JP2017211130A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system that can supply heat with high energy efficiency, and can reduce energy loss.SOLUTION: An air conditioning system 1A comprises a heat pump 20A, and a boiler 30. The air conditioning system 1A comprises: a compressor rotation speed detection device 50 for detecting an operating state of the heat pump 20A; and a control device 40 for controlling a start and a stop of operation of the boiler 30 depending on a compressor rotation speed indicating the operating state detected by the compressor rotation speed detection device 50.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioning system including a boiler and a heat pump.

  Conventionally, various inventions have been proposed as an air conditioning system for adjusting the internal temperature of buildings and public facilities. Some of the inventions related to such an air conditioning system aim to reduce energy loss. For example, Patent Document 1 includes a plurality of energy supply devices such as a boiler, a steam absorption chiller, and a hot water absorption chiller, and predicts a temporal variation pattern of daily energy consumption. An air conditioning system has been disclosed that reduces the loss of energy due to load fluctuations by controlling the start / stop timing of each energy supply device or the load distribution of each energy supply device so that the energy consumption is minimized. Yes.

JP 2001-65959 A

  However, the air conditioning system described in Patent Literature 1 predicts a daily energy consumption pattern based on data collected in advance, and controls the timing of starting and stopping of each energy supply device based on the prediction. . In other words, since each energy supply device is not controlled in accordance with the actual energy consumption situation, there is a problem that if a deviation from the prediction occurs, the energy loss increases accordingly. Moreover, although it is described in Patent Document 1 that correction processing is performed when a deviation occurs from the prediction, energy loss increases at least until correction is performed. . Further, there is a possibility that a deviation occurs after the correction process is performed, and the energy loss increases as the number of times the correction process is performed increases.

  Further, Patent Document 1 describes that main heat supply is performed by a boiler, but the boiler supplies heat by burning fossil fuel, and it is difficult to say that the energy efficiency is high. .

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an air conditioning system that can supply heat with high energy efficiency and can reduce energy loss.

  An air conditioning system according to an aspect of the present invention is an air conditioning system including a heat pump and a boiler, an operating state detecting device that detects an operating state of the heat pump, and an operating state detected by the operating state detecting device. And a control device that controls the start and stop of the operation of the boiler.

  As a result, high energy efficiency is realized by usually supplying heat with a heat pump, and the boiler is also operated according to the operation state of the heat pump, so the possibility of shortage of heat supply is low and energy loss is also low. Can be reduced.

  In the air conditioning system, when the boiler is in a stopped state, the control device operates the boiler if the detected value of the operation state detected by the operation state detection device is equal to or greater than a first threshold value. The boiler may be stopped when the detected value falls below a second threshold value when the boiler is in an operating state.

  As a result, when the detected value of the driving state is equal to or higher than the first threshold, the operation of the boiler is started, and when the detected value of the driving state is equal to or lower than the second threshold, the boiler is stopped. Heat can be supplied and energy loss can be reduced. Moreover, it is unlikely that the amount of heat supply will be insufficient, and heat can be supplied with high energy efficiency.

  In the air conditioning system, the heat pump includes a compressor and a drive device that drives the compressor, and the operation state detection device detects a compressor rotation speed that is the rotation speed of the drive device as the detection value. Then, it may be a compressor rotation speed detection device that outputs to the control device.

  As a result, the compressor rotation speed is used as a detected value, and the start and stop of the boiler operation are controlled according to the detected value. Therefore, the operation state of the heat pump is accurately determined, and the boiler operation is started accordingly. Further, it is possible to control the stoppage, lower energy loss, and heat supply with high energy efficiency. In addition, the possibility of a shortage of heat supply is low.

  In the air conditioning system, the heat pump includes a compressor and an electric drive device that drives the compressor, and the operation state detection device detects an operation current of the drive device as the detection value, and It may be an operating current detection device that outputs to the control device.

  As a result, the operation current is detected and the start and stop of the boiler are controlled according to the detected value. Therefore, the operation state of the heat pump is accurately determined, and the start and stop of the boiler are accordingly performed. It is possible to control the heat, and it is possible to supply heat with lower energy loss and higher energy efficiency. In addition, the possibility of a shortage of heat supply is low. Further, since the operating current can be detected with a simple configuration, it can be easily realized.

