JPH0151744B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for both cold air and cold water, and in particular, a package type air conditioner is capable of supplying cold water to a fan coil in addition to air conditioning cold air. , when overall air conditioning is not required and partial air conditioning using fan coils is sufficient, or when overall air conditioning and partial air conditioning using fan coils need to be adjusted and performed at the same time, the package type is used. An air conditioner provides economical and optimal air conditioning.

In general, package air conditioners are widely used because they are much more adaptable to individual air conditioning during overtime than central systems. However, in this package type air conditioner, temperature control is performed using a so-called retanthermotor, and therefore it is not possible to perform satisfactory temperature control for each of a plurality of rooms with different conditions. Therefore, in such a case, one package air conditioner must be installed in each room, but of course, in such an air system, the capacity of the package air conditioner does not necessarily exceed the capacity of each room. Coupled with the fact that it is not always suitable for the size, it is not sufficient from the viewpoint of energy saving. Therefore, for example, when air conditioning a small room, a fan coil unit smaller than a package air conditioner may be installed, or for a large room, multiple package air conditioners may be installed in one room. Otherwise, it was necessary to install a packaged air conditioner and a fan coil unit together. Therefore, in any case, it was not economical in terms of equipment, cost, and effort.

This invention solves the above-mentioned problems in conventional air conditioning systems.The purpose of this invention is to enable air conditioning using cold air and cold water using a common packaged air conditioner, and to provide optimal air conditioning with low-cost equipment. The purpose is to perform partial or individual air conditioning and overall air conditioning, either selectively or in combination, using the same packaged air conditioner. Then,
The objective is to provide an air conditioner that can simultaneously accommodate rooms with different air conditioning conditions and that can be air conditioned using the same packaged air conditioner. .

That is, this application discloses a method of supplying refrigerant to the evaporator 4 of a package air conditioner 6, which cools the air by passing it through the evaporator 4 that evaporates the refrigerant and blows out cold air, as in the illustrated embodiment. supply line
In parallel with C ₁ or branched from said conduit C ₁ ,
A conduit C ₂ is formed so that the refrigerant can be sent to the chilled water heat exchanger 3 to the fan coil unit 9, and the air conditioning by the fan coil unit 9 is also performed by the packaged air conditioner 6. The specified invention is an air conditioner for both cold air and cold water, which is characterized in that the air conditioner is capable of cooling air by passing it through an evaporator 4 that evaporates a refrigerant, and blows out cold air after cooling the air. in parallel with the refrigerant supply pipe C ₁ to the evaporator 4 of the machine 6, or
A pipe line _C2 is formed by branching from the pipe line C1 so as to be able to feed the refrigerant to the chilled water heat exchanger 3 to the fan coil unit ₉ , and is connected to the evaporator 4 through which the air passes and the chilled water heat exchanger 3. The heat exchanger 3 and one of these are provided with a dedicated valve for adjusting the amount of refrigerant supplied.
A joint invention of an air conditioner for both cold air and cold water, which is characterized in that the packaged air conditioner 6 can also perform air conditioning by the fan coil unit 9 by providing V ₁ and _{V 2} . shall be.

In this invention, a so-called packaged air conditioner is provided with a cold water heat exchanger for the fan coil unit, and air-cooled air conditioning inherent in the packaged air conditioner and water-cooled air conditioning by the fan coil unit can be performed simultaneously or selectively. The system was designed to achieve the optimal air conditioning effect according to the size of the room and the area where air conditioning is needed.

That is, a conduit to the chilled water heat exchanger to the fan coil unit was provided in parallel with the refrigerant supply conduit to the evaporator for refrigerant evaporation, or branched from the conduit. The evaporator and chilled water heat exchanger are equipped with special valves to control the amount of refrigerant supplied, and the evaporator and chilled water heat exchanger for the fan coil unit are operated selectively or simultaneously. I was able to activate and control it.

As a result, air conditioning can be performed using the same common packaged air conditioner in an optimal condition depending on the size of the room or air conditioner to be air conditioned. Furthermore, there is no need to separately install an air conditioning chiller for the fan coil unit, which is completely separate from the packaged air conditioner, and is extremely economical in terms of equipment and operating costs.

Embodiment FIG. 1 shows a basic circuit of one embodiment of the invention.

That is, the package air conditioner 6 mainly includes a compressor 1, a condenser 2 that cools high-temperature, high-pressure gas compressed by the compressor into a high-pressure refrigerant liquid, and a high-pressure refrigerant from the condenser 2. It consists of an evaporator 4 that receives liquid supply, a cold water heat exchanger 3 for the fan coil unit, and a blower 5 that blows air to the evaporator.

