JP2007205605A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save energy in a system as a whole by setting a target water supply temperature of a chiller/heater while considering a level of the importance (weighting) of each air conditioner, in the air conditioning system comprising the chiller/heater supplying cold/hot water to a plurality of air conditioners. <P>SOLUTION: This air conditioning system comprises a plurality of the air conditioners (24) exchanging heat by cold/hot water supplied from the chiller/heater (22). This air conditioning system further comprises an allowable water supply temperature setting portion 31 for determining an allowable water supply temperature of the cold/hot water of each air conditioner (24) on the basis of an air supply temperature of the air conditioner (24), and a general water supply temperature setting portion (32) for determining a target water supply temperature of the chiller/heater (22) by calculating a plurality of allowable water supply temperatures determined by the allowable water supply temperature setting portion (31) according to the weighting of each air conditioner (24). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioning system, and particularly relates to energy saving measures.

  2. Description of the Related Art Conventionally, an air conditioning system including a plurality of air conditioners that perform air conditioning by exchanging heat with cold / hot water that has been sent (see, for example, Patent Document 1). This air conditioning system includes a heat source device that cools or heats cold / hot water, a plurality of air conditioners, and a flow control valve for cold / hot water provided for each air conditioner. Each air conditioner supplies air that has been heat-exchanged with the supplied cold / hot water to the user side. The flow rate control valve adjusts the flow rate of cold / hot water in the air conditioner so that the supply temperature of the air conditioner becomes the set temperature.

Moreover, the said air conditioning system is provided with the water supply temperature control apparatus which controls the water supply temperature of the cold / hot water in a heat-source unit based on the air-conditioning state of each air conditioner. This water supply temperature control device determines the temperature state of cold water or hot water for each air conditioner in each air conditioner based on the opening state of the flow control valve, the deviation between the supply air temperature and its set temperature, etc. . Specifically, it is determined for each air conditioner whether the chilled water temperature should be “increased”, “decrease”, and “maintain”. And the water supply temperature control device reduces the water supply temperature in the heat source device if there is at least one air conditioner that is determined to be “to lower” the cold water temperature, for example. In addition, the water supply temperature control device can supply water in the heat source unit if there is no air conditioner that is determined to “lower” the chilled water temperature and there are more than a predetermined number of air conditioners that are determined to “increase” the chilled water temperature. Increase temperature.
Japanese Patent Laid-Open No. 11-63631

  However, in the air conditioning system of Patent Document 1 described above, for example, if there is at least one air conditioner that should lower the cold water temperature, the water supply temperature of the heat source machine is lowered, so that the energy consumption of the heat source machine is wasted. There was a problem that there was.

  Specifically, there are some places where air conditioning is performed, such as office rooms and reception rooms, and other places such as corridors and warehouses. Here, for example, when an air conditioner at an important place exhibits necessary capacity, but an air conditioner at an insignificant place has insufficient capacity, the air conditioning system determines that the entire system is insufficient. Then, the water supply temperature of the heat source machine is changed. That is, there is a case where the water supply temperature control of the heat source device is influenced by an unimportant place, resulting in a problem that wasteful energy is consumed.

  The present invention has been made in view of such a point, and the object of the present invention is to provide an air conditioning system including a chilled / hot water machine that supplies chilled / warm water to a plurality of air conditioners. It is intended to save energy of the whole system by setting the target water supply temperature of the chiller / heater in consideration of weighting.

  1st invention cools or heats cold / hot water, the cold / hot water machine (22), and the some air conditioner which supplies the air which heat-exchanged the cold / hot water sent from this cold / hot water machine (22) to a utilization side ( 24) is assumed.

  The present invention also includes an allowable water supply temperature setting means (31) for determining an allowable water supply temperature of the cold / warm water for each air conditioner (24) based on the supply air temperature of the air conditioner (24), and the allowable water supply temperature setting. Calculate the allowable water supply temperature of each air conditioner (24) input from the means (31) according to the preset weight of each air conditioner (24), and target water supply of cold / hot water in the cold / hot water machine (22) Comprehensive water supply temperature setting means (32) for determining the temperature.

