JP3411098B2 - Air conditioning equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling / heating facility capable of performing either or both cooling and heating, and more specifically, a cooling / heating machine (in this specification, an absorption refrigerator or the like is used for cooling). , Heating refers to a broad concept that means a heat pump, etc., and a heat storage device (in this specification, a facility for storing heat in advance when electricity is cheap at night, etc., and for cooling, an ice heat storage device, etc. And heating means a hot water heat storage device and the like).

[0002]

2. Description of the Related Art Conventionally, as an air conditioning equipment used for district heating and cooling, in addition to an ordinary cooling and heating machine, a medium cooled or heated by using midnight power or the like is used in the daytime (usually It is known to include a heat storage device that performs heating and cooling during the 22:00 time period. Since the running cost required for cooling and heating can be reduced by providing a heat storage device that uses late-night power, the number of cooling and heating facilities of this type has increased in recent years.

In this type of cooling and heating equipment, the heat storage amount of the heat storage device is used for the base load, and the heat amount of the cold / hot water machine is used as the variable load (also called "peak load"). Here, the "base load" is shown in FIG.
As shown in Figure 1, the load heat quantity used as a basic heat source is assigned in advance for each unit time as shown by Q1 for the desired load heat quantity Q. Similarly, the "variable load" is the desired load heat quantity Q. Is the load heat quantity used to share the difference between the desired load heat quantity Q and the base load Q1 in each unit time, as indicated by Q2.

Further, in Japanese Patent Laid-Open No. 4-158137, as shown in FIG. 6, the heat quantity of one or more chiller-heaters is assigned to a portion inscribed in the load curve a as a base load, and a plurality of heat storage devices are provided. A heating and cooling facility is disclosed in which a variable load is assigned to a portion circumscribing the load curve a. In this cooling / heating equipment, desired cooling / heating is performed by controlling the number of heat storage devices and cooling / heating machines with respect to the expected load curve a.

In any of the above-mentioned cooling and heating facilities, in order to increase and decrease the number of operating units by performing on / off control of the chiller / hot water generator or the heat storage device operated at the rated flow rate with respect to the continuously varying cooling / heating load. The flow rate of the cooling / heating medium supplied to the cooling / heating load equipment installed in a building or the like suddenly increases or decreases. To respond to such rapid changes in flow rate,
Usually, a bypass line for the cooling / heating medium is provided between the supply line and the returning line for the cooling / heating medium.

FIG. 7 is a conceptual diagram of a conventional cooling and heating facility provided with such a bypass line.

In this cooling / heating equipment, the cooling / heating medium supplied from the cooling / heating machine 42 and the heat storage device 43 performing the rated operation is supplied to the cooling / heating load equipment 40 via the supply line 4 and again cooled / hot water via the return line 14. Machine 42 and heat storage device 4
Returned to 3. A bypass line 6 is provided between the supply line 4 and the return line 14, and the bypass line 6 is provided with a flow rate adjusting valve 5. A pressure sensor 18 and a pressure regulator 8 are provided upstream of the bypass line 6 of the supply line 4. In this type of air conditioning equipment,
In an ideal operating condition, the temperature and pressure of the cooling / heating medium supplied to the cooling / heating load facility 40 are substantially constant, and the amount of heat received / supplied to the cooling / heating load facility 40 is adjusted by controlling the flow rate of the cooling / heating medium. ing. The flow rate of the cooling / heating medium supplied to the cooling / heating load facility 40 is adjusted by the pressure regulator 8 based on the pressure in the supply line 4 detected by the pressure sensor 18 and the flow regulating valve 5 in the bypass line 6.
Is adjusted to increase or decrease the bypass amount of the cooling / heating medium.

As described above, the bypass line 6 bypasses the excess cold heat medium supplied from the cold / hot water generator 42 or the heat storage device 43, so that the cold / hot water medium by starting and stopping the cold / hot water generator 42 or the heat storage device 43 is removed. It acts as a buffer against sudden changes in the flow rate, but the cooling and heating load equipment 4
The cooling medium of a certain amount or more is always bypassed so that the buffering action against a sudden load change at 0 can be fulfilled.

