JP2001349594A - Air conditioning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning apparatus capable of reducing noise, and preventing deterioration and troubles from happening, and further shortening accumulated actuation time within a predetermined period. SOLUTION: A cooling apparatus A is provided which includes a freezing cycle 10 where there can be cooled air in a building of a bureau, in which a heating radio apparatus is installed, a room temperature set switch for setting a target room temperature, a room temperature sensor 81, a refrigerant temperature sensor 82, a fresh air temperature sensor 83, and a control unit 8 in which once detected room temperature rises beyond (target room temperature and a differential value), it actuates the freezing cycle 10 while the detected room temperature lowers below the target room temperature, it interrupts the actuation of the freezing cycle 10. In the apparatus, the differential value is more increased as the set target room temperature becomes lower.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for cooling an unmanned room where electronic devices that generate heat are installed, or a manned room where devices that generate heat are installed.

[0002]

2. Description of the Related Art Since the room temperature inside a station rises due to heat generated by electronic equipment such as a wireless communication device, it is necessary to cool the inside of the station in order to maintain the performance of the wireless communication device.
For this reason, conventionally, the inside of the station where the wireless communication device is installed has been cooled by a cooling device in which a compressor, an outdoor heat exchanger, and an indoor heat exchanger are connected in a ring via a refrigerant pipe. The controller of the cooling device activates the cooling device when the detected room temperature rises above {target room temperature + differential value (fixed at 1 deg)}, and stops the operation of the cooling device when the detected room temperature falls below the target room temperature. Control.

[0003] The above-mentioned cooling device specifically operates as follows. The room temperature in the office building is reduced by the operation of the cooling device. When the detected room temperature falls below the target room temperature, the operation of the cooling device stops. Due to the heat generated by the wireless communication device, the room temperature in the station building rises in a short time, the detected room temperature quickly exceeds the (target room temperature + differential value (fixed at 1 deg)) or more, and the cooling device is turned on again. Become.

[0004]

The above-mentioned conventional cooling device has the following problems. Frequent repetition of activation and deactivation results in easy failure and high noise. Since the operation time throughout the year is long, the compressor and the like are easily deteriorated.
It uses a lot of energy.

An object of the present invention is to provide an air conditioner capable of reducing noise, hardly causing deterioration and failure, and shortening the cumulative operation time within a predetermined period.

[0006]

Means for Solving the Problems [Claim 1] The cooling means is capable of cooling air in an unmanned room in which electronic devices that generate heat are installed. Set the target room temperature with the room temperature setting device. The air-conditioning environment detecting means detects an air-conditioning environment including room temperature. The control means of the air conditioner determines that the detected room temperature is (target room temperature +
When the temperature rises above the differential value), the cooling means is activated, and when the detected room temperature falls below the target room temperature, the operation of the cooling means is stopped. Note that the differential value takes a larger value as the set target room temperature is lower.

When the target room temperature is low, the room temperature is controlled to be low. Therefore, even if the room temperature rises significantly from the target room temperature, the electronic equipment is not broken. Therefore, the lower the set target room temperature, the larger the differential value. For this reason, the lower the target room temperature, the longer the time from the operation stop to the operation state is extended, and the air conditioner does not repeat the operation and the operation stop frequently. The higher the set target room temperature, the smaller the differential value. Therefore, when the target room temperature is high, the cooling unit is activated before the room temperature becomes abnormally high and the electronic device is broken. In addition, the differential value when the target room temperature is high is set to a value slightly larger than the differential value (fixed) of the conventional air conditioner so that the operation and the operation stop are not frequently repeated.

For this reason, since the operation and the stop of the operation are not frequently repeated, it is difficult to cause a failure and noise can be reduced. The cumulative operation time within the predetermined period can be shortened. Therefore, the compressor and the like are hardly deteriorated, and energy saving can be achieved.

[Claim 2] The cooling means is capable of cooling the air in a manned room equipped with appliances that generate heat (for example, cookers, OA appliances, electric furnaces, and lighting appliances).
Set the target room temperature with the room temperature setting device. The air-conditioning environment detecting means detects an air-conditioning environment including room temperature.

The control means of the air conditioner activates the cooling means when the detected room temperature rises above (target room temperature + differential value), and stops the operation of the cooling means when the detected room temperature falls below the target room temperature. Note that the differential value takes a larger value as the set target room temperature is lower.

When the target room temperature is low, the room temperature is controlled to be low. Therefore, even if the room temperature rises significantly from the target room temperature, human health in the room is not significantly impaired. Therefore, the lower the set target room temperature is, the larger the differential value is. Value. For this reason, the lower the target room temperature, the longer the time from the operation stop to the operation state is extended, and the air conditioner does not repeat the operation and the operation stop frequently.