  In said invention, the cold / hot water cooled or heated to predetermined temperature with the cold / hot water machine (22) is sent to each air conditioner (24). In the air conditioner (24), air whose temperature is adjusted by exchanging heat with cold / hot water is supplied to the user side.

  In this air conditioning system, the allowable water supply temperature setting means (31) sets the allowable water supply temperature of cold / hot water for each air conditioner (24) based on the current supply air temperature (supply air temperature). That is, the current load level of the air conditioner (24) is estimated from the supply air temperature of the air conditioner (24), and the water supply temperature of the air conditioner (24) corresponding to the load level is calculated as the allowable water supply temperature. The allowable water supply temperature of each air conditioner (24) is input to the integrated water supply temperature setting means (32).

  In the total water supply temperature setting means (32), each input allowable water supply temperature is calculated based on the weighting of the air conditioner (24), and the target water supply temperature of the cold / hot water in the cold / hot water machine (22) is calculated. That is, the higher the weighting of the air conditioner (24), the higher the priority, and the temperature that is the same as or close to the allowable water supply temperature of the air conditioner (24) tends to be set as the target water supply temperature of the cold / hot water machine (22). Conversely, a temperature slightly deviated from the allowable water supply temperature of the air conditioner (24) with a low weight tends to be set as the target water supply temperature of the cold / hot water machine (22). As a result, the target water supply temperature of the chiller / heater (22) is appropriately adjusted according to the importance of the air-conditioning place, compared to the case where the temperature control is performed by considering the air-conditioning place with high importance and the air-conditioning place with low importance. Be controlled.

  In addition, in a second aspect based on the first aspect, the allowable water supply temperature setting means (31) is configured such that the difference between the water supply temperature at the rated capacity of the air conditioner (24) and the allowable water supply temperature is an air conditioner ( The allowable water supply temperature of the air conditioner (24) is determined so as to be the same as the difference between the supply air temperature at the rated capacity of 24) and the current supply air temperature.

  In the above invention, for each air conditioner (24), the supply air temperature at the rated capacity (when the cooling load and the heating load are 100%) and the water supply temperature required at that time are determined in advance. The current load level of the air conditioner (24) is easily estimated from the difference between the current supply air temperature and the supply air temperature at the rated capacity. By adding or subtracting the difference in the supply air temperature from the water supply temperature at the rated capacity, the allowable water supply temperature corresponding to the load level is calculated.

  Further, according to a third aspect of the present invention, in the first or second aspect of the invention, the total water supply temperature setting means (32) is configured to allow each of the air conditioners (24) of a higher weighting group in the cooling operation. The minimum value of the water supply temperature is set as a representative value, and the value between the average value and the minimum value of each allowable water supply temperature is set as a representative value for the air conditioners (24) in the low weight group. . And the said comprehensive water supply temperature setting means (32) is the target water supply temperature of the cold / hot water in a cold / hot water machine (22) among a representative value of the said high weight group, and a representative value of the said low weight group. Is configured to be defined as

  In said invention, it is a setting method of the target water supply temperature in case an air conditioner (24) performs air_conditionaing | cooling operation. For example, the plurality of air conditioners (24) are divided into a high weight group and a low weight group. The total water supply temperature setting means (32) sets the lowest allowable water supply temperature among the allowable water supply temperatures of the higher weighted group as a representative value of the allowable water supply temperature of the group. In a group with a low weight, the total water supply temperature setting means (32) determines that the value between the average value of the plurality of allowable water supply temperatures of the group and the lowest allowable water supply temperature is the allowable water supply temperature of the group. Set as a representative value. In other words, these representative values are the capability requirement values of each group.

