JPH0311376B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a heat exchanger that heats or cools passing air to a set temperature in the air treatment passage, and controls the heat exchange capacity of the heat exchanger to communicate with the outlet of the air treatment passage. The present invention relates to an air conditioner that controls the room temperature of a space to be air conditioned.

Conventionally, in the above-mentioned air conditioners, in order to control the room temperature of the air-conditioned space within a set range, a sensor detects the room temperature of the air-conditioned space and the temperature of the passing air at the exit or inlet of the air processing passage, and the detection results are used to control the room temperature within the set range. The system automatically adjusts and controls the heating or cooling capacity of the heat exchanger based on the air conditioner's heating or cooling capacity, but does not cause discomfort to the occupants of the air-conditioned space, nor does it allow for manufactured goods or precision equipment to be used in the air-conditioned space. In order to perform highly accurate control with minimal room temperature fluctuations that will not adversely affect the Because high accuracy is required for the equipment, there is a problem that the cost of the equipment increases significantly.In particular, in air-conditioned spaces that require extremely high constant temperature, such as semiconductor manufacturing rooms, even higher room temperatures are required. The current situation is that fluctuation suppression performance is required.

An object of the present invention is to make it possible to effectively suppress room temperature fluctuations due to insufficient accuracy or accuracy limits of an automatic control system by rationally improving the heating or cooling process of passing air.

A characteristic configuration of the present invention is that in the above-mentioned air conditioner, a heat storage device containing a heat medium fluid that exchanges heat with the passing air is provided in the air processing passage on the downstream side of the heat exchanger.・The effects are as follows.

In other words, the temperature (ta) of the passing air after passing through the heat exchanger in the air processing passage fluctuates above and below the set temperature (tk) as shown by the broken line in Figure 3 due to the lack of precision in the automatic control system. In contrast, when the passing air passes through the heat storage device, heat is exchanged between the heat source fluid held in the heat source fluid and the passing air, and the heat storage action or heat dissipation action of the retained heat source fluid causes the passing air to By thermally buffering the fluctuations in the air temperature (ta), the range of fluctuation of the air temperature (tβ) after passing through the heat storage device relative to the set temperature (tk) can be reduced to (dβ), as shown by the solid line in Figure 3. , the fluctuation range (da) of the air temperature (ta) immediately after the heat exchanger is greatly reduced.

Therefore, even if the accuracy of the automatic control system is not very high, air at a sufficiently stable temperature can be continuously supplied to the air-conditioned space, and fluctuations in room temperature can be effectively suppressed. As a result, we were able to create an air conditioner that was inexpensive and had excellent temperature control.

In addition, for example, for air-conditioned spaces that require extremely high constant temperature, such as semiconductor manufacturing rooms, conventionally,
Due to the accuracy limits of the automatic control system, room temperature fluctuations could only be suppressed to about ±0.1°C, but by stabilizing the supply air temperature using the thermal buffer described above, room temperature fluctuations can be suppressed to ±0.1°C.
It is now possible to suppress the temperature to around 0.001℃,
This has led to a dramatic improvement in constant temperature air conditioning performance.

Next, embodiments will be described in detail based on illustrative drawings.

Figure 1 shows the air conditioning structure of a constant-temperature, dust-free chamber 1 used for manufacturing semiconductors and medical equipment, etc. Air taken out from the room through a fully porous floor 2 is introduced into an air processing passage 3, and the passage 3, the cooling coil 4 of the direct expansion type cools the passing air to a nearly saturated state, and the electric heating coil 5 provided downstream of the cooling coil 4 heats the cooling passing air to a set temperature. It has been done.

The air, which has been treated to the set temperature by both coils 4 and 5, is then sent to a blowing chamber 7 in the ceiling pocket by a blower fan 6 provided at the outlet of the passage 3.
At the same time, the pressurized air is supplied into the room in a downward laminar flow state through a high-performance filter 8 provided over the entire surface of the ceiling.

The figure shows a refrigerant gas compression device connected to the cooling coil 4, and 10 is a power supply circuit section that changes and controls the heat generation temperature and heat generation amount of the heating coil 5.

Proportional room temperature detection sensor 1 in the air-conditioned room 1
1, and an automatic controller 12 that proportionally controls the power supply circuit section 10 of the heating coil 5 to maintain the room temperature within a set range based on information from the detection sensor 11. It is configured to automatically and continuously maintain the most suitable temperature for the product.