The higher the set target room temperature is, the smaller the differential value is. For this reason, when the target room temperature is high, the cooling unit is activated before the room temperature becomes abnormally high and significantly impairs the human health in the room. In addition,
The differential value when the target room temperature is high is set to a value slightly larger than the differential value (fixed) of the conventional air conditioner so that the operation and the operation stop are not frequently repeated.

For this reason, since the operation and the operation stop are not frequently repeated, it is difficult to cause a failure and noise can be reduced. The cumulative operation time within the predetermined period can be shortened. Therefore, the compressor and the like are hardly deteriorated, and energy saving can be achieved.

[Claim 3] The differential value determined corresponding to the target room temperature is corrected so as to increase as the outside air temperature decreases. For this reason, the outside air temperature is low,
In the case where the room temperature does not become extremely high even when the cooling is stopped and the electronic device is not likely to be broken (case 1) or when the human health in the room is not significantly impaired (case 2), Since the differential value is corrected so as to increase, the time from when the cooling means stops operating to when the cooling means enters the operating state can be further extended, and the operation and the operation stop are not repeated more frequently. Further, when the outside air temperature is high and the room temperature becomes high when the cooling is stopped, the differential value is corrected so as to be small, so that the electronic device is not broken (in the case of claim 1), and the indoor human health is improved. Is not significantly impaired (in the case of claim 2).

[Claim 4] The cooling means includes a compressor for compressing the refrigerant, an outdoor heat exchanger for cooling and condensing the high-temperature and high-pressure gas refrigerant with outside air, an expansion valve for expanding the liquid refrigerant, This is a refrigeration cycle in which an indoor heat exchanger that evaporates by exchanging heat of the refrigerant with indoor air and evaporating the refrigerant through a refrigerant pipe. Since the cooling means does not repeat the operation and the operation stop, it is difficult for the compressor and the like to break down, and it is possible to reduce the number of times of noise generated when the compressor and the like are started and the time of noise generated during the operation of the compressor and the like. it can.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention (Claim 1,
4) will be described with reference to FIGS. Figure 1,
As shown in FIG. 2, a cooling device A for cooling the inside of the office 1 includes a compressor 2, an outdoor heat exchanger 3, an expansion valve 5, and an indoor heat exchanger 6 formed in a ring through a refrigerant pipe 7. It has a connected refrigeration cycle 10 and is controlled by the controller 8.

The station building 1 (operating all year round) is installed at a place where radio waves can be easily jumped (the roof of a building, the top of a mountain, etc.), and is unmanned except during inspection. Inside the station building 1, a wireless device 11 for relaying radio waves emitted from a mobile phone, a battery power source 12 switched at the time of a power failure, a power receiving device 13 for stepping down and rectifying a commercial AC power source, and the indoor heat of the cooling device A The exchanger 6, the ventilation fan 15, and the like are arranged.

Compressor 2 (output 3.5 in this embodiment)
kW) is for compressing the refrigerant,
It is driven by a 0V motor. Outdoor heat exchanger 3
Is for cooling the high-temperature and high-pressure gas refrigerant flowing out of the compressor 2 with outside air and condensing it. The outdoor heat exchanger 3 is installed outside the station building 1 and has an outdoor blower 31.
(In this embodiment, the output is 0.07 kW × 2).

The expansion valve 5 adiabatically expands the liquid refrigerant, and the refrigerant that has passed through the expansion valve 5 is reduced in pressure and temperature and becomes mist and enters the indoor heat exchanger 6. The opening degree of the expansion valve 5 is controlled by the controller 8 based on the sensor output of the refrigerant temperature sensor 82 so that the degree of superheat of the refrigerant becomes a predetermined value during the cooling operation.

The indoor heat exchanger 6 is for exchanging heat between the mist-like refrigerant, which has been reduced in temperature and pressure by the expansion valve 5, and indoor air. The indoor heat exchanger 6 is installed in the office building 1 and has an indoor blower 61 (in this embodiment, an output of 0.15 k
W) is attached to blow cold air into the office building 1.

Reference numeral 80 denotes a controller, which is installed in the station building 1. The administrator operates the room temperature setting switch of the controller 80 to set the target room temperature in the station building 1 to the predetermined temperature (2
(In the range of 0 ° C to 40 ° C).

The ventilation fan 15 rotates in a predetermined pattern (for example, every predetermined time) while the cooling operation is stopped, and
Ventilate the air inside.