  Next, the lower one of these representative values is set as the target water supply temperature in the cold / hot water machine (22) by the total water supply temperature setting means (32). For example, when the representative value of the group with high weight is low, that is, when the capacity requirement value of the group with high weight is high, the capacity shortage does not occur in all the air conditioners (24). In addition, when the representative value of the low weight group is low, that is, when the capacity requirement value of the low weight group is high, the capacity of the air conditioner (24) of the low weight group is achieved while providing the capacity of the high weight group. It can be suppressed appropriately.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the total water supply temperature setting means (32) is configured to allow each air conditioner (24) of a high weighting group in the heating operation. The maximum value of the water supply temperature is set as a representative value, and the value between the average value and the maximum value of each allowable water supply temperature is set as a representative value for the air conditioners (24) in the low weight group. . And the said comprehensive water supply temperature setting means (32) is the target water supply temperature of the cold / hot water in a cold / hot water machine (22) among a representative value of the group with a high weight, and a representative value of the group with a low weight. Is configured to be defined as

  In said invention, it is a setting method of the target water supply temperature in case an air conditioner (24) performs heating operation. For example, the plurality of air conditioners (24) are divided into a high weight group and a low weight group. The total water supply temperature setting means (32) sets the highest allowable water supply temperature as a representative value of the allowable water supply temperature of the group among the allowable water supply temperatures of the highly weighted group. Further, in a group with a low weight, the total water supply temperature setting means (32) determines that the value between the average value of the plurality of allowable water supply temperatures of the group and the maximum allowable water supply temperature is the allowable water supply temperature of the group. Set as a representative value. In other words, this representative value becomes the capability requirement value of each group.

  Next, the higher one of these representative values is set as the target water supply temperature in the chiller / heater (22) by the total water supply temperature setting means (32). For example, when the representative value of the group with high weight is high, that is, when the capacity requirement value of the group with high weight is high, the capacity shortage does not occur in all the air conditioners (24). In addition, when the representative value of the low weight group is high, that is, when the capacity requirement value of the low weight group is high, the capacity of the air conditioner (24) of the low weight group is provided while providing the capacity of the high weight group. It can be suppressed appropriately.

  Therefore, according to the present invention, the allowable water supply temperature of the cold / warm water for each air conditioner (24) is determined based on the supply air temperature of the air conditioner (24), and each of the air conditioners in which the plurality of allowable water supply temperatures are set in advance. It calculated according to the weight of a machine (24), and determined the target water supply temperature in the said cold / hot water machine (22). As a result, it is possible to set the target water supply temperature suitable for the required capacity for the air-conditioning place with high importance while setting the target water supply temperature suitable for the capacity lower than the required capacity for the place with low importance. it can. In other words, the target water supply temperature in the chiller / heater (22) can be estimated to be lower or higher than when performing temperature control considering all air-conditioning places equally, so the energy consumption of the chiller / heater (22) The amount can be appropriately suppressed. As a result, energy saving of the system can be achieved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As shown in FIG. 1, the air conditioning system (10) of this embodiment includes a cold / hot water circuit (20) in which cold / hot water circulates as a heat medium. In the cold / hot water circuit (20), a water pump (21), a cold / hot water machine (22), and a plurality of air conditioners (24) are sequentially connected. The plurality (six in this embodiment) of air conditioners (24) are connected in parallel to the water supply pump (21) and the cold / hot water machine (22).

  The cold / hot water machine (22) is a so-called air-cooled heat pump chiller that cools or heats cold / hot water to a predetermined temperature (set water supply temperature), and constitutes a heat source machine of the air conditioning system (10).

  The water pump (21) is located on the inlet side of the cold / hot water machine (22) and circulates cold / hot water between the cold / hot water machine (22) and the plurality of air conditioners (24). The water pump (21) is configured such that the rotational speed is inverter-controlled and the capacity is variable.

  Each said air conditioner (24) supplies the air cooled or heated with cold / hot water to the utilization side (for example, a drawing room, a dining room, a hallway, etc.). Specifically, each air conditioner (24) includes a heat exchanger (25) and a two-way valve (26). The heat exchanger (25) is configured to exchange heat between cold / hot water and air to cool or heat the air. The two-way valve (26) is provided on the outlet side of the heat exchanger (25) and constitutes a flow rate control valve that controls the flow rate of cold / hot water by adjusting the opening.

