JPH0676854B2 - Load reset value setting method in VAV control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention controls the amount of supply air blown into a controlled room according to the load status of the controlled room, while the load status of the controlled room is predetermined. If an unsatisfactory state that exceeds the reset deviation is encountered, the capacity of the air supply air temperature from the air conditioner is increased stepwise for each predetermined capacity increase range, and the load condition that falls into the unsatisfactory state is within the load reset deviation. The present invention relates to a method for setting a load reset value in a VAV control system that returns to the above.

[Prior Art] Conventionally, in a large-scale building, when air supply is supplied from an air conditioner to each part via an air supply duct, it is variable for each air supply outlet of each air conditioning target part (controlled room). An air supply amount adjusting unit (hereinafter referred to as a VAV unit) is provided, and the damper opening of this VAV unit is controlled according to the room temperature of the controlled room, while the air supply blowout amount for each controlled room is adjusted. Even if there is only one controlled room load condition, the damper opening of that VAV unit is MAX.
If the value exceeds the load reset deviation despite the value, the capacity of the supply air temperature from the air conditioner is increased stepwise for each predetermined capacity increase range, and the unsatisfied state is reached. The fallen load condition is returned to within the load reset deviation. Generally, such an increase in the capacity of the outlet air supply temperature is called load reset,
The capacity increase range at that time is defined as the load reset value.

[Problems to be Solved by the Invention]

However, according to such a conventional VAV control system, the load reset value is set to, for example, 0 regardless of the air conditioning conditions.
Since it is uniformly set as 5 degrees Celsius, there are cases where load reset based on a demand to increase cooling (heating) capacity occurs during heating (cooling) and load reset based on a demand to increase heating (cooling) capacity during heating (cooling). In such a case, the time required to secure the capacity increase of the capacity increase range determined as the load reset value is different. That is, when the load reset based on the heating (cooling) capacity increase request is applied during heating (cooling), the required time is short and the heating (cooling)
If the load is reset during the cooling (heating) capacity request, the required time becomes longer.

Therefore, if a load reset based on a cooling (heating) capacity increase request is applied during heating (cooling), it takes a long time to return the load condition that falls into the unsatisfactory state to within the load reset deviation, and the load condition is not satisfied. The problem occurs that the condition is not resolved for a long time. In order to eliminate this problem, if the load reset value is uniformly increased to 1.0 ° C, for example, if the load reset based on the heating (cooling) increasing capacity request is applied during heating (cooling), the blown air supply temperature will be increased rapidly. Since the capacity of the controlled room is increased, the load condition of the controlled room may be returned too much within the load reset deviation, which may cause the damper of the VAV unit to hunt.

[Means for Solving the Problems]

The present invention has been made to solve such a problem, and in the above-described VAV control system, when the load reset based on the cooling capacity increase request is applied during heating, the load based on the heating capacity increase request is applied during heating. While making the load reset value larger than when resetting, when applying the load reset based on the heating capacity increase request during cooling, it is necessary to set the load reset value more than when applying the load reset based on the cooling capacity increase request during cooling. It was made larger.

[Action]

Therefore, according to the present invention, when the heating (cooling) capacity request is made during heating (cooling), the cooling (heating) capacity is increased during heating (cooling) without rapidly increasing the capacity of the blown air supply temperature. It becomes possible to promptly improve the capability of the blown supply air temperature when making a request.

〔Example〕

Hereinafter, the load reset value setting method in the VAV control system according to the present invention will be described in detail.

FIG. 2 is an instrumentation diagram of a VAV control system to which an embodiment of this load reset value setting method is applied.

In the figure, reference numeral 1 denotes an air conditioner, which is a cooling coil C / C to which cold water CW is supplied via an electric valve 2 and hot water via an electric valve 3.
It is composed of a heating coil H / C to which HW is supplied and a fan F. The operation of the air conditioner 1, the electric valve 2 and the electric valve 3 is controlled by the control device 4,
Air conditioner supply air that is blown out from the fan F at 1 (blowing air supply) is the control chamber 6 _-1 to 6 through the air supply duct 5 _- n
Is being supplied to.

The control chamber 6 _-1 to 6 _- Temperature sensor T _-1 through T to n detects the room temperature for each chambers _- n are provided, the temperature sensor T _-1 through T _- n
The detection force of is applied to each of the local regulators 7 _{-1 to} 7 _- n. Then, the controller 7 _-1 to _7-- n is an indoor set given to each individual temperature and the temperature sensor T _-1 through T _- n detection s opening with a deviation between the measured temperature based on the power calculation (PID operation) was carried out, branches from the air supply duct 5 each controlled chamber 6 _-1 6 _- inserted in the air outlet for each of n arranged VAV unit 8 _-1 to 8 _- n gives the calculation result of the navel, the calculation result Based on VAV unit 8 _-1
The damper opening of ~ 8 _- n is controlled to match the room temperature with the room set temperature.