The controller 8 includes a room temperature sensor 81 for detecting the average room temperature in the station 1, a refrigerant temperature sensor 82 for detecting the temperature of the refrigerant on the outlet side of the indoor heat exchanger 6, and an external sensor for detecting the outside air temperature. A sensor output from the temperature sensor 83 is input.

In this embodiment, the differential value is
As shown below, four steps (see also FIG. 3) are determined so that the lower the set target room temperature, the larger the value. Target room temperature exceeds 35 ° C and 40 ° C or less --- → 2.5de
g Target room temperature exceeds 30 ° C and 35 ° C or less --- → 5.0 de
g Target room temperature exceeds 25 ° C and 30 ° C or less --- 7.5de
g Target room temperature exceeds 20 ° C and 25 ° C or less --- 10.0d
eg

When the detected room temperature rises to (target room temperature + differential value) or more while the cooling operation is stopped, the controller 8 drives the compressor 2, the outdoor blower 31 of the outdoor heat exchanger 3, and the indoor heat exchange. Power is supplied to the indoor blower 61 of the heater 6 to perform the cooling operation.

When the detected room temperature falls below the target room temperature due to the cooling operation, the controller 8 stops the power supply to the motor for driving the compressor 2 and the outdoor blower 31 of the outdoor heat exchanger 3 to perform the cooling operation. Stop. And again,
When the detected room temperature rises above (target room temperature + differential value), the cooling operation is restarted.

The cooling device A of this embodiment has the following advantages. The cooling device A is operated when the target room temperature is the highest (35 ° C.).
Is set to 2.5 deg, and the lowest value (exceeding 20 ° C. and 25 ° C.
10.0 ° C)
g.

For this reason, in the cooling device A, in the set temperature range of the target room temperature (20.degree. C. to 40.degree. C.), it is possible to extend the time from the stoppage to the operation state as compared with the conventional cooling device, Do not repeat operation stop and operation state frequently.

Therefore, the compressor 2 and the outdoor blower 31 are hardly broken down, and the number of times of noise generated when the compressor 2 and the outdoor blower are started and the time of generation of noise generated during their operation can be reduced.

The set temperature range of the target room temperature (20 ° C.
(40 ° C.), the cumulative operating time per year can be reduced as compared with the conventional cooling device. For this reason, the compressor 2 and the outdoor blower 31 are hardly deteriorated, and
Energy saving can be achieved.

If the differential value is fixed to a large value (for example, 10.0 deg) irrespective of the target room temperature, if the administrator sets the target room temperature as high as, for example, 40 ° C., the room temperature is not changed during the cooling operation stop. If the temperature of the wireless device does not rise to 50 ° C., the cooling operation does not start, and the wireless device may be damaged by high heat.

However, even if the administrator sets the target room temperature as high as 40 ° C., for example, the cooling device A starts the cooling operation when the room temperature reaches 42.5 ° C. Does not break down. When the administrator sets the target room temperature as low as 20 ° C., for example, the differential value takes a large value of 10.0 deg.
It is possible to extend the time until the operation state, and to obtain a large energy saving effect.

Next, a second embodiment of the present invention will be described.
3 and 4) will be described with reference to FIGS. The cooling device B differs from the cooling device A in the following points. When the outside air temperature is low, the room temperature is low, so that even if the detected room temperature falls below the target room temperature and cooling stops, the room temperature does not become extremely high, so that the wireless device 11 and the like in the station building 1 are not broken. For this reason, in the present embodiment, the differential value determined corresponding to the target room temperature is corrected so as to increase as the outside air temperature decreases.

First, the differential value corresponding to the target room temperature (when the outside air temperature is 21 ° C. to 40 ° C.) is determined in four steps (see the thick solid line in FIG. 4) as described below. Target room temperature exceeds 35 ° C and 40 ° C or less --- → 2.5de
g Target room temperature exceeds 30 ° C and 35 ° C or less --- → 5.0 de
g Target room temperature exceeds 25 ° C and 30 ° C or less --- 7.5de
g Target room temperature exceeds 20 ° C and 25 ° C or less --- 10.0d
eg

Each differential value is steplessly corrected so as to increase as the outside air temperature decreases.
For example, the differential value at an outside air temperature of 20 ° C. or less takes the following value. Target room temperature exceeds 35 ° C and 40 ° C or less ---> 3.5de
g Target room temperature exceeds 30 ° C and 35 ° C or less --- 6.5 de
g Target room temperature exceeds 25 ° C and 30 ° C or lower --- 9.5 de
g Target room temperature exceeds 20 ° C and 25 ° C or less --- → 12.5d
eg Further, the differential value at an outside air temperature of 41 ° C. to 45 ° C. takes the following value. Target room temperature exceeds 35 ° C and 40 ° C or less-→ 1.5de
g Target room temperature exceeds 30 ° C and 35 ° C or less --- → 3.0 de
g Target room temperature exceeds 25 ° C and 30 ° C or less --- → 4.5de
g Target room temperature exceeds 20 ° C and 25 ° C or less --- → 6.0 de
g