  Each air conditioner (24) is provided with an air temperature sensor (TS) which is a temperature detecting means for detecting the temperature of air to be supplied (air supply temperature). The two-way valve (26) is configured to control the flow rate of the cold / hot water so that the temperature detected by the air temperature sensor (TS) becomes a predetermined temperature (set air temperature). That is, for example, in the case of cooling operation, when the detected temperature is lower than the set supply air temperature, the above-described two-way valve (26) reduces the chilled water flow rate by reducing the opening, and the detected temperature is higher than the set supply air temperature. Open the opening to increase the cold / hot water flow rate. Each air conditioner (24) is provided with a fan (not shown) for taking air into the heat exchanger (25).

  The cold / hot water circuit (20) includes a supply header (23) on the outlet side of the cold / hot water machine (22) and a return header (27) on the inlet side of the cold / hot water machine (22). . That is, the chilled / hot water discharged from the chiller / heater (22) is sent to the air conditioners (24) via the supply header (23), and the chilled / warm water discharged from the air conditioners (24) is returned to the return header (27). Return to the hot and cold water machine (22) via

  The air conditioning system (10) includes a controller (30). The controller (30) is provided with an allowable water supply temperature setting unit (31), an integrated water supply temperature setting unit (32), a weighting input unit (33), and a chiller / heater control unit (34). These setting means (31, 32, 33, 34) will be described with reference to FIG.

  In the weighting input unit (33), weighting is input in advance for the six (No. 1 to No. 6) air conditioners (24) by the user before the start of operation. Specifically, in this embodiment, the six air conditioners (24) are divided into three stages (three groups) of “highest priority group”, “normal group”, and “ignore group”. The weights are lower in the order of “highest priority group”, “normal group”, and “ignore group”. That is, the “highest priority group” is the highest weighting and the “ignore group” is the lowest weighting.

The permissible water supply temperature setting unit (31) receives the detected temperature (supply air temperature) of the air temperature sensor (TS) for each air conditioner (24) during operation. This allowable water supply temperature setting unit (31) is configured to set (calculate) the allowable water supply temperature (TsP) of the cold / hot water of each air conditioner (24) based on the supply air temperature (S1 in FIG. 2). ). Specifically, the allowable water supply temperature (TsP) is calculated based on the following formula (1) or formula (2).
During cooling: TsP = Tssc + (Tsa-Tsac) (1)
During heating: TsP ＝ Tssh− (Tsah−Tsa) (2)
Here, Tsa indicates the current supply air temperature. Tsac and Tsah indicate the supply air temperature at the time of cooling rating and heating rating, respectively. Tssc and Tssh indicate the water supply temperature at the time of cooling rating and heating rating, respectively. The cooling rated time and the heating rated time mean that the cooling load and the heating load in the air conditioner (24) are 100%.

  That is, the permissible water supply temperature setting unit (31) estimates the current load level of the air conditioner (24) from the relationship between the current supply air temperature and the supply air temperature at the rated capacity, and supplies water that matches the load level. The temperature is calculated. Therefore, in both cases of cooling and heating, the lower the supply air temperature, the lower the allowable water supply temperature (TsP), and the higher the supply air temperature, the higher the allowable water supply temperature (TsP). It will be highly estimated.

  The total water supply temperature setting unit (32) receives the allowable water supply temperature (TsP) of each air conditioner (24) calculated by the allowable water supply temperature setting unit (31) during operation. The total water supply temperature setting unit (32) is configured to calculate a representative value of the allowable water supply temperature (TsP) for each weighting group input by the weighting input unit (33) (FIG. 2). S2).

