JP2016044831A - Heat medium circulation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat medium circulation system which can be applied to an air conditioner and the like requiring high reliability and the power consumption of which can be reduced.SOLUTION: A target cold water temperature Two is determined within the range of an upper limit cold water temperature Th or less, and the upper limit cold water temperature Th is determined on the basis of a temperature of the air (diffused air) cooled by an indoor heat exchanger. For this reason, the cooling system is operated in such a manner that the cold water has the upper limit cold water temperature Th or a temperature near the upper limit cold water temperature Th, and as a result, power consumption can be reduced while keeping necessary cooling capacity.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a heat medium circulation system that moves heat generated by a heat source device using a heat medium.

  For example, in the heat medium circulation system described in Patent Document 1, cold heat is generated by a heat source device, and cold water cooled by the cold heat is circulated to an air conditioner, thereby moving the cold heat to a cooling target. .

  And in invention of patent document 1, it is cold water so that the difference of the temperature of the cold water sent out toward an air conditioner and the temperature of the cold water which returns from an air conditioner may be less than the preset temperature difference. The amount of circulation (operation of the cold water secondary pump) is controlled.

Japanese Patent No. 4333818

  An object of the present invention is to provide a heat medium circulation system capable of reducing power consumption in a heat medium circulation system applicable to an air conditioner or the like that requires high reliability.

  In order to achieve the above object, the present invention generates a cold heat and heats a heat source device (7) that cools a heat medium (hereinafter referred to as “cold water”) with the cold heat, and the cold water and a heat exchange target. The heat exchanger (5A) that exchanges and cools the heat exchange target, and a chilled water temperature determination unit that determines a target temperature (hereinafter referred to as “target chilled water temperature (Two)”) within a range equal to or lower than the upper limit temperature (Th). (S15 to S19) and the cold water temperature adjusting device (7A, 10D) for setting the temperature of the cold water to the target cold water temperature (Two), and the temperature of the heat exchange target cooled by the heat exchanger (5A) An upper limit temperature determining unit (S9) for determining an upper limit temperature (Th).

  In the present invention, the cold water temperature adjusting device (7A, 10D) operates so that the temperature of the cold water becomes the target cold water temperature (Two). At this time, the higher the target cold water temperature (Two), the lower the power consumption of the heat medium circulation system.

  And in this invention, target cold water temperature (Two) is determined within the range below upper limit temperature (Th), and the said upper limit temperature (Th) is the heat exchange object cooled with the heat exchanger (5A). It is determined based on the temperature.

  For this reason, the chilled water temperature adjusting device (7A, 10D) operates so that the temperature of the chilled water is close to the upper limit temperature (Th) or the upper limit temperature (Th). It is possible to obtain a heat medium circulation system that can be reduced.

  Incidentally, the reference numerals in parentheses for each of the above means are examples showing the correspondence with the specific means described in the embodiments described later, and the present invention is indicated by the reference numerals in the parentheses of the above respective means. It is not limited to specific means.

It is a figure showing an outline of an air-conditioning system concerning an embodiment of the present invention. It is a figure which shows the outline | summary of the control system of the air conditioning system which concerns on embodiment of this invention. It is explanatory drawing of the cooling tower 7B which concerns on embodiment of this invention. It is a flowchart which shows the control which concerns on 1st Embodiment of this invention. It is power consumption plots in 3rd Embodiment of this invention. It is a flowchart which shows the characteristic of 3rd Embodiment of this invention.

  The “embodiment of the invention” described below shows an example of the embodiment. In other words, the invention specific items described in the claims are not limited to the specific means and structures shown in the following embodiments.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that at least one member or part described with at least a reference numeral is provided, except for cases where “plural”, “two or more” and the like are omitted.

(First embodiment)
1. 1. Configuration of air conditioning system 1.1 Outline of air conditioning system In the present embodiment, the heat medium circulation system according to the present invention is applied to an air conditioning system that performs air conditioning in a server room, a communication equipment room, and the like. That is, the air conditioning system according to the present embodiment cools a plurality of ICT devices and the like by supplying cooling air to heat-generating devices such as information communication technology devices (hereinafter referred to as ICT devices).

