JP3834042B2 - Air conditioning control method and air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning control method and an air conditioning system using a large temperature difference proportional control valve. More specifically, the present invention relates to a large temperature difference proportional control by controlling the large temperature difference proportional control valve separately from the room temperature control. The present invention relates to an improved technology for improving the versatility of air conditioning control / system without losing the advantages of control valves (in particular, eliminating the dependency of air conditioning equipment renewal during renewal).

  Conventionally, for example, in a fan coil device which is a heat radiating terminal of a water-type central air conditioning system, an ON / OFF control type two-way valve is generally used when supplying cold / hot water to a heat exchanger. This ON / OFF control type valve was operated with a fully open or fully closed valve opening.

  However, when such an ON / OFF control type valve is used, the cool / warm water has a fine flow control according to the heat load (for example, the outlet temperature from the fan coil device of the cool / warm water is set to a predetermined temperature). It becomes difficult. Taking cooling operation as an example, when the setting of the outgoing pipe temperature is 7 ° C. and the setting of the return pipe temperature is 17 ° C., the return pipe temperature is returned at 12 ° C. and the cooling capacity is still required. Such as the case. In such a case, a predetermined temperature difference is not ensured between the outgoing pipe and the return pipe, and although the cold heat is not sufficiently utilized, the cold heat is finally insufficient.

  In addition, the fact that a large temperature difference between the outgoing pipe and the return pipe is not ensured cannot reduce the size of the pipe, leading to an increase in initial cost, leading to an increase in conveyance power, and a disadvantage in increasing run-run cost. there were.

  Due to these problems, a large temperature difference proportional control valve has been developed, and fine flow control of cold / hot water according to the heat load has been performed. In the conventional air conditioning system using the large temperature difference proportional control valve, as shown in FIG. 4, the blower fan 1 is operated “strongly” by the controller 5 while the indoor load is large, such as at the time of startup. The magnitude of the indoor load is grasped by, for example, the controller 5 via the indoor detection sensor 3 at that time, and the controller 5 sends a control signal to the blower fan 1 based on the temperature difference. When the room temperature reaches the set temperature, the blower fan 1 automatically performs an operation signal of “medium” or “weak” by a control signal from the controller 5.

  After the room temperature reaches the set temperature, the amount of air passing through the cold / hot water coil 7 decreases when the amount of air blown by the blower fan 1 is reduced. On the other hand, if the amount of cold / hot water supplied to the cold / hot water coil 7 is constant, the heat exchange rate decreases, and the cold / hot water that is not sufficiently heat-exchanged tends to be returned from the cold / hot water coil 7. At this time, the outlet temperature detection sensor 11 attached to the cold / hot water return pipe detects the temperature of the cold / hot water returned from the cold / hot water coil 7, and if the temperature difference between this temperature and the inlet temperature is small, the controller 5 However, it is determined that sufficient heat exchange has not yet been performed, and a signal is sent to the large temperature difference proportional control valve 13 to reduce the valve opening of the large temperature difference proportional control valve 13. Thereby, the cold / hot water having the cooling / heating capacity that has not been used yet stays in the cold / hot water coil 7 for a long time, and is sufficiently heat-exchanged with the blown air.

  Here, the operation procedure in the air conditioning system shown in FIG. 4 will be described more specifically with reference to FIG. When the air conditioning operation is turned on (st1), the air conditioner and the fan coil device are forcibly started up over a predetermined time (generally about 3 minutes) (st3). Next, return temperature control is started (ON) so that the temperature difference of the return pipe becomes a set value (st5). In this return temperature control, it is determined whether or not the temperature difference of the return pipe is a set value. If the temperature difference of the return pipe is not the set value, the indoor detection sensor 3 passes through the controller 5. Proportional control of the large temperature difference proportional control valve 13 is performed (st7). If the temperature difference of the return pipe reaches the set value as a result of the proportional control, the valve opening degree of the large temperature difference proportional control valve 13 is reduced (st9). If the air conditioner OFF signal is not input (st11), the process returns to the return temperature control (st5) again, and the same procedure is repeated.