Specifically, the representative value (TsP1) of the allowable water supply temperature (TsP) in the “highest priority group” is set based on the following formula (3) or formula (4).
During cooling: TsP1 = the lowest allowable water supply temperature (TsP) in the “highest priority group” (3)
During heating: TsP1 = the highest allowable water supply temperature (TsP) in the “highest priority group” (4)

In this way, since the lowest value is adopted as the representative value (TsP1) at the time of cooling and the highest value at the time of heating, in all the air conditioners (24) with high importance, at least the lack of capacity does not occur. The air conditioning capacity more than necessary can be surely exhibited.
The representative value (TsP2) of the allowable water supply temperature (TsP) in the “normal group” is calculated based on the following formula (5) or formula (6).
During cooling: TsP2 = TsPmin + (TsPave-TsPmin) x X / 100 (5)
During heating: TsP2 = TsPmax-(TsPmax-TsPave) x X / 100 (6)
Here, TsPmin and TsPmax respectively indicate the lowest allowable water supply temperature (TsP) and the highest allowable water supply temperature (TsP) in the “normal group”. TsPave indicates an average value of three allowable water supply temperatures (TsP) of the “normal group”. X represents an intermediate value calculation coefficient, and can be arbitrarily set within a range of 0 to 100%.

  For example, when X = 100% is set, the representative value (TsP2) is an average value (TsPave). Accordingly, in the “normal group”, there are air conditioners (24) that can perform more than necessary, and other air conditioners (24) that are insufficient in capacity. Then, as X approaches 0%, the representative value (TsP2) approaches the minimum value (TsPmin) during cooling. In this case, the number of air conditioners (24) that can perform more than necessary is increased. That is, by changing the value of X, it is possible to adjust the risk that the capacity-deficient air conditioner (24) will increase.

  In this way, not all of the air conditioners (24) that are not so important will be able to perform more than necessary, and some air conditioners (24) may be insufficient. The representative value (TsP2) is defined in That is, the representative value of the allowable water supply temperature (TsP) is estimated to be high during cooling and is estimated to be low during heating. In addition, these representative values (TsP1, TsP2) represent, in other words, capability requirement values of each group.

  Moreover, the representative value of the allowable water supply temperature (TsP) in the “ignore group” is not set, and any allowable water supply temperature (TsP) is ignored.

And the said integrated water supply temperature setting part (32) is comprised so that the target water supply temperature (Tst) of a cold / hot water machine (22) may be defined based on the representative value of the allowable water supply temperature (TsP) of each group calculated above. (S3 in FIG. 2). Specifically, the target water supply temperature (Tst) of the cold / hot water machine (22) is calculated by the following formula (7) or formula (8).
During cooling: Tst = lower value of TsP1 and TsP2 during cooling (7)
During heating: Tst = higher value of TsP1 and TsP2 during heating (8)

  The chiller / heater controller (34) is configured to control the water supply temperature of the chiller / heater (22) based on the target water supply temperature (Tst) determined by the total water supply temperature setting unit (32). (S4 in FIG. 2).

-Driving action-
Next, the operation of the air conditioning system (10) according to this embodiment will be described.

  When the water pump (21) is driven, cold / hot water having a set water supply temperature flows from the cold / hot water machine (22) to the air conditioners (24) via the supply header (23). In each air conditioner (24), the cold / hot water exchanges heat with air and passes through the two-way valve (26). The cold / hot water of each air conditioner (24) gathers at the return header (27), then returns to the cold / hot water machine (22) through the water pump (21) and repeats this circulation. During this operation, in each air conditioner (24), the opening degree of the two-way valve (26) is adjusted so that the supply air temperature becomes the set supply air temperature.

  Next, the control operation of the controller (30) will be described for each of CASE1 to CASE4 in FIG. Here, a case where the air conditioner (24) performs a cooling operation will be described.

  First, before starting the above operation, the weight of each air conditioner (24) is input to the weight input unit (33) by the user. In this embodiment, no. 1 and no. No. 2 air conditioner (24) is assigned to “No. 3-No. No. 5 air conditioner (24) is assigned to the “normal group”. Six air conditioners (24) are set in the “ignore group”.