In the air treatment passage 3, a Finch-Hube type heat storage device 13 containing a predetermined amount of water is provided downstream of the heating coil 5, and as shown in FIG. ) fluctuates up and down from the set temperature (tk) due to lack of accuracy or accuracy limit of the automatic control system, due to heat exchange between the water held in the heat storage device 13 and the passing air. Now, due to the heat storage or heat dissipation effect of retained water,
Fluctuations in the passing air temperature (ta) are thermally buffered, and the fluctuation width (dβ) of the air temperature (tβ) after passing through the heat storage device 13 is changed to the fluctuation width (dβ) of the air temperature (ta) immediately after the heating coil 5 ( da).

In other words, the temperature of the air supplied to the air-conditioned room 1 is stabilized by the thermal buffering effect of the heat storage device 13, and fluctuations in room temperature caused by insufficient accuracy or accuracy limits of the automatic control system are effectively suppressed. It is configured.

As shown in FIG. 2, the heat storage device 13 includes a plurality of meandering coil tubes 15 connected in parallel across a pair of headers 14a and 14b.
A, b, c, a large number of metal fins 16 are placed across the tubes 15a, b, c...
are installed in parallel, and a pump 17 that circulates and flows the water held in the tube is interposed between both headers 14a and 14b via a short-circuit circulation pipe 18. By equalizing the water temperature in each part of the finch tube through circulating flow,
The heat storage device 13 is configured to increase the heat exchange efficiency with respect to the air passing therethrough, so that the above-mentioned thermal buffering effect can be performed more effectively.

Next, another embodiment will be described.

The air processing passage 3 may be a passage formed by a ventilation duct instead of a passage formed by a casing of an air conditioner such as an air hand link unit or a fan coil unit, and the formation structure of the passage 3 may be various. Improvements are possible. or,
Instead of connecting both the outlet and the inlet of the passage 3 to the air-conditioned room 1 as described above, the combined air of return air and outside air from the air-conditioned room 1 is introduced into the entrance of the passage 3, or the outside air is connected to the air-conditioned room 1. The connection form of the passage 3 can be changed in various ways depending on the air conditioning type, such as a configuration in which only the air conditioner is introduced.

As a device for heating or cooling the air passing through the air processing passage 3, instead of the direct expansion type cooling coil 4 or the electric heating type heating coil 5, a cold water circulation type cooling coil, a hot water or steam circulation type heating coil, or a cold water spray can be used. Various types of mold cooling devices can be applied singly or in various combinations, and these devices are collectively referred to as heat exchangers 4 and 5.

As the heat source held in the heat storage device 13, various heat medium solutions can be used instead of water.

Instead of circulating and flowing the heat source fluid in the heat storage device 13 by the pump 17, the pump 17 may be omitted and the heat source fluid may be held in the heat storage device 13 in a static state, and the amount of heat source fluid held can be changed by heat exchange. It is changed as appropriate depending on the capacity of the vessels 4 and 5, the specific heat of the fluid, etc.

Furthermore, the specific shape and structure of the heat storage device 13 can be modified in various ways, such as by arranging only a large number of tubes in parallel instead of the finch tube type described above, or by forming a large number of air passage holes in the heat source fluid holding container. is possible.

The air conditioner according to the present invention can be applied to various types of air conditioning such as building air conditioning, household air conditioning, factory air conditioning, and special air conditioning.

[Brief explanation of the drawing]

The drawings show an embodiment of the air conditioner according to the present invention,
FIG. 1 is a diagram showing the air conditioning structure of a constant-temperature dust-free room, FIG. 2 is an enlarged perspective view of a heat storage device, and FIG. 3 is a graph showing fluctuations in air temperature. 3... Air treatment passage, 4, 5... Heat exchanger, 1
3... Heat storage device, 17... Pump.

Claims (1)

[Scope of Claims] 1. An air conditioner in which an air processing passage 3 is provided with heat exchangers 4 and 5 that heat or cool passing air to a set temperature, the air conditioner having a heat medium fluid that exchanges heat with the passing air. An air conditioner in which a heat storage device 13 is provided in the air processing passage 3 on the downstream side of the heat exchangers 4 and 5. 2. The air conditioner according to claim 1, wherein the heat storage device 13 is a Finch-Eube type coil. 3. The air conditioner according to claim 1 or 2, wherein the heat storage device 13 includes a pump 17 that circulates and flows the retained heat source fluid.