JPH03156225A - Air conditioner - Google Patents

Abstract

PURPOSE:To enable simultaneous cooling and heating operations according to demands from individual rooms, by a construction wherein a reheater functioning as a condenser is provided in a bypass passage for leading a portion of a discharged refrigerant into a liquid line, an air passage on the downstream of a utilization-side heat exchanger is divided into two branch passages, and the reheater is disposed in one of the branch passages. CONSTITUTION:A bypass passage 10A for leading a portion of a discharged refrigerant from a discharge pipe 7a of a compressor 1 into a liquid pipe 7c, a reheater 11 functioning as a condenser, and an ON-OFF valve 12 are provided. An air passage 50 on the downstream of a utilization-side heat exchanger 6 is divided into a cold-air passage 50a and a cold/hot-air passage 50b through which the air heated by the reheater 11 can be circulated. The refrigerant is circulated in a main refrigerant circuit 8, the heat exchanger 6 functions as an evaporator, and cold air is circulated through the air passage 50 by a fan 6a, whereby the cold air is supplied to each room through the coldair passage 50a. When the valve 12 is opened, a portion of the discharged refrigerant is led to the side of the bypass passage 10A, and the reheater 11 functions as a condenser, so that the cold air coning from the heat exchanger 6 is heated by the reheater 11 in the cold/hot-air passage 50b, and hot air is supplied to a room requiring heating.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in an air conditioner that performs heating and cooling operations in each room individually depending on the installation location of each room.

(Prior Art) Conventionally, air conditioners installed in buildings such as buildings have been used, for example, in ``New Edition/4th Edition [Refrigerating and Air Conditioning Handbook] (Application Edition), Published May 30, 1980, 41-43. As disclosed in "Page 4," as shown in FIG. y) and the air outlets (a), etc. installed in each room are connected via cold air ducts (b) and warm air ducts (c), respectively, using a so-called double duct system. As shown in Figure 5, there are systems that perform heating and cooling operations individually according to the demands of each room, and systems that are equipped with a single air conditioner (z) and have air outlets (N), (m) .

For example, by connecting with (n), ... with a cold air duct, and for rooms that require heating, install a reheater (0) that uses an electric heater or hot water coil to meet the indoor demands. It is well known that the air conditioner can be operated individually for heating and cooling.

(Problem to be solved by the invention) By the way, in buildings such as deep buildings, there is a demand for air conditioning inside the building (interior) even in winter due to large internal heat generation or differences in temperature settings. On the other hand, heating requests may occur indoors on the outer wall side (perimeter) of a building. Therefore, by using the above-mentioned conventional air conditioner, it is possible to meet the individual heating and cooling requirements of each room.

However, among the above-mentioned conventional systems, the former has a problem in that energy loss is large due to mixing cold and hot air, and the latter has a problem in that electric power for the reheater, hot water piping, etc. are separately required. In other words, in either case, a separate energy source and device are required to heat the once cooled air, resulting in an increase in costs.

The present invention has been made in view of the above points, and its purpose is to perform cooling operation (or heating operation) in each room without securing a separate energy source, and to request heating (or cooling operation) in a specific room. The object of the present invention is to enable simultaneous heating and cooling operations in accordance with the demands of each room without increasing costs by taking measures to deal with such demands when they occur.

(Means for solving the problem) As shown in FIG. 1, the first solution to achieve the above purpose is to use a compressor (1) and a heat source side heat exchanger (3) that functions as a condenser. An air conditioner comprising a main refrigerant circuit (8) formed by sequentially connecting a user-side pressure reduction mechanism (5) and a user-side heat exchanger (6) that is equipped with a fan (6a) and functions as an evaporator. The target is

Then, a part of the discharged refrigerant is bypassed from the discharge pipe (8a) of the compressor (1) to the liquid pipe (7c) between the heat source side heat exchanger (3) and the user side pressure reduction mechanism (5). A bypass path (10A), a reheater (11) that is interposed in the bypass path (10A) and functions as a condenser, and a bypass path (10A).
A) shall be provided with an on-off valve (12) for opening and closing.

Further, the downstream side of the user-side heat exchanger (6) of the ventilation passage (50) by the fan (6a) is connected to the user-side heat exchanger (6).
A cold air passageway (50a) through which only the cold air cooled by step 6) flows.
), the reheater (11) is interposed, and the reheater (11)
The structure is such that it branches into a cold/hot air passageway (50b) through which hot air heated by the cooling air passageway (50b) can flow.

As shown in FIG. 3, the second solution is aimed at an air conditioner similar to the first solution, and is designed to connect the user-side heat exchanger (6) and the heat source-side pressure reducing mechanism (4). liquid pipe (7c)
A pipe bus path (10B) that bypasses a part of the liquid refrigerant from the air to the suction pipe (8b) of the compressor (1), and a recooler (10B) that is interposed in the bypass path (10B) and functions as an evaporator.
3) and a pressure reducing valve (14) having a function of closing the bypass passage (10B).