[0009]

In the above-described cooling / heating equipment, the cooling / heating machine 42 and the heat storage device 43 are provided with the cooling / heating medium returned from the cooling / heating load equipment 40 and the cooling / heating medium bypassed from the bypass line 6. I am returning. When the flow rate of the cooling / heating medium supplied by starting and stopping the chiller / heater 42 or the heat storage device 43 suddenly increases / decreases, the flow rate of the cooling / heating medium bypassed from the bypass line 6 without passing through the cooling / heating load facility 40 as described above. Since the temperature increases or decreases, the temperature of the cold heat medium supplied to the cold / hot water generator 42 and the heat storage device 43 changes rapidly. In the cold / hot water generator 42 and the heat storage device 43 which are operated at the rated flow rate, the cold / hot water generator 4 and the heat storage device 43 are operated according to the temperature fluctuations of the cold / heat medium supplied to the cold / hot water device 42 and the heat storage device 43.
2, the cooling / heating capacity is controlled inside the cold / hot water machine 42 and the heat storage device 43 so that the cold heat medium sent from the heat storage device 43 and the heat storage device 43 reaches the set temperature. The heat storage device 43 responds quickly to this temperature change, while the chiller-heater 42 responds slowly to this temperature change, so there is a sudden change in the temperature of the cooling medium supplied to the chiller-heater 42. Then, the change cannot be followed, and the temperature of the cooling / heating medium sent from the cooling / heating machine 42 fluctuates. When the temperature of the cooling / heating medium from the cooling / heating machine 42 changes, the temperature of the cooling / heating medium supplied to the cooling / heating load facility 40 also changes.

That is, in the above-described cooling / heating equipment, the cold / hot water machine 42 and the heat storage device 43 are changed by increasing / decreasing the flow rate of the cold / heat medium by starting and stopping the cold / hot water machine 42 or the heat storage device 43.
When the temperature of the cooling / heating medium supplied to the
2 and the temperature of the cooling / heating medium sent from the heat storage device 43 also change, so that proper cooling / heating is not finally performed in a building or the like equipped with the cooling / heating load facility 40.

Further, since the temperature of the cooling / heating medium returning to the cooling / heating machine 42 and the heat storage device 43 fluctuates greatly when the cooling / heating equipment is actually operated, the response of the temperature of the cooling / heating machine 42 to the external disturbance is also affected. In addition, cooling and heating load equipment 4
The temperature change of the cooling medium supplied to 0 becomes large. In addition, such a cooling / heating facility may be operated based on the cooling / heating load prediction, but even if the load prediction is deviated, the cooling / heating machine 42 is started at the predicted time, so that the cooling / heating medium is further increased. Is excessively or insufficiently supplied, and a large temperature change occurs in the cooling / heating medium supplied to the cooling / heating load facility 40.

The present invention solves the problems of the conventional cooling and heating equipment, and an object of the present invention is to supply a cooling and heating medium having a constant temperature to a cooling and heating load equipment provided in a building or the like. It is to provide air conditioning equipment.

[0013]

The cooling and heating equipment of the present invention comprises:
While circulating the cooling / heating medium to the cooling / heating load facility via a supply line and a return line, from a cooling / heating machine with a fixed delivery amount of one or more cooling / heating medium that is turned on / off in accordance with increase / decrease in load of the cooling / heating load facility. A cooling / heating equipment for controlling a received heat amount to the cooling / heating load equipment by bypassing a predetermined amount of the cooling / heating medium to a bypass line that short-circuits between the supply line and the return line, and a delivery amount of the cooling / heating medium Is provided with one or a plurality of variable heat storage devices.

In the cooling and heating equipment of the present invention, one or a plurality of cooling and heating media, which are turned on and off according to the increase or decrease of the load of the cooling and heating load equipment, are delivered from a chiller / heater with a fixed delivery amount through a supply line and a return line. The cooling / heating medium is circulated to the cooling / heating load facility, and a predetermined amount of the cooling / heating medium is bypassed to a bypass line that short-circuits the supply line and the return line to control the amount of heat received / heated to the cooling / heating load facility. Air conditioning equipment, (a) at least one heat storage device having a flow rate adjusting means for adjusting the delivery amount of the cooling and heating medium, and (b) being installed downstream of the bypass line in the return line, the bypass line And a return temperature sensor for measuring the temperature of the cooling / heating medium returned from the cooling / heating load facility to the cooling / heating machine and the heat storage device, and (c) The temperature of the cold heat medium in the supply line is controlled by controlling the flow rate adjusting means according to the temperature measured by the return temperature sensor to adjust the amount of the cold heat medium sent from the heat storage device. And a flow rate control means for performing control so as to keep the flow rate constant.

Further, the cooling / heating equipment of the present invention is provided from a cooling / heating machine having a fixed delivery amount of one or a plurality of cooling / heating media, which is turned on / off according to the increase / decrease in load of the cooling / heating load equipment, via a supply line and a return line. The cooling / heating medium is circulated through the cooling / heating load facility, and a bypass line that short-circuits the supply line and the return line is bypassed with a predetermined amount of the cooling / heating medium to control the amount of heat received / heated to the cooling / heating load facility. An air-conditioning facility, comprising: (a) a flow rate sensor for measuring a flow rate F _ARi of a cooling / heating medium provided in each of the cooling / heating machines, and (b) at least one flow rate adjusting means for adjusting a delivery amount of the cooling / heating medium. Heat storage device of (c)
A supply temperature sensor for measuring the temperature T _P of the cooling / heating medium supplied from the cooling / heating machine and the heat storage device to the cooling / heating load facility; and (d) installed on the downstream side of the bypass line of the supply line, a supply flow rate sensor for measuring the flow rate F _L of the cold medium supplied to the heating and cooling load facility, (e) the being installed upstream of the bypass line of the return line, the chilling medium, which is returned from the cooling and heating load facility A return temperature sensor for measuring the temperature T _L of
(F) total .SIGMA.F _ARi flow F _ARi of the flow sensor in said measured in the chilling medium in the chiller, the temperature T _P, the temperature T _L, the flow rate F _L, and the bypass line and Using the set value T _R ′ of the temperature T _R of the cooling / heating medium returned from the cooling / heating load facility to the cooling / heating machine and the heat storage device, the flow rate F _IC is calculated from the following equation:

