JP2007085686A - Air conditioning system and its operation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system and its operation method that can avoid the occurrence of a high temperature abnormality or a locally high temperature state in a room to be air-conditioned even during the failure of an air conditioner. <P>SOLUTION: When it is determined that there is no problem in continuing the operation of an indoor blower 4b, whether a highest temperature T(1) computed based on the detection values of temperature sensors T1-Tn in a communication machine chamber 10 exceeds an upper limit temperature Tu (this value is set based on the allowable temperature of storage equipment) is determined (step S14). When the highest temperature T(1) exceeds Tu, the operation of the indoor blower 4b is continued (step S15). When the highest temperature T(1) is the upper limit temperature Tu or less, whether the difference between the indoor highest temperature T(1) and the lowest temperature T(n) exceeds a predetermined limit temperature difference ΔTu is determined (step S16). When exceeding ΔTu, the operation of the indoor blower 4b is continued (step S15). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioning system and an operation method thereof, and more particularly, to an air conditioning system suitable for operation when an air conditioner installed in a machine room storing information communication devices fails and an operation method thereof.

  Conventionally, an air conditioner (hereinafter also referred to as an air conditioner) has a microcomputer in an indoor unit control unit, and the control unit determines a failure location of the air conditioner and determines whether to continue operation or display a failure location. It is. In this case, for example, in the case of an abnormality in the refrigerant circulation system such as a high-pressure abnormality of the compressor or a malfunction of the four-way valve, it is common to stop the operation of the equipment and to stop the indoor unit blower accordingly (for example, patents) Reference 1).

However, for example, in the case of an air conditioner installed in a machine room that stores information communication equipment, etc., if the operation of the indoor unit blower continues for a long time, the room becomes hot due to the heat generated by the equipment, or the temperature is locally high. It will be in the state where this part occurs. In general, the permissible temperature of information communication equipment is about room temperature, and when the ambient air becomes hot, the equipment itself automatically stops due to protection control and communication service cannot be continued. There is also a risk of destruction and failure.
JP-A-9-243138

  The present invention is for solving such a problem, and even when the air conditioner fails, it is possible to avoid that the temperature in the air-conditioned room becomes abnormally high or a locally high temperature state. An air conditioning system and an operation method thereof are provided.

  (1) An air conditioning system operating method according to the present invention includes an air conditioner including a refrigerant circulation system and an indoor unit blower, and means for acquiring detected temperatures of a plurality of cooling target locations. In the system, when a failure occurs in the air conditioner, if the indoor unit blower can be operated, it is continuously operated (Claim 1).

(2) In this case, the failure is a failure of the refrigerant circulation system (claim 2).
(3) Further, it is further characterized in that the calculated value based on the detected temperature exceeds the first threshold value as a condition for continuing the indoor unit blower (Claim 3).
(4) The calculated value is a deviation of a plurality of detected temperatures (claim 4).
Here, as the “deviation”, for example, any of a maximum deviation, a quartile deviation, an average deviation, a standard deviation, etc., which are deviations between the highest temperature and the lowest temperature, can be used.
The “first threshold value” can be determined based on the allowable temperature in the air-conditioned room.
(5) The deviation is a deviation between a maximum temperature and a minimum temperature among a plurality of detected temperatures (claim 5).
Deviations in this case are T1, T2,... Tn, respectively, where the plurality of cooling target part temperatures are T1, T2,..., Tn, and T (1) ≧, T (2) ≧. When ≧ T (n), it means a value represented by T (1) −T (n).

(6) The calculated value is a maximum temperature among a plurality of detected temperatures (claim 6).
(7) The deviation of the plurality of detected temperatures exceeds the first threshold, and the highest temperature among the plurality of detected temperatures exceeds the second threshold. Condition (Claim 7).
(8) The calculated value based on the detected temperature is a double bed temperature (claim 8).
(9) The calculated value is a deviation between a maximum temperature of a plurality of detected temperatures and a double bed temperature (claim 9).

According to each invention, when there is no hindrance to the operation of the indoor unit blower, the room air is forcibly circulated even if a failure occurs in another part, thereby preventing the occurrence of an abnormally high temperature or local high temperature in the room. be able to. As a result, when applied to a machine room or the like for storing information communication devices, it is possible to avoid troubles such as failure to continue service due to automatic stop of communication devices and failure due to destruction of device components.
In the invention using the double floor temperature as the detected temperature, the cold storage heat in the double floor can be effectively radiated indoors.

  Hereinafter, an embodiment of a non-dehumidifying operation control method according to the present invention will be described in more detail with reference to FIGS. In order to avoid duplication, in each figure, the same structure is shown using the same code | symbol. Needless to say, the scope of the present invention is described in the claims and is not limited to the following embodiments.

