JP4533826B2 - Air conditioning control system - Google Patents

Description

  The present invention relates to an air conditioning control system that adjusts the temperature of a building or factory using hot water or cold water.

  Air conditioners are used to adjust the temperature of buildings and factories. Adjustment of the temperature in the air conditioner is performed by changing the opening of a valve that adjusts the flow rate of heated hot water (hot water) or cooling water (cold water) sent into the air conditioner.

  For example, in the case of heating with hot water, if the temperature measurement value is lower than the temperature setting value, the temperature is increased by increasing the opening of the heating valve, and if the temperature measurement value is higher than the temperature setting value, Reduce the temperature by reducing the opening of the heating valve. On the other hand, in the case of cooling with cold water, if the temperature measurement value is lower than the temperature set value, the temperature is raised by reducing the opening of the cooling valve, and if the temperature measurement value is higher than the temperature set value, Increase the opening of the cooling valve to lower the temperature.

  When the air conditioner is started, the deviation between the room temperature and the set temperature is large. Therefore, in the valve control, the valve may be greatly opened and closed to eliminate the temperature deviation, and the load on the heat source may increase. This is because the main purpose is to quickly reach the set value (target value) at room temperature, and a large load is allowed to be applied when starting the air conditioner.

Here, there is an air conditioning control system that can suppress a temperature drop (rise) that occurs when the number of operating air conditioners changes (see, for example, Patent Document 1). In addition, there is a method in which the cold / hot water is reliably determined at the time of rising in the morning so that the determination of the cold / hot water during the day is not delayed (for example, see Patent Document 2).
JP-A-11-94331 Japanese Patent Laid-Open No. 10-176858

  However, at the present time when there is an increasing need to reduce wasteful energy consumption, it is desirable to avoid as much as possible a large load at the start-up of the air conditioner. Also, if the deviation between the room temperature and the set temperature at the start of the air conditioner is large, not only will the heat source load increase, but if the number of heat sources is being controlled, the number of operating units will increase temporarily. There is a risk of inviting. Thus, it may be troublesome to manually set the temperature of the air conditioner in a slightly relaxed direction and reset the air conditioner to a predetermined set temperature after the air conditioner is in a steady operation state.

  An object of the present invention is to provide an air conditioning control system that can automatically suppress a sudden load on a heat source at the time of starting an air conditioner and can save energy without trouble.

The air conditioning control system of the present invention includes a control element that calculates a valve opening command signal that adjusts the amount of heat so that there is no deviation between the room temperature and the set temperature, and a valve opening command signal obtained by the control element; Based on the low value priority circuit that selects and outputs the smaller one of the predetermined valve opening suppression signals having the characteristic that the output of the heat quantity increases with time, and the signal selected by the low value priority circuit And a valve control circuit for controlling the opening degree of the valve of the air conditioner.

  According to the present invention, an air conditioner is selected by selecting a smaller one of a valve opening command signal for adjusting the amount of heat so that there is no deviation between the room temperature and the set temperature and a predetermined valve opening suppression signal. Since the opening of the valve is controlled, a sudden load on the heat source at the time of starting the air conditioner is automatically suppressed, and energy can be saved without trouble.

  Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of an air conditioning control system according to an embodiment of the present invention. The indoor temperature Ta of the house 11 is detected by the temperature detector 12 and input to the control element 13. The control element 13 calculates a valve opening command signal θ for adjusting the amount of heat so that there is no deviation between the room temperature Ta and the set temperature SV. The valve opening command signal θ obtained by the control element 13 is input to the low value priority circuit 14 and the smaller one of the predetermined valve opening suppression signals θL is selected. The signal selected by the low value priority circuit 14 is input to the valve control circuit 15, and the bubble control circuit 15 controls the opening of the valve of the air conditioner 16 based on the signal selected by the low value priority circuit 14.

