JP4553715B2 - Cooling water system - Google Patents

Description

  The present invention relates to a cooling water system, and more particularly, the supply flow rate of cooling water to a water-cooled heat source device is adjusted according to the operating state of the heat source device by adjusting the output of the cooling water pump. The present invention relates to a so-called variable flow cooling water system that saves energy and saves energy.

  Conventionally, what is generally well known as a variable flow rate cooling water system as described above includes a cooling water outlet temperature to which is the temperature of the used cooling water W delivered from the heat source device 1 as shown in FIG. Is detected by the outlet temperature sensor 9, and the output of the cooling water pump Pw is adjusted based on the cooling water outlet temperature to detected by the outlet temperature sensor 9, so that the cooling water outlet temperature to is kept at the set target temperature too. There is a system of a cooling water outlet temperature constant control system that adjusts the cooling water supply flow rate q to the heat source device 1 (see Patent Document 1 below).

  With this type of cooling water system, the outlet temperature sensor 9 only needs to be equipped as a means for detecting the operating state of the heat source device 1, so that the system configuration is simplified and the outlet temperature sensor 9 detects the system. Since the output of the cooling water pump Pw is adjusted based only on the cooling water outlet temperature to, the control algorithm itself has the advantage of being simple, and the cooling water outlet temperature to is kept at a constant temperature, In the adjustment of the cooling water supply flow rate q with respect to the load change of the device 1 and the temperature change of the cooling water W supplied to the heat source device 1 (that is, the change of the cooling water inlet temperature ti), the operation characteristics of the heat source device 1 are stably maintained. It is said that it is excellent in terms.

JP 2000-283527 A

  However, in the cooling water system of the cooling water outlet temperature constant control method described above, the cooling water supply flow rate q to the heat source device 1 is adjusted so as to keep the cooling water outlet temperature to constant. Even with a small load fluctuation (in other words, a relatively small fluctuation in the required cooling amount) and a relatively small change in the cooling water inlet temperature ti, the cooling water supply flow rate q to the heat source device 1 is greatly changed, and the heat source The flow rate of the cooling water W in the cooling heat exchanging portion 1a of the apparatus 1 changes greatly. For this reason, although the cooling water outlet temperature to is kept constant, the cooling water flow rate for cooling the heat source apparatus 1 is larger than the large change in the cooling water flow rate as described above. There is a phenomenon in which the operating characteristics of the heat source device 1 change due to a large change in the heat exchange efficiency in the heat exchanging unit 1a. As a result, even in the adoption of the variable flow rate type, the heat source device 1 is included. System Overall energy saving of a problem to be limiting.

  In addition, when the cooling water inlet temperature ti, which is the temperature of the cooling water W supplied to the heat source device 1, is lowered, if the temperature drop is of a level that does not deteriorate the operation characteristics of the heat source device 1, the cooling efficiency is improved. Although the operating efficiency of the heat source device 1 is improved, in the conventional system in which the cooling water outlet temperature to is kept constant, the cooling water W in the heat exchanger 1a for cooling in the heat source device 1 is reduced for the decrease in the cooling water inlet temperature ti. As a result, there is a problem that energy saving as a whole system is limited.

  In view of this situation, a main problem of the present invention is to provide a cooling water system that is more excellent in terms of energy saving by adopting a rational system configuration.

To configure the cooling water system,
A cooling water pump that supplies cooling water to the water-cooled heat source device, an outlet temperature sensor that detects a cooling water outlet temperature that is a temperature of used cooling water sent from the heat source device, and an outlet temperature sensor that detects the cooling water outlet temperature. Control means for adjusting the cooling water supply flow rate to the heat source device by adjusting the output of the cooling water pump according to the cooling water outlet temperature.
In response to a change in the cooling water outlet temperature detected by the outlet temperature sensor within the set temperature range, the control means sets the cooling water supply flow rate to the heat source device by adjusting the output to the cooling water pump. It may be configured to change proportionally within the range .

In other words, according to this configuration , the cooling water supply flow rate to the heat source device is changed proportionally within the set flow rate range with respect to the change in the set temperature range of the cooling water outlet temperature. If the flow rate range is appropriately selected, changes in the cooling water outlet temperature within a certain range (typically changes over the entire set temperature range) in response to changes in the heat source device load and cooling water inlet temperature. The cooling water supply flow rate to the heat source device can be appropriately changed in an allowable form.

  Therefore, compared with the above-described conventional system that simply maintains the cooling water outlet temperature at a constant temperature, the cooling water outlet temperature is allowed to change in a certain range, and accordingly, the load of the heat source device is changed and the cooling water inlet temperature is changed. The change in the cooling water supply flow rate to the heat source device can be suppressed, and accordingly, the change in the cooling water flow rate in the heat exchange part for cooling of the heat source device and the heat exchange efficiency (cooling) due to the change in the cooling water flow rate. (Efficiency) changes can be suppressed, thereby effectively preventing changes in the operating characteristics of the heat source device caused by a large change in the cooling water flow velocity at the cooling heat exchange section of the heat source device. Can do.

  In addition, when the cooling water inlet temperature decreases, the cooling water outlet temperature is allowed to change within a certain range, so that the cooling water outlet temperature is used for cooling in the heat source device as compared with the conventional system that simply maintains the cooling water outlet temperature at a constant temperature. The average temperature of the cooling water in the heat exchange part can be lowered, and the operating efficiency of the heat source device can be improved accordingly.

  In addition, although the change of the cooling water outlet temperature is allowed, the allowable range is an appropriate range to a certain extent and is limited, so the characteristics of the conventional system that maintains the cooling water outlet temperature at a constant temperature can be obtained. In order to prevent a change in the operating characteristics of the heat source device due to a large change in the cooling water outlet temperature (substantially a large change in the average temperature of the cooling water in the heat exchange section for cooling of the heat source device). Can do.

For these reasons, according to the above configuration , compared with the conventional system in which the cooling water outlet temperature is simply maintained at a constant temperature, the heat source is adjusted in the adjustment of the cooling water supply flow rate with respect to the load change of the heat source device and the change of the cooling water inlet temperature. The operation characteristics of the device can be maintained more effectively and stably. This is combined with the adoption of a variable flow rate for supplying the cooling water to the heat source device, and also when the cooling water inlet temperature decreases. In combination with the improvement of the operation efficiency of the system, it is possible to further promote the energy saving of the entire system including the heat source device.

