]

 10 Example 1 of air conditioning system 12 Air duct 14 1st heat exchanger 16 2nd heat exchanger 18 3rd heat exchanger 20 Suction fan 22 Medium outlet of the 1st heat exchanger 24 Piping 26 Of the 3rd heat exchanger Medium inlet 28 Medium outlet of the third heat exchanger 30 Piping 32 Medium inlet of the first heat exchanger 34 Water pump 36 Hot water device 38 Cold water device 40 Air conditioning system example 2 42 Heat pipe mechanism 44 First heat exchanger Medium outlet 45 Medium inlet of third heat exchanger 46 Medium outlet of third heat exchanger 47 Medium inlet of first heat exchanger 50 Air conditioning system embodiment 3 60 Air conditioning system embodiment 4 62 Water pump 64 Cold water apparatus

Claims (2)

[Claims] 1. An air conditioning system in which a heat exchanger is provided in an air duct, air is taken in from outside air, temperature and humidity are adjusted by the heat exchanger, and treated air having a predetermined temperature and a predetermined humidity is obtained. , First arranged sequentially along the air flow in the air duct
A heat exchanger, a second heat exchanger and a third heat exchanger,
The medium outlet of the heat exchanger and the medium inlet of the third heat exchanger are connected, and the medium outlet of the third heat exchanger and the medium inlet of the first heat exchanger are connected via a pump to take in from outside air When the specific enthalpy of the air is larger than the specific enthalpy of the treated air, the taken-in air is pre-cooled by the first heat exchanger, then cooled by the second heat exchanger to a predetermined dew point, and further by the first heat exchanger. An air conditioning system characterized in that the temperature of air is raised to a predetermined temperature in a third heat exchanger by a heated medium. 2. An air conditioning system in which a heat exchanger is provided in an air duct, air is taken in from outside air, temperature and humidity are adjusted by the heat exchanger, and treated air having a predetermined temperature and a predetermined humidity is obtained. , An air duct vertically formed so as to take in air from the lower part and flow to the upper part, and a first heat exchanger, a second heat exchanger and a third heat exchanger which are sequentially arranged in the air duct from the bottom to the top And a first heat exchanger and a third heat exchanger so that the first heat exchanger is an evaporation part of the heat pipe mechanism and the third heat exchanger is a condensing part of the heat pipe mechanism. When the specific enthalpy of the air taken in from the outside air is larger than the specific enthalpy of the treated air, the taken-in air is pre-cooled by the first heat exchanger to evaporate the medium, and then Second
An air conditioning system characterized in that a heat exchanger is used to cool to a predetermined dew point, and a third heat exchanger is used to condense the medium while raising the temperature of air to a predetermined temperature.