Furthermore, controller 7 _-1 to _7-- n is, VAV unit 8 _-1 to 8 _- n of the damper opening despite the MAX value (D1 points shown in FIG. 3), and the indoor set temperature temperature sensor T _-1 through T _- if the deviation between the measured temperature based on the detection Todoroki of n exceeds a predetermined value, i.e. the measured temperature exceeds a load reset deviation θ2 is set to the indoor set temperature θ1 Controlled room 6 _-1
Assuming that the room temperature of ~ 6 _-1 has fallen into an unsatisfactory state, a load reset command (a request for increasing heating capacity or a request for increasing cooling capacity) is sent to the control device 4 via the transmission line L, in order to increase the capacity of the outlet air supply temperature. It is something to give to.

On the other hand, via the VAV unit 8 _-1 to 8 _- n, the controlled room 6 _{-1 to} 6 _- n
The air supplied to the controlled room is from 6 _{-1 to} 6 _- n.
After contributing to the air conditioning control in, the exhaust air is discharged through the return air duct 9 and the exhaust air adjustment damper 10, but a part of the exhaust air is returned to the air conditioner 1 as return air through the return air adjustment damper 11. Has become. Then, with respect to the return air returned to the air conditioner 1, the outside air is taken in at a predetermined ratio via the outside air adjusting damper 12.

In the supply air from the air conditioner 1, the controlled room 6 _{-1 to} 6 _- n
Blowing air supply that does not contribute to the supply air outlet to through the drain unit (not shown) outside air or the controlled chamber 6 _-1 to 6 _- has become what is released into locations other than n.

FIG. 4 is a flowchart of the control situation showing the applied load reset value setting method in the VAV control system configured as described above.

That is, the temperature sensor T _-1 through T _- even one of the measured temperature based on the detection Todoroki of n, i.e. the control chamber 6 _-1 to 6 _- one at even the room temperature of n is, the VAV unit Damper opening is MAX
If the value exceeds the load reset deviation θ2 despite the value, a load reset command is issued to the control device 4 in order to increase the capacity of the blown air supply temperature. Upon receipt of this load reset command, the control device 4 confirms the load reset command, that is, the capacity increase request (step 401), and based on the following predetermined table, the type of capacity increase request (toe) LR which is a load reset value is selected and determined according to the total status) and the air conditioning condition (temperature control mode) (step 402), and the capacity of the blown air supply temperature is increased by the capacity increase range determined as this load reset value (step 403).
Then, after a lapse of a time sufficient to increase the supply air temperature from the air conditioner 1 by the increase range (step 404), a further increase request is confirmed (step 4).
05), if there is a demand for increased capacity, return to step 402. By repeating the steps 402 to 405, the capacity of the blow-off air supply temperature is increased step by step with each increase in capacity defined as the load reset value, and the room temperature of the controlled room which has risen beyond the load reset deviation θ2 is It will be returned to within the load reset deviation θ2. That is, the room temperature of the controlled room that has fallen into the unsatisfactory state is returned to the satisfactory state.

Next, the control situation by the above-mentioned flowchart will be described more specifically.

That is, for example, the temperature of the blown air supply is now heating in the morning in winter.
It shall be set at 30 ° C. At this time, the motor-operated valve 2 for the cooling coil C / C is in the closed state, and the motor-operated valve 3 for the heating coil H / C is at the set value (S
It is opened at the opening position corresponding to (P = 30 ° C) (see Fig. 1). From such a state, for example, the cooling load increases in the controlled room 6 _-1 , and the room temperature exceeds the load reset deviation θ2 even though the damper opening of the VAV unit 8 _-1 is at the MIN value. When the temperature rises, a load reset command (a demand for increasing the cooling capacity) that prompts a decrease in the blown air supply temperature is issued to the control device 4. The control device 4 which has received this load reset command confirms the demand for increased capacity (step 40
1) Referring to that the temperature control mode at this time is "in heating" and the capacity increase request at this time is "cooling capacity increase request", the load reset value is set to LR = 1.0 based on the above table. Is selected and determined (step 402), and this load reset value is used as the capacity increase range to set the outlet supply air temperature SP.
Is lowered, that is, the valve opening of the motor-operated valve 3 is reduced to SP = 29
C (step 403). Then, after waiting for a sufficient time for the actual blown air supply temperature to drop to 29 ° C. (step 404), further capacity increase request is confirmed (step 405), and if there is a capacity increase request, proceed to step 402. Return.
In this way, when the set value SP of the blown air supply temperature is lowered by 1 ° C. and the set value SP of the blown air supply temperature is lowered to 27 ° C., the motor-operated valve 3 is completely closed at this point. .