[0016]

[Equation 1]

By controlling the flow rate adjusting means so that the flow rate of the cold heat medium in the heat storage device becomes the flow rate F _IC , the temperature of the cold heat medium in the supply line is controlled to be kept constant. And a flow rate control means for performing.

Further, in the above structure, a feedback temperature sensor for measuring the temperature T _{R of the} cooling / heating medium returned from the bypass line and the cooling / heating load facility to the cooling / heating machine and the heat storage device is further provided, and the flow rate is instead of the control unit, (g) the flow sensor in said measured in the chilling medium in the chiller flow rate F _ARi total .SIGMA.F _ARi, the temperature T _P, the temperature T _L, the flow rate F _L , And the set value T _R 'of the temperature T _R are used to obtain the flow rate F _IC from the following equation,

[0019]

[Equation 2]

[0020] By adjusting the flow rate adjusting means based on said temperature T _R of the chilling medium is fed back to the flow rate F _IC and the chiller and the heat storage device, the in the chilling medium in the supply line In addition, in any of the above-mentioned configurations, at least one device of the chiller / heater is replaced by a cooling medium for cooling / heating medium, which is provided with a flow rate control means for controlling so as to keep the temperature constant. It may be configured to include a heat storage device whose delivery amount is fixed.

[0021]

According to the present invention, a cooling / heating machine having a fixed delivery amount of the cooling / heating medium that is turned on / off according to the increase / decrease of the load of the cooling / heating load facility is provided, and the received / heat amount of the cooling / heating load facility is bypassed to the bypass line. It is applied to cooling and heating equipment that is controlled by adjusting the flow rate. The cooling and heating equipment of the present invention has a slow response to the cooling and heating load fluctuation of the cooling and heating capacity of the chiller-heater, and temperature control is difficult, whereas the cooling and heating capacity of the heat storage device that stores heat using night-time power is the cooling and heating load. This is done by paying attention to the fact that the response to fluctuations is quick, the temperature control is easy, and the delivery amount of the cooling / heating medium can be changed in a wide range.

In the cooling and heating equipment according to the first aspect of the present invention, the hot and cold water machine having a fixed delivery amount of the cooling and heating medium is used for the rough control of the amount of heat received and supplied to the cooling and heating load equipment, and the delivery amount of the cooling and heating medium is variable. The equipment is used for fine adjustment of the amount of heat received and supplied to the cooling and heating load equipment.

By providing the heat storage device in which the delivery amount of the cooling / heating medium is variable, it is possible to easily adjust the cooling / heating capacity in the cooling / heating load facility.

In the cooling / heating equipment according to the second aspect of the present invention, if the temperature of the cooling / heating medium returned to each cooling / heating machine operating at the rated flow rate is constant, the response of the cooling / heating machine to the cooling / heating load fluctuation is slow. This is because the influence of the above is eliminated, and the temperature of the cooling / heating medium sent from each cooling / heating machine is also constant. In this cooling / heating equipment, the temperature of the cooling / heating medium returned to the cooling / heating machine and the heat storage device is measured by the feedback temperature sensor, and the flow rate control unit controls the flow rate adjusting unit in response to this to measure the temperature of the cooling / heating medium sent from the storage device. Increase or decrease the flow rate.

