JP2014047931A - Temperature set value control device and temperature set value control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature set value control device and a temperature set value control method capable of achieving energy saving at a low cost.SOLUTION: A temperature difference acquisition section 123 acquires a temperature difference between a supply water temperature and a supply air temperature on the basis of a target cold water flow rate set by a user and a relation of a cold water flow rate to the temperature difference between the supply water temperature and the supply air temperature. A temperature setting section 124 sets a target value of the supply water temperature by adding the temperature difference to the supply air temperature. Thus, because the target value of the supply water temperature can be set by a simple calculation without requiring a high performance calculation device, a temperature control device can be realized at a low cost. Energy saving can also be achieved because a flow rate of a heat medium is not extremely increased.

Description

  The present invention relates to a temperature set value control device and a temperature set value control method for a heat source in an air conditioning system.

  Conventionally, in an air conditioning control system using cold / hot water as a heat medium, cold / hot water is generated by a heat source device, and the cold / warm water generated by the heat source device is sent to a load device via a pump.

  In such an air conditioning control system, the amount of energy used by the refrigerator and the heat source device changes depending on the setting of the temperature of the cold / hot water supplied from the heat source device to the load device. For example, when the heat source device is a refrigerator, if the water supply temperature is set low, the amount of energy used by the pump decreases as the amount of energy used by the refrigerator increases. If the water supply temperature is set higher, the amount of energy used by the pump increases as the amount of energy used by the refrigerator decreases. That is, the energy consumption of the refrigerator and the pump is a trade-off. The same can be said when the heat source device is a heat machine.

  Therefore, it has been proposed to save energy by calculating the sum of the amount of energy used by the heat source device and the amount of energy used by the pump, and setting the water supply temperature so that this value is minimized (for example, Patent Document 1). , 2).

  For example, in Patent Document 1, the values of various parameters related to the current load situation such as the water supply temperature, the return water temperature, and the flow rate of cold / hot water are collected, and the collected parameter values are converted into a predetermined function model. By substituting, the current total energy consumption of the heat source device and the pump is calculated, and the total energy consumption of the heat source device and the pump is minimized by gradually changing the water supply temperature in the function model used for this calculation. And the water supply temperature is determined as the current optimum water supply temperature. In Cited Document 2, the actual values of related parameters such as the amount of energy used by the heat source device, the amount of energy used by the pump, the temperature of the cold / hot water supplied from the heat source device, and the outside air temperature are plotted in a three-dimensional space or a four-dimensional space. A response surface model is created by RSM-S (Response Surface Method by Spline) technology, and the current optimum water supply temperature is determined by this response surface model.

JP 2003-262384 A JP 2010-236786 A

  However, since all of the above methods require complicated computations, a high-performance computing device must be used, and since such a computing device is generally expensive, the temperature setting provided with the computing device. It has been difficult to reduce the cost of the value control device. For this reason, a temperature setpoint control device that can realize energy saving at low cost has been desired.

  Accordingly, an object of the present invention is to provide a temperature set value control device and a temperature set value control method that can realize energy saving at low cost.

  In order to solve the above-described problems, a temperature setting value control device according to the present invention includes a heat source device that adds heat to a heat medium, a heat medium supplied from the heat source device, and ambient air. In an air conditioning system including a load device that performs heat exchange and supplies the heat-exchanged air as supply air, and a pump that applies pressure to a heat medium that circulates between the heat source device and the load device. The temperature setting value control device for the heat medium supplied from the temperature acquisition unit that acquires the temperature of the supply air, the flow rate acquisition unit that acquires the flow rate target value of the heat medium, and the flow rate acquired by the flow rate acquisition unit Obtains the temperature difference between the temperature of the heat medium and the temperature of the supply air based on the target value, the temperature difference between the temperature of the heat medium supplied from the heat source unit and the temperature of the supply air, and the flow rate of the heat medium The temperature difference acquisition unit that performs and the temperature of the supply air acquired by the temperature acquisition unit It is characterized in further comprising a temperature setter for setting a target value of the temperature of the heat medium by adding the temperature difference acquired by the temperature difference obtaining unit.

  In the temperature setting value control apparatus, a plurality of load devices may be provided, and the temperature setting unit may set the temperature of the heat medium based on the temperature of the supply air in the plurality of load devices. Here, as the supply air temperature, an average value of a plurality of load devices, a minimum value of the plurality of load devices, or the like may be used.