In addition, according to the above configuration , as in the conventional system described above, the system configuration is simplified as the means for detecting the operating state of the heat source device is only equipped with the outlet temperature sensor, and the outlet temperature Since the output of the cooling water pump is adjusted based on only the cooling water outlet temperature detected by the sensor, the control algorithm itself can be simplified, and this can be advantageous in terms of system cost.

In the implementation of the above configuration, the position of the outlet temperature sensor is not limited to the outlet of the used cooling water in the heat source device, but is located in the middle of the flow path for guiding the used cooling water sent from the heat source device. May be.

  Various control methods such as inverter control can be employed for adjusting the output of the cooling water pump by the control means (that is, adjusting the water supply amount).

  Although the cooling water supply flow rate to the heat source device is changed proportionally within the set flow rate range with respect to the change within the set temperature range of the cooling water outlet temperature, the proportional change is proportional to the change of the cooling water outlet temperature. The rate of change of the cooling water supply flow rate is not limited to a fixed, strictly proportional change, but the rate of change of the cooling water supply flow rate with respect to the change of the cooling water outlet temperature at the upper limit side and the lower limit side in the set temperature range of the cooling water temperature May be a proportional change or the like that is somewhat different.

  In addition, the cooling water supply flow rate is not limited to a continuous change with respect to the change in the cooling water outlet temperature, and the cooling water supply flow rate may be changed stepwise with respect to the change in the cooling water outlet temperature. Good.

  Appropriate measures should be taken in response to various conditions such as maintaining the cooling water supply flow rate at the upper limit flow rate of the set flow rate range as a countermeasure when the cooling water outlet temperature becomes higher than the upper limit temperature of the set temperature range. Similarly, as a countermeasure when the cooling water outlet temperature becomes lower than the lower limit temperature of the set temperature range, various conditions such as maintaining the cooling water supply flow rate at the lower limit flow rate of the set flow rate range, etc. Appropriate measures should be taken depending on the situation.

  The cooling water supplied to the heat source device by the cooling water pump is not limited to the cooling water circulated between the cooling tower and the heat source device, and may be the cooling water supplied temporarily to the heat source device. Good.

To implement the above configuration,
In contrast to the heat source device being an absorption refrigerator, the control means is detected by the outlet temperature sensor when the detected temperature of the regenerator in the absorption refrigerator is equal to or higher than a set upper limit regeneration temperature. Prior to the adjustment of the cooling water supply flow rate based on the cooling water outlet temperature, the cooling water supply flow rate to the absorption chiller as the heat source device is adjusted to the set safe flow rate by adjusting the output to the cooling water pump. May be.

That is, according to this configuration , the cooling water supply flow rate to the heat source device is proportional to the set flow rate range with respect to the change in the set temperature range of the cooling water outlet temperature based on the cooling water outlet temperature detected by the outlet temperature sensor. In the situation where the above-mentioned temperature-proportional cooling water supply flow rate adjustment is changed (especially in the situation where the cooling water supply flow rate to the heat source device is limited by the flow rate adjustment) When the detected temperature of the regenerator in the absorption refrigerator as a heat source device is equal to or higher than the set upper limit regeneration temperature, the heat source is prioritized over the adjustment of the cooling water supply flow rate based on the cooling water outlet temperature. Since the cooling water supply flow rate to the absorption chiller as a device is adjusted to the set safe flow rate, if an appropriate flow rate is selected as the set safe flow rate, the operation of the absorption chiller due to an abnormal rise in regenerator temperature Dora Le, can be prevented with a cooling water supply of sufficient quantity effective against the absorption chiller.

Therefore, according to this configuration , when the absorption chiller is used as a cooling water supply target heat source device, it is based on the cooling water outlet temperature while ensuring high maintainability as a whole system including the absorption chiller. By adjusting the cooling water supply flow rate in proportion to the above-described temperature, energy saving as a whole system can be further promoted.

In the implementation of this configuration , the set safety flow rate is not limited to a flow rate larger than the upper limit flow rate of the set flow rate range in the temperature proportional cooling water supply flow rate adjustment based on the cooling water outlet temperature. It may be an in-range flow rate within a set flow rate range, such as an upper limit flow rate range.

In the implementation of this configuration , the absorption chiller is not limited to the absorption refrigeration machine, but may be an absorption cold / hot water generator.

In this configuration, the absorption refrigerator is used as a heat source device for cooling water supply, but the above-described temperature proportional cooling water supply flow rate adjustment based on the cooling water outlet temperature (that is, the cooling water supply by the previous configuration) In the situation where the adjustment of the flow rate is being implemented, if the heat source device is assumed to have a situation that requires a change in the cooling water supply flow rate in addition to the change in the cooling water outlet temperature , Similar to the configuration, when such a situation occurs, the cooling water supply flow rate to the heat source device is adjusted by adjusting the output to the cooling water pump in preference to the above-described temperature proportional cooling water supply flow rate adjustment based on the cooling water outlet temperature. It is desirable to adopt a configuration in which the flow rate is adjusted to meet the demand.

To configure the cooling water system,
A cooling water pump that supplies cooling water to the water-cooled heat source device, an operation state detection unit that detects an operation state of the heat source device, and the cooling water according to the operation state of the heat source device detected by the operation state detection unit Control means for adjusting the output of the cooling water to adjust the cooling water supply flow rate to the heat source device, and an air conditioner for adjusting the temperature and humidity by cooling and dehumidifying the air supplied to the air-conditioning target area and reheating following the cooling and dehumidification Prepared,
This air conditioner may be configured to perform reheating following cooling and dehumidification of the air supplied to the air-conditioning target area using the used cooling water sent from the heat source device as a heat source .

  That is, in the variable flow rate cooling water system that adjusts the cooling water supply flow rate to the heat source device by adjusting the output of the cooling water pump according to the operating state of the heat source device detected by the operating state detection means, the cooling water pump is Compared to a fixed-flow cooling system that always supplies a constant and large flow rate of cooling water to the heat source device at rated output operation, it is possible to avoid excessive supply of cooling water to the heat source device. The temperature of the used cooling water (cooling water outlet temperature) is increased, and the temperature fluctuation is also reduced.