Specifically, in the cooling equipment, if the temperature of the cold heat medium returned to the cold / hot water generator and the heat storage device is higher than a predetermined value, the flow rate of the cold heat medium sent from the heat storage device is increased. If the temperature of the cold heat medium returned to the cold / hot water generator and the heat storage device is lower than the predetermined value, the flow rate of the cold heat medium sent from the heat storage device is reduced. In the heating facility, if the temperature of the cold heat medium returning to the cold / hot water generator and the heat storage device is higher than a predetermined value, the flow rate of the cold heat medium sent from the heat storage device is reduced. Further, if the temperature of the cold heat medium returned to the cold / hot water machine and the heat storage device is lower than the predetermined value, the flow rate of the cold heat medium discharged from the heat storage device is increased. The bypass line increases / decreases the bypass amount according to the increase / decrease in the flow rate of the cold heat medium sent from the heat storage device in order to suppress the pressure fluctuation of the cold heat medium caused by the increase / decrease in the flow rate of the cold heat medium sent out from the heat storage device. That is, the flow rate of the cooling / heating medium in the bypass line joining the cooling / heating medium returning from the cooling / heating load facility is returned to the cooling / heating machine and the heat storage device in accordance with the fluctuation of the temperature of the cooling / heating medium returning to the cooling / heater and the heat storage device. It is increased or decreased so as to cancel the fluctuation of the temperature of the cooling / heating medium. By repeating this operation, the temperature of the cooling / heating medium returned to the cooling / heating machine and the heat storage device is controlled to a predetermined value, and the temperature of the cooling / heating medium finally supplied to the cooling / heating load facility can be controlled to be constant.

In the cooling and heating equipment according to the invention of claim 3, the flow rate of the cooling and heating medium in the cooling and heating load equipment, the temperature of the cooling and heating medium at the inlet and the outlet of the cooling and heating load equipment, and the return to the hot and cold water storage device and the heat storage device. Based on the set temperature value, find the total flow rate of the cooling / heating medium to be sent from the cold / hot water storage device and the heat storage device in order to keep the temperature returned to the cold / hot water storage device and the heat storage device constant. By subtracting the flow rate of the medium, the flow rate of the cold heat medium in the heat storage device is obtained. Specifically, the flow rate F _ARi of the cooling / heating medium in each cooling / heating machine is measured by a flow sensor, and the temperature T _{P of the} cooling / heating medium supplied to the cooling / heating load facility from the cooling / heating machine and the heat storage device (the cooling / heating load facility inlet temperature) is measured by the supply temperature sensor, the flow rate F _L of cold medium supplied to the cooling and heating load facilities is measured at a feed flow sensor further temperature T _L (heating and cooling load facility for chilling medium returned from Air load facility Outlet temperature) is measured by the return temperature sensor. The set value of the temperature T _R of the cold heat medium returned to the cold / hot water generator and the heat storage device is represented by T _R ′.

The flow rate control means _determines the sum ΣF of the flow rates F ARi.
_ARi, the temperature T _P, T _L, and T set value of _R T _R ', and obtains the flow rate F _IC from the following equation using the flow F _L.

[0028]

[Equation 3]

Next, the flow rate control means adjusts the flow rate adjusting means provided in the heat storage device so that the flow rate of the cold heat medium in the heat storage device becomes the flow rate F _IC obtained above. By adjusting the flow rate adjusting means in this way, the temperature of the cooling / heating medium returned to the cooling / heating machine and the heat storage device is controlled to a predetermined value, and the temperature of the cooling / heating medium finally supplied to the cooling / heating load equipment is made constant. Can be controlled.

In the cooling and heating equipment according to the fourth aspect of the present invention, the flow rate control means includes the flow rate F _IC obtained above and a feedback temperature sensor for measuring the temperature of the cooling and heating medium returned to the chiller / hot water generator and the heat storage device. The flow rate of the cold heat medium in the heat storage device is controlled based on the measured temperature T _R. By adding the flow rate control based on the temperature T _R , it is possible to eliminate the offset (steady deviation) of the temperature of the feedback cooling / heating medium that occurs when the control is performed only by the flow rate F _IC .

In the above structure, at least one device of the cold / hot water machine may be a heat storage device having a fixed delivery amount of the cooling / heating medium which is operated at a rated temperature. According to this configuration, the number of heat storage devices can be increased,
It is possible to obtain an air conditioning system that can effectively use nighttime electric power.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The cooling and heating equipment of the present invention will be described based on embodiments with reference to the drawings. In the following examples, the case where the present invention is applied to cooling equipment will be described, but the present invention is not limited to the following examples, and is applied to cooling and heating equipment for performing either or both cooling and heating. can do.

FIG. 1 shows a schematic configuration of the cooling equipment according to the first embodiment of the present invention. This cooling equipment includes a plurality of absorption refrigerators 1, 1 ... And two ice heat storage devices 2, 3.
The absorption refrigerator 1 and the ice heat storage device 2 are used with a fixed amount of circulating water, which is a cooling / heating medium, so as to exert a constant cooling capacity. In the present embodiment, the absorption refrigerator 1 and the ice heat storage device 2 correspond to a cold / hot water machine, and the ice heat storage device 3 corresponds to a heat storage device. The ice heat storage device 3 is provided with a flow rate adjusting valve 11 for adjusting the flow rate of the circulating water, and the amount of circulating water delivered in the ice heat storing device 3 is the flow rate adjusting valve 1 according to the set value of the flow rate controller 12.
Adjusted by 1. In the present embodiment, as shown in FIG. 6, the base load in which the heat amounts of the absorption refrigerator 1 and the ice heat storage device 2 are inscribed in the load curve a with respect to the predicted load curve a of the day obtained from meteorological data or the like. Assigned as. The heat quantity of the ice heat storage device 3 is assigned as a variable load.

