WO2016178290A1 - Air conditioning system - Google Patents

Abstract

An air conditioning system 1 according to the present invention is provided with: an air conditioning device 5 that has an indoor fan 140 and performs air conditioning in an air-conditioning target space 2; an inlet temperature sensor 160 that detects the temperature of air flowing into the air conditioning device 5; and an indoor control device 180 that controls, when the air conditioning device 5 performs a blower operation action, the indoor blast volume to be blown to the air-conditioning target space 2 by the indoor fan 140, on the basis of a setting temperature for the air-conditioning target space 2, which is set in advance, and a temperature detected by the inlet temperature sensor 160. The air conditioning system 1 stabilizes the temperature of air in the air-conditioning target space 2 and improves the reliability.

Description

Air conditioning system

This invention relates to an air conditioning system. In particular, the present invention relates to air volume control supplied to the air-conditioning target space.

Conventionally, for example, each air conditioning apparatus in an air conditioning system installed in a computer room or the like is generally operated by driving a blower by a fan motor via a pulley and a V belt to operate at a constant air volume. In addition, there is a type in which a blower is directly attached to a fan motor and an inverter circuit is driven to change the air volume. However, it is common that the air volume is changed during the cooling operation by driving the compressor. While the compressor is stopped, the air volume (indoor air volume) in the air-conditioning target space (indoor) is the same as that before the stop, or a predetermined constant air volume (see, for example, Patent Document 1). ).

Japanese Patent Laid-Open No. 10-038355

In recent years, for example, in an air conditioning system installed in a data center or the like, a method of taking in air (outside air) in a building and cooling the air-conditioned space by blowing air has attracted attention. By stopping the compressor, the consumption of energy used for temperature adjustment can be reduced.

When performing cooling using outside air, the suction temperature of the air conditioner (indoor unit) varies depending on the outside air. Further, when the compressor is stopped, air conditioning by the refrigerant circuit is not performed, so that the blowing temperature becomes substantially equal to the suction temperature. Therefore, the blowout temperature of the air conditioner when performing cooling with outside air varies depending on the outside air temperature (the temperature of the air flowing into the air conditioner).

On the other hand, in the air conditioner when the compressor is stopped, the indoor air flow is constant. For example, if the outside air temperature is high, the temperature of the air-conditioning target space will increase. Conversely, when the outside air temperature is low, the temperature of the air-conditioning target space is excessively lowered when the temperature of the air-conditioning target space is low. For this reason, it will shift to the temperature state which is unpreferable for communication apparatuses, such as dew condensation and a fall of absolute humidity. For this reason, the temperature in the air-conditioning target space is not stable. If the temperature in the air-conditioning target space is not stable, for example, the stable operation and reliability of the device in the air-conditioning target space may be impaired.

The present invention has been made in order to solve the above-described problems. For example, an object of the present invention is to obtain an air conditioning system capable of stabilizing the temperature of an air-conditioning target space even when performing a blowing operation. .

An air conditioning system according to the present invention includes a blower, an air conditioning apparatus that performs air conditioning in an air-conditioning target space, an intake air temperature sensor that detects the temperature of air flowing into the air conditioning apparatus, and the air conditioning apparatus that performs air blowing operation. When the operation is performed, a control device is provided that controls the amount of air that the blower sends to the air-conditioning target space from the preset temperature of the air-conditioning target space and the detected temperature of the intake air temperature sensor.

According to the air conditioning system of the present invention, even in the blowing operation when the compressor is stopped, the control device controls the indoor blowing amount of air supplied by the blower into the air-conditioning target space. Air temperature can be stabilized and reliability can be improved.

It is a figure showing an example of outline composition, such as a building which has air harmony system 1 concerning an embodiment of this invention. It is a figure showing the structural example of the air conditioning apparatus 5 which concerns on embodiment of this invention. It is a figure explaining the flow of control which the indoor control apparatus 180 performs in the air conditioning system 1 which concerns on embodiment of this invention.

Hereinafter, an air conditioning system according to an embodiment of the invention will be described with reference to the drawings. Here, in FIG. 1 and the following drawings, the same reference numerals denote the same or corresponding parts, and are common to the whole text of the embodiments described below. And the form of the component represented by the whole specification is an illustration to the last, Comprising: It does not limit to the form described in the specification. In particular, the combination of the components is not limited to the combination in each embodiment, and the components described in the other embodiments can be applied to another embodiment. Furthermore, when there is no need to distinguish or specify a plurality of similar devices that are distinguished by subscripts or branch numbers, the subscripts may be omitted. In the drawings, the size relationship of each component may be different from the actual one. The level of temperature, pressure, etc. is not particularly determined in relation to absolute values, but is relatively determined in terms of the state and operation of the system and apparatus.

