JP2014126208A - Air conditioning method and air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize air conditioning comfortable, stable, and adapted to cool-biz policy while suppressing energy consumption to be relatively low.SOLUTION: An air conditioning system of a package air conditioner type for keeping a temperature and a humidity in an indoor environment to a desired temperature and a desired humidity that are lower than those of outside air, respectively is provided. The air conditioning system includes: a total heat exchanger (1) treating the outside air; an air conditioner (2) connected to the total heat exchanger; and second air conditioners (4; 4a and 4b) treating sensible heat of indoor load. The air conditioner (2) overcools the air treated by the total heat exchanger to a temperature at which a required sensible heat treatment can be performed, and blowing out the overcooled air into a room (21).

Description

  The present invention relates to an air conditioning method and an air conditioning system. More specifically, the present invention relates to an air conditioning method and an air conditioning system in a packaged air conditioner system that maintains a room environment at a desired temperature and humidity lower than the temperature and humidity of outside air.

  In the summer, the indoor temperature is maintained at a desired temperature lower than the temperature of the outside air in an office or the like by air conditioning. However, it is required to realize a comfortable indoor environment with a relatively low humidity while maintaining the indoor temperature at, for example, about 28 degrees for power saving.

  In a general packaged air conditioner system, the outside air is processed by a direct expansion total heat exchanger. The temperature at which the air treated by the direct expansion total heat exchanger is blown into the room is the result. Specifically, the temperature at which the air that has passed through the direct expansion total heat exchanger is blown into the room is affected by fluctuations in the outside air temperature.

  There is also known a method of performing air conditioning using only an all-fresh air conditioner without using a total heat exchanger. In an all fresh type air conditioner, since the outside air is directly cooled and air-conditioned (temperature adjustment) and then blown into the room, the temperature of the air blown into the room is kept substantially constant.

  In the air conditioning method in which the outside air treatment is performed by the direct expansion total heat exchanger, when the room temperature is set to about 28 degrees for power saving, it is not possible to treat (dehumidify) a necessary degree of humidity. As a result, the indoor humidity is affected by the relatively high and fluctuating humidity of the outside air, often resulting in a sultry and uncomfortable indoor environment.

  In the air conditioning method using an all fresh air conditioner, as described above, the temperature of the air blown into the room can be kept substantially constant. However, it is impossible to blow out air at a temperature as low as necessary to ensure the required dehumidifying capacity, and it is impossible to realize a comfortable and stable air conditioning for cool biz. Further, since the outside air is directly cooled, the energy consumption is large.

  The present invention has been made in view of the above-described problems, and is an air conditioning method and an air conditioning system in a packaged air conditioner system that can realize comfortable and stable air conditioning for cool biz while keeping energy consumption relatively small. The purpose is to provide.

In order to solve the above-mentioned problem, according to the first aspect of the present invention, there is provided an air conditioning method in a packaged air conditioner system that maintains the indoor environment at a desired temperature and humidity lower than the temperature and humidity of the outside air,
Treating the outside air with a total heat exchanger;
Using an air conditioner connected to the total heat exchanger, and supercooling the air processed through the total heat exchanger to a temperature at which a required latent heat treatment can be performed and blowing the air into the room. An air conditioning method is provided.

In the second form of the present invention, an air conditioning system in a packaged air conditioner system that maintains the indoor environment at a desired temperature and humidity lower than the temperature and humidity of the outside air,
A total heat exchanger for treating outside air;
An air conditioner connected to the total heat exchanger,
The air conditioner provides an air conditioning system characterized in that the air processed through the total heat exchanger is supercooled to a temperature at which a required latent heat treatment can be performed and blown into the room.

  In the present invention, the outside air is processed using a total heat exchanger, and the air supplied from the total heat exchanger is supercooled to a temperature at which a required latent heat treatment can be performed by an air conditioner connected to the total heat exchanger. And blow out indoors. As a result, in the present invention, it is possible to realize a comfortable and stable air-conditioning for cool biz while keeping energy consumption relatively small.

It is a figure showing roughly the composition of the air-conditioning system concerning the embodiment of the present invention. It is an air line figure explaining the effect | action of the air conditioning system concerning this embodiment. It is a figure which shows roughly the structure of the air conditioning system concerning a comparative example. It is an air line figure explaining the inconvenience of the air-conditioning system concerning a comparative example.

  Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram schematically showing the configuration of an air conditioning system according to an embodiment of the present invention. FIG. 2 is an air diagram illustrating the operation of the air conditioning system according to the present embodiment. In the present embodiment, the present invention is applied to an air conditioning system that maintains the indoor environment at a desired temperature and humidity lower than the temperature and humidity of the outside air.