  According to this air conditioning control method, when the temperature difference from the inlet temperature is small, it is judged that sufficient heat exchange has not yet been performed, and the cold / hot water having the cooling / heating capacity that has not been used up is sufficiently exchanged. Can do. As a result, the heat exchange rate can be increased. This makes it possible to increase the temperature difference between the inlet and outlet of the fan coil device, reduce the amount of circulating water in the chilled / hot water system, and reduce pump capacity, initial cost associated with downsizing the piping size, and operating power. The running cost can be reduced.

JP 2000-266228 A

However, in the conventional air conditioning control method and air conditioning system described above, when the return temperature control is started, it is determined whether or not the temperature difference of the return pipe is a set value, and the temperature difference of the return pipe is set to the set value. If not, proportional control of the large temperature difference proportional control valve 13 by the indoor detection sensor 3 is performed via the controller 5. That is, the large temperature difference proportional control valve 13 is taken into the indoor temperature control system, and is interlockedly controlled via the controller 5 (indoor control interlocking type). For this reason, in the conventional air conditioning system described above, it is not possible to apply only the large temperature difference proportional control valve 13 particularly when the conventional air conditioner is not updated during renewal. In other words, the air conditioner had to be renewed in order to obtain the merit of the large temperature difference proportional control valve (that is, the adoption of the large temperature difference proportional control valve is dependent on the renewal of the air conditioning equipment. ) As a result, the indoor control-linked air conditioning system using the large temperature difference proportional control valve has a problem of low versatility.
In addition, indoor control-linked air conditioning systems that use large temperature difference proportional control valves require interlocking control with a room temperature sensor, so it is not only necessary for new construction work but also for repair work. Cost increased. Further, since interlock control with the room temperature sensor is required, erroneous wiring is likely to occur in the control wiring construction, and operation adjustment is also complicated because confirmation of the interlock control is necessary.
The present invention has been made in view of the above situation, and provides an air-conditioning control method and an air-conditioning system that enable facility construction without depending on air-conditioner renewal, and without losing the advantages of a large temperature difference proportional control valve. The purpose of the new construction is to make it possible to easily and inexpensively cope with the renovation work as well as to prevent erroneous wiring and facilitate operation adjustment.

  In order to achieve the above object, the air conditioning control method according to claim 1 of the present invention circulates and supplies cold / hot water to the heat exchanger of the fan coil device, and allows room air to pass through the heat exchanger. An air conditioning control method of an air conditioning system for exchanging heat between the cold / hot water and the room air, wherein the cold / hot water temperature of a return pipe connected to the heat exchanger is detected so that the cold / hot water temperature becomes a predetermined temperature. A first process for increasing / decreasing the amount of cold / hot water passing through the heat exchanger by a proportional control valve, and forcibly fully closing the proportional control valve when the elapsed time of the increase / decrease control reaches a predetermined time Tb. The second process, the third process for forcibly fully opening the proportional control valve when the elapsed time of the fully closed state reaches a predetermined time Tc, and the elapsed time of the fully opened state reaches a predetermined time Td Return to the first process again and increase or decrease And repeating the control after the treatment.

  In this air conditioning control method, the cold / hot water temperature in the return pipe is detected, and the amount of cold / warm water passing through the heat exchanger is controlled by the proportional control valve so that the cold / hot water temperature becomes a predetermined temperature. When the predetermined time Tb has elapsed, the proportional control valve is forcibly fully closed. When the fully closed state elapses for a predetermined time Tc, the proportional control valve is forcibly fully opened, and when the fully open state elapses for the predetermined time Td, the processes after the increase / decrease control are repeated again. In other words, the proportional control valve is controlled so that the increase / decrease control, the fully closed state, and the fully open state are sequentially repeated for a predetermined time. As a result, after the increase / decrease control, the proportional control valve is forcibly fully closed to actively create an overload state (a state in which the amount of supplied heat is less than the required amount of heat), and then the fully open state. As a result, a large temperature difference is obtained. This overload state is suddenly resolved by supplying a large amount of cold / hot water in the initial fully opened state, and finally it is shifted to the increase / decrease control (return temperature control) state, and the equilibrium with a large temperature difference is maintained. become. Therefore, in this air conditioning control method, the proportional control valve is not taken into the indoor temperature control system, and becomes an independent type that is not directly related to the indoor control. As a result, it does not depend on renewal of the air conditioner, and even at the time of renewal, even if the old air conditioner is not renewed, only the proportional control valve can be applied, without damaging the advantages of the large temperature difference proportional control valve, In addition to the original construction work, it will be possible to carry out easy and inexpensive equipment construction for repair work.