  According to the present invention, it is possible to provide an air conditioning system that can supply heat with high energy efficiency and reduce energy loss.

It is a schematic block diagram of the air conditioning system which concerns on Embodiment 1 of this invention. It is a flowchart which shows the operation control of the boiler in the air conditioning system which concerns on Embodiment 1 of this invention. It is a schematic block diagram of the air conditioning system which concerns on Embodiment 2 of this invention. It is a flowchart which shows the operation control of the boiler in the air conditioning system which concerns on Embodiment 2 of this invention.

  The air conditioning system according to the present invention includes a heat pump and a boiler, and controls the boiler according to the operation state of the heat pump. More specifically, the boiler is operated when the load of the heat pump becomes equal to or higher than the predetermined first load, and the boiler is stopped when the load of the heat pump becomes equal to or lower than the second load smaller than the first load. To do. Thereby, heat can be supplied using a heat pump with high energy efficiency, and heat can be supplied together with a boiler before the capacity of the heat pump reaches its limit, so that the amount of heat supply is not insufficient. Further, since the operation of the boiler is controlled according to the operation state of the heat pump, the energy loss is also low.

Embodiments according to the present invention will be described below with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted.
(Embodiment 1)
The air conditioning system according to Embodiment 1 of the present invention will be described with reference to the drawings.

  First, the configuration of the air conditioning system according to the first embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of an air conditioning system according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the air conditioning system 1 </ b> A according to the first embodiment includes a heat pump 20 </ b> A, a boiler 30, a control device 40, and a compressor rotation speed detection device 50. The heat pump 20A and the boiler 30 are both used to adjust the temperature of the same air-conditioned space, and the boiler 30 is operated and stopped during the operation of the heat pump 20A. As the air-conditioned space, for example, the inside of a plastic house or the like can be mentioned. Moreover, it is not limited to this, 1 A of air conditioning systems can be used for air conditioning in various buildings, such as a building and a public facility.

  The driving form of the heat pump 20A is not particularly limited. For example, it may be driven using electricity, gas fuel, oil, or the like. However, for example, when the air conditioning system 1A is used in combination with a cogeneration apparatus (CHP), it is preferable to use an electric drive heat pump (EHP) that uses the generated power of the cogeneration apparatus as a power source.

  The heat pump 20A includes a compressor 21, a four-way valve 22, a heat exchanger (condenser) 23, an expansion valve 24, an evaporator 25, and a drive device 26A. In this Embodiment 1, the heat exchanger 23 which is a condenser is arrange | positioned in the air-conditioned space. In the first embodiment, since the heating operation cycle is executed by the heat pump 20A, the refrigerant flow direction is the compressor 21, the four-way valve 22, the heat exchanger (condenser) 23, the expansion valve 24, the evaporator 25, and the four-way. It becomes the valve 22 and the compressor 21.

  In the heat pump 20A, the drive device 26A is for operating the compressor 21, which is a compressor. The driving device 26A is, for example, an engine that is rotated by gas, oil, or the like, or an electric motor that is rotated by electricity. In the case where the driving device 26A is an electric motor, a power source for supplying power (not shown) and the driving device 26A are connected.

  In the heat pump 20 </ b> A, the refrigerant is compressed into gas by the operation of the compressor 21, and the compressed refrigerant is sent to the heat exchanger (condenser) 23. In the heat exchanger (condenser) 23, the refrigerant releases heat to become liquid, and is further expanded rapidly by being depressurized by the expansion valve 24 and sent to the evaporator 25. In the evaporator 25, the refrigerant absorbs heat and evaporates, and is sent to the compressor 21.

  The boiler 30 is disposed in the air-conditioned space. The fuel of the boiler 30 is not particularly limited, and there is no problem even if any fuel is burned.

  The compressor rotation speed detection device 50 is a sensor that detects the rotation speed of the compressor that is the rotation speed of the drive device 26A. The number of rotations refers to the number of rotations per unit time, for example, the unit is (rpm). As described above, the drive device 26A is rotationally driven, and the compressor 21 is operated by the power of the drive device 26A. The compressor rotational speed detection device 50 is a sensor that detects the rotational speed of the compressor in the rotational drive of the drive device 26A. Here, the compressor speed detected by the compressor speed detector 50 indicates the operating state of the heat pump 20A, and the operating load of the heat pump 20A can be detected by detecting the compressor speed. It can be said. The compressor rotation speed detection device 50 outputs the detected compressor rotation speed (detection value) to the control device 40 as a detection signal.