  In the case of CASE 1 in FIG. 3, the supply air temperature of each air conditioner (24) is input to the allowable water supply temperature setting unit (31) during the above operation. In the allowable water supply temperature setting unit (31), the allowable water supply temperature (TsP) of each air conditioner (24) is calculated based on the above formula (1) and input to the total water supply temperature setting unit (32). In the present embodiment, for example, the cooling rated supply air temperature (Tsac) is set to 12 ° C., and the cooling rated water supply temperature (Tssc) is set to 7 ° C., respectively. Each set temperature can be arbitrarily changed.

In the total water supply temperature setting section (32), the minimum allowable water supply temperature (TsP) of 11 ° C. is set as the representative value (TsP1) of the “highest priority group”. Further, the representative value (TsP2) of the “normal group” is calculated as follows based on the above formula (5), and the representative value of the “ignored group” becomes none. In the present embodiment, for example, the intermediate value calculation coefficient (X) is set to 20%.
TsP2 ＝ 8 ℃ ＋ (31 ℃ / 3−8 ℃) × 20/100 ＝ 8.46 ℃ ≒ 8.5 ℃
Then, in the total water supply temperature setting section (32), the representative value (TsP1) of the “top priority group” and the representative value (TsP2) of the “normal group” are compared, and the lower representative value (TsP2) 8.5 ℃ is set as the target water supply temperature (Tst).

  In the case of CASE 2 in FIG. 3, the allowable water supply temperature (TsP) of each air conditioner (24) is calculated by the allowable water supply temperature setting unit (31) and input to the general water supply temperature setting unit (32) as in CASE 1. The

  In the total water supply temperature setting unit (32), the minimum allowable water supply temperature (TsP) of 7 ° C. is set as the representative value (TsP1) of the “highest priority group”. Further, as the representative value (TsP2) of “normal group”, 8.5 ° C. is calculated similarly to the above CASE 1, and the representative value of “ignore group” is none. Then, in the total water supply temperature setting section (32), the representative value (TsP1) of the “highest priority group” and the representative value (TsP2) of the “normal group” are compared, and the lower representative value (TsP1) 7 ℃ is set as the target water supply temperature (Tst).

  In the case of CASE 3 in FIG. 3, the allowable water supply temperature (TsP) of each air conditioner (24) is calculated by the allowable water supply temperature setting unit (31) and input to the general water supply temperature setting unit (32) as in CASE 1. The In CASE 3, the “highest priority group” No. Air conditioners (1) and (2) are stopped.

  In the total water supply temperature setting unit (32), the representative value (TsP1) of the “top priority group” and the representative value of the “ignore group” are both set to none. In addition, 8.5 ° C. is calculated as the representative value (TsP2) of the “normal group” in the same manner as the case 1 described above. In the total water supply temperature setting section (32), the representative value (TsP2) of 8.5 ° C. of the “normal group” is set as the target water supply temperature (Tst).

  In the case of CASE 4 in FIG. 3, the allowable water supply temperature (TsP) of each air conditioner (24) is calculated by the allowable water supply temperature setting unit (31) and input to the general water supply temperature setting unit (32) as in the case CASE1. The In CASE 4, “No. When the third air conditioner (24) is stopped, the allowable water supply temperature (TsP) is set to none.

In the total water supply temperature setting section (32), the representative value (TsP1) of the “highest priority group” is set at the lowest allowable water supply temperature (TsP) of 9 ° C. Further, the representative value (TsP2) of the “normal group” is calculated as follows based on the above formula (5), and the representative value of the “ignored group” becomes none.
TsP2 = 10 ℃ + (23 ℃ / 2-10 ℃) × 20/100 = 10.3 ℃
Then, in the total water supply temperature setting section (32), the representative value (TsP1) of the “top priority group” and the representative value (TsP2) of the “normal group” are compared, and the lower representative value (TsP1) 9 ℃ is defined as the target water supply temperature (Tst).