  In the air conditioning control method according to claim 2, the elapsed time Tb of the increase / decrease control is in the range of 10 minutes ≦ Tb ≦ 60 minutes, the elapsed time Tc in the fully closed state is in the range of 3 minutes ≦ Tc ≦ 10 minutes, and The elapsed time Td in the fully opened state is in a range of 3 minutes ≦ Td ≦ 10 minutes.

  In this air conditioning control method, the elapsed time Tb of the increase / decrease control is in the range of 10 minutes ≦ Tb ≦ 60 minutes, and the increase / decrease control is executed with an optimal time length. That is, when the increase / decrease control is shorter than 10 minutes, stable increase / decrease control cannot be obtained, and when it is 60 minutes or more, the interval of the overload state that is actively provided becomes too long and is obtained due to a large temperature difference. The effect is difficult to obtain by following a load that varies with a change in room temperature. Further, the elapsed time Tc in the fully closed state is in a range of 3 minutes ≦ Tc ≦ 10 minutes, and a positive overload state is optimally obtained. That is, if it is shorter than 3 minutes, an overload state is not obtained, and if it is longer than 10 minutes, the heat supply to the fan coil device is too short, and the change in room temperature is limited (temperature difference that makes discomfort uncomfortable) For example, it will exceed about 2 ° C. during cooling. Further, the elapsed time Td in the fully open state is in the range of 3 minutes ≦ Td ≦ 10 minutes, and the overload state due to the forced fully closed state is eliminated at the optimal timing. That is, if it is shorter than 3 minutes, the overload state is not sufficiently resolved, and if it is longer than 10 minutes, the effect obtained by the large temperature difference increase / decrease control is delayed.

  In the air conditioning system according to claim 3, cold / hot water is circulated and supplied to the heat exchanger of the fan coil device, and indoor air passes through the heat exchanger, so that the cold / hot water and the indoor air exchange heat. An outlet temperature detection sensor for detecting a cold / hot water temperature of a return pipe connected to the heat exchanger, and the cold / hot water temperature is a predetermined temperature based on a detection signal from the outlet temperature detection sensor. And a proportional control valve for increasing / decreasing the amount of cold / hot water that passes through the heat exchanger, and forcibly fully closing the proportional control valve when the elapsed time of the increase / decrease control reaches a predetermined time Tb. The proportional control valve is forcibly fully opened when the elapsed time of the fully closed state reaches a predetermined time Tc, and again when the elapsed time of the fully opened state reaches the predetermined time Td. Increase / decrease control Characterized by comprising a control means.

  In this air conditioning system, the proportional control valve is not taken into the indoor temperature control system, and is used as an independent type that is not directly related to the indoor control, compared to the conventional indoor control interlocking type. As a result, the control of the valves is independent, so that it is possible to reduce the cost when a new air conditioning system is installed. In addition, since interlocking control with the indoor detection sensor is unnecessary, the problem of incorrect wiring hardly occurs, and operation adjustment can be facilitated.

