JPS5827342Y2 - air conditioner - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air conditioner using a plurality of water heat source heat pump devices (hereinafter referred to as air conditioners), and particularly relates to an air conditioner that uses a plurality of water source heat pump devices (hereinafter referred to as air conditioners).
The present invention relates to an air conditioner with improved p (coefficient of performance).

An air conditioning system that uses multiple air conditioners places as many air conditioners as necessary in each room of a building, connects these air conditioners in parallel through a series of water supply piping systems, and connects them in parallel using a water supply pump. The water in the piping system is circulated and supplied to each air conditioner.

The internal structure of an air conditioner used in a conventional air conditioner of this type will be explained with reference to FIG.

In the figure, 1 is a compressor, 2 is a 4-way valve, 3 is a water side heat exchanger, 4
5 is an air side heat exchanger, 5 is a throttle valve, and these are connected in a ring by a refrigerant passage 6 to form a refrigerant circuit.

The water side heat exchanger 3 exchanges heat between the refrigerant and the water supplied through the water supply pipe 7, and the air side heat exchanger 4
configured to perform heat exchange between the refrigerant and indoor air;
By changing the flow direction of the refrigerant by switching the direction valve 2, it is possible to perform both cooling and heating.

In other words, when the refrigerant flows in the direction of the solid arrow shown in the figure and circulates through the compressor 1, the water side heat exchanger 3, the air side heat exchanger 4, and the compressor 1 in this order, the high-pressure and high-temperature refrigerant flows on the discharge side of the compressor 1. The heat exchanger 3 on the side functions as a water-cooled condenser, and the heat exchanger 4 on the air side through which the cooled low-pressure/low-temperature refrigerant flows functions as an air cooler, resulting in cooling operation, and the refrigerant is circulated in the opposite direction of the dotted line in the figure. Since the water side heat exchanger 3 functions as a water cooler and the air side heat exchanger 4 functions as an air heater, heating operation is performed.

Therefore, the water circulating through the water-side heat exchanger 3 serves as cooling water during cooling and increases in temperature, and during heating serves as a heat source and decreases in temperature.

In department stores and other places that use large air conditioners equipped with multiple air conditioners, from mid-season to winter, the central part of the building where customers are crowded generates a large amount of heat, while the surrounding walls emit a large amount of heat into the outside air through the walls. Due to its large size, multiple air conditioners are used to cool the central part of the room and heat the surrounding walls.

Therefore, the water circulating through the water side heat exchanger of the air conditioner is
It is necessary to maintain the temperature between 20°C and 45°C, which can be used for both heating and heating operations.

FIG. 2 shows the overall structure of such a conventional air conditioner.

In the figure, 11 is an air conditioner shown within the chain line part of FIG.
The water supply pipes 7 connecting the water side heat exchangers 3 of the plurality of air conditioners 11 in parallel form a ring path.

12 is a water supply pump installed in the water supply pipe 7, and 13 and 14 are a high temperature water tank and a cooling tower arranged in parallel with a part of the water supply pipe 7.

15 is a three-way valve installed at one connection between the high temperature water tank 13 and the water supply pipe 7, 16 is a three-way valve installed at one connection between the cooling tower 14 and the water supply pipe 7, and 17 is a water supply. A temperature sensor is attached to the wall of the pipe 7 and is connected to the three-way valves 15 and 16.

Then, in response to the temperature measurement signal from the temperature detector 17, 3
The valve openings of the direction valves 15 and 16 are controlled to adjust the amount of water supplied from the water supply pipe 7 to the high temperature water tank 13 and the cooling tower 14, respectively.

Next, the operation of the air conditioner will be explained.

The water supplied under pressure by the water supply pump 12 has a temperature of 2.
When the temperature is within the range of 0' to 45°C, the 3-way valve 15°16
By adjusting the valves, the water does not flow into the high temperature water tank 13 and the cooling tower 14, but is supplied to the water side heat exchanger 3 of each air conditioner 11 through the water supply pipe 7 that is parallel to these.