Focusing on this, in the above configuration , a variable flow rate cooling water system is used in the air conditioner to adjust the temperature and humidity by cooling dehumidification and reheating (heating) following the cooling dehumidification in the air conditioning target area. As described above, the used cooling water delivered from the heat source device in a high temperature state and with a small temperature fluctuation is used as a heat source (in other words, exhaust heat of the heat source device which is the retained heat of the used cooling water). Is used as a heat source) to reheat following cooling and dehumidification of the air supplied to the air-conditioning target area.

Therefore, according to the above configuration , all the retained heat of the used cooling water sent from the heat source device (exhaust heat of the heat source device) is discarded to the outside by a cooling tower or the like, and the supply air to the air conditioning target area is Compared to conventional systems that use a heat medium heated by a dedicated heating device such as a boiler as a heat source to adjust temperature and humidity, and reheat the air that is supplied to the air-conditioning target area after cooling and dehumidification, it is a target for variable flow rate cooling water supply. The amount of energy consumed by the system can be reduced by effectively using the exhaust heat of a heat source device for reheating following cooling and dehumidification of the supply air to the air-conditioning target area, thereby changing the supply of cooling water to the heat source device. Combined with the adoption of the flow rate type, it is possible to further promote energy saving as the entire system including the air conditioner.

In the implementation of the above configuration , in order to adjust the cooling water supply flow rate to the heat source device according to the operating state of the heat source device, an outlet temperature sensor is provided as an operating state detecting means, and the cooling water detected by the outlet temperature sensor is provided. A method of adjusting the cooling water supply flow rate to the heat source device so as to keep the cooling water outlet temperature at the set target temperature by adjusting the output of the cooling water pump based on the outlet temperature, or an outlet temperature sensor as an operating state detection means And an inlet temperature sensor, and adjusting the output of the cooling water pump based on the cooling water outlet temperature detected by the outlet temperature sensor and the cooling water inlet temperature detected by the inlet temperature sensor, In the range belonging to the variable flow rate type, such as the method of adjusting the cooling water supply flow rate to the heat source device so that the temperature difference with the cooling water inlet temperature is kept at the set temperature difference It is possible to adopt the people of the adjustment method.

  In addition, various control methods such as inverter control can be adopted for adjusting the output of the cooling water pump by the control means (that is, adjusting the water supply amount).

The implementation of the above configuration is not limited to the configuration in which the amount of heat required for reheating following cooling and dehumidification of the supply air to the air conditioning target area is covered by the retained heat amount of the used cooling water sent from the heat source device. Only a part of the amount of heat required for reheating following cooling and dehumidification of the supply air to the area is covered by the amount of heat stored in the used cooling water sent from the heat source device, and the other parts are supplemented by another heating device. May be.

  The cooling water supplied to the heat source device by the cooling water pump is not limited to the cooling water circulated between the cooling tower, the heat source device, and the reheating unit of the air conditioner, but the reheating of the heat source device and the subsequent air conditioner. It may be cooling water that is temporarily supplied to the part.

To implement the above configuration,
As the operating state detecting means, an outlet temperature sensor for detecting a cooling water outlet temperature which is a temperature of used cooling water sent from the heat source device is provided,
The control means sets a cooling water supply flow rate to the heat source device by adjusting an output to the cooling water pump with respect to a change in a set temperature range of the cooling water outlet temperature detected by the outlet temperature sensor. It may be configured to change proportionally within the range .

That is, as described above, the temperature-proportional cooling water supply flow rate that changes the cooling water supply flow rate to the heat source device proportionally within the set flow rate range with respect to the change in the cooling water outlet temperature within the set temperature range. In the adjustment, if the set temperature range and set flow rate range are appropriately selected, the cooling water outlet temperature is allowed to change within a certain range with respect to the load change of the heat source device and the change of the cooling water inlet temperature. Therefore, the cooling water supply flow rate to the heat source device can be appropriately changed, and compared with the conventional system in which the cooling water supply flow rate is simply adjusted to maintain the cooling water outlet temperature at a constant temperature, It is possible to maintain the operating characteristics of the heat source device more effectively and stably in adjusting the cooling water supply flow rate in response to load changes and cooling water inlet temperature changes. Efficiency can be further improved.

Accordingly, although to temperature and humidity adjusting the supply air to the air conditioning target zone, to re-heat following the cooling dehumidification of the supply air to the air conditioning target area for spent cooling water sent from the heat source device by using the heat source arrangement In addition, the temperature-proportional cooling water supply flow rate is adjusted to change the cooling water supply flow rate to the heat source device proportionally within the set flow rate range in response to changes in the cooling water outlet temperature within the set temperature range. According to the above configuration , the variable flow rate is basically adopted for the cooling water supply to the heat source device, the energy consumption of the system can be saved by the effective use of the exhaust heat of the heat source device, and the cooling water supply Combined with the ability to maintain the operating characteristics of the heat source device effectively and stably in adjusting the flow rate and further improving the operating efficiency of the heat source device when the cooling water inlet temperature decreases, the heat source device and the air conditioner were included. Entire system The energy-saving and can be further more enhanced.

In addition, according to the above- described configuration , as described above, the system configuration is simplified as the means for detecting the operating state of the heat source device is only equipped with an outlet temperature sensor. Since the output of the cooling water pump is adjusted based only on the cooling water outlet temperature, the control algorithm itself can be simplified, and this can be advantageous in terms of system cost.

In the implementation of the above configuration, the position of the outlet temperature sensor is not limited to the outlet of the used cooling water in the heat source device, but is located in the middle of the flow path for guiding the used cooling water sent from the heat source device. May be.

As described above , in order to change the cooling water supply flow rate to the heat source device proportionally within the set flow range with respect to the change in the set temperature range of the cooling water outlet temperature, the proportional change is The rate of change of the cooling water supply flow rate with respect to the temperature change is not limited to a fixed and strictly proportional change, but the cooling water supply with respect to the change of the cooling water outlet temperature at the upper limit side and the lower limit side in the set temperature range of the cooling water temperature It may be a proportional change in which the change rate of the flow rate is different to some extent.