  As shown in FIG. 1, the plurality of ICT devices 1 are installed in a data center room or the like in a state assembled to the rack 3. The rack 3 is configured by a frame-shaped storage shelf in which a metal shelf frame and a column wall are combined.

  One side of the rack 3 is provided with a cold air passage (cold aisle) 3A to which cold air is supplied. The cool air is supplied from the duct space 3C provided under the floor of the cool air passage 3A to the rack 3 side, and then supplied to the cool air passage 3A from a plurality of cold air outlets (not shown) provided on the floor.

  A cold air outlet is not provided in the passage 3B opposite to the cold air passage 3A across the rack 3. In the passage 3B, air supplied from the cold air passage 3A to the ICT device 1 and having undergone heat exchange with the ICT device 1 flows. That is, the passage 3B is a hot air passage (hot aisle) through which heated air (hot air) flows.

  The air conditioning unit 5 generates cooling air supplied to the ICT equipment 1 side. In a server room or the like in which a plurality of ICT devices 1 are installed, at least one (two in FIG. 1) air conditioning unit 5 is installed.

  As shown in FIG. 2, each air conditioning unit 5 is configured by an air handling unit (AHU) having an indoor heat exchanger 5A, a flow rate adjusting valve 5B, an indoor blower 5C, and the like. The indoor heat exchanger 5A exchanges heat between the cold water supplied from the heat source device 7 and the air that forms the heat exchange target.

  The heat source device 7 generates cold heat. The cold heat is supplied to the indoor heat exchanger 5A by cold water as a heat medium. The heat medium, that is, cold water is supplied to the indoor heat exchanger 5A (the air conditioning unit 5) by the primary pump P1 and the secondary pump P2.

  The flow rate adjusting valve 5B is provided in each indoor heat exchanger 5A. The flow rate adjusting valve 5B adjusts the amount of chilled water supplied to the indoor heat exchanger 5A. The indoor blower 5C is a blower capable of supplying cold air to the ICT device 1 side and adjusting the air volume.

  The heat source device 7 is installed outdoors. The cold water generated by the heat source device 7 is supplied to the indoor (air conditioning unit 5) side by the primary pump P1, and then distributed and supplied to each air conditioning unit 5 by the secondary pump P2.

  The bypass flow path L1 is a chilled water circuit that absorbs a flow rate difference when the discharge flow rate of the primary pump P1 and the discharge flow rate of the secondary pump P2 are different. For example, when the opening degree of the flow rate adjustment valve 5B becomes small and the discharge flow rate of the secondary pump P2 decreases, the reduced amount flows through the bypass flow path L1.

  The heat source device 7 includes a heat source machine 7A, a cooling tower 7B, a cooling water pump P3, and the like. The heat source unit 7A is configured by a vapor compression refrigerator that circulates a refrigerant such as chlorofluorocarbon to move the heat on the low temperature side to the high temperature side.

  The cooling tower 7B cools the cooling water by exchanging heat between the cooling water heat-exchanged with the refrigerant and at least one of air and water. The cooling tower 7B according to the present embodiment is a hermetic cooling tower as shown in FIG. The cooling tower 7B is provided with an outdoor fan 7C, a sprinkler 7D, an outdoor heat exchanger 7E, and the like.

  The outdoor heat exchanger 7E mainly exchanges heat between the atmosphere and the cooling water. The outdoor blower 7C is a blower that can blow air to the outdoor heat exchanger 7E and adjust the amount of blown air. For this reason, if the rotation speed of the outdoor blower 7C is increased or decreased to increase or decrease the amount of air flow, the heat exchange capacity between the cooling water and the atmosphere can be increased or decreased.

  The water sprinkler 7D sprinkles water to the outdoor heat exchanger 7E. When water is sprinkled on the outdoor heat exchanger 7E, the sprinkled water absorbs heat from the outdoor heat exchanger 7E and evaporates or rises in temperature. Thereby, a cooling water is cooled largely compared with the case where watering is not carried out. That is, by controlling the operation of the sprinkler 7D, the heat exchange capacity between the cooling water and the atmosphere can be adjusted.