  According to the air conditioning control method of the present invention, when the amount of cold / hot water passing through the heat exchanger is controlled to increase or decrease so that the temperature of the cold / hot water becomes a predetermined temperature, the elapsed time of the increase / decrease control reaches a predetermined time Tb. When the proportional control valve is forcibly fully closed, and when the elapsed time of the fully closed state reaches a predetermined time Tc, the proportional control valve is forcibly fully opened, and when the elapsed time of the fully opened state reaches the predetermined time Td Since the processing after the increase / decrease control is repeated again, the proportional control valve is not taken into the indoor temperature control system, and the conventional indoor control interlocking type becomes an independent type that is not directly related to the indoor control. Therefore, the air conditioner is not renewed, and only the proportional control valve can be applied even when the old air conditioner is not updated at the time of renewal. As a result, it is possible to easily and inexpensively perform the facility construction not only for the new construction work but also for the repair work without impairing the advantages of the large temperature difference proportional control valve.

  According to the air conditioning system of the present invention, the outlet temperature detection sensor for detecting the cold / hot water temperature of the return pipe, and the increase / decrease control of the amount of the cold / warm water passing through the heat exchanger based on the detection signal from the outlet temperature detection sensor. Proportional control valve and control means for forcibly closing, fully opening, or increasing / decreasing the proportional control valve for a predetermined time are provided. It can be used as a stand-alone type not directly related. As a result, by making the control of the valves independent, it is possible to reduce the cost when the air conditioning system is newly installed. In addition, since interlocking control with the indoor detection sensor is unnecessary, the problem of incorrect wiring hardly occurs, and operation adjustment can be facilitated.

Hereinafter, preferred embodiments of an air conditioning control method and an air conditioning system according to the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of an air conditioning system according to the present invention. In addition, the same code | symbol is attached | subjected to the member same as the member shown in FIG. 4, and the overlapping description shall be abbreviate | omitted.
The air conditioning system 100 is provided with an air conditioner 21. The air conditioner 21 circulates and supplies cold / hot water to the cold / hot water coil 7 which is a heat exchanger of the fan coil device, and passes the room air through the cold / hot water coil 7 to exchange heat between the cold / hot water and the room air. Let

  The cold / hot water coil 7 is connected to a cold / hot water return pipe 23 and a cold / hot water return pipe 25 from a water-type central cooling / heating system or a heat storage system (not shown). The air conditioner 21 has a built-in blower fan 1. The blower fan 1 exchanges heat by passing the indoor air sucked from the indoor side through the cold / hot water coil 7, and the indoor air that has become the cold / hot air is returned to the room again. Blow out. Further, the blower fan 1 can be variably controlled in the amount of blown air, for example, by an inverter controller 5 to which a room temperature detection signal from the room detection sensor 3 is input.

  That is, the air blower fan 1 is operated “strong” by the controller 5 while the room load is large, such as at the time of startup. For example, the magnitude of the indoor load is grasped by the controller 5 based on the temperature difference between the indoor detected temperature and the set temperature at that time, and the controller 5 sends a control signal to the blower fan 1 based on the temperature difference. When the room temperature reaches the set temperature, the blower fan 1 automatically performs an operation signal of “medium” or “weak” by a control signal from the controller 5.

  An outlet temperature detection sensor 11 is attached to the cold / hot water return pipe 25 connected to the cold / hot water coil 7, and the outlet temperature detection sensor 11 passes through the cold / hot water coil 7 (after heat exchange is completed). Detect cold / hot water temperature. A large temperature difference proportional control valve (hereinafter referred to as “proportional control valve”) 13 is interposed in the return pipe 25 of the cold / hot water downstream from the outlet temperature detection sensor 11, and the proportional control valve 13 has a valve opening degree. Can be controlled without permission. That is, the proportional control valve 13 controls to increase or decrease the amount of cold / hot water passing through the cold / hot water coil 7 so that the detected temperature of the return pipe 25 of the cold / hot water becomes a predetermined temperature. As the proportional control valve 13, for example, a “thermal valve” disclosed in Japanese Patent Laid-Open No. 2000-266228, a “flow control valve” disclosed in Japanese Patent No. 2644423, or the like can be suitably used.