On the other hand, if the water supply temperature is below 20℃ when starting the air conditioner,
In response to the temperature measurement signal from the temperature detector 7, the three-way valve 15 opens the bypass passage to the high-temperature water tank 13 appropriately, so that part of the supplied water flows into the high-temperature water tank 13 and is heated, and then the water in the water supply pipe 7 and By merging, the water supply temperature can be raised to 20°C or higher.

Additionally, when the feed water temperature is about to exceed 45°C, the valve opening of the 30,000 valve 16 is adjusted via the temperature detector 17, and a portion of the feed water flows into the cooling tower 14 and is cooled. Maintain water supply temperature below 45°C.

However, in the mid-winter period, the outside air temperature often drops below 20°C.
Cooling CO when cooling the heat exchanger 3 at a feed water temperature of 5°C
P is lower than when cooling with outside air at 20° C. or lower, making this a very unreasonable configuration from an energy saving and economic standpoint.

The present invention solves these drawbacks by adding an auxiliary water heat exchanger connected to the cooling water circuit in parallel to a part of the refrigerant circuit of the air conditioner, in addition to the conventional configuration described above. The present invention provides an air conditioner in which a refrigerant is selectively passed through the auxiliary water side heat exchanger.

The present invention will be explained below based on the embodiment shown in FIGS. 3 and 4.

Figure 3 shows the internal configuration of the air conditioner used in this example,
Reference numeral 21 denotes a part of the refrigerant circuit of the air conditioner 11, for example, an auxiliary water side heat exchanger connected in parallel between the water side heat exchanger 3 and the throttle valve 5, and a cooling water circuit including an auxiliary cooling tower 33, which will be described later. connected to.

22 a and 22 b are an inlet side passage and an outlet side passage of cooling water circulating through the auxiliary water side heat exchanger 21, respectively;
23 is a three-way valve installed at the connection between the refrigerant discharge port (during cooling operation) of the water side heat exchanger 3 and the refrigerant inlet of the auxiliary water side heat exchanger 21; 24 is a three-way valve of the water side heat exchanger 3; A temperature detector 25 is attached to a refrigerant discharge port (during cooling operation) and detects the temperature of the refrigerant, and 25 is a cooling water passage 22 on the inlet side of the auxiliary water side heat exchanger 21.
A temperature detector is attached to the wall and detects the temperature of the cooling water, and both are connected to the three-way valve 23 via 26 controllers.

The three-way valve 23, the temperature detectors 24 and 25, and the controller 26 function as a switching control device that selectively allows the refrigerant to flow through the auxiliary water side heat exchanger 21.

Then, the controller 26 receives temperature signals from the temperature detector 24 and the temperature detector 25, compares the refrigerant temperature with the cooling water temperature, and transfers the refrigerant to the auxiliary water side heat exchanger when the refrigerant temperature is higher. 21, and when the cooling water temperature is higher, the three-way valve 23 is switched so that the refrigerant flows into the refrigerant passage 6 parallel to the auxiliary water side heat exchanger 21.

Such an air conditioner is configured with water supply piping as shown in FIG. 4 to constitute the entire air conditioner.

11' to 17 are similar to the conventional structure shown in FIG.