1.2 Air Conditioning System Capacity Adjustment Device The heat exchange capacity generated in the indoor heat exchanger 5A, that is, the cooling capacity generated in the indoor heat exchanger 5A is determined by the opening degree of the flow rate adjustment valve 5B, the air flow rate of the indoor fan 5C, It varies depending on the amount of cold water supplied to the heat exchanger 5A (the amount of water delivered by the secondary pump P2) and the temperature of the cold water (the refrigeration capacity generated by the heat source device 7).

  The refrigerating capacity generated in the heat source device 7, that is, the refrigerating capacity generated in the heat source unit 7A (vapor compression type refrigerating machine) is added to the cooling capacity of the cooling tower 7B, the circulating water amount of the cooling water, etc. It varies depending on the rotational speed of the provided compressor and the opening degree of the expansion valve. The cooling capacity of the cooling tower 7B varies depending on the amount of air blown by the outdoor blower 7C and the amount of water sprayed by the water sprinkler 7D.

  That is, the flow rate adjusting valve 5B, the indoor blower 5C, the secondary pump P2, the cooling water pump P3, the outdoor blower 7C, the sprinkler 7D, and the like function as a capacity adjusting device that adjusts the heat exchange capacity generated in the indoor heat exchanger 5A. To do. Hereinafter, when the flow rate adjusting valve 5B, the indoor blower 5C, and the like are collectively referred to as a capacity adjusting device.

  In particular, the opening degree of the flow rate adjusting valve 5B, the amount of air blown from the indoor fan 5C, and the amount of water fed from the secondary pump P2 are the temperature of the air cooled by the indoor heat exchanger 5A, that is, the heat exchange generated in the indoor heat exchanger 5A. Since it directly affects the capacity, the flow rate adjusting valve 5B, the indoor blower 5C, and the secondary pump P2 are collectively referred to as a blown air temperature adjusting device.

  As shown in FIG. 2, the operation of the capacity adjusting device is controlled by the integrated control device 10. The integrated control device 10 is a capacity adjustment device via an air conditioner control unit 10A, a secondary pump control unit 10B, a primary pump control unit 10C, a heat source control unit 10D, a cooling water pump control unit 10E, and a cooling tower control unit 10F. Indirect control of each device constituting the.

  The air conditioner control unit 10A controls the operation of the air conditioning unit 5, that is, the flow rate adjusting valve 5B, the indoor blower 5C, and the like. The secondary pump control unit 10B controls the amount of cold water supplied to the air conditioning unit 5 by controlling the operation of the secondary pump P2.

  The primary pump control unit 10C controls the operation of the primary pump P1. The heat source control unit 10D controls the heat source unit 7A, that is, the rotational speed of the compressor, the opening degree of the expansion valve, and the like. The cooling water pump control unit 10E controls the operation of the cooling water pump P3 to control the circulation amount of the cooling water. The cooling tower control unit 10F controls the amount of air blown by the outdoor fan 7C, the amount of water sprayed by the water sprinkler 7D, and the like.

  The integrated control device 10 and the control units 10A to 10F are configured by including a computer having a CPU, a ROM, a RAM, and the like. A program for executing the control is stored in advance in a nonvolatile storage unit such as a ROM provided in the integrated control device 10 and the control units 10A to 10F.

2. 2.1 Control action by integrated control device 2.1 Outline of control action <Autonomous control of each control unit>
Each of the control units 10A to 10F includes a drive circuit that drives a control target of the control unit, and directly controls the control target. The integrated control device 10 issues a control command signal to each of the control units 10A to 10F.

  That is, after receiving the control command signal from the integrated control device 10, each of the control units 10A to 10F autonomously executes specific control for realizing the content of the control command signal. The integrated control device 10 and the control units 10A to 10F can execute at least a normal control mode and a power saving control mode as control modes.

  For example, each air conditioning unit 5 is provided with a blown air temperature sensor S1. The blown air temperature sensor S1 detects the temperature of the air supplied indoors from the air conditioning unit 5, that is, the temperature of the air for which heat exchange has been completed in the indoor heat exchanger 5A (hereinafter referred to as temperature after heat exchange).