(First embodiment)
FIG. 1 is a diagram showing an air conditioning system 1 according to the first embodiment. Air conditioning control of the air conditioning system 1 is performed by the air conditioner 2 installed near the wall surface of the communication machine room 10 having a double floor structure. The air conditioner 2 has an indoor unit 4, an outdoor unit 3, a compressor 5 (described later) and a refrigerant pipe 7 connecting them as main components, generates cold air by a refrigeration cycle operation described later, and supplies it to the communication machine room 10. The floor of the communication machine room 10 is partitioned by a floor panel 10a, and a double floor space 11 is formed. Further, the ceiling part is partitioned by a ceiling plate 10b, and a ceiling space 12 is formed. The indoor unit 4 and the double floor space 5 are connected via a forward duct 19. The ceiling space 12 and the air conditioner 2 are connected via a return side duct 18. Inside the communication machine room 10, equipment storage racks 16a to 16c storing information communication devices (not shown) are installed. Among these, the rack 16a is a front intake type, the rack 16b is a front lower intake type, and the rack 16c is a lower intake type. Looking at the rack 16a, the cool air introduced from the front of the equipment is discharged from the upper fan (not shown) to the outside of the rack after the equipment mounted inside is cooled. The same applies to other types of racks. In the vicinity of the ceiling of the communication machine room 10, temperature sensors T1 to Tn are attached, and configured to detect warm air discharged from the racks 16a to 16c. The detection value of each temperature sensor is transmitted to the control unit 8 via the communication line C1.

  FIG. 2 is a diagram showing a detailed configuration of the air conditioner 2. The air conditioner 2 mainly includes an outdoor unit 3, an indoor unit 4, a compressor 5, an expansion valve 6, a refrigerant circulation pipe 7 connecting them, and a control unit 8 that controls operation of the air conditioning system. The indoor unit 4 includes an evaporator 4a and an indoor unit blower 4b. The sucked room air is cooled by the evaporator 4a and is sent to the communication machine room 10 by the indoor unit blower 4b. The refrigerant circulation pipe 7 is filled with a chlorofluorocarbon refrigerant, and is configured to circulate in the gas phase or liquid phase. The outdoor unit 3 installed outdoors incorporates a compressor 5, a condenser 3a, and an outdoor unit blower 3b. The condenser 3a exchanges heat with high-temperature and high-pressure gas refrigerant with the outside air. It cools and condenses and is conveyed to the indoor unit 4 through the refrigerant circulation pipe 7. In the vicinity of the outlet of the compressor 5, a pressure / temperature sensor 5a for detecting the refrigerant pressure and temperature is attached. The operating state of each component is transmitted to the control unit 8 via communication lines C2 to C4. The control unit 8 includes a CPU, a RAM, a ROM, a storage unit, and the like (not shown), and is stored in the ROM based on the detection value of each sensor, the outdoor unit fan 3b air volume, the indoor unit fan 4b air volume, and the like. Operation control of the air conditioner 2 is performed according to a predetermined program, and when a failure occurs, control described later is performed according to the failure determination program. The air conditioner 2 includes various elements constituting the refrigeration cycle such as a four-way valve, an accumulator, and a four-way valve, but the illustration is omitted.

  With the above configuration, the cold air generated by the evaporator 4a is sent to the double floor space 11 by the indoor unit blower 4b via the forward duct 19 and supplied indoors from the plurality of outlets 14 provided in the floor panel 10a. The The air that rises after the room is cooled is guided to the ceiling space 12 through a plurality of inlets 15 provided in the ceiling plate 10 b and is returned to the indoor unit 4 through the return side duct 18. The return side air is mixed with outside air introduced through the outside air introduction duct 20.

  Next, a control flow when the air conditioner 2 is in failure will be described with reference to FIG. In the present embodiment, a failure in which the compressor 5 stops due to a high pressure abnormality will be described as an example. After starting the operation, when the controller 8 detects a high-pressure abnormal failure of the compressor 5 based on the detected value of the pressure / temperature sensor 5a (step S11), it immediately stops the operation of the compressor 5 (step S12). Next, it is determined whether or not it is possible to continue the operation of the indoor unit blower 4b due to the failure (step S13). When the operation cannot be continued, the operation including the indoor unit blower 4b is completely stopped (step S17).

  When it is determined that there is no problem in the continuation of the operation of the indoor unit blower 4b due to the failure of the refrigerant circulation system as in the present embodiment, then, based on the detection values of the temperature sensors T1 to Tn in the communication machine room 10. It is determined whether or not the calculated maximum temperature T (1) exceeds the upper limit temperature Tu (this value is set based on the allowable temperature of the storage devices) (step S14). When the temperature exceeds Tu, the operation of the indoor unit blower 4b is continued (step S15), and the room air is forced to circulate, thereby avoiding a rise in room temperature and occurrence of a local abnormally high temperature. The air volume of the indoor unit blower 4b in this case maintains the air volume immediately before the failure.