  Referring to FIG. 1, the air conditioning system according to the present embodiment includes a total heat exchanger 1 that processes outside air, an air conditioner 2 that is connected to the total heat exchanger 1, and a second that processes sensible heat of an indoor load. The air conditioner 4 is provided. The air conditioner 4 includes an outdoor unit 4a and an indoor unit 4b connected to the outdoor unit 4a. The air conditioner 2 air-conditions (temperature adjustment and humidity adjustment) the air supplied from the total heat exchanger 1, and then blows it out from the outlet 3 into the room 21.

  In the air diagram of FIG. 2, the vertical axis represents absolute humidity [kg / kg (DA)], and the horizontal axis represents dry bulb temperature (temperature of a general thermometer) [° C.]. A curve group extending to the right represents relative humidity (humidity of a general hygrometer) [%], and a straight line group extending to the right represents specific enthalpy [kJ / kg (DA)]. In the present specification, the dry bulb temperature is simply referred to as “temperature”, and the relative humidity is simply referred to as “humidity”.

  The total heat exchanger 1 is, for example, a manufacturer's standard product, and exchanges temperature and humidity between air (outside air) taken from the outside and air taken from the room 21. As a result, the temperature and humidity of the air processed through the total heat exchanger 1 have intermediate values between the temperature and humidity of the outside air taken in and the temperature and humidity of the room 21.

  As an example, as indicated by a point A in FIG. 2, the outside air temperature is about 34.3 ° C., the humidity is about 57%, and the absolute humidity is about 0.0195 [kg / kg (DA)]. And As indicated by point B, the temperature of the air in the room 21 is about 28 ° C., the humidity is about 45%, and the absolute humidity is about 0.0105 [kg / kg (DA)]. In this case, the air supplied from the total heat exchanger 1 to the air conditioner 2 has, for example, a temperature of about 31.2 ° C, a humidity of about 52%, and an absolute humidity as shown by a point C in FIG. About 0.015 [kg / kg (DA)].

  In the air conditioner 2, the absolute humidity of the air supplied from the total heat exchanger 1 hardly changes along the linear path from the point C to the point D in FIG. 2, and the temperature is about 31.2 ° C. From about 52% to about 100%, for example, about 97%. After that, in the air conditioner 2, the air humidity hardly changes according to the curved path from the point D to the point E in FIG. 2, and the temperature decreases from about 21 ° C. to about 12 ° C. The humidity decreases from about 0.015 [kg / kg (DA)] to about 0.0083 [kg / kg (DA)].

  As a result, the air that is air-conditioned by the air conditioner 2 and blown into the room 21 has a temperature of about 12 ° C., a humidity of about 96%, and an absolute humidity of about 0.0083 [kg / kg (DA). ]. That is, the air conditioner 2 uses the air supplied from the total heat exchanger 1 until the absolute humidity of the air blown into the room 21 becomes smaller than the absolute humidity corresponding to the desired indoor environment to be maintained. Cool and blow out into the room 21.

  There are sensible heat generation sources such as lighting fixtures and human bodies in the room 21, but the load in the room 21 due to these sensible heat generation sources is mainly controlled by the air conditioner 4 that is controlled only to approach the set room temperature. Processed. In other words, the air conditioner 4 is an air conditioner that mainly processes sensible heat of the indoor load. On the other hand, the load in the room 21 caused by a latent heat generation source such as a human body is mainly processed by the air blown out from the air conditioner 2. That is, in the present embodiment, the required latent heat treatment (the process indicated by the solid arrow F in FIG. 2) is performed while the energy consumption is kept relatively small by the cooperative action of the total heat exchanger 1 and the air conditioner 2. Air that has been supercooled to a possible low temperature (about 12 ° C.) can be blown into the room 21.

  In other words, due to the cooperative action of the total heat exchanger 1 and the air conditioner 2, low-temperature air cooled to an extent necessary to ensure the required dehumidifying capacity is blown into the room 21. As a result, in the present embodiment, as indicated by the dashed arrow G in FIG. 2, the room 21 can be maintained at a desired temperature and humidity by the low temperature air blown into the room 21, and thus comfortable and stable. Air conditioning that is compatible with cool biz can be realized.

  Hereinafter, in order to facilitate understanding of the operational effects of the present embodiment, the configuration of the air conditioning system according to the comparative example and its disadvantages will be described with reference to FIGS. 3 and 4. As shown in FIG. 3, the air conditioning system according to the comparative example includes a direct expansion total heat exchanger 11 that processes outside air and an air conditioner 14 that mainly processes sensible heat of an indoor load. The air conditioner 14 includes an outdoor unit 14a and an indoor unit 14b connected to the outdoor unit 14a.