-Effect of the embodiment-
As described above, according to this embodiment, the allowable water supply temperature of cold / warm water for each air conditioner (24) is determined based on the supply air temperature of the air conditioner (24), and the plurality of allowable water supply temperatures are determined for each air conditioner. It calculated according to the weight of a machine (24), and determined the target water supply temperature in the said cold / hot water machine (22). As a result, for air-conditioned places with high importance, the target water supply temperature is suitable for the required capacity, and for places with low importance, air-conditioners (24) with partial capacity may be generated. The water supply temperature can be set. In other words, the target water supply temperature in the chiller / heater (22) can be estimated to be lower or higher than when performing temperature control considering all air-conditioning places equally, so the energy consumption of the chiller / heater (22) The amount can be appropriately suppressed. As a result, energy saving of the system can be achieved.

  For the “highest priority group” with high weighting, the lowest allowable water supply temperature (the highest allowable water supply temperature in the case of heating) is set as the representative value (capacity requirement value) of multiple groups As a result, there is no shortage of capacity in all of the air conditioners (24) in the group.

  For the “normal group” that is not so high in weight, the lowest allowable water supply temperature (maximum allowable water supply temperature in the case of heating) and the average value of the multiple allowable water supply temperatures. Since the value between them is set as the representative value (capacity requirement value) of the group, it is possible to avoid a state in which sufficient capacity is exhibited in all the air conditioners (24) of the group. That is, it is possible to set the water supply temperature to a value at which the operating efficiency of the cold / hot water machine (22) becomes higher, leaving the possibility of insufficient capacity in some of the air conditioners (24). Therefore, the energy consumption of the cold / hot water machine (22) can be suppressed reliably.

  As described above, the present invention is useful as an air conditioning system including a plurality of air conditioners that exchange heat with cold / hot water as a heat medium.

1 is a piping system diagram illustrating an overall configuration of an air conditioning system according to an embodiment. It is a flowchart which shows the flow of the whole control. It is a table | surface which shows the example of calculation of target water supply temperature.

Explanation of symbols

10 Air conditioning system
22 Water heater / cooler
24 Air conditioner
31 Allowable water supply temperature setting section
32 Total water supply temperature setting section

Claims (4)

A chiller / heater (22) that cools or heats the chilled / warm water, and a plurality of air conditioners (24) that supply the heat-exchanged air with the chilled / warm water sent from the chiller / warm water (22) to the user side. An air conditioning system,
An allowable water supply temperature setting means (31) for determining an allowable water supply temperature of the cold / warm water for each air conditioner (24) based on the supply air temperature of the air conditioner (24);
In the cold / hot water machine (22), the allowable water supply temperature of each air conditioner (24) input from the allowable water supply temperature setting means (31) is calculated according to the preset weight of each air conditioner (24). An air conditioning system comprising: a general water supply temperature setting means (32) for determining a target water supply temperature of cold / hot water. In claim 1,
The allowable water supply temperature setting means (31) is such that the difference between the water supply temperature at the rated capacity of the air conditioner (24) and the allowable water supply temperature is the supply air temperature at the rated capacity of the air conditioner (24) and the current supply air. An air conditioning system configured to determine an allowable water supply temperature of the air conditioner (24) so as to be the same as a difference from the temperature. In claim 1 or 2,
The total water supply temperature setting means (32)
In the case of cooling operation, the lowest value of each allowable water supply temperature is set as a representative value for the air conditioners (24) in the higher weight group, and each allowable water supply is set for the air conditioners (24) in the lower weight group. Set a value between the average and minimum temperature as a representative value,
Of the representative value of the high weight group and the representative value of the low weight group, the low representative value is defined as the target water supply temperature of the cold / hot water in the cold / hot water machine (22). Air conditioning system. In claim 1 or 2,
The total water supply temperature setting means (32)
In the case of heating operation, the maximum value of each allowable water supply temperature is set as a representative value for the air conditioners (24) in the high weight group, and each allowable water supply is set for the air conditioners (24) in the low weight group. Set a value between the average and maximum temperature as a representative value,
Of the representative value of the high weight group and the representative value of the low weight group, the high representative value is set as the target water supply temperature of the cold / hot water in the cold / hot water machine (22). Air conditioning system.

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