FIG. 1 is a diagram showing a schematic configuration example of a building having an air conditioning system 1 according to an embodiment of the present invention. The air conditioning system 1 of the present embodiment is a system that cools the air conditioning target space 2 by sending air that has been subjected to air conditioning or the like into the air conditioning target space 2 in which the cooling target device 13 that generates heat is installed. The air conditioning system 1 cools the air-conditioning target space 2 to prevent the temperature of the cooling target device 13 from rising.

Here, the air conditioning target space 2 in the following description is, for example, a space in a building such as a room, a data center, a server room, a room in a building, a warehouse, and the like. It is assumed that the air-conditioning target space 2 of the present embodiment is a server room. And the cooling object apparatus 13 in this Embodiment shall be the information communication apparatus stored, for example in the shelf (server rack, cabinet, etc.). The information communication device sucks air in the air-conditioning target space 2 and exhausts it through the inside. In the present embodiment, in the air conditioning target space 2, a plurality of information communication devices (cooling target devices 13) are stored on the shelf so that the exhaust surfaces face each other.

Further, in the present embodiment, in addition to the air-conditioning target space 2, an underfloor air blowing space 3 and a ceiling air blowing space 4 are provided. The underfloor ventilation space 3 is a space serving as a flow path for air sent from the air conditioner 5 to the air conditioning target space 2. The air-conditioning target space 2 and the underfloor ventilation space 3 are partitioned by a floor panel 2a. In a part of the floor panel 2a, the air-conditioning target space 2 and the underfloor ventilation space 3 communicate with each other, and the air that has passed through the underfloor ventilation space 3 is sent into the air-conditioning target space 2. The ceiling blast space 4 is a space serving as a flow path for the air that the air conditioner 5 sucks and the air that the cooling target device 13 discharges.

<Description of configuration>
As shown in FIG. 1, the air conditioning system 1 of the present embodiment includes an air conditioning apparatus 5 (the indoor unit 100 is shown in FIG. 1), an air conditioning apparatus duct 6, and an equipment exhaust heat duct. 7, an exhaust fan 8, an exhaust gallery 9, an air supply fan 10, an air supply gallery 11, and a switching damper 12. In the present embodiment, the air conditioner 5, the air conditioner duct 6, and the equipment exhaust heat duct 7 are installed in the air conditioning target space 2. Further, the exhaust fan 8, the exhaust gallery 9, the air supply fan 10, the air supply gallery 11, and the switching damper 12 are installed in the ceiling air space 4.

The air conditioner duct 6 serves as an air flow path between the air conditioner 5 and the ceiling ventilation space 4. The air that passes through the air conditioner duct 6 flows from the ceiling ventilation space 4 side to the air conditioner 5 side. The equipment exhaust heat duct 7 serves as an air flow path between the air-conditioning target space 2 and the ceiling ventilation space 4. In the air conditioning target space 2, the air discharged from the cooling target device 13 passes through the device exhaust heat duct 7 and flows toward the ceiling air blowing space 4.

The exhaust blower 8 is a blower that discharges air in the ceiling blower space 4 (particularly, air that has passed through the equipment exhaust heat duct 7) to the outside of the building. Further, the exhaust louver (louver) 9 is a ventilation window installed at a ventilation opening between the exhaust side of the ceiling ventilation space 4 and the space outside the building. The air supply blower 10 is a blower that allows air outside the building to flow into the ceiling blower space 4. The air supply louver (louver) 11 is a ventilation window installed at a ventilation opening between the intake side of the ceiling ventilation space 4 and the space outside the building. The switching damper 12 switches whether the intake side and the exhaust side of the ceiling blast space 4 are communicated or separated.

FIG. 2 is a diagram illustrating a configuration example of the air-conditioning apparatus 5 according to the embodiment of the present invention. In the air conditioner 5 of FIG. 2, an outdoor unit (outdoor unit) 200 and an indoor unit (indoor unit) 100 are connected by a gas refrigerant pipe 300 and a liquid refrigerant pipe 400. The compressor 210, the condenser 220, the expansion valve 120, and the evaporator 130 constitute a refrigerant circuit.