  In the comparative example, the air supplied to the direct expansion coil 11b from the total heat exchanger 11a of the direct expansion total heat exchanger 11 is, for example, at a temperature of about 31.2 ° C. as indicated by a point C in FIG. The humidity is about 52% and the absolute humidity is about 0.015 [kg / kg (DA)]. Further, in the direct expansion coil 11b, the absolute humidity of the air supplied from the total heat exchanger 11a hardly changes according to the linear path from the point C to the point D in FIG. The temperature decreases from 2 ° C. to about 21 ° C., and the humidity increases from about 52% to a humidity close to 100%, for example, about 97%.

  Thereafter, in the directly expanded coil 11b, the temperature decreases from about 21 ° C. to about 16.5 ° C. without changing the air humidity, following the curved path from the point D to the point E ′ in FIG. However, the absolute humidity decreases from about 0.015 [kg / kg (DA)] to about 0.0112 [kg / kg (DA)]. As a result, the temperature of the air blown from the outlet 13 into the room 21 through the direct expansion total heat exchanger 11 is about 16.5 ° C., the humidity is about 96%, and the absolute humidity is about 0. 0112 [kg / kg (DA)].

  That is, in the comparative example, the absolute humidity of the air blown into the room 21 is higher than the absolute humidity corresponding to the desired indoor environment to be maintained. As a result, the air blown into the room 21 through the direct expansion total heat exchanger 11 does not have a dehumidifying capacity, and the temperature of the room 21 is about 28 ° as desired, as indicated by a broken arrow G ′ in FIG. Although the temperature is maintained at C, the humidity in the room 21 is affected by the humidity of the outside air, resulting in a sultry and uncomfortable room environment.

  As described above, in the air conditioning system according to the present embodiment, the outside air is processed using the total heat exchanger 1 and supplied from the total heat exchanger 1 by the air conditioner 2 connected to the total heat exchanger 1. The air is supercooled to a temperature at which a required latent heat treatment can be performed and blown out into the room 21. That is, in this embodiment, since the low-temperature air cooled to a level necessary to ensure the necessary dehumidifying capacity is blown out to the room 21, the dehumidification process is stably performed by processing the latent heat in the room 21. It can be performed.

  As a result, in this embodiment, it is possible to realize a comfortable and stable air conditioning for cool biz while keeping the energy consumption relatively small. Further, in the present embodiment, the outdoor heat load is reduced by the total heat exchanger 1, the required latent heat is processed by the air conditioner 2 connected to the total heat exchanger 1, and the indoor load is revealed by the second air conditioner 4. Since heat is being processed, it is possible to improve the unit COP (Coefficient of Performance) and the system COP, which in turn can save energy.

  In the above description, the second air conditioner 4 is used to process the sensible heat of the indoor load. However, the second air conditioner 4 is not an essential configuration and may be omitted in some cases. be able to.

  The latent heat load in the indoor load is mainly caused by the human body, and the size of the latent heat load is approximately proportional to the number of people unless the work contents are changed. On the other hand, the amount of outside air required to maintain the indoor air quality in a desired state is also substantially proportional to the number of people. From these things, in this embodiment, it is applicable also about the method of changing the amount of outside air according to the number of people in a room.

1 Total heat exchanger 2 Air conditioner 3 Air outlet 4 Second air conditioner 21 Indoor

Claims (6)

An air conditioning method in a packaged air conditioner system that maintains an indoor environment at a desired temperature and humidity lower than the temperature and humidity of outside air,
Treating the outside air with a total heat exchanger;
Using an air conditioner connected to the total heat exchanger, and supercooling the air processed through the total heat exchanger to a temperature at which a required latent heat treatment can be performed and blowing the air into the room. Air conditioning method. The air conditioning method according to claim 1, wherein the absolute humidity of the air blown into the room is smaller than the absolute humidity corresponding to a desired indoor environment to be maintained. The air conditioning method according to claim 1, further comprising processing sensible heat of the indoor load using the second air conditioner. The air conditioning method according to claim 3, wherein the second air conditioner includes an outdoor unit and an indoor unit connected to the outdoor unit. An air conditioning system in a packaged air conditioner system that maintains an indoor environment at a desired temperature and humidity lower than the temperature and humidity of outside air,
A total heat exchanger for treating outside air;
An air conditioner connected to the total heat exchanger,
The air conditioner is characterized in that the air processed through the total heat exchanger is supercooled to a temperature at which a required latent heat treatment can be performed and blown out into the room. The air conditioning system according to claim 5, further comprising a second air conditioner that includes an outdoor unit and an indoor unit connected to the outdoor unit, and that processes sensible heat of an indoor load.

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