  Also, the temperature setpoint control method according to the present invention performs heat exchange between a heat source device that adds heat to the heat medium, the heat medium supplied from the heat source device, and the surrounding air, and this heat exchange is performed. Temperature setting of a heat medium supplied from a heat source device in an air conditioning system including a load device that supplies fresh air as supply air and a pump that applies pressure to the heat medium circulating between the heat source device and the load device The value control method is a temperature acquisition step for acquiring the temperature of the supply air, a flow rate acquisition step for acquiring a flow rate target value of the heat medium, a flow rate target value acquired by the flow rate acquisition step, and a heat source device. A temperature difference acquisition step for acquiring a temperature difference between the temperature of the heating medium and the temperature of the supply air based on the relationship between the temperature difference between the temperature of the heating medium and the supply air and the flow rate of the heating medium; To the temperature of the air supply obtained by the step It is characterized in that it has a temperature setting step of setting a target value of the temperature of the heat medium by adding the temperature difference set by the temperature difference obtaining step.

  According to the present invention, based on the target flow rate of the heat medium, the temperature difference between the temperature of the heat medium supplied from the heat source unit and the temperature of the supply air, and the relationship between the flow rate of the heat medium, By setting the target value, the target value of the temperature of the heat medium can be set with a simple calculation, so a high-performance arithmetic device is not required for the calculation, and the temperature setting value control device can be reduced in cost. be able to. Moreover, since the flow rate of the heat medium does not increase extremely, energy saving can be realized.

FIG. 1 is a diagram schematically showing a configuration of an air conditioning system according to the present invention. FIG. 2 is a block diagram illustrating a configuration of the temperature set value control apparatus. FIG. 3 is a diagram showing the relationship between the temperature difference and the flow rate. FIG. 4 is a flowchart for explaining the operation of the temperature set value control apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Configuration of air conditioning system]
As shown in FIG. 1, the air conditioning system according to the present embodiment generates at least one of cold water and hot water (hereinafter referred to as “cold / warm water”) such as a cold / hot water generator, a heat pump, a refrigerator, and a boiler. Heat source units 1-1 and 1-2, pumps 2-1 and 2-2 interlocking with driving of corresponding heat source units 1-1 and 1-2, forward header 3, water supply conduit 4, and fan coil Water supply for measuring the temperature of the water supply from the load device 5, the return water pipe 6, the return path header 7, and the heat source units 1-1 and 1-2, which are composed of units, air conditioners, etc. Thermometers 8-1, 8-2, an outward path thermometer 9 for measuring the temperature of water supplied from the forward path header 3, and the temperature of the supply air supplied from the load device 5 (hereinafter referred to as “supply air temperature”). ), A flow meter 11 for measuring the flow rate of the circulating water, and a water supply temperature. And a temperature setting value control unit 12.

  In such an air conditioning system, the water pumped by the pumps 2-1 and 2-2 is supplied to the heat source devices 1-1 and 1-2, and heat is added by the heat source devices 1-1 and 1-2. It becomes cold and hot water (water supply). The cold / hot water is supplied to the water supply line 4 via the forward header 3 and sent to the load device 5. In the load device 5, heat exchange is performed between the ambient air and the water supply, and the ambient air subjected to the heat exchange is supplied to the outside of the load device 5 as supply air. Thereby, the air conditioning of the to-be-controlled space where the load apparatus 5 is arrange | positioned is achieved. The cold / hot water subjected to heat exchange by the load device 5 reaches the header 7 as return water through the return water pipe 6, is again pumped by the pumps 2-1, 2-2, and circulates through the above paths.

  Here, as shown in FIG. 2, the temperature setting value control device 12 includes a temperature acquisition unit 121, a flow rate acquisition unit 122, a temperature difference acquisition unit 123, and a water supply temperature setting unit 124.

  The temperature acquisition unit 121 acquires each measurement value measured by the supply air thermometer 10. From the supply air thermometer 10, the supply air temperature is acquired.

  The flow rate acquisition unit 122 acquires a target value of the flow rate of cold water based on an arbitrary operation input by the user.

  The temperature difference acquisition unit 123 is referred to as a supply air temperature and a water supply temperature to which heat is added by the heat source devices 1-1 and 1-2 (hereinafter referred to as “water supply temperature”) based on an arbitrary operation input by the user. ) (Hereinafter referred to as “temperature difference”) and the flow rate of the cold water is acquired and stored in advance. The reason for storing such a temperature difference will be described with reference to FIG. FIG. 3 is a graph showing the relationship between the temperature difference between the supply air temperature and the water supply temperature and the flow rate of cold water in a general air conditioning system in which the heat source device is a refrigerator. In FIG. 3, the vertical axis indicates the flow rate of cold water, and the horizontal axis indicates the difference between the supply air temperature and the water supply temperature.