The outdoor unit 200 has a compressor 210 and a condenser 220. The compressor 210 compresses and discharges the sucked refrigerant. Here, although not particularly limited, the compressor 210 changes the capacity of the compressor 210 (the amount of refrigerant sent out per unit time) by arbitrarily changing the operating frequency by, for example, an inverter circuit. You may be able to do that. In addition, the condenser 220 performs heat exchange between the refrigerant and air (for example, air outside the building) to condense and liquefy the refrigerant.

The indoor unit 100 includes an expansion valve 120, an evaporator 130, and an indoor blower 140. The expansion valve 120 serving as a decompression device (a throttling device) decompresses and expands the refrigerant that has passed through the liquid refrigerant pipe 400. For example, in the case of an electronic expansion valve or the like, the opening degree is adjusted based on an instruction from an indoor control device 180 or the like described later, and the pressure and flow rate of the refrigerant can be adjusted. The evaporator 130 performs heat exchange between the air flowing in from the air conditioner duct 6 and the refrigerant decompressed by the expansion valve 120. The refrigerant passing through the evaporator 130 takes the heat of the air, evaporates, and vaporizes. On the other hand, the air is cooled.

The indoor blower 140 forms an air flow that passes through the air conditioner 5. In the present embodiment, air from the air conditioner duct 6 flows into the air conditioner 5. Moreover, the air which passed the air conditioning apparatus 5 is sent into the underfloor ventilation space 3. FIG. Here, indoor blower 140 of the present embodiment can change the number of rotations based on an instruction from indoor control device 180 described later. Thereby, the indoor blower 140 can increase or decrease the air volume of the air sent into the underfloor ventilation space 3.

Moreover, the indoor unit 100 has a detection device for detecting temperature and the like as shown in FIG. In the present embodiment, a blowout temperature sensor 150, a suction temperature sensor 160, and an indoor temperature sensor 170 are provided. The blowing temperature sensor 150 detects the temperature of the air that the indoor blower 140 sends into the underfloor ventilation space 3. The suction temperature sensor 160 detects the temperature of the air that passes through the air conditioner duct 6 and flows into the air conditioner 5. Furthermore, the indoor temperature sensor 170 detects the temperature of the air in the air-conditioning target space 2 (the temperature of the air sucked by the cooling target device 13). In the present embodiment, an operating device 190 described later has an indoor temperature sensor 170.

Furthermore, the indoor unit 100 has an indoor control device 180. The indoor control device 180 includes an arithmetic device such as a microcomputer equipped with a general-purpose CPU (Central Processing Unit), a data bus, an input / output port, a nonvolatile memory, a timer, and the like. The indoor control device 180 is based on data relating to the operation such as the temperature of the air in the air-conditioning target space 2, the set temperature of the air conditioner 5, and the temperature of the refrigerant pipe, for example, the opening degree of the expansion valve 120 and the rotation speed of the indoor blower 140. Control etc. In the present embodiment, the rotational speed of indoor blower 140 is controlled based on the temperature detected by suction temperature sensor 160 and indoor temperature sensor 170 and the set temperature of air conditioner 5 in particular. The operation device 190 includes, for example, an input device that is input by an operator (user, operator, etc.), a display device that displays the temperature of air in the air-conditioning target space 2 to the operator, and the like.

Next, the air flow in the present embodiment will be described. As will be described later, the air flow differs depending on whether the air conditioner 5 performs a cooling operation (normal operation) or a blowing operation when the compressor is stopped. The air flow in the normal operation is indicated by a dotted arrow in FIG. Further, the air flow in the air blowing operation when the compressor is stopped is indicated by a solid line arrow in FIG.

In the normal operation, the switching damper 12 is open and the intake side and the exhaust side of the ceiling air blowing space 4 are in communication with each other. The cooling target device 13 in the air conditioning target space 2 sucks air in the air conditioning target space 2. The cooling target device 13 absorbs the sucked air and exhausts it. The air exhausted by the cooling target device 13 passes through the device exhaust heat duct 7 and is sent to the ceiling ventilation space 4. The air discharged into the ceiling air blowing space 4 flows into the air conditioner 5 through the air conditioner duct 6. The air that has flowed in passes through the air conditioner duct 6 and flows into the air conditioner 5. The air that has passed through the air conditioner 5 passes through the underfloor ventilation space 3 and flows into the air-conditioning target space 2.