  The control device 40 controls the start and stop of the operation of the boiler 30, and determines the start and stop of the operation of the boiler 30 according to a detection signal from the compressor rotation speed detection device 50. That is, the control device 40 monitors the operation state of the heat pump 20A and controls the operation state of the boiler 30 according to the operation state. More specifically, in a state where the heat pump 20A is being operated, the boiler 30 is being operated when the compressor rotation speed detected by the compressor rotation speed detection device 50 is equal to or greater than the first rotation speed threshold value Na. If not, the control device 40 starts operation of the boiler 30. Further, in the state where the heat pump 20A is operated, the control is performed if the boiler 30 is operated when the compressor rotation speed detected by the compressor rotation speed detection device 50 becomes equal to or less than the second rotation speed threshold Nb. The device 40 stops the operation of the boiler 30.

  Here, the first rotation speed threshold value Na is a value larger than the second rotation speed threshold value Nb, and the first rotation speed threshold value Na may be a value slightly smaller than the maximum rotation speed of the driving device 26A. Thereby, in this Embodiment 1, when the heat pump 20A is supplying heat and the load of the heat pump 20A does not become too large, that is, when there is a margin up to the limit of the heat pump 20A, heat is supplied only by the heat pump 20A. I do. When the load of the heat pump 20A becomes too large, that is, when the limit of the heat pump 20A is close, the boiler 30 starts to operate and supplies heat in parallel. Thus, heat supply is usually performed with high energy efficiency by the heat pump 20A, and when the load of the heat pump 20A becomes too large, the boiler 30 is also used to supply heat, so that preferable heat supply depending on the situation In addition, energy loss can be reduced.

  Next, the operation of the boiler in the air conditioning system according to the first embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing operation control of the boiler in the air conditioning system according to Embodiment 1 of the present invention.

  When the air conditioning system 1A is activated, the operation of only the heat pump 20A is started, and the operation of the boiler 30 is not started. In this state, the compressor rotation speed detection device 50 detects the compressor rotation speed in the drive device 26A, and outputs a detection signal to the control device 40 as needed. Based on the detection signal from the compressor rotation speed detection device 50, the control device 40 determines whether or not the compressor rotation speed is greater than or equal to the first rotation speed threshold value Na (step S11). In the first embodiment, the first rotation speed threshold value Na is set to 90% of the maximum rotation speed of the driving device 26A. For example, if the maximum rotation speed of the drive device 26A is 6000 (rpm), the first rotation speed threshold value Na is 5400 (rpm). Note that the value of the first rotation speed threshold value Na is not limited to this value, and may be set as appropriate so that the air conditioning system 1A operates efficiently.

  When it is determined that the compressor rotational speed is equal to or higher than the first rotational speed threshold value Na (step S11: Yes), the control device 40 starts the operation of the boiler 30 (step S12).

  In a state where the operation of the boiler 30 is started in parallel with the heat pump 20A, the control device 40 determines whether or not the compressor rotational speed is equal to or less than the second rotational speed threshold Nb based on the detection signal from the compressor rotational speed detection device 50. Is determined (step S13). In the first embodiment, the second rotation speed threshold Nb is set to 80% of the maximum rotation speed of the driving device 26A. For example, if the maximum rotation speed of the driving device 26A is 6000 (rpm), the second rotation speed threshold Nb is 4800 (rpm). Note that the value of the second rotation speed threshold value Nb is not limited to this value, and may be set as appropriate so that the air conditioning system 1A operates efficiently.

  When it is determined that the compressor rotational speed is equal to or lower than the second rotational speed threshold Nb (step S13: Yes), the control device 40 stops the operation of the boiler 30 (step S14).

  As described above, according to the first embodiment, it is determined whether to start or stop the operation of the boiler 30 according to the value of the compressor rotation speed in the heat pump 20A in a state where the heat pump 20A is operating. That is, the operation of the boiler 30 is controlled according to the operation state of the heat pump 20A. Thereby, heat supply can be performed with high energy efficiency by the heat pump 20A, and the heat supply amount may be insufficient by accurately determining the operation state of the heat pump 20A and controlling the start and stop of the operation of the boiler 30. In addition, energy loss can be reduced.