  In addition, the cooling water supply flow rate is not limited to a continuous change with respect to the change in the cooling water outlet temperature, and the cooling water supply flow rate may be changed stepwise with respect to the change in the cooling water outlet temperature. Good.

  Appropriate measures should be taken in response to various conditions such as maintaining the cooling water supply flow rate at the upper limit flow rate of the set flow rate range as a countermeasure when the cooling water outlet temperature becomes higher than the upper limit temperature of the set temperature range. Similarly, as a countermeasure when the cooling water outlet temperature becomes lower than the lower limit temperature of the set temperature range, various conditions such as maintaining the cooling water supply flow rate at the lower limit flow rate of the set flow rate range, etc. Appropriate measures should be taken depending on the situation.

In the practice of the above-described structure, when the heat source device is a absorption refrigerator, similar to the above, when the detected temperature of the regenerator in an absorption refrigerating machine is equal to or greater than the set upper limit regeneration temperature is detected by the outlet temperature sensor cooling Prior to the adjustment of the cooling water supply flow rate based on the water outlet temperature, the cooling water supply flow rate to the absorption chiller as the heat source device is adjusted to the set safe flow rate by adjusting the output to the cooling water pump. desirable.

[1] Here, the first characteristic configuration of the present invention is:
A cooling water pump that supplies cooling water to the water-cooled heat source device, an outlet temperature sensor that detects a cooling water outlet temperature that is a temperature of used cooling water sent from the heat source device, and an outlet temperature sensor that detects the cooling water outlet temperature. The control means for adjusting the cooling water supply flow rate to the heat source device by adjusting the output of the cooling water pump according to the cooling water outlet temperature, and the air supplied to the air-conditioning target area is cooled and dehumidified. With air conditioner that adjusts temperature and humidity by heat,
This air conditioner includes a waste heat utilization reheat unit that performs reheating following cooling and dehumidification of supply air to the air-conditioning target area using the used cooling water sent from the heat source device as a heat source, and is different from the heat source device. The heat medium heated by the heating device is used as a heat source, and a configuration including a reheating portion for compensation that performs reheating following cooling and dehumidification of air supplied to the air-conditioning target area,
The control means sets a cooling water supply flow rate to the heat source device by adjusting an output to the cooling water pump with respect to a change in a set temperature range of the cooling water outlet temperature detected by the outlet temperature sensor. It is in the point which is set as the structure which changes proportionally within.
That is, according to this configuration, as described above, the cooling water supply flow rate to the heat source device is changed proportionally within the set flow rate range with respect to the change in the set temperature range of the cooling water outlet temperature. If the temperature range and the set flow rate range are selected appropriately, changes in the cooling water outlet temperature within a certain range with respect to changes in the load of the heat source device and changes in the cooling water inlet temperature (typically the entire range of the set temperature range) The cooling water supply flow rate to the heat source device can be appropriately changed.
Therefore, compared with the above-described conventional system that simply maintains the cooling water outlet temperature at a constant temperature, the cooling water outlet temperature is allowed to change in a certain range, and accordingly, the load of the heat source device is changed and the cooling water inlet temperature is changed. The change of the cooling water supply flow rate to the heat source device can be suppressed, and accordingly, the change in the cooling water flow rate in the cooling heat exchange part of the heat source device and the heat exchange efficiency (cooling) due to the change in the cooling water flow rate. (Efficiency) changes can be suppressed, thereby effectively preventing changes in the operation characteristics of the heat source device caused by a large change in the cooling water flow velocity at the cooling heat exchange section of the heat source device. Can do.
In addition, when the cooling water inlet temperature decreases, the cooling water outlet temperature is allowed to change within a certain range, so that the cooling water outlet temperature is used for cooling in the heat source device as compared with the conventional system that simply maintains the cooling water outlet temperature at a constant temperature. The average temperature of the cooling water in the heat exchange part can be lowered, and the operating efficiency of the heat source device can be improved accordingly.
In addition, although the change of the cooling water outlet temperature is allowed, the allowable range is an appropriate range to a certain extent and is limited, so the characteristics of the conventional system that maintains the cooling water outlet temperature at a constant temperature can be obtained. In order to prevent a change in the operating characteristics of the heat source device due to a large change in the cooling water outlet temperature (substantially a large change in the average temperature of the cooling water in the heat exchange section for cooling of the heat source device). Can do.
For these reasons, according to the above configuration, compared with the conventional system in which the cooling water outlet temperature is simply maintained at a constant temperature, the heat source is adjusted in the adjustment of the cooling water supply flow rate with respect to the load change of the heat source device and the change of the cooling water inlet temperature. The operation characteristics of the device can be maintained more effectively and stably. This is combined with the adoption of a variable flow rate for supplying the cooling water to the heat source device, and also when the cooling water inlet temperature decreases. In combination with the improvement of the operation efficiency of the system, it is possible to further promote the energy saving of the entire system including the heat source device.
In addition, according to the above configuration, as in the conventional system described above, the system configuration is simplified as the means for detecting the operating state of the heat source device is only equipped with the outlet temperature sensor, and the outlet temperature Since the output of the cooling water pump is adjusted based on only the cooling water outlet temperature detected by the sensor, the control algorithm itself can be simplified, and this can be advantageous in terms of system cost.
Furthermore, in the above configuration, the temperature and humidity of the air supplied to the air-conditioning target area in the air conditioner are adjusted by cooling and dehumidification and reheating (heating) following the cooling and dehumidification. The used cooling water sent from the heat source device in a state of low temperature fluctuation is used as the heat source (in other words, the exhaust heat of the heat source device that is the retained heat of the used cooling water is used as the heat source. In addition, since the reheating following the cooling and dehumidification of the air supplied to the air-conditioning target area is performed in the exhaust heat reheating unit, all the retained heat of the used cooling water sent from the heat source device (exhaust heat of the heat source device) In order to adjust the temperature and humidity of the air supplied to the air-conditioning target area with a cooling tower, etc., the cooling medium is used to cool and dehumidify the air supplied to the air-conditioning target area using a heat medium heated by a dedicated heating device such as a boiler as a heat source. A conventional system that performs reheating following In addition, energy consumption of the system can be reduced by effectively using the exhaust heat of the heat source device that is the target of variable flow rate cooling water supply for reheating following cooling and dehumidification of the supply air to the air conditioning target area. Thus, in combination with the adoption of the variable flow rate for supplying the cooling water to the heat source device, it is possible to further promote the energy saving of the entire system including the air conditioner.
And in the said structure, the exhaust-heat utilization reheating part which performs the reheating following the cooling dehumidification of the supply air to an air-conditioning object area | region using the used cooling water sent from the said heat-source device as a heat source in the said structure , since a configuration and a compensating reheating section for performing reheating following the cooling dehumidification of the supply air to the air conditioning target zone the heating medium heated by another heating device as the heat source and the heat source device, also the following advantages Obtainable.

