JPS644029Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for controlling the number of operating air conditioning heat sources for heating, and particularly to a control device for controlling the number of operating heat source devices in accordance with the air conditioning load.

Referring to FIG. 1, in some prior art, the outgoing pipe 7
During the process, the temperature detector 9 detects the medium temperature, and depending on the medium temperature, which heat source device 1, 2, or 3 is selected.
As shown in FIG. 2, it is determined in advance whether the heat source devices 1, 2, and 3 should be operated, and as the load on the air conditioners 4, 5, and 6 increases, the number of operating heat source devices 1, 2, and 3 is increased by the controller 10. are doing. However, each air conditioner 4, 5, 6
Since the range of medium temperature required in I have to let it happen. Therefore, each of the heat source devices 1, 2, and 3 repeatedly starts and stops even if the medium temperature fluctuates slightly, making it difficult to perform stable operation.

Referring again to FIG. 1, in another prior art, a differential pressure control valve 12 as a bypass valve is provided in the middle of a bypass pipe 11, and a controller 13 operates according to the opening degree of the differential pressure control valve 12. This controls the operation tables of the heat source devices 1, 2, and 3. In other words, as the load on the air conditioners 4, 5, 6 increases and the medium flow rate to each air conditioner 4, 5, 6 increases, the opening degree of the differential pressure control valve 12 becomes smaller. The number of machines in operation is increasing.
In this prior art, the flow control valves 14, 15, 16 of each air conditioner 4, 5, 6 are opened and closed, and each heat source device 1,
The differential pressure control valve 12 opens and closes due to pressure fluctuations caused by starting and stopping the two and three pumps 17, 18, and 19. Therefore, each of the heat source devices 1, 2, and 3 repeatedly starts and stops in accordance with the opening and closing operations of the differential pressure control valve 12, making it difficult to perform stable operation as in the prior art described above.

An object of the present invention is to provide a control device that solves the above-mentioned technical problems and enables stable operation by operating an optimal number of heat source devices according to the air conditioning load.

The present invention connects a heating air conditioner and a plurality of heat source devices to form a closed circuit for the medium, and includes a temperature detector for the medium introduced into the air conditioner in the closed circuit, and a temperature sensor before and after the air conditioner. A differential pressure detector is provided to detect the differential pressure of the medium, and a controller is provided to control the start/stop of each heat source device. a first timer that outputs an output when a certain time has elapsed; and a first timer that outputs an output when a state in which the medium temperature detected by the temperature detector continues to be lower than a set temperature range for a first set time or more in a heating state. a second timer; a means for increasing the number of operating heat source devices by a logical product output of the first and second timer; and a state in which the differential pressure detected by the differential pressure detector is equal to or higher than a set pressure; A heating air-conditioning heat source characterized by comprising: a third timer that outputs an output when the duration continues for a second set time or more; and a means for reducing the number of operating heat source devices based on the logical sum output of the first and third timer. This is a device that controls the number of operating units.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a system diagram of an embodiment of the present invention,
Parts corresponding to the prior art shown in FIG. 1 are given the same reference numerals. A plurality of heat source devices 1, 2, 3,
The plurality of air conditioners 4, 5, and 6 are connected by an outgoing pipe 7 and a return pipe 8 to form a closed circuit. Each heat source machine 1,
The medium, such as water, heated or cooled in units 2 and 3 circulates through the closed circuit and is radiated or cooled in each air conditioner 4, 5, 6, thereby achieving cooling or heating. The outgoing pipe 7 and the return pipe 8 are connected via a bypass pipe 11, and a differential pressure control valve 12 is provided in the middle of the bypass pipe 11.
This differential pressure control valve 12 opens and closes so that the differential pressure between the outgoing pipe 7 and the return pipe 8 becomes a predetermined constant value. When the medium flow rate to 6 increases, the opening becomes smaller. In addition, as the heat source machines 1, 2, and 3, an absorption type cold/hot water machine is suitable.

A temperature detector 20 is provided on the outgoing pipe 7. Further, the differential pressure control valve 12 is provided with a differential pressure detector 21 that detects the opening degree of the differential pressure control valve 12, that is, the differential pressure between the outgoing pipe 7 and the return pipe 8. These detectors 2
The detected values of 0 and 21 are respectively input to the controller 22, and the controller 22 controls the start and stop of each heat source device 1, 2, and 3.