Further, the downstream side of the user-side heat exchanger (6) of the ventilation passage (50) by the fan (6a) is connected to the user-side heat exchanger (6).
6) through which only the warm air heated in step 6) flows (50a
), the recooler (13) is interposed, and the recooler (13)
The structure is such that it branches into a cold/hot air passageway (50b) through which the cold air cooled by the cooling air passageway (50b) can flow.

(Function) With the above configuration, in the invention of claim (1), the refrigerant circulates in the main refrigerant circuit (8), so that the user-side heat exchanger (6) functions as an evaporator, and the fan (6a) The cold air flows through the ventilation passages (50) to create a cold air passage (50) in each room.
Cold air is supplied via a).

In that case, in winter, etc., a heating request may occur in a room located on the outside wall of a building, but when the on-off valve (12) of the bypass path (10A) opens, a part of the discharged refrigerant is transferred to the bypass path (10A). Since the reheater (11) functions as a condenser, the cold air from the user side heat exchanger (6) is heated by the reheater (11) in the cold/hot air passageway (50b), and the reheater (11) functions as a condenser. Warm air is supplied to a room. Therefore, simultaneous heating and cooling operations can be performed for each room individually without increasing costs due to the use of separate energy sources such as electric heaters and hot water.

In the invention of claim (2), the user-side heat exchanger (6) functions as a condenser by circulating the refrigerant in the main refrigerant circuit (8), and hot air flows through the ventilation path (50) to increase the temperature. Wind passage (5
Warm air is supplied into each room via 0a).

In that case, a cooling request will continue to occur in rooms inside the building, but as the pressure reducing valve (14) of the bypass path (Cl0B) opens, a portion of the liquid refrigerant in the main refrigerant circuit (8) will be removed from the bypass path (Cl0B).
10B) side, the recooler (13) functions as an evaporator, the hot air from the user side heat exchanger (6) is cooled in the cold/hot air passage (50b), and the cold air is delivered to the room where cooling is required. is supplied. Therefore, simultaneous heating and cooling operations can be performed in each room without increasing costs due to the use of a separate energy source.

(Example) Examples of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows a refrigerant piping system of an air conditioner according to a first embodiment of the invention as claimed in claim (1), in which (1) is a compressor, (2) is a refrigerant piping system, and FIG.
is a four-way switching valve that switches as shown in the solid line in the figure during cooling operation and as shown in the broken line in the figure during heating operation, and (3) is equipped with an outdoor fan (3a) that functions as a condenser during cooling operation and as an evaporator during heating operation. (4) is an outdoor electric expansion valve that functions as a pressure reduction mechanism during heating operation; (5) is an indoor electric expansion valve that functions as a pressure reduction mechanism during cooling operation; 6) is an indoor heat exchanger that is equipped with an indoor fan (6a) and functions as a user-side heat exchanger that functions as an evaporator during cooling operation and as a condenser during heating operation, and is a user-side heat exchanger that is equipped with an indoor fan (6a) and functions as a condenser during heating operation. 6) is connected to the refrigerant pipe (7) so that the refrigerant can flow;
A main refrigerant circuit (8) is configured that performs a heat pump action in which heat (or cold heat) obtained through heat exchange with outdoor air is released indoors using an indoor heat exchanger (6). Furthermore, the outdoor electric expansion valve (4) is connected to the discharge pipe (7a) of the main refrigerant circuit (8).
- A bypass passage (10A) for bypassing the refrigerant is provided in the liquid pipe (7c) between the indoor electric expansion valves (5), and the bypass passage (10A) has a condenser for condensing the discharged refrigerant to be bypassed. A reheater (11) that functions as
They are interposed in order from the 7a) side.

Here, as a feature of the present invention, the indoor heat exchanger (6)
, the indoor fan (6a), and the reheater (11) are housed in a single duct (50), and the duct (50) serves as a ventilation path for the indoor fan (6a). moreover,
The duct (50) is branched into a first branch duct (50g) and a second branch duct (50b) on the downstream side of the indoor heat exchanger (6), and the second branch duct (50b) reheats heat. A container (11) is provided. That is, during cooling operation, the indoor heat exchanger (50a) is connected to the first branch duct (50a).
) while the cold air cooled by the first branch duct flows through the first branch duct.
(50b) is configured to allow hot air generated by heating the cold air in the reheater (11) to flow therethrough, the first branch duct (50a) serving as a cold air passage, and the second branch duct (50b) serving as a cold air passage. (50b) is a cold/hot air passage. In addition, during heating operation, each branch duct (50a), (50b)
Warm air is distributed throughout the area.