In other words, according to the above configuration, when the temperature and retained heat amount of the used cooling water sent from the heat source device are sufficient, the used cooling water is used as a heat source to the air conditioning target area only in the exhaust heat reheating unit. If the temperature of the used cooling water sent from the heat source device and the amount of retained heat are insufficient, the used cooling water can be separated from the used heating device. Reheating following cooling and dehumidification of the air supplied to the air-conditioning target area in both the exhaust heat reheating part and the compensation reheating part using both the heating heat medium and the heat source as heat sources, or in a separate heating device Reheating following cooling and dehumidification of the supply air to the air-conditioning target area can be performed only in the compensation reheating section using the heating heat medium as the heat source. In this regard, the used cooling water sent from the heat source device is used. Reheat following cooling and dehumidification of the air supplied to the air conditioning target area While adopting a construction, it is possible to obtain a high functionality in temperature and humidity adjusting side of the supply air to the air conditioning target area.
In the implementation of the first characteristic configuration, when the cooling water is circulated between the cooling tower and the heat source device, the used cooling water in the cooling water return path is short-circuited to the cooling water forward path in a state of bypassing the cooling tower. The main bypass passage and a bypass flow rate adjustment valve that adjusts the short-circuit flow rate of the used cooling water through the main bypass passage are provided, and cooling is performed based on the detected value of the cooling water inlet temperature that is the temperature of the cooling water supplied to the heat source device. A cooling water temperature controller is provided that adjusts the bypass flow rate adjustment valve to adjust the short-circuit flow rate through the main bypass path so that the water inlet temperature is kept above the set lower limit inlet temperature. The cooling water inlet temperature may be prevented from becoming excessively low due to an excessive heat release amount of the cooling water W.
[2] The second characteristic configuration of the present invention specifies an embodiment suitable for the implementation of the first characteristic configuration.
The control means sets a cooling water supply flow rate to the heat source device with respect to a change in the set temperature range of the cooling water outlet temperature detected by the outlet temperature sensor, and a preset cooling water outlet temperature. The configuration is such that a proportional change is made within the set flow rate range in accordance with a set proportional relationship with the cooling water supply flow rate.
[3] The third characteristic configuration of the present invention specifies an embodiment suitable for the implementation of the second characteristic configuration.
The set proportional relationship is that the rate of change of the cooling water supply flow rate with respect to the change of the cooling water outlet temperature is different between the upper limit side and the lower limit side of the set temperature range.
[4] The fourth characteristic configuration of the present invention specifies an embodiment suitable for the implementation of any of the first to third characteristic configurations,
When the temperature of the air sent from the air conditioner can be adjusted to the set supply air temperature only by reheating in the exhaust heat reheating part, the heat source is stopped in the state where reheating in the compensation reheating part is stopped. Adjusting the temperature of the air sent from the air conditioner to the set supply air temperature by adjusting the supply flow rate of the used cooling water sent from the device to the exhaust heat reheating part,
In addition, when the temperature of the air sent from the air conditioner cannot be adjusted to the set supply air temperature only by reheating in the exhaust heat utilization reheating unit, the exhaust heat utilization of the used cooling water delivered from the heat source device is not possible. With the supply flow rate to the reheating unit maximized, the temperature of the air sent from the air conditioner is adjusted by adjusting the supply flow rate of the heating medium from the other heating device to the compensation reheating unit. A reheat controller for adjusting the set supply air temperature is provided.
[5] The fifth characteristic configuration of the present invention specifies an embodiment suitable for any one of the first to fourth characteristic configurations.
In contrast to the heat source device being an absorption refrigerator, the control means is detected by the outlet temperature sensor when the detected temperature of the regenerator in the absorption refrigerator is equal to or higher than a set upper limit regeneration temperature. Prior to the adjustment of the cooling water supply flow rate based on the cooling water outlet temperature, the cooling water supply flow rate to the absorption chiller as the heat source device is adjusted to the set safe flow rate by adjusting the output to the cooling water pump. It is in a certain point.
That is, according to this configuration, as described above, the cooling water supply flow rate to the heat source device is set to the set flow rate with respect to the change in the setting range of the cooling water outlet temperature based on the cooling water outlet temperature detected by the outlet temperature sensor. Under circumstances where the temperature-proportional cooling water supply flow rate is adjusted proportionally within the range (particularly under conditions where the cooling water supply flow rate to the heat source device is reduced by adjusting the flow rate). When the detected temperature of the regenerator in the absorption chiller as the heat source device exceeds the preset upper limit regeneration temperature for some reason, priority is given to the above-described temperature proportional cooling water supply flow rate adjustment based on the cooling water outlet temperature. Since the cooling water supply flow rate to the absorption refrigerator as a heat source device is adjusted to the set safe flow rate, if an appropriate flow rate is selected as the set safe flow rate, the absorption type due to abnormal rise in regenerator temperature frozen Trouble driving, it is possible to prevent effectively with the cooling water supply in an amount sufficient for the absorption chiller.
Therefore, according to this configuration, when the absorption chiller is used as a cooling water supply target heat source device, it is based on the cooling water outlet temperature while ensuring high maintainability as a whole system including the absorption chiller. By adjusting the cooling water supply flow rate in proportion to the above-described temperature, energy saving as a whole system can be further promoted.

  FIG. 1 shows a cooling water system of an air conditioner. 1 is an absorption refrigerator that cools cold water C returning from a load device such as an air conditioner or a heat storage tank through a cold water return path 2, and is cooled by the absorption refrigerator 1. The chilled water C is fed to the load device and the heat storage tank through the chilled water forward path 3 by the chilled water pump Pc.