The higher the water supply temperature, the higher the efficiency of the heat source unit, and the lower the energy consumption of the heat source unit. However, it is conceivable that the higher the water supply temperature, the closer to the temperature of the supply air of the load device, the load flow rate increases, and the conveyance power of the pump increases. As shown in FIG. 3, if the temperature difference between the supply air temperature and the water supply temperature is small, a large amount of cold water is required to realize the heat exchange required by the load device, and the conveyance power of the pump increases. If the temperature difference between the supply air temperature and the water supply temperature is large, only a small amount of cold water is required to realize the heat exchange required by the load equipment.
As described above, the energy consumption of the heat source device decreases if the water supply temperature is high, but may increase the conveyance power of the pump if it is too high. By monitoring the correlation between the temperature difference between the supply air temperature and the water supply temperature and the load flow rate, it is possible to determine the temperature difference at which the pump transfer power becomes excessively large. The temperature difference from the water supply temperature can be obtained, and the water supply temperature of the heat source machine can be raised to the limit.

  Therefore, in the present embodiment, the relationship between the temperature difference between the supply air temperature and the water supply temperature and the flow rate of the cold water in the applied air conditioning system, such as the graph shown in FIG. A temperature difference between the supply air temperature and the water supply temperature is set based on this relationship and the target value of the flow rate of the cold water. As a result, the flow rate of the cold water does not increase excessively, so that it is possible to prevent the energy consumption of the heat source devices 1-1 and 1-2 and the pumps 2-1 and 2-2 from increasing, resulting in energy saving. Can be realized.

  The water supply temperature setting unit 124 sets the target value of the water supply temperature (the upper limit value in the case of cold water) based on the supply air temperature acquired by the temperature acquisition unit 121 and the temperature difference acquired by the temperature difference acquisition unit 123. Set. Specifically, a value obtained by adding a temperature difference to the supply air temperature is set as the target value of the water supply temperature. This target value is transmitted to the heat source devices 1-1 and 1-2. The heat source devices 1-1 and 1-2 generate cold / hot water so that the water supply temperature becomes the received target value.

  Such a temperature set value control device 12 inputs information from the outside such as a calculation device such as a CPU, a storage device such as a memory and an HDD (Hard Disc Drive), and a keyboard, a mouse, a pointing device, a button, a touch panel and the like. An input device for detection, an I / F device that transmits and receives various information via a communication line such as the Internet, a LAN (Local Area Network), and a WAN (Wide Area Network), and a display device such as an LCD (Liquid Crystal Display) And a program installed on the computer. That is, the hardware device and software cooperate to control the above hardware resources by a program, and the above-described temperature acquisition unit 121, flow rate acquisition unit 122, temperature difference acquisition unit 123, and water supply temperature setting unit 124 are realized. Is done. Note that the program may be provided in a state of being recorded on a recording medium such as a CD-ROM, a DVD-ROM, or a memory card.

[Water temperature control method]
Next, with reference to FIG. 4, the control method of the water supply temperature by the temperature setting value control apparatus 12 is demonstrated. In the following, a case of cooling, that is, a case where cold water is supplied from the heat source devices 1-1 and 1-2 will be described as an example.

  First, the temperature difference acquisition unit 123 acquires a temperature difference between the supply air temperature and the water supply temperature based on an operation input by the user (step S1). For this temperature difference, a predetermined value such as 10 [° C.] is set.

  When acquiring the temperature difference, the temperature acquisition unit 121 acquires the supply air temperature from the supply air thermometer 10 (step S2). The acquired supply air temperature is sent to the water supply temperature setting unit 124.

  When the supply air temperature is acquired, the water supply temperature setting unit 124 sets a value obtained by adding the temperature difference set by the temperature difference acquisition unit 123 to the supply air temperature as a target value of the water supply temperature (step S3). Thus, in the present embodiment, the target value of the water supply temperature is set by a simple calculation of adding a temperature difference to the supply air temperature. Therefore, cost reduction can be realized.

  As described above, according to the present embodiment, by setting the target value of the water supply temperature based on the relationship between the water supply temperature, the supply air temperature, the temperature difference, and the flow rate of the cold water, a simple calculation can be performed. Since the target value of the water supply temperature can be set, a high-performance arithmetic device is not required for the calculation, so that the cost of the temperature set value control device can be reduced. Moreover, since the flow rate of the heat medium does not increase extremely, energy saving can be realized.

  In the present embodiment, the case where only one load device 5 is provided has been described as an example, but a plurality of load devices 5 may be provided. In this case, an average value of the supply air temperatures of the load devices 5 may be used as the supply air temperature. Further, the minimum value among the supply air temperatures of the load devices 5 may be used. Moreover, you may make it use the 2nd value from the lower one among the supply air temperature of each load apparatus 5. FIG.