  In the normal control mode, the air conditioner control unit 10A is configured so that the post-heat exchange temperature detected by the blown air temperature sensor S1 (hereinafter referred to as blown air temperature) The flow rate adjusting valve 5B and the indoor blower 5C are controlled so that the temperature after heat exchange (hereinafter referred to as the target blowing temperature Tao) is achieved.

  That is, the air conditioner control unit 10A autonomously controls the operation of the air conditioning unit 5 so as to be the current target blowing temperature Tao unless the new target blowing temperature Tao is set by the integrated control device 10.

  For this reason, in the normal control mode, the air conditioner control unit 10A increases the flow rate of the chilled water supplied to the indoor heat exchanger 5A by increasing the opening degree of the flow rate adjustment valve 5B as the target blowing temperature Tao decreases. And the opening degree of the flow control valve 5B is made small and the cold water flow rate supplied to the indoor heat exchanger 5A is made small, so that the target blowing temperature Tao becomes high.

  Note that the air conditioner control unit 10A according to the present embodiment does not uniquely determine the opening degree of the flow rate adjustment valve 5B with respect to the target blowing temperature Tao. That is, the air conditioner control unit 10A monitors the current blown air temperature (the detected temperature of the blown air temperature sensor S1), and adjusts the flow rate adjustment valve 5B so that the current blown air temperature and the target blown temperature Tao are reduced. Change the opening sequentially.

  The integrated control device 10 is based on the temperature difference between the target indoor air temperature (hereinafter referred to as the indoor set target temperature Trs) and the indoor air temperature detected by the room temperature sensor S5 (hereinafter referred to as the room temperature Tr). The target blowing temperature Tao is determined.

  Specifically, when the room temperature Tr is lower than the indoor set target temperature Trs, the integrated control device 10 sets a temperature higher than the current target blowing temperature Tao as a new target blowing temperature Tao. When the room temperature Tr is equal to or higher than the indoor set target temperature Trs, the integrated control apparatus 10 sets a temperature lower than the current target blowing temperature Tao as a new target blowing temperature Tao.

  The air conditioner control unit 10A, when it is necessary to rapidly reduce the temperature in the server room (room temperature), that is, as the value obtained by subtracting the target blowing temperature Tao from the current blowing air temperature increases, Increase air flow.

  In addition, if the amount of blown air increases while the temperature and flow rate of the cold water supplied to the indoor heat exchanger 5A (the opening degree of the flow rate adjustment valve 5B) are constant, the blown air temperature rises. For this reason, 10 A of air conditioner control parts enlarge the opening degree of the flow regulating valve 5B according to the increase in ventilation volume so that the blowing air temperature may be maintained at the target blowing temperature Tao.

  In the normal control mode, the primary pump control unit 10C and the secondary pump control unit 10B have a preset flow rate (hereinafter also referred to as a target chilled water circulation amount Wro) unless a flow rate change command is received from the integrated control device 10. .)) Autonomously controls the primary pump P1 and the secondary pump P2 so that the cold water circulates.

  When the primary pump control unit 10C and the secondary pump control unit 10B receive the flow rate change command from the integrated control device 10, the received new circulation amount is set as the target cold water circulation amount Wro, and the primary pumps P1, 2 The next pump P2 is controlled autonomously.

  On the discharge side of the primary pump P1 or the secondary pump P2 (primary pump P1 in this embodiment), a cold water temperature sensor S2 for detecting the temperature of the cold water is provided. In the normal control mode, the heat source control unit 10 </ b> D sets the “target chilled water discharge temperature” set by the integrated control device 10 as the chilled water temperature detected by the chilled water temperature sensor S <b> 2 (hereinafter referred to as chilled water discharge temperature). (Hereinafter, it is referred to as the target cold water temperature Two.) "

  That is, the heat source control unit 10D autonomously controls the operation of the heat source unit 7A so as to be the current target cold water temperature Two, unless the new target cold water temperature Two is set by the integrated control device 10. For this reason, the heat source control unit 10D and the heat source unit 7A function as a cold water temperature adjusting device for setting the temperature of the cold water to the target cold water temperature Two.

  The integrated control device 10 determines the upper limit chilled water temperature Th based on the current target outlet temperature Tao, and determines the target chilled water temperature Two within a range equal to or lower than the upper limit chilled water temperature Th. That is, the integrated control device 10 can change the target cold water temperature Two within a range equal to or lower than the upper limit cold water temperature Th.