  This increase / decrease control is performed by providing the proportional control valve 13 with a control unit (not shown) capable of feedback control, for example, and inputting a detection signal from the outlet temperature detection sensor 11 to this control unit. Therefore, in the cold / hot water coil 7, when the total air volume passes, heat exchange with the maximum rated capacity is performed, and the water is returned at the rated return temperature. Further, the return temperature of the cold / hot water coil 7 is compensated by the increase / decrease control by the proportional control valve 13 so that a large temperature difference from the inlet side is ensured. This temperature difference is, for example, 10 ° C. of the return water 17 ° C. with respect to the forward water 7 ° C. during cooling, and 10 ° C. of the return water 35 ° C. with respect to the forward water 45 ° C. during heating, for example.

  A control means 27 capable of sequence control is connected to the proportional control valve 13. As the control means 27, a programmable sequencer (PS) etc. other than a relay and a timer can be used. The control means 27 forcibly fully closes the proportional control valve 13 when the elapsed time of the increase / decrease control by the proportional control valve 13 reaches a predetermined time Tb described later. Further, the control means 27 forcibly opens the proportional control valve 13 when the elapsed time of the proportional control valve fully closed state reaches a predetermined time Tc described later. Furthermore, the control means 27 controls the proportional control valve 13 to increase / decrease again when the elapsed time of the proportional control valve fully opened state reaches the predetermined time Td. That is, the proportional control valve 13 is configured so that the increase / decrease control, the fully closed state, and the fully open state are sequentially repeated by the control means 27 for each predetermined time.

Next, an air conditioning control method by the air conditioning system configured as described above will be described.
FIG. 2 is a flowchart showing a processing procedure of an air conditioning control method using the air conditioning system shown in FIG.
In this air conditioning control method, first, when the operation of the air conditioner 21 is started (ON) (st21), the air conditioning equipment is forcibly started up (st23). Next, in the first process, the cold / hot water temperature of the return pipe 25 of the cold / hot water connected to the cold / hot water coil 7 is detected by the outlet temperature detection sensor 11 so that the cold / hot water temperature becomes a predetermined temperature. Return temperature control is performed to increase or decrease the amount of cold / warm water passing through the proportional control valve 13 (st25).

Next, in the second process, when the elapsed time of the increase / decrease control reaches a predetermined time Tb (st27), the proportional control valve 13 is forcibly fully closed (st29).
Next, in the third process, when the elapsed time of the fully closed state reaches a predetermined time Tc (st31), the proportional control valve 13 is forcibly fully opened (st33).
After this, when the elapsed time of the fully opened state reaches the predetermined time Td (st35), if the operation stop signal of the air conditioner 21 is not input (st37), the process returns to the first process again and after the increase / decrease control. The same processing as above is repeated.

  Here, the elapsed time Tb of the increase / decrease control is preferably in the range of 10 minutes ≦ Tb ≦ 60 minutes. That is, when the increase / decrease control is shorter than 10 minutes, stable increase / decrease control cannot be obtained, and when it is 60 minutes or more, the interval of the overload state that is actively provided becomes too long and is obtained due to a large temperature difference. The effect is difficult to obtain by following a load that varies with a change in room temperature. Therefore, when the elapsed time Tb is in the range of 10 minutes ≦ Tb ≦ 60 minutes, the increase / decrease control is executed with an optimal time length.

  The elapsed time Tc in the fully closed state is preferably in the range of 3 minutes ≦ Tc ≦ 10 minutes. That is, if it is shorter than 3 minutes, an overload state cannot be obtained, and if it is longer than 10 minutes, the heat supply to the fan coil device becomes insufficient, and the change in room temperature is the limit (temperature difference that causes discomfort, for example, cooling). It will exceed about 2 ° C. Therefore, when the elapsed time Tc is in the range of 3 minutes ≦ Tc ≦ 10 minutes, a positive overload state is optimally obtained.