The controller 22 (1) determines whether the medium temperature deviates from the set value, (2) calculates the rate of change in the medium temperature over time as δ, and (3) detects the differential pressure detector 2.
Determine whether the differential pressure detected in step 1 is equal to or higher than the set pressure ΔP, and (4) determine whether a predetermined period of time has elapsed after the number of operating heat source devices 1, 2, and 3 changed. , the number of operating heat source devices 1, 2, and 3 is increased or decreased when conditions for changing the number of operating units in the cooling state and heating state, which will be described later, are satisfied. Incidentally, the ratio δ of the medium temperature with respect to the passage of time is calculated by sequentially storing the medium temperature detected by the temperature detector 20 a plurality of times at predetermined time intervals, for example, every 15 seconds, and calculating the arithmetic average.

First, the conditions for increasing the number of operating heat source devices 1, 2, and 3 in the cooling state are as follows.

(1a) A predetermined time T4, for example, 10 minutes, has elapsed since the number of operating heat source devices 1, 2, and 3 was increased or decreased.

(2a) The state in which the medium temperature is higher than the set temperature range continues for the first set time T1, for example, 60 seconds or more.

(3a) The temperature change rate δ is such that the medium temperature does not return to the set temperature range even after a predetermined set time, for example, 15 minutes.

When all of the above conditions (1a), (2a), and (3a) are satisfied, the controller 22 controls the heat source equipment 1, 2,
The number of operating units of 3 will be increased.

The conditions for reducing the number of operating heat source devices 1, 2, and 3 in the cooling state are as follows.

(1b) The second set time T2 is a state in which the differential pressure detected by the differential pressure detector 21 is equal to or higher than the set pressure ΔP.
For example, continue for more than 2 minutes.

(2b) For example, a predetermined time T4 after the number of operating heat source devices 1, 2, and 3 increases or decreases.
After 10 minutes have passed, the state in which the medium temperature is lower than the set temperature range and the rate of change in the medium temperature is negative continues for the third set time T3 or more.

When at least one of the above conditions (1b) and (2b) is satisfied, the controller 22 reduces the number of operating heat source devices 1, 2, and 3.

An example of a change in medium temperature due to a change in the number of operating heat sources in the cooling state will be described with reference to FIG. 4. In Fig. 4, the shaded area is the set temperature range, for example, 5℃ to 8℃ in the cooling state.
selected. At time point P1, when the state in which the medium temperature is equal to or higher than the set temperature range and the rate of temperature change is positive continues for longer than the first set time T1, and moreover time T4 or more has elapsed since the number of operating heat sources changed, the heat source The number of operating units 1, 2, and 3 is increased.
Even after the time T4 has elapsed from this increase point P1 and the first set time T1 has elapsed, the medium temperature remains higher than the set temperature range and the temperature change rate δ
When is positive, the number of operating heat source devices 1, 2, and 3 is further increased at the time point indicated by arrow P2.
Thereby, the medium temperature begins to fall. At time P3, when the state in which the medium temperature becomes lower than the set temperature range and further decreases for more than time T4, and the state in which the rate of change in the medium temperature δ is negative has passed for more than the third set time T3, the heat source device 1 ,2,3
The number of operating machines will be reduced.

At this time, assume that the differential pressure detected by the differential pressure detector 21 becomes equal to or higher than the set pressure ΔP at the time indicated by the arrow P4. At time P5 when the second set time T2 has elapsed in which the differential pressure is equal to or higher than the set pressure ΔP, the number of operating heat source devices 1, 2, and 3 is reduced. When the differential pressure becomes equal to or higher than the set pressure ΔP, the differential pressure control valve 12 opens and the medium is transferred to the outgoing pipe 7.
It is bypassed from there to the return pipe 8 via the bypass pipe 11. Even though the amount of bypass from the outgoing pipe 7 to the return pipe 8 has increased, if the state in which the differential pressure is equal to or higher than the set pressure ΔP continues for more than the second set time T2, at the time point indicated by the arrow P6. , the number of operating heat source devices 1, 2, and 3 is further reduced. When the differential pressure becomes below the set pressure ΔP and the medium temperature rises to exceed the set temperature range, at a time point P7 when the state of being above the set temperature range continues for more than the first set time T1, the heat source equipment 1, The number of operating units of 2 and 3 will be increased.