  Reference numeral 4 denotes air A supplied to an air-conditioning target area (for example, a constant temperature / humidity chamber or a clean room) by cooling dehumidification in the cooling coil 4a and reheating in the reheating coils 4b and 4c following the cooling dehumidification. This air conditioner adjusts the temperature and humidity, and the air A adjusted in temperature and humidity by the air conditioner 4 is supplied to the air-conditioning target area through the air supply duct 5 by the air supply fan F. Keep in humidity.

  1a is a cooling heat exchange part in the absorption refrigeration machine 1, and the cooling water W is supplied between the cooling heat exchange part 1a and the cooling tower 6 through the cooling water forward path 7 and the cooling water return path 8 by the cooling water pump Pw. , The generated exhaust heat in the absorption refrigeration machine 1 is recovered with the supply cooling water W from the cooling tower 6, and the cooling water W sent from the cooling heat exchange unit 1 a is recovered in the cooling tower 6. The recovered waste heat is discharged to the outside by exchanging heat with the outside air.

  Reference numeral 9 denotes an outlet temperature sensor for detecting a cooling water outlet temperature to which is the temperature of the used cooling water W delivered from the absorption refrigerator 1. Reference numeral 10 denotes a cooling water outlet temperature to detected by the outlet temperature sensor 9. The cooling water flow controller 10 adjusts the output of the cooling water pump Pw by inverter control and adjusts the cooling water supply flow rate q to the absorption refrigeration machine 1. Execute the controls (a) and (b).

  (A) The cooling water supply flow rate p to the absorption chiller 1 is set to the cooling water outlet temperature to and the cooling as shown in FIG. 2 with respect to the change in the set temperature range X of the cooling water outlet temperature to. The cooling water pump Pw is inverter-controlled according to the cooling water outlet temperature to detected by the outlet temperature sensor 9 so as to change proportionally within the set flow rate range Y according to the setting proportional relationship K with the water supply flow rate q.

  That is, in the example of the set proportional relationship K shown in FIG. 2, the set temperature range X is 32 ° C. to 37 ° C., and the flow rate is 50% of the maximum water supply amount qmax of the cooling water pump Pw (= 0.5 × qmax) The 100% flow rate (= qmax) is set to the set flow rate range Y. Therefore, for example, when the cooling water outlet temperature to detected by the outlet temperature sensor 9 is 34 ° C., the cooling water supply flow rate q to the absorption refrigerator 1 Is 70% flow rate (= 0.7 × qmax), and when the cooling water outlet temperature to detected by the outlet temperature sensor 9 is 36 ° C., the cooling water supply flow rate q to the absorption refrigerator 1 is The cooling water supply flow rate q to the absorption refrigeration machine 1 is automatically adjusted in proportion to the temperature by inverter control for the cooling water pump Pw so that the flow rate becomes 90% (= 0.9 × qmax).

  If the cooling water outlet temperature to detected by the outlet temperature sensor 9 is higher than the upper limit temperature 37 ° C. of the set temperature range X, the cooling water supply flow rate q to the absorption chiller 1 is set to the upper limit of the set flow rate range Y. When the cooling water outlet temperature to detected by the outlet temperature sensor 9 is lower than the lower limit temperature 32 ° C. of the set temperature range X, the absorption chiller is adjusted and maintained at a flow rate of 100% (= qmax). The cooling water supply flow rate q to 1 is adjusted and maintained at a 50% flow rate (= 0.5 × qmax) which is the lower limit flow rate of the set flow rate range Y.

  (B) The temperature ts of the regenerator (a high-temperature regenerator in a double-effect absorption refrigerator) detected by the regeneration temperature sensor 11 provided in the absorption refrigerator 1 is the set upper limit regeneration temperature tss (for example, 95 When the temperature is higher than or equal to (° C.), prior to the adjustment of the cooling water supply flow rate proportional to the temperature (b) based on the cooling water outlet temperature to, the inverter control for the cooling water pump Pw is used to control the absorption refrigerator 1. The cooling water supply flow rate q is adjusted to a set safe flow rate qss (for example, 100% flow rate).

  That is, in the cooling water system of this air conditioning equipment, as the variable flow rate control of the supply cooling water W to the absorption refrigeration machine 1, the change in the cooling water outlet temperature to within the set temperature range X as described in (a) above. By adjusting the temperature-proportional cooling water supply flow rate that proportionally changes the cooling water supply flow rate q to the absorption refrigerator 1 within the set flow rate range Y, the load change of the absorption refrigerator 1 and the absorption type A configuration that allows a change in the cooling water outlet temperature to within a certain range with respect to a change in the cooling water inlet temperature ti in the refrigerator 1 (that is, absorption due to a large change in the cooling water flow velocity in the cooling heat exchange section 1a). Absorption refrigeration machine in the form of suppressing both the change in the operation characteristics of the refrigerating refrigerator 1 and the change in the operation characteristics of the absorption refrigerating machine 1 due to a large change in the cooling water temperature in the cooling heat exchanger 1a) The cooling water supply flow rate q to 1 Sincerely to change.

  In addition, while adopting a variable flow rate formula that changes the cooling water supply flow rate q to the absorption chiller 1, the detected temperature ts of the regenerator in the absorption chiller 1 is the set upper limit regeneration temperature tss as shown in (B) above. When the above is reached, the cooling water supply flow rate q to the absorption chiller 1 is adjusted to the set safe flow rate qss in preference to the temperature proportional flow rate adjustment (b) based on the cooling water outlet temperature to. This effectively prevents an operation trouble of the absorption refrigerator 1 due to an abnormal increase in the regenerator temperature ts.

  The air conditioner 4 that adjusts the temperature and humidity of the supply air A to the air-conditioning target area has exhaust heat as a reheating coil that reheats (heats) the air A that has been cooled and dehumidified to the required absolute humidity by the cooling coil 4a. The utilization reheating coil 4b and the compensation reheating coil 4c are arranged in that order from the upstream side in the air flow direction, and the exhaust heat utilization reheating coil 4b on the upstream side is provided from the absorption refrigerator 1 A heat medium supply configuration is provided in one of the branch flow paths 8a and 8b provided in the cooling water return path 8 so that the exhaust heat reheating coil 4b sends out the heat from the absorption refrigerator 1. The cooling dehumidified air A is reheated by using a part of the used cooling water W as a heat source heat medium.