  The elapsed time Td in the fully open state is preferably in the range of 3 minutes ≦ Td ≦ 10 minutes. That is, if it is shorter than 3 minutes, the overload state is not sufficiently resolved, and if it is longer than 10 minutes, the effect obtained by the large temperature difference increase / decrease control is delayed. Therefore, when the elapsed time Td is in the range of 3 minutes ≦ Td ≦ 10 minutes, the overload state due to the forced fully closed state is eliminated at the optimum timing.

  FIG. 3 is an explanatory diagram based on an example showing the valve opening degree and the correlation between each part temperature and elapsed time in the air conditioning control method shown in FIG. In FIG. 3, the transition of the valve opening during the cooling operation is shown in the upper stage, the transition of the room temperature / outlet temperature / inlet temperature is shown in the middle stage, and the enlarged view showing the outlet temperature range is expanded in the lower stage. In the case of this example, based on the actual example, the inlet temperature of the cold / hot water outlet pipe 23 is set to 7 ° C., and the outlet temperature of the cold / hot water return pipe 25 is set to 15 ° C. In the example of FIG. 3, the forced start-up operation is first performed, and then the operation is shifted to the air conditioning control method according to the present invention described in the above embodiment. At the time of the forced startup operation, the proportional control valve 13 is fully opened, the forced startup is completed by approximately t2 from the start of the operation, and the process proceeds to increase / decrease control.

  In this example, the increase / decrease control as the first process is performed for a time length Tb from approximately t2 to t5. It can be seen that the outlet water temperature is set to 15 ° C. just before t3 and the valve opening is also stabilized. Next, at approximately T5, the proportional control valve 13 is forcibly fully closed by the passage of the predetermined time Tb, which is the second process. As a result, the outlet water temperature and the inlet water temperature gradually rise, and the room temperature also rises from 20 ° C. to around 22 ° C. When the time Tc has elapsed in the fully closed state, the proportional control valve 13 that is the third process is forcibly fully opened. As a result, the outlet water temperature and the inlet water temperature are rapidly lowered to return to the set temperature, and the room temperature is also returned from 22 ° C. to 20 ° C. again. Thereafter, when the elapsed time of the fully opened state reaches the predetermined time Td, the process returns to the first process again and the processes after the increase / decrease control are repeated.

  In this air conditioning control method, the temperature of the cold / hot water in the return pipe 25 of the cold / hot water is detected, and the amount of the cold / hot water passing through the cold / hot water coil 7 is increased or decreased by the proportional control valve 13 so that the temperature of the cold / hot water becomes a predetermined temperature. Is done. When this increase / decrease control elapses for a predetermined time Tb, the proportional control valve is forcibly fully closed. When the fully closed state elapses for a predetermined time Tc, the proportional control valve is forcibly fully opened, and when the fully open state elapses for the predetermined time Td, the processes after the increase / decrease control are repeated again. In other words, the proportional control valve 13 is controlled to sequentially repeat the increase / decrease control, the fully closed state, and the fully open state by predetermined times Tb, Tc, and Td.

  Thereby, after the increase / decrease control, the proportional control valve 13 is forcibly fully closed, so that an overload state (a state in which the supplied heat amount is small with respect to the required heat amount) is actively created, and then the fully open state is established. By entering the state, a large temperature difference is obtained. This overload state is suddenly resolved by supplying a large amount of cold / hot water in the initial fully opened state, and finally it is shifted to the increase / decrease control (return temperature control) state, and the equilibrium with a large temperature difference is maintained. become.

  Therefore, according to this air conditioning control method, the proportional control valve 13 is not taken into the room temperature control system, and becomes a stand-alone type that is not directly related to room control from the conventional room control interlocking type. . That is, it does not depend on the air conditioner renewal, and only the proportional control valve 13 can be applied even when the old air conditioner is not renewed at the time of renewal. As a result, it is possible to easily and inexpensively perform the facility construction not only for the new construction work but also for the repair work without impairing the advantages of the large temperature difference proportional control valve.