Then, when the set value SP of the blow-off air supply temperature is further lowered and reaches 25 ° C, the motor-operated valve 2 is opened this time, and the temperature control mode shifts to "cooling" at this point. Become. Therefore, if the control device 4 receives a cooling capacity increase request thereafter, refer to that the temperature control mode at that time is "cooling" and that the capacity increase request at that time is "cooling capacity increase request". Then, based on the above table, the load reset value is selected and determined as LR = 0.5. That is, after the set value SP of the outlet air supply temperature becomes 25 ° C., the set value SP is decreased by 0.5 ° C., and thus, for example, the set value SP of the outlet air supply temperature is decreased to 20 ° C. The room temperature of the controlled room 6 _-1 is returned to the load reset deviation θ2.

In the above description, the cooling capacity increase request is issued during heating and the cooling capacity increase request reaches the cooling area.However, the heating capacity increase request is issued during cooling and the heating capacity increase request is made. As for the cases up to, the load reset value is set as LR = 1.0 in the "cooling / heating increase capacity request" area, and in the "heating / heating increase capacity request" area, as in the case described above. The load reset value is set as LR = 0.5.

As described above, according to the load reset value setting method according to the present embodiment, when a load reset based on a cooling (heating) capacity increase request is applied during heating (cooling), the load reset value is set as LR = 1.0. , When a load reset is applied during heating (cooling) based on the heating (cooling) increase capacity request, the load reset value is set as LR = 0.5, so heating (cooling) increase capacity is set during heating (cooling). When the demand is made, the capacity of the outlet air supply temperature is not rapidly increased, and the capacity of the outlet air supply temperature is quickly increased when a demand for increasing the cooling (heating) capacity is made during heating (cooling). Will be achieved. Therefore, when a load reset is applied during heating (cooling) based on a cooling (heating) capacity increase request, the time until the load condition that falls into the unsatisfactory state is returned to within the load reset deviation is shortened, and the load condition The dissatisfied state will be resolved in a short time. Also, if a load reset based on a heating (cooling) capacity increase request is applied during heating (cooling), the capacity of the blown air supply temperature will be increased at an appropriate speed, and thus the load status of the controlled room will be reset. There is no possibility that the damper of the VAV unit may cause hunting because it is not returned too much within the deviation.

〔The invention's effect〕

As described above, according to the load reset value setting method in the VAV control system according to the present invention, heating (cooling) is performed.
In order to increase the heating (cooling) capacity in a room, without increasing the capacity of the blown air supply temperature rapidly, the blowing air supply temperature can be promptly increased when a cooling (heating) capacity is requested during heating (cooling). When a load reset is performed based on a cooling (heating) capacity increase request during heating (cooling), the time until the unsatisfied load condition is returned to within the load reset deviation can be achieved. By shortening, it becomes possible to eliminate the unsatisfactory state of the load situation in a short time. When the load is reset based on the heating (cooling) capacity increase request during heating (cooling), the load status of the controlled room is reset by increasing the capacity of the outlet air supply temperature at an appropriate speed. It is possible to prevent the VAV unit from being excessively returned to within the deviation and to prevent the damper of the VAV unit from causing hunting.

[Brief description of drawings]

FIG. 1 is a diagram for more specifically explaining the control situation according to the flowchart shown in FIG. 4, and FIG. 2 is a VAV to which an embodiment of the load reset value setting method according to the present invention is applied.
Instrumentation diagram of the control system, Fig. 3 is a characteristic diagram showing the damper opening of the VAV unit used in this VAV control system, Fig. 4
The figure is a flowchart showing the control status of the load reset value setting method applied to this VAV control system. 1 ...... air conditioner, C / C ...... cooling coil, H / C ...... heating coil, F ...... fan, 4 ...... controller, 5 ...... supply duct, 6 _-1 to 6 _- n ...... be Control room, 7 _{-1 to} 7 _- n …… Regulator, 8 _-1
~ 8 _- n …… VAV unit.

Claims (1)

[Claims] 1. A variable air supply amount adjusting means for controlling the amount of air supplied to the controlled room according to the load status of the controlled room, and the load status of the controlled room. Is in an unsatisfactory state in which the load reset deviation exceeds a predetermined load reset deviation, the load reset deviation is determined by stepwise increasing the capacity of the blown air supply temperature for each predetermined increase range. In the VAV control system including a load reset means for returning the load to the inside, when the load reset based on the cooling capacity increase request is performed during heating, the increase is performed more than when the load reset based on the heating capacity increase request is performed during heating. While increasing the load reset value that determines the capacity range, when performing a load reset based on the heating capacity increase request during cooling, the load based on the cooling capacity increase request during cooling is applied. Load reset value setting method in VAV control system is characterized in that so as to increase the load reset value for determining the increase capacity width than applying a set.