(Embodiment 2)
An air conditioning system according to Embodiment 2 of the present invention will be described with reference to the drawings.

  First, the configuration of the air conditioning system according to the second embodiment will be described with reference to FIG. FIG. 3 is a schematic configuration diagram of an air conditioning system according to Embodiment 2 of the present invention.

  The heat pump 20B of the air conditioning system 1B according to the second embodiment illustrated in FIG. 3 has the same configuration as that included in the heat pump 20A of the air conditioning system 1A according to the first embodiment. As above-mentioned, the same code | symbol is attached | subjected about the same structure and description is abbreviate | omitted. Hereinafter, the air conditioning system 1B will be described focusing on a configuration different from the air conditioning system 1A.

  As shown in FIG. 3, the air conditioning system 1 </ b> B according to the second embodiment includes a heat pump 20 </ b> B, a boiler 30, a control device 40, an operating current detection device 60, and a power source 70. The heat pump 20B and the boiler 30 are both used to adjust the temperature of the same air-conditioned space, and the boiler 30 is operated and stopped during the operation of the heat pump 20B. As the air-conditioned space, for example, the inside of a plastic house or the like can be mentioned. Moreover, it is not limited to this, The air conditioning system 1B can be used for air conditioning in various buildings, such as a building and a public facility.

  Unlike the heat pump 20A of the air conditioning system 1A according to the first embodiment, the heat pump 20B of the air conditioning system 1B according to the second embodiment illustrated in FIG. 3 is limited to an electric heat pump that is driven by electricity. Therefore, unlike the driving device 26A, the driving device 26B uses an electric motor and does not use an engine. Note that power is supplied from the power source 70 to the driving device 26B. However, the drive device 26B is only limited to one that is driven by electricity, and is otherwise the same as the drive device 26A, and the operation is also the same as that of the drive device 26A.

  Also, in the air conditioning system 1B according to the second embodiment shown in FIG. 3, unlike the air conditioning system 1A, an operating current detection device 60 is provided instead of the compressor rotation speed detection device 50. The operating current detection device 60 is a sensor that detects an operating current supplied from the power source 70 to the driving device 26B. Here, the operating current detected by the operating current detection device 60 indicates the operating state of the heat pump 20B, and it can be said that the operating load of the heat pump 20B can be detected by detecting the operating current. The operating current detection device 60 outputs the detected operating current (detected value) to the control device 40 as a detection signal.

  The control device 40 controls the start and stop of the operation of the boiler 30, and determines the start and stop of the operation of the boiler 30 according to the detection signal from the operation current detection device 60. That is, the control device 40 monitors the operation state of the heat pump 20B and controls the operation state of the boiler 30 according to the operation state. More specifically, if the boiler 30 is not operated when the operating current detected by the operating current detection device 60 is equal to or higher than the first current threshold Ia in a state where the heat pump 20B is operated, the control device 40 starts operation of the boiler 30. In addition, if the boiler 30 is operated when the operating current detected by the operating current detection device 60 is equal to or lower than the second current threshold Ib in a state where the heat pump 20B is operated, the control device 40 causes the boiler 30 to operate. Stop driving.

  Here, the first current threshold value Ia is a value larger than the second current threshold value Ib, and the first current threshold value Ia may be a value slightly smaller than the maximum operating current of the driving device 26B. As a result, in the second embodiment, when the heat pump 20B is supplying heat and the load of the heat pump 20B does not become too large, that is, when there is room to the limit of the heat pump 20B, heat is supplied only by the heat pump 20B. I do. And when the load of the heat pump 20B becomes too large, that is, when the limit of the heat pump 20B is close, the boiler 30 starts to operate and supplies heat in parallel. In this way, heat supply is usually performed with high energy efficiency by the heat pump 20B, and when the load of the heat pump 20B becomes too large, the boiler 30 is also used to supply heat. In addition, energy loss can be reduced.

  Next, the operation of the boiler in the air conditioning system according to the second embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing operation control of the boiler in the air conditioning system according to Embodiment 2 of the present invention.