  In addition, according to the air conditioning system 100 described above, the outlet temperature detection sensor 11 that detects the temperature of the cold / hot water in the return pipe 25 of the cold / hot water and the cold / hot water coil 7 that passes through the detection signal from the sensor 11 for detecting the outlet temperature. Since the proportional control valve 13 for increasing / decreasing the amount of cold / hot water to be controlled and the control means 27 for forcibly fully closing, fully opening or increasing / decreasing the proportional control valve 13 for a predetermined time, the proportional control valve 13 is The conventional indoor control interlocking type can be used as an independent type that is not directly related to the indoor control. As a result, by making the valve control independent, it is possible to reduce the cost when the air conditioning system is newly installed. Further, since interlocking control with the indoor detection sensor 3 is not required, the problem of miswiring is less likely to occur, and operation adjustment can be facilitated.

  In the above embodiment, the case where the heat exchanger is the cold / hot water coil 7 of the air conditioner 21 has been described as an example. However, the present invention also applies to an air conditioner using VAV control or the like. In this case, the same effect as described above can be obtained.

It is a block diagram of the air conditioning system which concerns on this invention. It is a flowchart showing the process sequence of the air-conditioning control method using the air-conditioning system shown in FIG. It is explanatory drawing showing the valve opening degree in the air-conditioning control method shown in FIG. 2, each part temperature, and the correlation with elapsed time. It is a block diagram showing the outline of the conventional air conditioning system. It is a flowchart showing the process sequence of the air-conditioning control method using the conventional air conditioning system shown in FIG.

Explanation of symbols

  7 ... Cold / hot water coil (heat exchanger), 11 ... Sensor for detecting outlet temperature, 13 ... Large temperature difference proportional control valve (proportional control valve), 25 ... Cold / hot water return pipe, 27 ... Programmable sequencer (control means), DESCRIPTION OF SYMBOLS 100 ... Air-conditioning system, Tb ... Elapsed time of increase / decrease control for predetermined time, Tc ... Elapsed time for fully closed state for predetermined time, Td ... Elapsed time for fully open state for predetermined time

Claims (3)

An air conditioning control method for an air conditioning system in which cold / hot water is circulated and supplied to a heat exchanger of a fan coil device, and indoor air is passed through the heat exchanger to exchange heat between the cold / hot water and the indoor air. ,
A first process of detecting a cold / hot water temperature of a return pipe connected to the heat exchanger, and increasing / decreasing the amount of the cold / warm water passing through the heat exchanger by a proportional control valve so that the cold / hot water temperature becomes a predetermined temperature. When,
A second process for forcibly fully closing the proportional control valve when the elapsed time of the increase / decrease control reaches a predetermined time Tb;
A third process for forcibly fully opening the proportional control valve when the elapsed time of the fully closed state reaches a predetermined time Tc;
An air conditioning control method characterized in that when the elapsed time in the fully open state reaches a predetermined time Td, the process returns to the first process again and the processes after the increase / decrease control are repeated. The elapsed time Tb of the increase / decrease control is in the range of 10 minutes ≦ Tb ≦ 60 minutes,
The elapsed time Tc of the fully closed state is in a range of 3 minutes ≦ Tc ≦ 10 minutes,
The elapsed time Td in the fully opened state is in a range of 3 minutes ≦ Td ≦ 10 minutes. An air conditioning system in which cold / hot water is circulated and supplied to the heat exchanger of the fan coil device, and indoor air passes through the heat exchanger, whereby heat is exchanged between the cold / hot water and the indoor air,
An outlet temperature detection sensor for detecting a cold / hot water temperature of a return pipe connected to the heat exchanger;
A proportional control valve for increasing / decreasing the amount of cold / hot water passing through the heat exchanger so that the cold / hot water temperature becomes a predetermined temperature based on a detection signal from the outlet temperature detection sensor;
The proportional control valve is forcibly fully closed when the elapsed time of the increase / decrease control reaches a predetermined time Tb, and the proportional control valve is forcibly closed when the elapsed time of the fully closed state reaches a predetermined time Tc. And an air-conditioning system comprising: control means for increasing / decreasing the proportional control valve again when the fully-open state has elapsed for a predetermined time Td.

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