A supply line 4 for supplying circulating water to the cooling load equipment 10 and a return line 14 for returning circulating water from the cooling load equipment 10 are connected to the absorption refrigerator 1 and the ice heat storage devices 2, 3. A bypass line 6 is provided between the supply line 4 and the return line 14, and a flow rate adjusting valve 5 is provided on the bypass line 6. A pressure sensor 18 is provided on the upstream side of the bypass line 6 of the supply line 4, and a pressure controller 8 is connected to the pressure sensor 18. The pressure controller 8 controls opening / closing of the flow rate adjusting valve 5.

Further, the bypass line 6 of the return line 14
A feedback temperature sensor 19 is provided on the further downstream side, and the feedback temperature sensor 19 is connected to a temperature controller 9 that functions as a flow rate control means. The set value of the flow rate controller 12 for adjusting the flow rate of the ice heat storage device 3 is set by the temperature controller 9 based on the temperature measured by the feedback temperature sensor 19. In this embodiment, the flow rate controller 12 and the temperature controller 9 function as flow rate control means. In this example,
Although the configuration in which the flow rate adjusting valve 11 is cascade-controlled by the flow rate controller 12 and the temperature controller 9 is adopted, the flow rate adjusting valve 11 may be directly controlled by the temperature controller 9. Further, in this embodiment, the flow rate adjusting valve 11 is used to adjust the flow rate of the circulating water of the ice heat storage device 3, but a pump using an inverter motor may be used as the pump of the ice heat storage device 3.

In this embodiment, the absorption refrigerator 1 and the ice heat storage device 2 are provided with flow rate controllers 15, 15 ... And these flow rate controllers 15 are provided in the absorption refrigerator 1 and the ice heat storage device 2. The flow rate control valve 13 is controlled so that the amount of circulating water delivered becomes the rated flow rate. Therefore, the flow rate adjusting valve 13 and the flow rate adjusting meter 15 are used for the individual absorption refrigerator 1 and the ice heat storage device 2.
It does not have a function to change the amount of circulating water delivered.

The cooling equipment of the present embodiment having the above construction is operated according to the predicted load curve a of the day as shown in FIG. Steady state, that is, a predetermined number of absorption refrigerators 1
And, the ice heat storage device 2 has been operated for some time,
When the temperature of the circulating water supplied to the cooling load equipment 10 is substantially constant, the flow rate of the bypass line 6 does not change abruptly.

From this state, according to the predicted load curve a in FIG. 6, when one of the absorption refrigerators 1 starts or stops its operation under the control of the operating unit number controller 20, a sudden pressure increase or A pressure drop occurs. This pressure fluctuation is detected by the pressure controller 8 via the pressure sensor 18 on the supply line 4, and the pressure controller 8 adjusts the flow rate adjusting valve 5 to increase or decrease the bypass amount of the circulating water in the bypass line 6. ,
The control is performed so that the pressure of the circulating water supplied to the cooling load equipment 10 is kept constant.

When the flow rate of the circulating water bypassed from the bypass line 6 increases or decreases, the temperature of the circulating water returning to the absorption refrigerator 1 and the ice heat storage devices 2 and 3 via the return line 14 also rises and falls. The temperature controller 9 detects the temperature change of the circulating water via the feedback temperature sensor 19 and increases the amount of circulating water sent from the ice heat storage device 3 when the temperature of the circulating water to be returned is high. The flow rate adjustment valve 11 is adjusted via the flow rate controller 12.

Similarly, when the temperature of the circulating water to be returned is low, the flow rate adjusting valve 11 is adjusted so as to reduce the amount of the circulating water sent from the ice heat storage device 3. By thus repeating the circulation of the circulating water while controlling the amount of circulating water delivered from the ice heat storage device 3, the temperature of the circulating water returned to the absorption refrigerator 1 and the ice heat storage devices 2 and 3 is controlled to be constant. As a result, the temperature of the cooling heat medium supplied to the cooling load equipment 10 becomes constant.

The cooling equipment of the embodiment shown in FIG. 1 has the advantage that the temperature of the circulating water can be controlled with a relatively simple structure, but all disturbances are absorbed by the absorption refrigerator 1 and ice. Since the temperature control is not performed until the temperature of the circulating water returned to the heat storage devices 2 and 3 is reflected, there is a certain amount of time until the temperature of the circulating water becomes constant. This point is solved by the cooling equipment shown in the second embodiment below.