  In the present embodiment, a value obtained by subtracting a predetermined upper limit constant k (in this embodiment, 7 ° C. to 10 ° C.) from the current target blowing temperature Tao is set to the upper limit cold water temperature Th (= current target blowing temperature). Tao-k).

  That is, in the present embodiment, the upper limit chilled water temperature Th is determined based on the temperature of the air (blown air) cooled by the indoor heat exchanger 5A or the amount of cold heat required by the indoor heat exchanger 5A. Will be. Note that “the amount of cooling required in the indoor heat exchanger 5 </ b> A” is, for example, the amount of heat generated by the ICT device 1 or the amount of heat from the outer wall of the building.

  In the normal control mode, the cooling water pump control unit 10E sets the circulation amount of the cooling water “target circulation amount of cooling water (hereinafter referred to as target circulation amount Wfo)” set by the integrated control device 10. The cooling water pump P3 is controlled so that

  In the cooling tower control unit 10F, the temperature of the cooling water cooled in the cooling tower 7B is “target cooling water temperature (hereinafter referred to as target cooling water temperature Tco)” set by the integrated control device 10. The cooling tower 7B is controlled so that it becomes. The “cooling water temperature” is detected by the cooling water temperature sensor S3.

  In the normal control mode, if the chilled water discharge temperature cannot be cooled to the target chilled water temperature Two by only controlling the heat source unit 7A, the integrated control device 10 controls the cooling water pump control unit 10E and the cooling tower control. A command for increasing the target circulation amount Wfo or a command for decreasing the target cooling water temperature Tco is issued to at least one of the sections 10F.

2.2 Power saving control and margin <Power saving control mode>
The power saving control mode is a control mode that reduces the power consumption while ensuring the necessary cooling capacity by changing the target chilled water temperature Two to the upper limit chilled water temperature Th or the temperature near the upper limit chilled water temperature Th. It is.

<Degree>
The margin A is a parameter relating to the difference between the maximum heat exchange capability adjustable by the capability adjustment device and the actual heat exchange capability. In the present embodiment, even when each device is controlled by autonomous control in the normal control mode, the margin A is controlled to be maintained at a predetermined threshold value or more.

For example, the margin A for the air conditioning unit 5 is defined by one of the following.
(1) 1- (Average opening degree of a plurality of flow control valves 5B)
(2) 1-{(average of actual number of revolutions of indoor fan 5C / maximum number of revolutions of indoor fan 5C)}
Maximum number of rotations: upper limit number of rotations of each indoor fan 5C (3) 1 / {(average of blown air temperature-target blown temperature Tao)}
(4) 1-{(average of blown air temperature-target blow temperature Tao)} / n
n: A value corresponding to (blow air temperature−target blow temperature Tao), which is a preset value, that is, n means an allowable temperature difference (allowable deviation temperature).
(5) 1 / {(average of cold water discharge temperature−target cold water temperature Two)}
(6) 1-{(average of cold water discharge temperature−target cold water temperature Two)} / n
n: A value corresponding to (cold water discharge temperature−target cold water temperature Two), which is a preset value, that is, n means an allowable temperature difference (allowable deviation temperature).

2.3 Details of Control Operation FIG. 4 shows a control flow such as a power saving control mode. A program for executing this control is stored in advance in a nonvolatile storage unit such as a ROM provided in the integrated control apparatus 10. The program is executed by the CPU of the integrated control apparatus 10.

  This control is activated simultaneously with the activation of the air conditioning system. When this control is activated, first, it is determined whether or not the rotational speed or the air volume of all the indoor fans 5C is equal to or less than a predetermined threshold value (S1). If it is determined that all the rotational speeds or the air flow rates of the indoor fan 5C are larger than a predetermined threshold value (S1: NO), S1 is executed again.

  If it is determined that all the rotational speeds or air flow rates of the indoor fan 5C are equal to or less than a predetermined threshold (S1: YES), it is determined whether or not the room temperature Tr is lower than the indoor set target temperature Trs ( S3).