On the other hand, Figure 2 shows the configuration of an air conditioning system that air-conditions each room in a building, where (X) is an air conditioner, and (A) is placed on the outside wall of the building, and is installed inside the room where heating load occurs in the winter. Air outlet for conditioned air, (B), (C),...
・ is an air outlet for conditioned air arranged in the interior of the building, and the air outlet (A) is connected to the second branch duct (50b), the air outlet (B), (C )
, . . . communicate with the first branch duct (50a), respectively.

In other words, during cooling operation, the air outlet (B) (C) of each room
,... while constantly supplying cold air to cool each room,
Warm air can be supplied to the air outlet (A) only when a heating request occurs indoors near the outer wall.

Therefore, in the above embodiment, during cooling operation, the four-way switching valve (2) is switched as shown by the solid line in the figure, the outdoor electric expansion valve (4) is fully open, and the indoor electric expansion valve (5) is set in response to the cooling request. Operation is performed with the opening adjusted to a predetermined degree, and the refrigerant discharged from the compressor (1) is condensed in the outdoor heat exchanger (3) and depressurized in the indoor electric expansion valve (5), resulting in indoor heat exchange. After being evaporated in the vessel (6), it is circulated back to the compressor (1) (see the solid line arrow in the figure). Then, cold air cooled by the indoor heat exchanger (6) flows through the duct (50), and the cold air is supplied to the air outlets (A), (B), . . . in each room. At that time, such as in the winter, a heating request occurs in a room located on the outer wall side of a building, but in such a case, the invention of claim (1) closes the on-off valve (12) of the bypass path (1, OA). By opening, a part of the discharged refrigerant is bypassed to the bypass path (10A) (see solid arrow in the figure), and the reheater (11) functions as a condenser, so the indoor heat exchanger (6) The cold air from the second branch duct (50b
), the second branch duct (50
Warm air is supplied via b), making it possible to meet heating demands. Heating by the reheater (11) does not use a separate energy source such as an electric heater or hot water, so there is no need to consume extra energy.

Therefore, simultaneous heating and cooling operations can be performed for each room individually without increasing costs due to the use of a separate energy source.

Next, a second embodiment according to the invention of claim 2 will be described. Fig. 3 shows a refrigerant piping system of an air conditioner according to the second embodiment, and shows the basic configuration of the main refrigerant circuit (8). is the same as the first embodiment, but in this embodiment, the indoor electric expansion valve (5) - outdoor electric expansion valve (4) of the main refrigerant circuit (8)
A bypass passage (10B) for bypassing the refrigerant is formed from the liquid pipe (7c) between them to the suction pipe (7b), and a recooler (13) functioning as an evaporator is installed in the bypass passage (10B).
) and a bypass electrically operated expansion valve (14) as a pressure reducing valve that can close the bypass passage (10B). Note that the configuration of the duct (50) of the air conditioner is the same as the first one above.
This is the same as FIG. 2 in the embodiment, and the illustration is omitted. However, in this embodiment, the first branch duct (50a) in FIG. 2 becomes a hot air passage, and the second branch duct (50b)
) is a cold and hot air passageway, the air outlet (A) is installed in a room located inside the building, and the air outlet (B) is installed inside the building.

(C), . . . are installed indoors on the outside wall side of the building.

In other words, during heating operation of the air conditioner, the main refrigerant circuit (8
), the four-way selector valve (2) is switched as shown by the broken line in the figure, the indoor electric expansion valve (5) is fully open, and the outdoor electric expansion valve (4) is adjusted to an appropriate opening according to the required capacity. The discharged refrigerant is condensed in the indoor heat exchanger (6), reduced in pressure by the outdoor electric expansion valve (4), evaporated in the outdoor heat exchanger (3), and then transferred to the compressor (1). Circulate back (see solid arrow in the figure). And the above duct (50)
Warm air heated by an indoor heat exchanger (6) flows through. At that time, even in winter, there may be a demand for air conditioning in a room located inside a building, but in the invention of claim 2, in such a case, the bypass electric expansion valve (14) is opened to a predetermined opening degree. As a result, a part of the liquid refrigerant condensed in the indoor heat exchanger (6) is bypassed to the bypass path (10B), reduced in pressure by the bypass electric expansion valve (14), and evaporated in the recooler (13). After that, it flows to be sucked into the suction pipe (7b) (see solid line arrow in the figure).

Therefore, in the second branch duct (50b), the warm air heated by the indoor heat exchanger (6) is sent to the recooler (13).
Cold air is supplied to the air outlet (A) of the room arranged inside through the second duct (50b), thereby meeting the cooling demand. Therefore, simultaneous heating and cooling operations can be performed for each room individually without increasing costs due to the use of a separate energy source.