  In addition, the compensation reheating coil 4c on the downstream side has a heating medium supply configuration in which a hot water supply path 13 from a heating device 12 such as a boiler is connected, whereby the compensation reheating coil 4c is heated by the heating device 13. The generated hot water H is used as a heat source heat medium to reheat the cooled dehumidified air A.

The used cooling water W from the absorption refrigeration machine 1 in a state where the other diversion channel 8b bypasses the exhaust heat utilization reheating coil 4b with respect to the one diversion channel 8a interposing the exhaust heat utilization reheating coil 4b. 14a and 14b are three-way valves for adjusting the diversion ratio of the used cooling water W to the exhaust heat reheat coil 4b and the bypass 8b, and the diversion flow by the three-way valves 14a and 14b . By adjusting the supply flow rate of the used cooling water W to the exhaust heat reheat coil 4b by adjusting the ratio, the amount of reheat in the exhaust heat reheat coil 4b is adjusted.

  Reference numeral 15 denotes a flow rate adjustment valve that adjusts the supply flow rate of the hot water H to the compensation reheat coil 4c. By adjusting the hot water supply flow rate by the flow rate adjustment valve 15, the reheat amount in the compensation reheat coil 4c is adjusted. .

Reference numeral 16 denotes a supply air temperature sensor for detecting the temperature ta of the temperature / humidity adjustment air A sent from the air conditioner 4. Reference numeral 17 denotes a three-way valve 14, 14 b and a flow rate adjustment valve 15 based on the detection air temperature ta by the supply air temperature sensor 16. This is a reheat controller that adjusts the temperature ta of the delivery air A from the air conditioner 4 to the set supply air temperature taa (in other words, the set reheat temperature). The controller 17 performs a control operation as shown in the following (a) and (b).

(A) When the temperature ta of the delivery air A can be adjusted to the set supply air temperature taa only by reheating in the exhaust heat utilization reheating coil 4b using the used cooling water W from the absorption refrigerator 1 as a heat source, The air temperature detected by the supply air temperature sensor ta under the condition that the supply of hot water to the compensation reheating coil 4c is stopped by closing the flow control valve 15 and the reheating in the compensation reheating coil 4c is stopped. By adjusting the three-way valves 14a and 14b based on the above, the reheat amount in the exhaust heat reheat coil 4b is adjusted, thereby adjusting the temperature ta of the delivery air A from the air conditioner 4 to the set supply air temperature taa.

(B) When the temperature ta of the delivery air A cannot be adjusted to the set supply air temperature taa only by reheating in the exhaust heat reheating coil 4b using the used cooling water W from the absorption refrigerator 1 as a heat source The three-way valves 14a and 14b are adjusted so as to maximize the supply flow rate of the used cooling water W to the exhaust heat utilization reheating coil 4b, in other words, the amount of reheating in the exhaust heat utilization reheating coil 4b (in other words, the preheating amount). ) Is increased as much as possible, the flow rate adjusting valve 15 is adjusted based on the air temperature ta detected by the supply air temperature sensor 16 to adjust the reheat amount in the compensation reheating coil 4c. Is adjusted to the set supply air temperature taa.

  In other words, in the cooling water system of this air conditioning equipment, the temperature to of the used cooling water W sent from the absorption chiller 1 is maintained at a high temperature by the variable flow rate control of the cooling water W as described above. The high-temperature used cooling water W is effectively used as a heat source for reheating the air A following the cooling and dehumidification in the air conditioner 4, thereby reducing the energy consumption of the entire system.

  Further, as the reheating coil, the exhaust heat reheating coil 4b for reheating the cooled dehumidified air A using the used cooling water W delivered from the absorption chiller 1 as a heat source heat medium, and the absorption chiller 1 Is sent from the absorption refrigeration machine 1 by installing in the air conditioner 4 a compensation reheating coil 4c that reheats the cooled dehumidified air A using hot water H heated by another heating device 12 as a heat source heat medium. While adopting a configuration in which the cooling dehumidified air A is reheated using the used cooling water W, high functionality can be obtained in terms of adjusting the temperature and humidity of the supply air A to the air-conditioning target area.

  18 is a main bypass path for short-circuiting the used cooling water W in the cooling water return path 8 to the cooling water forward path 7 in a state where the cooling tower 6 is bypassed on the downstream side (cooling tower 6 side) of the bifurcated flow path portions 8a and 8b. , 19 is a bypass flow rate adjusting valve for adjusting the short-circuit flow rate of the used cooling water W through the main bypass passage 18, and the return flow rate of the used cooling water W to the cooling tower 6 by adjusting the short-circuit flow rate by the bypass flow rate adjusting valve 19. Adjust.

  Reference numeral 20 denotes an inlet temperature sensor that detects a cooling water inlet temperature ti, which is the temperature of the cooling water W supplied to the absorption chiller 1, and 21 denotes a main bypass based on the cooling water inlet temperature ti detected by the inlet temperature sensor 20. The coolant temperature controller 21 adjusts the bypass flow rate adjustment valve 19 in the passage 18, and the coolant temperature controller 21 sets the coolant inlet temperature ti based on the coolant inlet temperature ti detected by the inlet temperature sensor 20. The short-circuit flow rate by the main bypass path 18 is adjusted by adjusting the flow rate adjustment valve 19 so as to keep the lower limit inlet temperature tii or more, and thereby, the heat radiation amount of the cooling water W in the cooling tower 6 is excessive due to the low temperature of the outside air. This prevents the cooling water inlet temperature ti from becoming excessively low.

  In short, the cooling water flow controller 10 described in the present embodiment adjusts the output to the cooling water pump Pw with respect to the change in the set temperature range X of the cooling water outlet temperature to detected by the outlet temperature sensor 9. The cooling water supply flow rate q to the heat source device 1 (absorption refrigeration machine) is changed proportionally within the set flow rate range Y, and the absorption refrigeration is performed while the heat source device 1 is an absorption refrigeration machine. When the detection temperature ts of the regenerator in the machine 1 becomes equal to or higher than the set upper limit regeneration temperature tss, the cooling water is given priority over the adjustment of the cooling water supply flow rate q based on the cooling water outlet temperature to detected by the outlet temperature sensor 9. Control means for adjusting the cooling water supply flow rate q to the absorption refrigerator 1 as the heat source device to the set safe flow rate qss by adjusting the output to the pump Pw.