  When it is determined that the room temperature Tr is equal to or higher than the indoor set target temperature Trs (S3: NO), after the target blowing temperature Tao is increased and changed by a predetermined temperature (S5), the upper limit chilled water temperature Th is calculated and determined. (S9).

  When it is determined that the room temperature Tr is lower than the indoor set target temperature Trs (S3: YES), after the target blowing temperature Tao is changed by a predetermined temperature (S7), the upper limit chilled water temperature Th is calculated and determined. (S9).

  Next, after the margin A is calculated (S11), it is determined whether the margin A is equal to or greater than a predetermined threshold (S13). When it is determined that the margin A is less than a predetermined threshold value (S13: NO), after the target cold water temperature Two is changed (S15). S1 is executed.

  When it is determined that the margin A is equal to or greater than a predetermined threshold (S13: YES), it is determined whether or not the target chilled water temperature Two is equal to or lower than the upper limit chilled water temperature Th (S17). When it is determined that the target chilled water temperature Two is higher than the upper limit chilled water temperature Th (S17: NO), the target chilled water temperature Two is changed to be lowered (S15). S1 is executed.

When it is determined that the target cold water temperature Two is equal to or lower than the upper limit cold water temperature Th (S17: YES), after the target cold water temperature Two is changed (S19). S1 is executed.
In this control, the margin A is calculated in (5) or (6). For this reason, in this embodiment, after the cooling capacity (hereinafter referred to as “necessary capacity”) required in the indoor heat exchanger 5A is determined in S11, the target cold water temperature Two is determined from the current temperature in S13. It will be judged whether or not the necessary ability can be demonstrated even if it is raised.

  When it is determined that the necessary capacity can be exhibited, the target chilled water temperature Two is higher than the current temperature, and when it is determined that the necessary capacity cannot be exhibited, the target chilled water temperature Two is Lower than temperature.

3. Features of the air conditioning system according to the present embodiment In the present embodiment, the target cold water temperature Two is determined within the range of the upper limit cold water temperature Th or less, and the upper limit cold water temperature Th is cooled by the indoor heat exchanger 5A. It is determined on the basis of the temperature of the air (blowing air).

  For this reason, the cooling system operates so that the temperature of the chilled water becomes the upper limit chilled water temperature Th or a temperature in the vicinity of the upper limit chilled water temperature Th. Therefore, it is possible to reduce power consumption while ensuring the necessary cooling capacity. A heat medium circulation system can be obtained.

(Second Embodiment)
In the first embodiment, the upper limit chilled water temperature Th is determined based on the temperature of the air cooled in the indoor heat exchanger 5A or the amount of cooling required in the indoor heat exchanger 5A.

  On the other hand, in this embodiment, the temperature difference between the temperature of the air before being cooled by the indoor heat exchanger 5A and the air cooled by the indoor heat exchanger 5A, and the indoor heat exchanger 5A. The upper limit cold water temperature Th is determined on the basis of the amount of air blown to. In addition, said temperature difference is a parameter which shows the amount of cold heat currently processed with 5 A of indoor heat exchangers.

(Third embodiment)
In the above-described embodiment, the upper limit constant k used when determining the upper limit chilled water temperature Th is a fixed value. However, in this embodiment, the cooling capacity (hereinafter referred to as the outdoor air temperature or the indoor heat exchanger 5A) is required. The upper limit constant k is determined using an “incentive parameter E that induces fluctuations in power consumption”.

<Overview>
That is, the time change rate of the incentive parameter E is the incentive change rate dE / dt, and the value of the incentive parameter E at which the incentive change rate dE / dt is equal to or less than the preset change rate is the parameter value Eo.

  The integrated control device 10 stores the “actual power consumption W corresponding to the parameter value Eo and the parameter value Eo” every predetermined time or whenever the target cold water temperature Two is changed, in the storage unit 10G in the integrated control device 10. (See FIG. 2). And the integrated control apparatus 10 performs the process for re-determining the upper limit constant k, when the information content which shows the relationship between the inducement parameter E and the power consumption W satisfy | fills the requirement determined beforehand.

<Specific example>
Hereinafter, the case where the incentive parameter E is the outside air temperature will be specifically described as an example.
As shown in FIG. 5, the target cold water temperature Two is stored every time the “relationship between the actual power consumption W corresponding to the outside air temperature and the outside air temperature” is changed (S <b> 21 in FIG. 6).