In each of the above embodiments, the main refrigerant circuit (8) is configured to be able to switch between cooling and heating operation, but the invention of claim (1) allows cooling operation, and the invention of claim (2) allows heating operation. It is only necessary that the four-way switching valve (2) be provided.

(Effects of the Invention) As explained above, according to the invention of claim (1), the main refrigerant circuit of an air conditioner capable of cooling operation is provided with a bypass path that bypasses a part of the discharged refrigerant to the liquid line. , a reheater functioning as a condenser is interposed in this bypass passage, and the downstream side of the heat exchanger on the usage side of the ventilation passage formed by the fan is branched into two branch passages, and one branch passage is used for the above-mentioned reheating device. Since a heating device is installed, while cooling operation is performed in each room, if there is an individual heating request for a room on the outside wall of the building, it is possible to supply warm air to that room. ,
Simultaneous heating and cooling operations can be performed for each room individually without increasing costs due to the use of a separate energy source.

According to the invention of claim (2), the main refrigerant circuit of the air conditioner capable of heating operation is provided with a bypass path that bypasses a part of the liquid refrigerant to the suction line, and a refrigerant that functions as an evaporator is provided in this bypass path. While a cooler was installed, the downstream side of the heat exchanger on the user side of the ventilation path formed by the fan was branched into two branch paths, and the above-mentioned recooler was installed in one of the branch paths. If there is a demand for cooling in a room inside a building while heating the room, cold air can be supplied to that room, without increasing costs due to the use of a separate energy source. Each room can be heated and cooled simultaneously.

[Brief explanation of the drawing]

Figures 1 and 2 show the first embodiment, Figure 1 is a refrigerant piping system diagram of the air conditioner, Figure 2 is a block diagram showing the overall configuration of the duct, and Figure 3 is the second embodiment. FIG. 3 is a refrigerant piping system diagram of the air conditioner. 4 and 5 show the configuration of conventional ducts, FIG. 4 is a block diagram showing the configuration of a double duct system, and FIG. 5 is a block diagram showing the configuration of a single duct system. 1 Compressor 3 Outdoor heat exchanger (heat source side heat exchanger) 4 Indoor electric expansion valve (user side pressure reducing mechanism) 5 Outdoor electric expansion valve (heat source side pressure reducing mechanism) 6 Indoor heat exchanger (user side heat exchanger) 68 Indoor fan 7a Discharge pipe 7b Suction pipe 7c Liquid pipe 8 Main refrigerant circuit 10 Bypass path 11 Reheater 12 On-off valve 13 Recooler 14 Bypass electric expansion valve (pressure reducing valve) 50 Duct (ventilation path) 50a First branch duct ( Cold air passage or hot air passage) 2nd branch duct (cold air passage) 0b

Claims (2)

[Claims] (1) A compressor (1), a heat source-side heat exchanger (3) that functions as a condenser, a user-side pressure reduction mechanism (5), and a fan (6).
a) is attached to a user-side heat exchanger that functions as an evaporator (
6), in which the air conditioner is equipped with a main refrigerant circuit (8) connected in sequence, from the discharge pipe (8a) of the compressor (1) to the heat source side heat exchanger (3) and the user side pressure reduction mechanism. (5) The liquid pipe (7c
) to bypass a part of the discharged refrigerant (10A
), a reheater (11) that is interposed in the bypass passage (10A) and functions as a condenser, and an on-off valve (12) that opens and closes the bypass passage (10A). The above-mentioned user-side heat exchanger (
6) On the downstream side, there is a cold air passageway (50a) through which only the cold air cooled by the usage side heat exchanger (6) flows, and the reheater (
11) is interposed, and the air conditioner is branched into a cold/hot air passageway (50b) through which hot air heated by the reheater (11) can flow. (2) A compressor (1), a heat source side heat exchanger (3) functioning as an evaporator, a heat source side pressure reduction mechanism (4), and a fan (6).
a) is attached to the user-side heat exchanger that functions as a condenser (
6), from the liquid pipe (7c) between the user side heat exchanger (6) and the heat source side pressure reducing mechanism (4). The suction pipe (8b) of the compressor (1)
) bypass passage (10B) that bypasses a part of the liquid refrigerant
, a recooler (13) interposed in the bypass passage (10B) and functioning as an evaporator, and a pressure reducing valve (14) having a function of closing the bypass passage (10B), and the fan (6a) The downstream side of the user side heat exchanger (6) of the ventilation path (50) is a hot air path (50a) through which only the hot air heated by the user side heat exchanger (6) flows, and a hot air path (50a) through which only the hot air heated by the user side heat exchanger (6) flows, and An air conditioner characterized in that a recooler (13) is interposed and the air conditioner is branched into a cold/hot air passageway (50b) through which cold air cooled by the recooler (13) can flow.