Another embodiment
Next, other embodiments of the present invention will be listed.
Although the example which adjusts the cooling water supply flow rate q with respect to the absorption refrigeration machine 1 was shown in the above-mentioned embodiment, the heat source apparatus made into the adjustment object of the cooling water supply flow rate q is not restricted to an absorption refrigeration machine, Absorption-type cold temperature Any water-cooled type such as a water generator or a turbo refrigerator may be used.

  In the above-described embodiment, the temperature-proportional cooling water supply flow rate q is adjusted by changing the cooling water supply flow rate q within the set flow rate range Y with respect to the change in the set temperature range X of the cooling water outlet temperature to. However, while the set temperature range X is set to 32 ° C. to 37 ° C. and the set flow rate range Y is set to 50% flow rate to 100% flow rate of the maximum water supply amount qmax, the set temperature range X and the set flow rate range are shown. The specific upper and lower limit values of each Y are not limited to this, and may be determined according to various conditions such as the type of the target heat source device.

  In the above-described embodiment, the proportional proportional relationship K between the cooling water outlet temperature to and the cooling water supply flow rate q is proportional to the cooling water supply flow rate q changing at a constant change rate with respect to the change of the cooling water outlet temperature to. Although an example of adopting the relationship has been shown, instead of this, cooling is performed according to a set proportional relationship in which the cooling water supply flow rate q is changed at a somewhat different rate of change between the upper limit side and the lower limit side of the range with respect to the change of the cooling water outlet temperature to. The water supply flow rate q may be changed.

  In the above-described embodiment, the exhaust heat reheat unit 4b (exhaust heat reheat coil) that reheats the cooled dehumidified air A using the used cooling water W delivered from the heat source device 1 (absorption refrigerator) as a heat source. And the compensation reheating unit 4c (compensation reheating coil) for reheating the cooled dehumidified air A using the heating medium H heated by another heating device 12 as a heat source is compensated for. Although the example which uses warm water as the heat source heat medium H in the reheating part 4c for heat | fever was shown, the heat source heat medium H in the reheating part 4c for compensation is not restricted to warm water, A vapor | steam etc. may be sufficient. The compensation reheating unit 4c may be an electrothermal type.

  The present invention can be applied to adjustment of the cooling water supply flow rate for various water-cooled heat source devices used in various fields.

The figure which shows the system configuration of the cooling water system in the air conditioning equipment A graph showing the proportional relationship between the cooling water outlet temperature and the cooling water supply flow rate Diagram showing a conventional cooling water system

1 Heat source device, absorption chiller W Cooling water Pw Cooling water pump to Cooling water outlet temperature 9 Outlet temperature sensor, operation state detection means q Cooling water supply flow 10 Control means X Set temperature range Y Set flow range ts Regenerator detection Temperature tss Set upper limit regeneration temperature qss Set safe flow rate A Air 4 Air conditioner 4b Waste heat reheating part 12 Heating device H Heating medium 4c Reheating part for compensation
K setting proportional relationship
17 Reheat controller

Claims (5)

A cooling water pump that supplies cooling water to the water-cooled heat source device, an outlet temperature sensor that detects a cooling water outlet temperature that is a temperature of used cooling water sent from the heat source device, and an outlet temperature sensor that detects the cooling water outlet temperature. The control means for adjusting the cooling water supply flow rate to the heat source device by adjusting the output of the cooling water pump according to the cooling water outlet temperature, and the air supplied to the air-conditioning target area is cooled and dehumidified. With air conditioner that adjusts temperature and humidity by heat,
This air conditioner includes a waste heat utilization reheat unit that performs reheating following cooling and dehumidification of supply air to the air-conditioning target area using the used cooling water sent from the heat source device as a heat source, and is different from the heat source device. The heat medium heated by the heating device is used as a heat source, and a configuration including a reheating portion for compensation that performs reheating following cooling and dehumidification of air supplied to the air-conditioning target area,
The control means sets a cooling water supply flow rate to the heat source device by adjusting an output to the cooling water pump with respect to a change in a set temperature range of the cooling water outlet temperature detected by the outlet temperature sensor. Cooling water system that is configured to change proportionally within. The control means sets a cooling water supply flow rate to the heat source device with respect to a change in the set temperature range of the cooling water outlet temperature detected by the outlet temperature sensor, and a preset cooling water outlet temperature. The cooling water system according to claim 1, wherein the cooling water system is configured to change proportionally within the set flow rate range in accordance with a set proportional relationship with a cooling water supply flow rate . The cooling water system according to claim 2, wherein the set proportional relationship is such that the rate of change of the cooling water supply flow rate with respect to the change of the cooling water outlet temperature is different between an upper limit side and a lower limit side of the set temperature range . When the temperature of the air sent from the air conditioner can be adjusted to the set supply air temperature only by reheating in the exhaust heat reheating part, the heat source is stopped in the state where reheating in the compensation reheating part is stopped. Adjusting the temperature of the air sent from the air conditioner to the set supply air temperature by adjusting the supply flow rate of the used cooling water sent from the device to the exhaust heat reheating part,
In addition, when the temperature of the air sent from the air conditioner cannot be adjusted to the set supply air temperature only by reheating in the exhaust heat utilization reheating unit, the exhaust heat utilization of the used cooling water delivered from the heat source device is not possible. With the supply flow rate to the reheating unit maximized, the temperature of the air sent from the air conditioner is adjusted by adjusting the supply flow rate of the heating medium from the other heating device to the compensation reheating unit. The cooling water system according to any one of claims 1 to 3, wherein a reheat controller for adjusting the set supply air temperature is provided . In contrast to the heat source device being an absorption refrigerator, the control means is detected by the outlet temperature sensor when the detected temperature of the regenerator in the absorption refrigerator is equal to or higher than a set upper limit regeneration temperature. Prior to the adjustment of the cooling water supply flow rate based on the cooling water outlet temperature, the cooling water supply flow rate to the absorption chiller as the heat source device is adjusted to the set safe flow rate by adjusting the output to the cooling water pump. The cooling water system according to any one of claims 1 to 4 .

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