  Next, the integrated control apparatus 10 performs a multiple regression analysis using a multiple regression analysis equation (for example, the least square method) using the outside air temperature and the target cold water temperature Two as variable terms (S23 in FIG. 6). In the multiple regression analysis, when the residual sum of squares is equal to or smaller than a predetermined threshold value or the determination coefficient is equal to or larger than the threshold value, the integrated control device 10 is limited so that the condition that the power consumption W is minimized can be reflected. The number k is determined again (S25 in FIG. 6).

  Thereby, in this embodiment, even if the outside air temperature or the air conditioning load fluctuates, the integrated control device 10 learns the fluctuations by itself and re-determines an appropriate upper limit constant k. The power consumption W can be reduced.

(Fourth embodiment)
In the above-described embodiment, the value obtained by subtracting the upper limit constant k from the current target blowing temperature Tao is defined as the upper limit cold water temperature Th. However, in the present embodiment, a value obtained by multiplying the current target blowing temperature Tao by the upper limit coefficient k1 is used. This is the upper limit cold water temperature Th. The upper limit coefficient k1 may be a fixed value or a value determined by learning using the incentive parameter E.

(Other embodiments)
In the above-described embodiment, the present invention is suitable for an air conditioning system using only cold heat, but the application of the present invention is not limited to this, and the present invention is also applied to an air conditioning system that can also use hot and cold heat. it can.

  In the above-described embodiment, water is used as the heat medium, and the heat exchange target is air. However, the application of the present invention is not limited to this. For example, the heat exchange target is a coolant, and The present invention can also be applied to a cooling system that supplies a cooling liquid to a heat dissipation part of an ICT device.

  In the above-described embodiment, the ICT device 1 has been described as an example of the heat generating device. However, the present invention is not limited to this, and power supply such as a storage battery or an uninterruptible power supply for supplying power to the ICT device. It can also be applied to equipment.

Although the heat source device 7 according to the above-described embodiment is a water-cooled type including the cooling tower 7B, the present invention is not limited to this, and may be an air-cooled heat source device 7 (heat source unit 7A). Good.
The air conditioning system according to the above-described embodiment performs air conditioning of the server room in which the ICT equipment is installed. However, the present invention is not limited to this, and is applied to, for example, an air conditioning system for office buildings. Is possible.

  In the above-described embodiment, each control unit 10A to 10F is configured by a controller capable of autonomous control, and the integrated control device 10 is configured to control each control unit 10A to 10F in an integrated manner. Is not limited to this.

  That is, for example, the control units 10A to 10F and the integrated control device 10 may be used as one controller, and the entire air conditioning system (heat medium circulation system) may be controlled by the single integrated control device 10.

Although the cooling tower 7B according to the above-described embodiment is a hermetic cooling tower, the present invention is not limited to this, and may be, for example, an open cooling tower 7B.
Although the heat source device 7 according to the above-described embodiment has the cooling tower 7B, the present invention is not limited to this, and the cooling tower 7B is abolished, and the high-pressure side heat exchanger ( For example, the system which cools a condenser in air | atmosphere may be sufficient.

  The air conditioning system according to the above-described embodiment performs air conditioning of the server room in which the ICT equipment is installed. However, the present invention is not limited to this, and is applied to, for example, an air conditioning system for office buildings. Is possible.

  In the above-described embodiment, the present invention has been described with the upper limit chilled water temperature Th as the target capacity of the heat exchange capacity generated by the indoor heat exchanger 5A. These parameters may be the target ability.