FIG. 2 shows the schematic construction of the cooling equipment according to the second embodiment of the present invention. The cooling equipment of this embodiment is different from the cooling equipment of FIG. 1 described above in the following points. That is, in this embodiment, the temperature controller 9 and the feedback temperature sensor 19
In addition, the absorption refrigerator 1 and the ice heat storage device 2 are provided with flow rate sensors 17, 17, ... And the supply flow rate sensor 2 is provided downstream of the bypass line 6 of the supply line 4.
1 and the supply temperature sensor 22 are provided, and the return line 14
Return temperature sensor 23 upstream of the bypass line 6
And a flow rate control device 30 functioning as a flow rate control means. Figure 1
2 has a similar configuration, and corresponding elements are designated by the same reference numerals.

The flow rate sensor 17 described above measures the flow rate F _{ARi of the} circulating water sent from each absorption refrigerator 1 and the ice heat storage device 2, and the supply flow rate sensor 21 measures the flow rate F of the cooling / heating medium supplied to the cooling load equipment. Measure _L. Further, the supply temperature sensor 22 determines the temperature T of the cooling / heating medium supplied to the cooling load facility 10.
_P is measured, and the return temperature sensor 23 measures the temperature T _{L of the} cooling heat medium returned from the cooling load facility. Absorption refrigerator 1
And the set value of the temperature T _R of the cold heat medium returned to the ice heat storage devices 2 and 3 is T _R '.

In the cooling equipment of this embodiment, the flow rate controller 12 provided in the ice heat storage device 3 is controlled by the flow rate control device 30. The flow rate control device 30 determines the temperature of the circulating water returned to the absorption refrigerator 1 and the ice heat storage devices 2 and 3 based on the flow rate _FL , the temperatures T _P and T _L , and the set value T _R ′ of the temperature T _R described above. In order to keep T _R constant, the total flow rate of the circulating water to be delivered from the absorption refrigerator 1 and the ice heat storage devices 2 and 3 is calculated,
The flow rate F _IC of the cold heat medium in the ice heat storage device 3 is obtained by subtracting the flow rate F _ARi of the cold heat medium of the absorption chiller 1 and the ice heat storage device 2 which are now in operation.

Specifically, the flow rate F _IC of the cold heat medium in the ice heat storage device 3 is obtained by the following formula.

[0046]

[Equation 4]

Here, ΣF _ARi is the total flow rate of the circulating water sent from the absorption refrigerator 1 and the ice heat storage device 2. The above formula (1) is obtained as follows. At the junction point A where the bypass line 6 of FIG. 2 merges with the return line 14, the following formula is established. That is,

[0048]

[Equation 5]

Here, F _B and T _B are the bypass lines 6
It is the flow rate and temperature of the circulating water in. Also,

[0050]

[Equation 6]

From equations (2) to (5)

[0052]

[Equation 7]

From equation (6)

[0054]

[Equation 8]

[0055] than (7), to the temperature T _R of the circulating water to be fed back to the absorption refrigerating machine 1 and ice thermal storage device 2 constant, when the set value of the temperature T _R and T _R ', cooling As the flow rate F _{L in} the load equipment 10 increases or decreases, the flow rate F _P becomes ( _TL
It is sufficient to increase / decrease by the ratio of −T _P ) / (T _R '−T _P ). Here, since the delivery amount of the circulating water of the absorption refrigerator 1 and the ice heat storage device 2 is constant, the increase / decrease of the flow rate F _P may be dealt with by changing the delivery amount F _IC of the circulating water of the ice heat storage device 3. . Therefore, the following formula is established.

[0056]

[Equation 9]

By substituting the equation (7) into the equation (8), the above equation (1) can be obtained. Therefore, the flow rate control device 30 sends the circulating water amount F from the ice heat storage device 3 according to the equation (1).
By controlling the flow controller 12 so that the _IC changes, the temperature T _R of the circulating water to be returned can be made constant (set value T _R ′). If the temperature T _R becomes constant, the cooling load equipment 10
The temperature of the circulating water supplied to is also constant.

FIG. 4 shows how the relationship of the equation (8) is established in the actual cooling equipment. In the figure, for the sake of simplicity, the amount of circulating water delivered is fixed to the ice heat storage device 2
Is not considered. In the figure, the vertical axis represents the flow rate of circulating water and the number of operating absorption refrigerators 1, and the horizontal axis represents time.
The broken line L represents the number of operating the absorption refrigerator 1 that is actually started based on the load curve obtained by adding a constant compensating bypass flow rate to the load fluctuation of the cooling load equipment 10 to the predicted load curve a in FIG. , The total circulating water ΣF _ARi actually sent out from the absorption refrigerator 1 is the refrigerator start time Δ from the broken line L.
Appears with a delay of T (about 30 minutes in a normal absorption refrigerator),
The step shape is almost the same as the broken line L. And
To flow F _L of the circulating water to the cooling load facility 10 to increase the flow rate F _IC is supplied from the ice thermal storage apparatus 3 so as to complement the total circulating water .SIGMA.F _ARi step shape. This allows
Flow rate F _P of the circulating water supplied from the absorption refrigerating machine 1 and the ice heat storage device 3 is substantially parallel to the flow rate F _L, the flow rate F _P and the flow rate F _L
The bypass flow rate F _{B, which} is represented as the difference between the two, becomes almost constant. When the bypass flow rate F _B becomes constant, the temperature disturbance to the absorption refrigerator 1 becomes small, and the temperature of the circulating water sent from the absorption refrigerator 1 also becomes constant. In Fig. 4, the flow rate _FL
While the bypass flow F _B with increasing has increased slightly, which is (3) from the equation, to the temperature T _R is constant, the temperature T _L, if the T _B varies, the flow rate F _This is because it is necessary to increase the bypass flow rate F _{B at a} constant rate as the _L increases.