31.32 is the auxiliary water side heat exchanger 21 of the air conditioner 11'
artificial side cooling water passage 22a, outlet side cooling water passage 22b
33 is an auxiliary cooling tower interposed between the cooling water passages 31 and 32, and 34 is a cooling water passage connected in parallel with the auxiliary cooling tower 33 and connecting the cooling water passages 31 and 32. 35 is a cooling water outlet of the auxiliary cooling tower 33, a three-way valve is installed at the downstream end of the bypass passage 34, and a branch point at the end of the cooling water passage 32; 36 is a cooling water passage 31;
A temperature detector 37, which is attached to the auxiliary water side heat exchanger 21 and detects the temperature of the cooling water upstream of the auxiliary water side heat exchanger 21, receives a temperature measurement signal from the temperature detector 36 and detects that the temperature of the cooling water is below the temperature at which cooling operation is possible. 38 is a pump that circulates and supplies cooling water to the auxiliary water side heat exchanger 21; 39 is a controller that operates a three-way valve to switch the cooling water circuit from the auxiliary cooling tower 33 to the bypass passage 34; 39, the auxiliary cooling tower 33; This is a pump that sprays cooling water to cool the outer wall of the heat exchanger inside, and the temperature of this cooling water is approximately equal to the outside air temperature.

In the air conditioner configured as described above, the temperature of the cooling water in the auxiliary water heat exchanger 21 is almost 20°C or less due to the outside air from the middle season to the winter season, and if cooling operation is started in this state, Cooling water temperature is determined by water side heat exchanger 3
below the refrigerant discharge temperature.

For this purpose, the controller 26 is
By switching the valve, the refrigerant is allowed to flow through the auxiliary water side heat exchanger 21, and the temperature of the refrigerant is further lowered.

At this time, the cooling water that has absorbed heat from the auxiliary water side heat exchanger 21 is
After being cooled by dissipating heat in the heat exchanger in the auxiliary cooling tower 33,
The refrigerant flows into the auxiliary water side heat exchanger 21 again to cool the refrigerant.

In this case, when the outside air temperature, that is, the cooling water temperature, drops significantly to the point that it interferes with cooling operation,
As described above, since the cooling water circuit is switched from the auxiliary cooling tower 33 to the bypass passage 34 and the operation of the auxiliary cooling tower is stopped at the same time, an abnormal drop in the cooling water temperature can be suppressed.

In this example, all air conditioners are equipped with an auxiliary water heat exchanger. The installed air conditioner or the like may be a conventional air conditioner without the auxiliary water side heat exchanger.

As described above, the present invention is configured so that, in an air conditioner equipped with an air conditioner that performs both cooling and heating, the refrigerant temperature can be kept at almost the outside air temperature during cooling operation from mid-season to winter. The cooling COP improves, and it does not affect other air conditioners operating for heating.
This leads to energy saving and economicalization.

[Brief explanation of drawings]

Figure 1 is an internal configuration circuit diagram of a conventional air conditioner that can perform both cooling and heating, Figure 2 is a circuit diagram of an air conditioner equipped with multiple air conditioners, and Figure 3 is an air conditioner according to the present invention. FIG. 4 is a circuit diagram showing the overall structure of the air conditioner. 3... Water side heat exchanger, 4... Air side heat exchanger, 6... Refrigerant passage, 7... Water supply pipe, 11... ...Water source heat pump device, 13.
...High temperature water tank, 14...Cooling tower, 21.
...Auxiliary water side heat exchanger, 22 a, 22 b
, 31.32... Cooling water passage, 33...
・Auxiliary cooling tower.

Claims (1)

[Scope of utility model registration request] It is equipped with a plurality of water heat source heat pump devices 11 that can perform both cooling and heating operations by changing the refrigerant flow direction of a refrigerant circuit including an air side heat exchanger 4 and a water side heat exchanger 3. In an air conditioner in which a water supply pipe circuit 7 that supplies water to a heat exchanger 3 is connected in parallel with a cooling tower 14 and a high temperature water tank 13 through which a portion of the supply water is bypassed depending on the temperature of the supply water, the water heat source heat pump device 11 An auxiliary water heat exchanger 21 connected to a cooling water circuit including an auxiliary cooling tower 33 is installed in a part of the refrigerant circuit in parallel, and refrigerant is selectively supplied to the auxiliary water heat exchanger 21 during cooling operation. An air conditioner characterized by being provided with switching control devices 23, 24, 25, and 26 for causing circulation.