  When the air conditioning system 1B is activated, the operation of only the heat pump 20B is started, and the operation of the boiler 30 is not started. In this state, the operating current detection device 60 detects the operating current supplied to the drive device 26B, and outputs a detection signal to the control device 40 as needed. Based on the detection signal from the operating current detection device 60, the control device 40 determines whether or not the operating current is equal to or greater than the first current threshold Ia (step S21). In the second embodiment, the first current threshold value Ia is 90% of the maximum current of the operating current supplied to the driving device 26B. For example, if the maximum operating current supplied to the driving device 26B is 15 (A), the first current threshold Ia is 13.5 (A). Note that the value of the first current threshold value Ia is not limited to this value, and may be set as appropriate so that the air conditioning system 1B operates efficiently.

  When it is determined that the operating current is equal to or greater than the first current threshold Ia (step S21: Yes), the control device 40 starts the operation of the boiler 30 (step S22).

  In a state where the operation of the boiler 30 is started in parallel with the heat pump 20B, the control device 40 determines whether or not the operating current is equal to or less than the second current threshold Ib based on the detection signal from the operating current detection device 60 ( Step S23). In the second embodiment, the second current threshold Ib is set to 80% of the maximum operating current supplied to the driving device 26B. For example, if the maximum current of the operating current supplied to the driving device 26B is 15 (A), the second current threshold Ib is 12 (A). Note that the value of the second current threshold Ib is not limited to this value, and may be set as appropriate so that the air conditioning system 1B operates efficiently.

  When it is determined that the operating current is equal to or less than the second current threshold Ib (step S23: Yes), the control device 40 stops the operation of the boiler 30 (step S24).

  As described above, according to the second embodiment, it is determined whether the operation of the boiler 30 is started or stopped according to the value of the operation current in the heat pump 20B in a state where the heat pump 20B is operated. That is, the operation of the boiler 30 is controlled according to the operation state of the heat pump 20B. Thereby, heat supply can be performed with high energy efficiency by the heat pump 20B, and the heat supply amount may be insufficient by accurately determining the operation state of the heat pump 20B and controlling the start and stop of the operation of the boiler 30. In addition, energy loss can be reduced. Further, since the operating current can be detected with a simple configuration, it can be easily realized.

  The air conditioning system 1A according to the first embodiment and the air conditioning system 1B according to the second embodiment have been described above, but the present invention is not limited to these embodiments. For example, the operating state of the heat pump may be detected based on values other than the compressor speed and operating current, such as the operating voltage of the driving device. In the first and second embodiments, the operation start and stop of the boiler 30 are controlled based on the two threshold values, but the operation start and stop control of the boiler 30 may be controlled based on a larger number of threshold values. . Moreover, you may control the operation start and stop of the boiler 30 based on one threshold value.

  According to the present invention, since the heat pump is operated and the start and stop of the operation of the boiler are controlled according to the operation state of the heat pump, heat supply can be performed with high energy efficiency, and the heat supply amount is insufficient. Is less likely to occur, and energy loss can be reduced.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-mentioned embodiment is only a mere illustration in all points, and should not be interpreted limitedly. The scope of the present invention is set forth in the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

1A, 1B Air conditioning system 20A, 20B Heat pump 21 Compressor 22 Four-way valve 23 Heat exchanger (condenser)
24 Expansion valve 25 Evaporator 26A, 26B Drive device 30 Boiler 40 Control device 50 Compressor rotation speed detection device 60 Operating current detection device 70 Power supply

Claims (4)

An air conditioning system comprising a heat pump and a boiler,
An operation state detection device for detecting the operation state of the heat pump;
A control device that controls the start and stop of the operation of the boiler according to the operation state detected by the operation state detection device,
An air conditioning system characterized by that. The air conditioning system according to claim 1,
The controller is
When the boiler is in a stopped state, if the detected value of the operating state detected by the operating state detection device is equal to or greater than a first threshold value, the operation of the boiler is started.
When the boiler is in an operating state, the boiler is stopped when the detected value is equal to or lower than a second threshold value.
An air conditioning system characterized by that. The air conditioning system according to claim 2,
The heat pump has a compressor and a driving device for driving the compressor,
The operating state detection device is a compressor rotation speed detection device that detects the rotation speed of the compressor that is the rotation speed of the drive device as the detection value and outputs the detection value to the control device.
An air conditioning system characterized by that. The air conditioning system according to claim 2,
The heat pump has a compressor and an electric drive device that drives the compressor,
The operation state detection device is an operation current detection device that detects an operation current of the drive device as the detection value and outputs the detection value to the control device.
An air conditioning system characterized by that.

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