[0059] In the above configuration of Figure 2, in but a temperature T _R of the circulating water to be fed back to the absorption refrigerating machine 1 and ice thermal storage devices 2 and 3 can be made constant, the temperature T _R of the set value T _R ' On the other hand, an offset (steady deviation) may occur. Since the configuration of FIG. 2 does not have a function of directly detecting and compensating for the temperature T _R , this offset cannot be eliminated. This problem is solved by the cooling equipment shown in the third embodiment below.

FIG. 3 shows the schematic construction of the cooling equipment according to the third embodiment of the present invention. The cooling equipment of the present embodiment is obtained by adding the configuration of the cooling equipment of FIG. 1 to the cooling equipment of FIG. 2, and a temperature controller 9 is attached to the return temperature sensor 19 to circulate water in the ice heat storage device 3. The deviation calculator 31 sets the flow rate set value of the flow rate controller 12 for adjusting the delivery amount. Difference between the actual set temperature T _R of the temperature and feedback circulating water return circulation water 'temperature adjusting meter 9, i.e. to calculate the offset value, the deviation calculator 31 is set to the flow rate regulating valve 11 from the flow control device 30 The value is corrected using this offset value. Then, the flow rate control valve 11 is controlled via the flow rate controller 12 based on this correction value.

[0061]

In the cooling / heating equipment of the present invention, the temperature of the cooling / heating medium returning to the cooling / heating machine operating at the rated flow rate becomes constant, so that the temperature disturbance to the cooling / heating machine becomes small. Therefore, the temperature of the cooling / heating medium supplied from the cooling / heating machine to the cooling load equipment installed in a building or the like also becomes constant, and the cooling load equipment can perform stable cooling / heating. Further, since the cooling and heating capacity of the heat storage device has a quick response to the cooling and heating load, it is possible to quickly follow the fluctuation of the load in the cooling load facility. Further, in the cooling / heating equipment that operates based on the cooling / heating load prediction, the prediction accuracy is low, and therefore, even if the start and stop timings of the chiller / heater shift, the heat storage device can perform appropriate cooling / heating.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a cooling facility according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a cooling equipment according to a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a cooling equipment according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a relationship of flow rates in respective parts of the cooling equipment of FIG.

FIG. 5 is a diagram showing distribution of the amount of heat in a conventional cooling / heating facility that uses the amount of heat of a chiller / heater as a variable load and the amount of heat stored in a heat storage device as a base load.

FIG. 6 is a diagram showing distribution of heat quantity in a conventional cooling / heating facility that uses the heat quantity of a heat storage device as a variable load and the heat quantity of a water cooler / heater as a base load.

FIG. 7 is a conceptual diagram of a conventional cooling and heating facility provided with a bypass line.

[Explanation of symbols] 1 ... Absorption refrigerator 2 ... Ice heat storage device 3 ... Ice heat storage device 4 ... Supply line 4 5 ... Flow control valve 6 ... Bypass line 8 ... Pressure controller 9 ... Temperature controller 10 ... Cooling load equipment 11 ... Flow control valve 12 ... Flow controller 14 ... Return line 14 17 ... Flow rate sensor 18 ... Pressure sensor 19 ... Return temperature sensor 20 ... Operating number control device 21 ... Supply flow rate sensor 22 ... Supply temperature sensor 23 ... Return temperature sensor 30 ... Flow control device 31 ... Deviation calculator

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-4-281130 (JP, A) JP-A-4-158137 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 5/00 102 F24F 11/02 102

Claims (5)