On the other hand, in the case of the air blowing operation when the compressor is stopped, the switching damper 12 is in a closed state. The air supply blower 10 is driven, and air flows from the outside of the building through the air supply gallery 11. The air that has flowed in passes through the air conditioner duct 6 and flows into the air conditioner 5. The air that has passed through the air conditioner 5 passes through the underfloor ventilation space 3 and flows into the air-conditioning target space 2. The cooling target device 13 in the air conditioning target space 2 sucks the air in the air conditioning target space 2 and absorbs the sucked air to exhaust it. The air discharged into the ceiling blower space 4 passes through the exhaust gallery 9 and is discharged outside the building when the exhaust blower 8 is driven.

<Operation of the air conditioner 5>
Next, the driving | running operation | movement of the air conditioning apparatus 5 in this Embodiment etc. are demonstrated. The air conditioner 5 of the present embodiment can perform a cooling operation (normal operation) or a blowing operation when the compressor is stopped.

(Normal operation)
First, normal operation will be described. In normal operation, the air conditioner 5 cools the air flowing from the air conditioner duct 6 by circulating the refrigerant in the refrigerant circuit, and supplies the air to the air conditioning target space 2. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 210 flows into the condenser 220. Then, the refrigerant (liquid refrigerant) condensed and liquefied by passing through the condenser 220 and exchanging heat with outdoor air flows out of the outdoor unit 200.

The refrigerant that has flowed out of the outdoor unit 200 passes through the liquid refrigerant pipe 400 and flows into the indoor unit 100. In the indoor unit 100, the refrigerant flows into the expansion valve 120. The refrigerant depressurized by the expansion valve 120 flows into the evaporator 130. The refrigerant flowing into the evaporator 130 evaporates and gasifies by exchanging heat with the air flowing in from the air conditioner duct 6 to become a gas refrigerant and flows out from the indoor unit 100.

The gas refrigerant flowing out from the indoor unit 100 passes through the gas refrigerant pipe 300 and flows into the outdoor unit 200. Then, it is sucked into the compressor 210 again. As described above, the refrigerant in the air conditioner 5 (refrigerant circuit) is circulated, and air is supplied so that the air-conditioning target space 2 reaches the set temperature.

At this time, the indoor control device 180 controls the rotational speed of the indoor blower 140 based on the set temperature of the air-conditioning target space 2 set in the air conditioning device 5 and the detected temperature of the blowout temperature sensor 150. Or you may make it control the rotation speed of the indoor air blower 140 based on the preset temperature of the air conditioning apparatus 5, and the detected temperature of the suction temperature sensor 160. FIG.

<Blower operation when compressor stops>
FIG. 3 is a diagram illustrating the flow of control performed by the indoor control device 180 in the air conditioning system 1 according to the embodiment of the present invention. In the air-conditioning apparatus 5 (air-conditioning system 1) of the present embodiment, as described above, the compressor 210 is stopped to perform normal operation (for example, blowing air that has taken in air outside the building (outside air)). It is possible to perform a blowing operation without performing a cooling operation. Here, in the present embodiment, it is assumed that the indoor control device 180 determines whether or not the air-conditioning apparatus 5 performs a normal operation (whether or not an air-blowing operation is performed). However, for example, the operator may instruct the indoor control device 180 to perform the air blowing operation via the operation device 190 or the like.

When determining whether or not to perform the air blowing operation, the indoor control device 180 calculates a deviation ΔTic1 between the set temperature Ticm of the air-conditioning target space 2 set in the air conditioner 5 and the detected temperature T1 of the suction temperature sensor 160 in S101. (S101). In S102, a deviation ΔTic3 between the set temperature Ticm of the air conditioner 5 and the detected temperature T3 of the indoor temperature sensor 170 is calculated (S102).

In S103, it is determined whether or not the value of the deviation ΔTic1 exceeds a preset reference temperature W ° C. (for example, 2 ° C.) (S103). If it is determined that it has exceeded, the process of S104 is performed, and if it is determined that it has not exceeded, the process of S107 is performed.

In S104, it is determined whether or not the value of the deviation ΔTic3 exceeds a preset reference temperature Y ° C. (for example, 2 ° C.). If it determines with having exceeded, in S105, the control which increases the rotation speed of the indoor air blower 140 will be performed, the indoor air flow will be increased (S105), and it will progress to S101. If it is determined that it has not exceeded, in S106, control is performed to reduce the rotational speed of the indoor fan 140, the amount of indoor air is reduced (S106), and the process proceeds to S101 to continue the processing.

In S107, it is determined whether or not the value of the deviation ΔTic1 exceeds a preset reference temperature X ° C. (for example, 2 ° C.) (S107). If it is determined that the number has exceeded, the process of S108 is performed. If it is determined that it has not exceeded, in S111, control is performed to increase the rotational speed of the indoor fan 140, the amount of indoor air is increased (S111), and the process proceeds to S101 to continue the processing.