  Further, the relationship between the temperature difference between the temperature of the heat medium supplied from the heat source device, the supply air temperature, and the flow rate of the heat medium may be changed as appropriate based on the calorific value.

  In addition, the water supply temperature may be provided with an upper limit value or a lower limit value according to the control state of the load device 5. For example, in the case of cooling, an upper limit value can be provided. Thereby, the situation where the water supply temperature is too high and air conditioning as cooling cannot be performed can be prevented.

  Moreover, in this Embodiment, although the heat-source equipment control part 125 demonstrated to the example the case where the water supply temperature measured by the outward path thermometer 9 and a supply air temperature were compared, heat-source equipment 1-1, 1-2. You may make it compare the water supply temperature by the water supply thermometers 8-1 and 8-2 which measure the temperature of the water supply from, and a supply air temperature. In this case, you may make it compare the water supply temperature of each of the water supply thermometers 8-1 and 8-2, and the supply air temperature. Thereby, suitable water supply temperature is realizable for every heat-source equipment 1-1 and 1-2. Moreover, you may make it compare the average value of the water supply temperature by the water supply thermometers 8-1 and 8-2, and supply air temperature. Thereby, the water supply temperature as the heat-source equipment 1-1 and 1-2 whole can be made into an appropriate value.

  Moreover, although this Embodiment demonstrated to the example the case where it applied to the air-conditioning system provided with the primary side pumps 2-1 and 2-2 which pressurize the circulating water from a load apparatus, Furthermore, a heat source machine and a load apparatus Needless to say, the present invention can also be applied to an air conditioning system including a secondary pump that pressurizes water supplied from a heat source machine. In this case, the secondary pump is driven in conjunction with the drive of the heat source machine. At this time, the primary pump may be driven in conjunction with the driving of the heat source device. Even in this way, energy saving can be realized.

  The present invention can be applied to an air conditioning system having a pump.

  1-1, 1-2 ... Heat source machine, 2-1, 2-2 ... Pump, 3 ... Outward header, 4 ... Water supply pipeline, 5 ... Load equipment, 6 ... Circulation pipeline, 7 ... Circulation header, 8 -1,8-2 ... Water supply thermometer, 9 ... Outward thermometer, 10 ... Supply thermometer, 11 ... Flow meter, 12 ... Temperature set value control device, 121 ... Temperature acquisition unit, 122 ... Flow rate acquisition unit, 123 ... temperature difference acquisition part, 124 ... water supply temperature setting part.

Claims (3)

A heat source device that adds heat to the heat medium, and a load device that performs heat exchange between the heat medium supplied from the heat source device and ambient air, and supplies the heat-exchanged air as supply air, In an air conditioning system comprising a pump that applies pressure to the heat medium circulating between the heat source device and the load device, the temperature control device for the heat medium supplied from the heat source device,
A temperature acquisition unit for acquiring the temperature of the supply air;
A flow rate acquisition unit for acquiring a flow rate target value of the heat medium;
Based on the flow rate target value acquired by the flow rate acquisition unit, the temperature difference between the temperature of the heat medium supplied from the heat source unit and the temperature of the supply air, and the relationship between the flow rate of the heat medium, A temperature difference acquisition unit for acquiring a temperature difference between the temperature of the medium and the temperature of the supply air;
A temperature setting unit that sets a target value of the temperature of the heat medium by adding the temperature difference acquired by the temperature difference acquisition unit to the temperature of the supply air acquired by the temperature acquisition unit. A temperature setpoint control device characterized by the above. The temperature control device according to claim 1,
A plurality of the load devices are provided,
The temperature setting unit sets the temperature of the heat medium based on the temperature of the supply air in the plurality of load devices. A heat source device that adds heat to the heat medium, and a load device that performs heat exchange between the heat medium supplied from the heat source device and ambient air, and supplies the heat-exchanged air as supply air, In an air conditioning system including a pump that applies pressure to the heat medium that circulates between the heat source device and the load device, the temperature control method for the heat medium supplied from the heat source device,
A temperature acquisition step of acquiring a temperature of the supply air;
A flow rate acquisition step of acquiring a flow rate target value of the heat medium;
Based on the flow rate target value acquired in the flow rate acquisition step, the temperature difference between the temperature of the heat medium supplied from the heat source unit and the temperature of the supply air, and the relationship between the flow rate of the heat medium. A temperature difference obtaining step for obtaining a temperature difference between the temperature of the medium and the temperature of the supply air; and
A temperature setting step of setting a target value of the temperature of the heat medium by adding the temperature difference set by the temperature difference acquisition step to the temperature of the supply air acquired by the temperature acquisition step. A temperature setpoint control method characterized by the above.

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