(57) [Claims] 1. A heating / cooling load for cooling / heating a cooling / heating machine having a fixed delivery amount of one or a plurality of cooling / heating media that is turned on / off according to a load increase / decrease of the cooling / heating load facility via a supply line and a return line. While circulating in the equipment, by bypassing a predetermined amount of the cooling and heating medium from the supply line to the return line via a bypass line, a cooling and heating facility for controlling the amount of heat received and supplied to the cooling and heating load facility, The heat storage device further comprises one or a plurality of heat storage devices whose delivery amount is variable, and the heat storage device includes the cold / hot water generator and the storage device.
When the temperature of the cooling medium returning to the heat device is high or low
To adjust the delivery amount of the cooling / heating medium according to
Further, the cooling and heating equipment is controlled so that the temperature of the cooling and heating medium returned from the return line and the bypass line to the cooling and heating machine and the heat storage device is kept constant . 2. The cooling and heating load is applied to the cooling and heating medium via a supply line and a return line from a cooling and heating machine having a fixed delivery amount of one or a plurality of cooling and heating mediums which are turned on and off according to the increase and decrease of the load of the cooling and heating load facility. A heating / cooling facility that circulates through the facility and bypasses a predetermined amount of the cooling / heating medium from the supply line to the return line via a bypass line to control the amount of heat received / received to the cooling / heating load facility, wherein: (B) at least one heat storage device having flow rate adjusting means for adjusting the delivery amount of the cooling / heating medium, and (b) being installed downstream of the bypass line of the return line, from the bypass line and the cooling / heating load facility to the cooling / heating machine. And a feedback temperature sensor that measures the temperature of the cold heat medium that returns to the heat storage device, and (c) the temperature measured by the feedback temperature sensor is High case
And controlling the flow rate adjusting means according to the case of low to adjust the delivery amount of the cold heat medium delivered from the heat storage device,
By controlling the temperature of the cooling / heating medium returned from the return line and the bypass line to the cooling / heating machine and the heat storage device to be constant, control is performed to keep the temperature of the cooling / heating medium in the supply line constant. An air-conditioning facility, comprising: a flow rate control means for performing the flow rate control. 3. The cooling / heating load is supplied to the cooling / heating medium from a cooling / heating machine having a fixed delivery amount of one or a plurality of cooling / heating mediums that are turned on / off according to increase / decrease in load of the cooling / heating load facility via a supply line and a return line. A heating / cooling facility that circulates through the facility and bypasses a predetermined amount of the cooling / heating medium from the supply line to the return line via a bypass line to control the amount of heat received / received to the cooling / heating load facility, wherein: Flow rate F of the cooling / heating medium provided in each chiller / heater
A flow rate sensor for measuring _ARi , (b) at least one heat storage device having a flow rate adjusting means for adjusting the delivery amount of the cold heat medium, and (c) supplying from the cold water heater and the heat storage device to the heating and cooling load equipment. A supply temperature sensor for measuring the temperature T _{P of the} cooling / heating medium, and (d) a flow rate F _L of the cooling / heating medium which is installed downstream of the bypass line of the supply line and is supplied to the cooling / heating load facility. A supply flow rate sensor for measurement, (e) a return temperature sensor installed upstream of the bypass line in the return line, for measuring the temperature T _L of the cooling / heating medium returned from the cooling / heating load facility, (f) total .SIGMA.F _ARi flow F _ARi of the flow sensor in said measured in the chilling medium in the chiller, the temperature T _P, the temperature T _L, the flow rate F _L, and the bypass line Flow rate F _IC from the following equation using the set value T _R ′ of the temperature T _R of the cooling / heating medium returned from the cooling and heating load equipment to the cooling / heating machine and the heat storage device, F _IC = (F _L × (T _L −T _P ) / (T _R ′ −T _P )) − ΣF _ARi The flow rate of the cooling / heating medium in the heat storage device is the flow rate F _IC.
By adjusting the flow rate adjusting means so that the temperature of the cold heat medium returned from the return line and the bypass line to the cold / hot water machine and the heat storage device is constant, the cold heat in the supply line is reduced. A cooling and heating facility comprising: a flow rate control unit that controls the temperature of the medium to be kept constant. Wherein further comprising a feedback temperature sensor for measuring the temperature T _R of the bypass line and the cold medium is fed back to the chiller and the heat storage device from the heating and cooling load facility, in place of the flow rate control means, (g) the flow sensor in said measured in the chilling medium in the chiller flow rate F _ARi total .SIGMA.F _ARi, the temperature T _P, the temperature T _L, the flow rate F _L, and the temperature T _R The flow rate F _IC is calculated from the following equation using the set value T _R 'of F _IC = (F _L × (T _L −T _P ) / (T _R ' −T _P )) − ΣF _{ARi The} flow rate F _IC wherein the cold medium is fed back to the chiller and the heat storage device based on the temperature T _R to adjust the flow rate control means, fed back from the return line and the bypass line to the chiller and the heat storage device and By keeping the temperature of the cooling medium constant, Air conditioning and heating according to claim 3, wherein the temperature of the supply line in the chilling medium with a flow control means for controlling so as to keep constant. 5. A plurality of the cold / hot water generators are provided, and instead of at least one device of the cold / hot water heaters, a heat storage device having a fixed delivery amount of the cold heat medium is provided.
The heating and cooling equipment according to any one of 4 to 4.