The cooling device B of this embodiment has the following advantages. The cooling device B corrects the differential value determined according to the target room temperature so as to increase as the outside air temperature decreases. For this reason, even if the cooling is stopped, the room temperature does not become extremely high, and when the outside air temperature is low (for example, 20 ° C.) where there is no possibility that the wireless device 11 or the like is broken, the differential value is corrected so as to increase (see FIG. 4). (A thick broken line), the time from the stop of operation to the operation state can be further extended, and the repetition time of the operation stop and the operation state can be further extended.

Further, when the outside air temperature is high (for example, 45 ° C.),
If the room temperature rises when cooling stops, the differential value is corrected to be small (the thin solid line in FIG. 4).
There is no risk of the wireless device 11 being broken. Even if the outside air temperature is high (for example, 45 ° C.), if the set temperature of the target room temperature is low (for example, 20 ° C.), the correction is made to be small (6d
Even after eg), the time from the stoppage to the operation state is longer than that of the conventional cooling device.

The cooling device B can further reduce the annual cumulative operation time as compared with the cooling device A in the set temperature range of the target room temperature (20 ° C. to 40 ° C.). Therefore, the compressor 2 and the outdoor blower 31 are hardly deteriorated, and energy saving can be achieved. Also, compressor 2
In addition, the outdoor blowers 31 are more difficult to break down, and the number of times of noise generated when they are started and the time of generation of noise generated during their operation can be further reduced.

Next, a third embodiment of the present invention (Claim 1,
3 and 4) will be described with reference to FIGS. The cooling device C differs from the cooling device A in the following points. In the cooling device C, when the target room temperature is the highest (40 ° C.), the differential value is 2.5 deg, and when the target room temperature is the lowest (20 ° C.), the differential value is 1
The differential value is determined steplessly as shown in FIG. 5 so as to be 0.0 deg.

For this reason, in the cooling device C of the present embodiment, in the set temperature range of the target room temperature (20 ° C. to 40 ° C.), the time from the stoppage to the operation state becomes longer than that of the conventional cooling device. It can be further extended, and the operation stop and the operation state are not frequently repeated.

Accordingly, the compressor 2 and the outdoor blower 31 are hardly broken down, and the number of times of noise generated when they are started and the time of generation of noise generated during their operation can be further reduced.

The set temperature range of the target room temperature (20 ° C.
(40 ° C.), the cumulative operation time per year can be further shortened as compared with the conventional cooling device. For this reason, the compressor 2 and the outdoor blower 31 are more unlikely to deteriorate, and energy saving can be achieved.

With a configuration in which the differential value is fixed to a large value (for example, 10.0 deg) regardless of the target room temperature, if the administrator sets the target room temperature as high as 40 ° C., for example, the room temperature is stopped while the cooling operation is stopped. If the temperature of the wireless device does not rise to 50 ° C., the cooling operation does not start, and the wireless device may be damaged by high heat.

However, in the cooling device C, similarly to the cooling device A, even if the manager sets the target room temperature as high as, for example, 40 ° C., the cooling operation starts when the room temperature reaches 42.5 ° C. And the wireless device 11 does not break down. Further, if the manager sets the target room temperature as low as, for example, 20 ° C., the differential value takes a large value of 10.0 deg, so that it is possible to extend the time until the driving state becomes as long as possible, and a large energy saving effect is obtained. Is obtained.

Next, a fourth embodiment of the present invention (Claim 1,
3 and 4) will be described with reference to FIGS. The cooling device D differs from the cooling device C in the following points. When the outside air temperature is low, the room temperature is low, so that even if the detected room temperature falls below the target room temperature and cooling stops, the room temperature does not become extremely high, so that the wireless device 11 and the like in the station building 1 are not broken. For this reason, in the present embodiment, the characteristic curve of the target room temperature-differential value at the outside air temperature of 35 ° C. indicated by the thick solid line in FIG.
(In the range of 0 ° C. to 45 ° C.).