The compressor 1 communicates with the condenser 2 by a high temperature, high pressure gas feed line _C3 . Cooling water is supplied to the condenser 2 through a circulating water pipe 14 from a cooling tower 7 provided outside, and removes heat from the high-temperature, high-pressure gas, converting it into high-pressure refrigerant liquid. Although not shown, an air-cooled condenser may be used as the condenser. 8 in the figure is a cooling water circulation pump. The high-pressure refrigerant liquid produced by the condenser 2 is transferred to the refrigerant supply pipe.
It is connected through C ₁ to be fed to an evaporator 4 that evaporates the refrigerant liquid. This refrigerant supply pipe
C ₁ is a capillary tube or expansion valve 13;
It includes a variable flow rate control valve _V1 disposed in front of the variable flow rate control valve V1.

A pipe line _C2 for branching and feeding the refrigerant liquid to the chilled water heat exchanger 3 for the fan coil unit is configured to branch from the middle of the refrigerant supply pipe line _C1 .
This conduit C ₂ includes a capillary tube or expansion valve 12 and a variable flow control valve disposed in front of the capillary tube or expansion valve 12.
Contains V ₂ .

In this case, both variable flow rate control valves V ₁ and V ₂ may be configured to be controlled and operated in relation to each other. The low-temperature gas from the evaporator 4 and the low-temperature gas from the chilled water heat exchanger 3 are connected to return pipes C ₄ and C ₅ , respectively.
As a result, it is collected by the compressor 1.

Two fan coil units 9, 9 are connected to the cold water heat exchanger 3 through a cold water circulation pipe 18 for the fan coil units. In addition, 10 in the figure
16 is a circulation pump, 16 is a water supply pipe, and 17 is an air vent valve. According to this, a temperature sensor (not shown) detects the temperature of rethane air in a room to be cool-air-conditioned, and the variable flow rate control valve adjusts the amount of refrigerant liquid supplied to the evaporator 4 based on this. Operate V ₁ .

In this way, when the cold air cooled by the evaporator 4 is sent to rooms with different air conditioning conditions, a fan coil unit 9 with the ability to satisfy the air conditioning capacity of each room is installed. Then, a room thermostat (not shown) detects the room temperature and controls the variable flow rate control valve V ₂ in the pipe C ₂ that supplies refrigerant liquid to the cold water heat exchanger 3 to the fan coil unit 9. Then, the operation of the fan coil unit 9 is controlled so as to obtain an air conditioning condition suitable for the room. Although not shown, temperature control in the fan coil unit may be performed by controlling the air volume provided in the fan coil unit itself or by controlling the flow rate of cold water supplied thereto, as in the conventional manner. .

FIG. 2 shows a system in which a plurality of packaged air conditioners 6 (three in this case) are used, and a cooling water circulation pipe 18 including a circulation pump 10 is connected from the cold water heat exchanger (not shown in FIG. 2). A plurality of pairs of fan coil units 9 are connected in parallel. Note that 19 in the figure is a circuit that guides cold air from the evaporator 4 (not shown in Figure 2) through the attic to each room. Good too.

In this way, by using a plurality of package air conditioners 6 and connecting a plurality of fan coil units 9 in parallel, even if one package air conditioner 6 breaks down, cold water can still be supplied to the fan coil unit 9. Air conditioning can be done without running out of supply.

In any case, the variable flow control valve V ₁ ,
By controlling V ₂ in relation to each other, the temperature in each room can be finely adjusted to the optimum state and linearly.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the basic circuit of an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a plurality of packaged air conditioners and fan coil units connected in parallel. Heat exchanger for cold water, 4
is an evaporator, 6 is a package air conditioner, 9 is a fan coil unit, V ₁ and V ₂ are valves, C ₁ is a refrigerant supply pipe, and C ₂ is a refrigerant supply pipe to a chilled water heat exchanger. It is a conduit.

Claims (1)

[Scope of Claims] 1. A package type air conditioner that cools the air by passing air through an evaporator that evaporates refrigerant and blows out cold air. A conduit is formed so as to branch off from the conduit and feed the refrigerant to the chilled water heat exchanger for the fan coil unit. An air conditioner for both cold air and cold water, which is characterized by being able to perform both cold air and cold water. 2. In a packaged air conditioner that passes air through an evaporator that evaporates refrigerant to cool the air and blow out cold air, the refrigerant supply pipe to the evaporator is installed in parallel with the refrigerant supply pipe, or branched from the pipe. , a pipe line is formed so as to be able to feed the refrigerant to the cold water heat exchanger of the fan coil unit, and the amount of the refrigerant to be fed to the evaporator through which the air passes and the cold water heat exchanger, or one of them; A special valve is installed to control the air conditioner.
An air conditioner for both cold air and cold water, characterized by being able to perform air conditioning using a fan coil unit. 3. In the case where an evaporator for passing air and a heat exchanger for chilled water are provided with dedicated valves for controlling the amount of refrigerant fed, each valve is configured to be controlled in relation to each other. The air conditioner for both cold air and cold water according to item 2. 4. The air conditioner for both cold air and cold water according to claim 2, wherein the valve is a variable flow rate control valve. 5. A dual-use cold air/chilled water air conditioner according to claim 2, wherein there are a plurality of packaged air conditioners, and a plurality of fan coil units are connected in parallel to the packaged air conditioner. Device.