In S108, it is determined whether or not the value of the deviation ΔTic3 exceeds a preset reference temperature Z ° C. (for example, 2 ° C.). If it is determined that it exceeds, in S109, control is performed to increase the rotational speed of the indoor fan 140, the amount of indoor air is increased (S109), and the process proceeds to S101. If it is determined that it does not exceed, in S110, control is performed to decrease the rotational speed of the indoor fan 140, the amount of indoor air is reduced (S110), and the process proceeds to S101 to continue the processing.

Here, the reference temperatures W ° C., X ° C., Y ° C., and Z ° C. are set according to the heat-resistant temperature of the device 13 to be cooled.

As described above, according to the air conditioning system 1 of the present embodiment, the indoor control device 180 controls the number of rotations of the indoor blower 140 in the air-conditioning target space 2 even in the blowing operation when the compressor is stopped. By adjusting the amount of air blown into the room, the temperature of the air in the air-conditioned space 2 can be stabilized and the reliability can be improved. For example, when the intake air temperature is higher than the set temperature and the temperature of the air-conditioning target space 2 is high, or when the intake air temperature is low and the temperature of the air-conditioning target space 2 is low, the cooling is performed when the indoor air flow rate is increased. When the temperature goes to a temperature that is not suitable for the target device, the indoor air flow rate can be reduced. The air conditioning system 1 according to the present embodiment is particularly suitable when cooling is performed by exhausting heat from a cooling target device 13 such as a communication device in the air conditioning target space 2.

Moreover, in the air conditioning system 1 of this Embodiment, in the ventilation driving | operation operation | movement at the time of a compressor stop, the rotation speed of the indoor air blower 140 from the preset temperature and the suction temperature of the air which flows into the air conditioning apparatus 5 in the indoor control apparatus 180 As a result, the air can be supplied with the amount of air blown indoors in accordance with the amount of heat that sets the air-conditioned space 2 to a set temperature. Also, the indoor control device 180 can control the rotation speed of the indoor blower 140 based on the set temperature and the temperature of the air-conditioning target space 2 so that air can be supplied with the indoor air blowing amount corresponding to the set temperature.

Furthermore, according to the air conditioning system of the present embodiment, since the operating device 190 of the air conditioning apparatus 5 in the air conditioning target space 2 is provided with the room temperature sensor 170, for example, the air to be supplied to the cooling target device 13 It is possible to more accurately detect the temperature of the air-conditioning target space 2 as the temperature.

1 Air conditioning system, 2 Air conditioning target space, 2a Floor panel, 3 Underfloor air space, 4 Ceiling air space, 5 Air conditioner, 6 Air conditioner duct, 7 Equipment exhaust heat duct, 8 Exhaust fan, 9 Exhaust Louver, 10 air blower, 11 air louver, 12 switching damper, 13 cooling target device, 100 indoor unit, 120 expansion valve, 130 evaporator, 140 indoor blower, 150 outlet temperature sensor, 160 suction temperature sensor, 170 indoor temperature sensor, 180 indoor control device, 190 actuator, 200 outdoor unit, 210 compressor, 220 condenser, 300 gas refrigerant pipe, 400 liquid refrigerant pipe.

Claims (5)

An air conditioner having a blower and performing air conditioning of the air-conditioning target space;
An intake air temperature sensor for detecting the temperature of air flowing into the air conditioner;
A control device for controlling the amount of air sent by the blower to the air-conditioning target space from a preset temperature of the air-conditioning target space and a temperature detected by the intake air temperature sensor when the air conditioner performs a blowing operation; Air conditioning system with A target space temperature sensor for detecting the temperature of the air conditioning target space;
The air conditioning system according to claim 1, wherein the control device determines the air volume of the blower from a set temperature of the air-conditioning target space and a temperature related to detection by the target space temperature sensor. It further has an operating device that is installed in the air conditioning target space and operates the air conditioner,
The air conditioning system according to claim 2, wherein the target space temperature sensor is installed in the operation device. When the control device determines that the difference between the set temperature of the air-conditioning target space and the temperature related to detection by the target space temperature sensor exceeds the first temperature difference, the control device increases the air volume of the blower, The air conditioning system according to claim 2 or 3, wherein when it is determined that the temperature difference is not exceeded, the air volume of the blower is controlled to be reduced. The air conditioning system according to any one of claims 1 to 4, wherein the heat generating device installed in the air conditioning target space is a cooling target.

Images