  FIG. 2 is a characteristic diagram showing the operation of the air conditioning control system according to the embodiment of the present invention. The vertical axis represents the valve opening, and the horizontal axis represents time. For example, the valve opening degree suppression signal θL is set to a characteristic that the output of the heat quantity increases with time. FIG. 2 shows a case where the valve opening is set to 100% after the elapse of T seconds from the start of the air conditioner (t0). Since the valve opening degree suppression signal θL is smaller than the valve opening degree command signal θ from the start (t0) to the time point t1, the output of the low value priority circuit 14 becomes the valve opening degree suppression signal θL. That is, the valve opening command signal θ that is the output of the control element 13 is suppressed by the valve opening suppression signal θL. When the time point t1 elapses, the valve opening degree suppression signal θL becomes larger than the valve opening degree command signal θ, so that the output of the low value priority circuit 14 becomes the valve opening degree command signal θ, and the valve that is the output of the control element 13 The valve is controlled by the opening command signal θ.

  FIG. 3 is a flowchart showing the operation of the air conditioning control system according to the embodiment of the present invention. First, the valve opening suppression signal θL is set. The valve opening suppression signal θL is set by setting the valve opening A and the suppression time T (S1). After setting the valve opening suppression signal θL, the air conditioner is started (S2). Then, the valve opening command signal θ is calculated by the control element 13 based on the room temperature Ta and the temperature set value SV (S3), the valve opening command signal θ and the valve opening suppression signal θL are compared, and the valve opening command signal θ is compared. When the suppression signal θL is large, the low value priority circuit 14 selects the valve opening command signal θ (S5), and when the valve opening suppression signal θL is small, the low value priority circuit 14 suppresses the valve opening. The signal θL is selected (S6).

  Thus, immediately after the start of the air conditioner having a large deviation between the room temperature Ta and the set temperature SV, a valve opening suppression signal θL is prepared so that the output increases with time, and PID control (control element based on actual temperature) is prepared. 13), the smaller one is output for comparison between the output (valve opening command signal θ) and the suppression signal (valve opening suppression signal θL). As described above, by suppressing the valve output for a while after the start of the air conditioner, the load on the heat source can be suppressed, and the rapid load on the heat source at the time of starting the air conditioner can be suppressed.

  Next, FIG. 4 is a characteristic diagram showing another example of the operation of the air conditioning control system according to the embodiment of the present invention. In FIG. 4, the characteristic which shows reduction of the heat source starting load during external cooling is shown. There are many buildings with a cooling load in the interior of the house 11 in winter. To save energy, the outside air damper is opened and only air is blown, and the heat source pump is operated without being operated. In this case, the temperature and indoor load gradually increase from daytime to afternoon, and cold water supply may be required.

  In such a case, if you endure to the last minute for energy saving and try to operate the heat source, most of the valves of the air conditioner are already open at that time, so the amount of water supplied from the heat source is more than necessary. As a result, the power consumption of the pump becomes temporarily excessive. As shown in FIG. 4A, when the pump is started at time t2, the heat source water supply amount Q becomes excessive.

  Therefore, using the pump operation signal as a trigger, the valve opening suppression signal θL is started at time t2, and the valve opening command signal θ (PID control output by temperature) that is the output of the control element 13 and the valve opening suppression signal θL Are compared and the smaller one is output. Thereby, the rapid increase in the heat source water supply amount Q can be suppressed.

The block diagram of the air-conditioning control system concerning embodiment of this invention. The characteristic view which shows operation | movement of the air-conditioning control system concerning embodiment of this invention. The flowchart which shows operation | movement of the air-conditioning control system concerning embodiment of this invention. The characteristic view which shows another example of operation | movement of the air-conditioning control system concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Built-up room, 12 ... Temperature detector, 13 ... Control element, 14 ... Low value priority circuit, 15 ... Valve control circuit, 16 ... Air conditioner

Claims (1)

A control element that calculates a valve opening command signal that adjusts the amount of heat so that there is no deviation between the room temperature and the set temperature, and the amount of heat output increases with time and the valve opening command signal obtained by the control element. A low value priority circuit that selects and outputs a smaller one of the predetermined valve opening suppression signals having characteristics, and the opening of the valve of the air conditioner based on the signal selected by the low value priority circuit. An air conditioning control system comprising a valve control circuit for controlling the degree.

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