  In the above-described embodiment, the cold heat is generated by the vapor compressor type refrigerator, but the present invention is not limited to this. For example, when the waste heat can be sufficiently secured, the adsorption type refrigerator Or you may produce | generate cold with an absorption refrigerator.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

DESCRIPTION OF SYMBOLS 1 ... ICT apparatus 3 ... Rack 3A ... Cool air passage 3C ... Duct space 3B ... Passage 5 ... Air-conditioning unit 5A ... Indoor heat exchanger 5B ... Flow control valve 7 ... Heat source device 7A ... Heat source device 7B ... Cooling tower 7C ... Outdoor fan 7D ... Sprinkler 7E ... Outdoor heat exchanger 10 ... Integrated controller 10A ... Air conditioner controller 10B ... Secondary pump controller 10C ... Primary pump controller 10D ... Heat source controller 10E ... Coolant pump controller

Claims (10)

A heat source device that generates cold heat and cools a heat medium (hereinafter referred to as “cold water”) with the cold heat;
A heat exchanger for exchanging heat between the cold water and the heat exchange object, and cooling the heat exchange object;
A chilled water temperature determining unit for determining a target temperature (hereinafter referred to as a “target chilled water temperature”) within a range of an upper limit temperature or less;
An upper limit temperature determining unit that determines the upper limit temperature based on at least the temperature of the heat exchange target cooled in the heat exchanger, or the amount of cooling required in the heat exchanger;
A heat medium circulation system comprising: The heat exchange object is air blown into a room,
The upper limit temperature determination unit is based on the temperature difference between the temperature of the air before being cooled by the heat exchanger and the air cooled by the heat exchanger, and the amount of air blown to the heat exchanger. The heat medium circulation system according to claim 1, wherein an upper limit temperature is determined. The heat exchange object is air blown into a room,
A room temperature sensor for detecting the temperature of indoor air;
A blown air temperature adjusting device for setting the temperature of the air cooled by the heat exchanger to a target temperature (hereinafter referred to as “target blown temperature”);
A blowing set temperature changing unit that changes the target blowing temperature based on a temperature difference between a target indoor air temperature and a room air temperature detected by the room temperature sensor;
The heat medium circulation system according to claim 1, wherein the upper limit temperature determination unit determines the upper limit temperature based on the current target blowing temperature. The cold water temperature determining unit is
A necessary capacity determining unit that determines a cooling capacity required for the heat exchanger (hereinafter referred to as “necessary capacity”), and whether the necessary capacity can be exhibited even if the target chilled water temperature is higher than a current temperature. Has a necessary ability judgment section to judge
Furthermore, the said chilled water temperature determination part makes the said target chilled water temperature higher than the present temperature, when it is judged that the said required capability judgment part can exhibit, The Claim 2 or 3 characterized by the above-mentioned. Heat medium circulation system.   5. The heat medium according to claim 4, wherein the chilled water temperature determination unit makes the target chilled water temperature lower than a current temperature when it is determined by the necessary capacity determination unit that it cannot be exhibited. Circulation system. A blower that adjusts the amount of air cooled and blown into the room by the heat exchanger;
4. The heat medium according to claim 3, wherein the blowing set temperature changing unit is capable of changing the target blowing temperature when the blowing amount by the blower is equal to or less than a predetermined blowing amount. 5. Circulation system. When the time change rate of the inducement parameter that induces fluctuations in power consumption is an inducement change rate, and the value of the incentive parameter that is less than or equal to a preset change rate is a parameter value,
The upper limit temperature determining unit includes an actual power consumption corresponding to the parameter value and a storage unit that stores the parameter value, and determines the upper limit temperature based on content stored in the storage unit. The heat medium circulation system according to claim 4 or 5.   The heat medium circulation according to claim 7, wherein the upper limit temperature determining unit determines the upper limit temperature when an information amount indicating a relationship between the inducing parameter and power consumption satisfies a predetermined requirement. system. In a heat medium circulation system that has a heat source device that generates heat and circulates a heat medium that moves the heat,
A heat exchanger for exchanging heat between the heat medium and a heat exchange target;
A capacity adjusting device for making the heat exchange capacity generated in the heat exchanger a target capacity;
A target ability determining unit for determining the target ability;
When the time change rate of the inducement parameter that induces fluctuations in power consumption is an inducement change rate, and the value of the incentive parameter that is less than or equal to a preset change rate is a parameter value,
The target capability determining unit includes a storage unit that stores actual power consumption corresponding to the parameter value and the parameter value, and determines the target capability based on contents stored in the storage unit. Heat medium circulation system.   The heat medium circulation according to claim 9, wherein the target capacity determination unit determines the target capacity when an information amount indicating a relationship between the incentive parameter and power consumption satisfies a predetermined requirement. system.