  When the temperature is not more than the upper limit temperature Tu, it is further determined whether or not the difference between the indoor maximum temperature T (1) and the minimum temperature T (n) exceeds a predetermined limit temperature difference ΔTu (step S16). When ΔTu is exceeded, the operation of the indoor unit blower 4b is continued (step S15). When the operation cannot be continued, the operation of the indoor unit blower 4b is stopped (step S17).

In this embodiment, the compressor high-pressure abnormal failure is taken as an example. However, the present invention is not limited to this, and a failure in other parts is also determined by the same flow.
Further, in this embodiment, T (1)> Tu and T (1) −T (n)> ΔTu are set as conditions for the indoor unit blower operation. It is good.
Further, the determination can be made not with the maximum deviation but with the standard deviation. Furthermore, you may determine by average temperature.

(Second embodiment)
Next, another embodiment of the present invention will be described. This embodiment mainly relates to claim 9. FIG. 4 is a diagram showing an air conditioning system 30 according to the present embodiment. The air conditioning system 30 is different from the air conditioning system 1 according to the first embodiment in that the temperature sensor T0 is provided in the double floor space 11, and the detected temperature (double floor temperature) T0 is a communication. It is transmitted to the control unit 8 via the line C2. Since the other structure is the same as the air conditioning system 1, description is abbreviate | omitted.

  Next, a control flow when the air conditioner 2 is in failure will be described with reference to FIG. This embodiment will be described by taking as an example a failure in which the compressor 5 stops due to a high pressure abnormality. After starting the operation, when the controller 8 detects a high-pressure abnormal failure of the compressor 5 based on the detected value of the pressure / temperature sensor 5a (step S21), it immediately stops the operation of the compressor 5 (step S22). Next, it is determined whether or not the operation of the indoor unit blower 4b can be continued due to the failure (step S23). When the operation cannot be continued, the operation including the indoor unit blower 4b is completely stopped (step S26). If it is determined that there is a problem with the refrigerant circulation system and there is no problem in the continuation of the operation of the indoor unit blower 4b, then the maximum temperature T (calculated based on the detected temperatures of the temperature sensors T1 to Tn in the communication machine room 10 1) and whether or not the deviation between the double bed temperature T0 exceeds a predetermined threshold value (α) (step S24). When the threshold (α) is exceeded, the operation of the indoor unit blower 4b is continued (step S25), and the room air is forcibly circulated, thereby avoiding a rise in room temperature and occurrence of local abnormally high temperatures. The air volume of the indoor unit blower 4b in this case maintains the air volume immediately before the failure. When it is equal to or less than the threshold value (α), the operation of the indoor unit blower 4b is stopped (step S26).

  The present invention is widely applicable to air conditioning systems regardless of heat source type, refrigerant type, air conditioning system, building structure, and the like.

It is a figure showing air harmony system 1 concerning a first embodiment. It is a figure which shows the detail of the air conditioning machine. It is a figure which shows the operation control flow at the time of the air conditioner 2 failure in the air conditioning system 1. FIG. It is a figure which shows the air conditioning system 30 which concerns on 2nd embodiment. It is a figure which shows the operation control flow at the time of the air conditioner 2 failure in the air conditioning system 30. FIG.

Explanation of symbols

1.30 ... Air conditioning system 2 .... Air conditioner 3 .... Outdoor unit 4 .... Indoor unit 4b ... Indoor unit blower 5 .... Compressor 8 .... Control units 16a to 16c ... equipment storage racks T0 to Tn ... temperature sensors

Claims (9)

In an air conditioning system comprising an air conditioner including a refrigerant circulation system, an indoor unit blower, and a means for acquiring detected temperatures of a plurality of cooling target locations,
An operating method of an air conditioning system, wherein when an air conditioner fails, when the indoor unit blower is operable, the indoor unit blower is continuously operated. The method of operating an air conditioning system according to claim 1, wherein the failure is a failure of the refrigerant circulation system. The operating method of the air conditioning system according to claim 1 or 2, wherein the calculation value based on the detected temperature exceeds a first threshold value as a condition for continuous operation of the indoor unit blower. The method of operating an air conditioning system according to claim 1, wherein the calculated value is a deviation of a plurality of detected temperatures. The method of operating an air conditioning system according to claim 4, wherein the deviation is a deviation between a maximum temperature and a minimum temperature among a plurality of detected temperatures. The operation method of the air conditioning system according to claim 1, wherein the calculated value is a maximum temperature among a plurality of detected temperatures. The deviation of the plurality of detected temperatures exceeds the first threshold, and the maximum temperature among the plurality of detected temperatures exceeds the second threshold is further set as a condition for continuous operation of the indoor unit blower. The operation method of the air conditioning system according to any one of claims 1 to 3. The operation value of the air conditioning system according to claim 3, wherein the calculated value based on the detected temperature is a double bed temperature. The operation method of the air conditioning system according to claim 3, wherein the calculated value is a deviation between a maximum temperature of a plurality of detected temperatures and a double bed temperature.

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