In this way, the heat source device 1 in the cooling state,
The number of operating air conditioners 2 and 3 is appropriately adjusted by the controller 22 according to the load of the air conditioners 4, 5, and 6, and the number of operating units is increased or decreased at predetermined time intervals, so that stable operation is achieved. be able to.

Next, the conditions for increasing or decreasing the number of operating heat source devices 1, 2, and 3 in the heating state are as follows.

(1c) A predetermined time T5, for example, 5 minutes, has elapsed since the number of operating heat source devices 1, 2, and 3 was increased or decreased.

(2c) The state in which the medium temperature is lower than the set temperature range continues for the first set time T1 or more.

When all of the conditions (1c) and (2c) above are satisfied, the number of operating heat source devices 1, 2, and 3 is increased by the controller 22.

Further, the conditions for reducing the number of operating heat source devices 1, 2, and 3 in the heating state are as follows.

(1d) The second set time T2 is a state in which the differential pressure detected by the differential pressure detector 21 is equal to or higher than the set pressure ΔP.
Continue above.

(2d) A predetermined time T5 has elapsed since the number of operating heat source devices 1, 2, and 3 increased or decreased, and the state in which the medium temperature is higher than the set temperature range continues for more than the first set time T1. .

When at least one of the above conditions (1d) and (2d) is satisfied, the number of operating heat source devices 1, 2, and 3 is reduced by the controller 22.

An example of a change in medium temperature due to a change in the number of operating heat sources in a heating state will be described with reference to FIG. 5. The shaded area in Figure 5 is the set temperature range, for example 47℃ to 60℃ in heating condition.
selected. Assume that the differential pressure of the differential pressure detector 21 becomes larger than the set pressure ΔP at time Q1 when the medium temperature is lower than the set temperature range. In this case, the number of operating heat source devices 1, 2, and 3 is reduced at time Q2 when the second set time T2 has elapsed. If the medium temperature does not reach the set temperature range even after the first set time T1 has elapsed from the time point Q2 when the number of operating units is reduced, the heat source devices 1, 2,
The number of operating units of 3 will be increased. If the medium temperature continues even after the first set time T1 and time T5 have passed due to this increase in the number of operating units, then the arrow Q4
At the point in time indicated by , the number of operating machines is further increased.

When the medium temperature becomes higher than the set temperature range, the heat source devices 1, 2,
The number of operating units of 3 will be increased. However, in this case, it is necessary that time T5 has elapsed from the time point indicated by arrow Q4.

In this way, the heat source device 1 in the heating state,
The number of operating air conditioners 2 and 3 is appropriately adjusted by the controller 22 according to the load of the air conditioners 4, 5, and 6, and the number of operating units is increased or decreased at predetermined time intervals, so that stable operation is achieved. be able to.

As described above, according to the present invention, the number of operating heat source devices can be appropriately adjusted according to the air conditioning load by detecting the medium temperature and the differential pressure before and after the air conditioner.
Moreover, since the number of operating heat source devices is increased or decreased at predetermined time intervals, stable operation can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the prior art, Fig. 2 is a diagram for explaining the control of the prior art, Fig. 3 is a system diagram of an embodiment of the present invention, and Fig. 4 shows the temperature of the medium in the cooling state. FIG. 5 is a diagram showing an example of a change in medium temperature in a heating state. 1, 2, 3... Heat source machine, 4, 5, 6... Air conditioner, 20... Temperature detector, 21... Differential pressure detector,
22...Controller.

Claims (1)

[Claims for Utility Model Registration] A heating air conditioner and a plurality of heat source devices are connected to form a closed medium circuit, and within the closed circuit there is a temperature detector for the medium introduced into the air conditioner, and a temperature sensor for the medium introduced into the air conditioner. A differential pressure detector is provided to detect the differential pressure of the medium before and after the air conditioner, and a controller is provided to control starting and stopping of each heat source device, and this controller increases or decreases the number of operating heat source devices. a first timer that outputs an output when a predetermined period of time has elapsed since the heating condition; a second timer that outputs an output when the first and second timer outputs a logical product output to increase the number of operating heat source devices; and a differential pressure detected by the differential pressure detector when the differential pressure is higher than the set pressure and a means for reducing the number of operating heat source devices based on the logical sum output of the first and third timing means. Device for controlling the number of operating air conditioning heat sources for heating.