The cooling device D of this embodiment has the following advantages. Even if the cooling is stopped, the room temperature does not become extremely high, and when the outside air temperature is low (for example, 20 ° C.) at which there is no possibility that the wireless device 11 or the like may fail, the slope of the characteristic curve of the differential value rises to the left. Since the correction (broken line in FIG. 6) is performed, the time from the stop of operation to the operation state can be further extended, and the repetition time between the operation stop and the operation state can be further extended.

Further, when the outside air temperature is high (for example, 45 ° C.),
If the room temperature rises when cooling stops, the differential value is corrected so that the slope of the differential value rises to the left (a thin solid line in FIG. 4), so that there is no possibility that the wireless device 11 or the like will break down. In addition, even if the outside air temperature is high (for example, 45 ° C.), if the set temperature of the target room temperature is low (for example, 20 ° C.), even if the inclination is corrected to be small (6 deg), the operation is changed from the stop to the operation. The time required is longer than that of a conventional cooling device.

The cooling device D can further reduce the annual cumulative operating time as compared with the cooling device C in the set temperature range of the target room temperature (20 ° C. to 40 ° C.). Therefore, the compressor 2 and the outdoor blower 31 are hardly deteriorated, and energy saving can be achieved. Also, compressor 2
In addition, the outdoor blowers 31 are more difficult to break down, and the number of times of noise generated when they are started and the time of generation of noise generated during their operation can be further reduced.

The present invention includes the following embodiments in addition to the above embodiment. a. The air conditioner may cool the air in a manned room in which equipment that generates heat is installed (corresponding to claim 2). Appliances with heat generation, for example, cookers such as stoves, OA equipment,
Electric furnace, lighting equipment, etc., the room to be installed, for example,
Kitchens, offices, workshops, studios, etc.

B. The air conditioner is a separate type (indoor unit,
In addition to the (outdoor unit), an indoor and outdoor unit in which the inner and outer units are connected by a flexible duct may be used.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a station building provided with a cooling device according to first to fourth embodiments of the present invention.

FIG. 2 is a block diagram of the cooling device.

FIG. 3 is a graph showing a relationship between a set room temperature and a differential value of the cooling device according to the first embodiment of the present invention.

FIG. 4 is a graph showing a relationship between a set room temperature and a differential value of a cooling device according to a second embodiment of the present invention.

FIG. 5 is a graph showing a relationship between a set room temperature and a differential value of a cooling device according to a third embodiment of the present invention.

FIG. 6 is a graph showing a relationship between a set room temperature and a differential value of a cooling device according to a fourth embodiment of the present invention.

[Description of symbols] A, B, C, D Cooling device (air conditioner) 2 Compressor 3 Outdoor heat exchanger 5 Expansion valve 6 Indoor heat exchanger 7 Refrigerant pipe 8 Controller (control means) 10 Refrigeration cycle (cooling means) Reference Signs List 11 Wireless device (electronic device) 80 Controller (room temperature setting device) 81 Room temperature sensor (air conditioning environment detecting means) 82 Refrigerant temperature sensor (air conditioning environment detecting means) 83 Outside air temperature sensor (air conditioning environment detecting means)

Claims (4)

[Claims] 1. A cooling means capable of cooling air in an unmanned room in which an electronic device generating heat is installed, a room temperature setting device for setting a target room temperature, and an air conditioning environment detecting means for detecting an air conditioning environment including a room temperature. An air conditioner comprising: a control unit that activates the cooling unit when the detected room temperature rises above (target room temperature + differential value) or more, and stops the operation of the cooling unit when the detected room temperature falls below the target room temperature. An air conditioner, wherein the differential value takes a larger value as the set target room temperature is lower. 2. A cooling means capable of cooling the air in a manned room in which a device that generates heat is installed, a room temperature setting device for setting a target room temperature, and an air conditioning environment detecting means for detecting an air conditioning environment including the room temperature. An air conditioner comprising: a control unit that activates the cooling unit when the detected room temperature rises above (target room temperature + differential value) or more, and stops the operation of the cooling unit when the detected room temperature falls below the target room temperature. An air conditioner, wherein the differential value takes a larger value as the set target room temperature is lower. 3. The air conditioner according to claim 1, wherein the differential value determined corresponding to the target room temperature is corrected so as to increase as the outside air temperature decreases. 4. The cooling means comprises: a compressor for compressing a refrigerant, an outdoor heat exchanger for cooling and condensing a high-temperature and high-pressure gas refrigerant with outside air, an expansion valve for expanding a liquid refrigerant, and a low-temperature and low-pressure refrigerant. The air conditioner according to any one of claims 1 to 3, wherein the air conditioner is a refrigeration cycle in which an indoor heat exchanger that exchanges heat with indoor air and evaporates is connected in a ring through a refrigerant pipe.