JP2008190784A - Air-conditioning intermittent operation control system and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-conditioning intermittent operation control system and an air-conditioning intermittent operation control method capable of controlling an intermittent operation without disposing a sensor in a room. <P>SOLUTION: This air-conditioning intermittent operation control system for adjusting the indoor air environment by performing the intermittent operation of operation and stop of an air conditioner, is provided with a temperature sensor 5 disposed in a returned-air duct 9R for measuring a temperature of the returned air from the room, and a control means for setting a next operation stop time of the air conditioner on the basis of a peak value of the returned-air temperature measured by the temperature sensor 5 to perform the intermittent operation of the air conditioner. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioning intermittent operation control system and an air conditioning intermittent operation control method for performing intermittent operation of an air conditioner while favorably maintaining an indoor environment such as indoor temperature in a building such as a building or a department store, carbon monoxide, carbon dioxide, etc. About.

  Conventionally, air conditioning control in a building has been performed on a plurality of air conditioners (hereinafter simply referred to as air conditioners) installed in the room. For example, when a building is a large-scale building, several tens to several hundreds of air conditioner control devices (DDC (Direct Digital Controller, etc.)) are distributed and installed in various places in the building. However, the air conditioner is automatically controlled based on the indoor temperature detected by the temperature sensor installed in each room, and the cooling operation or the heating operation is performed so that the indoor air temperature becomes the set temperature value. .

On the other hand, as an energy saving measure, air conditioners are also subjected to various energy saving controls in harmony with the living environment. For example, as an energy-saving measure for air conditioners, control that reduces the overall operation time by repeating the operation and stop of the air conditioner within a range that does not impair the indoor environment, that is, intermittent operation control is performed (for example, patents). Reference 1).
JP 2004-012108 A

  However, conventionally, in the intermittent control of air conditioning of buildings and the like, the indoor environment while the air conditioner is stopped, for example, room temperature, is continuously measured by the temperature sensor, and based on the room temperature measured by this temperature sensor. The air conditioner was started and stopped.

  Therefore, in such intermittent control of the air conditioner, for example, when cooling operation is performed, the air in the return air duct is stopped by stopping the air conditioner while the air conditioner is stopped by intermittent operation. The air temperature in the return air duct is almost constant because the air is stationary (residence), and even if the room temperature rises during this stop, the air temperature rises from the air temperature in the return air duct. Could not be detected.

  Therefore, when performing intermittent operation control of the air conditioner, it is necessary to install a temperature sensor on a predetermined wall surface in the room and monitor the room temperature while the air conditioner is stopped. However, if the temperature sensor is installed in a room other than the duct, there will be additional wiring work costs, and problems such as design and design problems and the need to consider the sensor position each time the interior is changed may occur. is there.

  Under such circumstances, as part of energy-saving measures for air conditioners, temperature sensors are also installed indoors for air conditioners that control air conditioning based on the temperature in the return air duct (return air temperature control method). There has been a considerable demand for a technique for introducing intermittent operation control.

  This invention is made | formed in view of such a technical subject, The objective is to provide the air-conditioning intermittent operation control system and air-conditioning intermittent operation control method which can be applied to the air conditioner of a return air temperature control system. .

  In order to solve the above problems, an air conditioning intermittent operation control system according to claim 1 is an air conditioning intermittent operation control system that adjusts the indoor air temperature by intermittently operating the air conditioner and stopping the air conditioner. The gist is to have a temperature sensor for measuring the air temperature, and a control means for setting the stop time of the next air conditioner from the peak value of the return air temperature measured by the temperature sensor and performing intermittent operation of the air conditioner. To do.

  According to the air conditioning intermittent operation control system of the present invention, when the air conditioner is restarted, indoor air whose temperature has changed (for example, increased) while the air conditioner is stopped returns to the air conditioner through the return air duct. Similarly, the temperature in the return air duct also changes (rises). The temperature change in the return air duct is measured by a temperature sensor, and the greater the temperature change (rise), the greater the temperature change in the room while it was stopped. After a while, the room is again conditioned (cooled) by the air blower (cold air) of the air conditioner, and the temperature in the return air duct also changes (decreases).

  A change (increase) in the room temperature during stoppage is judged from the return air temperature peak value after restarting the air conditioner, and the stoppage time after the intermittent operation is adjusted. Thereby, intermittent operation by a return air temperature sensor is enabled without providing a temperature sensor in the room.

  In addition, the air conditioning intermittent operation control system of claim 2 is an air conditioning intermittent operation control system that adjusts the indoor air conditioning environment by intermittently operating the air conditioner and stopping, and is included in the return air from the room. Concentration sensor that measures the concentration (gas concentration) of at least one of carbon oxide and carbon dioxide, and the next air conditioning from the peak value of the concentration (gas concentration) of at least one of carbon monoxide and carbon dioxide measured by this concentration sensor And a control means for setting the stop time of the machine and performing intermittent operation of the air conditioner.

  The air conditioning intermittent operation control system of the present invention measures carbon dioxide contained in human exhalation and carbon monoxide contained in the exhaust of an engine such as an internal combustion engine, and performs air conditioning control based on this measured value. That is, when the air conditioner is restarted, air whose carbon monoxide concentration or carbon dioxide concentration (gas concentration) has changed while the air conditioner is stopped returns to the air conditioner through the return air duct. The concentration will change as well. The change in gas concentration in the return air duct is measured by a gas concentration sensor. The greater the change in gas concentration, the greater the change in gas concentration in the room while it was stopped. After a while, the room is ventilated by the air blow from the air conditioner, and the gas concentration in the return air duct changes accordingly. Since the gas concentration is substantially the same in the return air duct and the air supply duct, the gas concentration sensor may be provided in either the air duct or the air supply duct.

  A change in the indoor gas concentration during stoppage is determined based on the return air gas concentration peak value after the air conditioner is restarted, and the stop time next to the intermittent operation is adjusted. Thereby, intermittent operation by the concentration sensor is possible without newly providing a concentration sensor in the room.

  The air conditioning intermittent operation control method according to claim 3 is an air conditioning intermittent operation control system that adjusts the temperature of the room supplied by the air conditioner by intermittently operating and stopping the air conditioner. There is an operation control method in which a peak value is detected from a return air temperature measured by a temperature sensor, a stop time is set next to the air conditioner by the control means from this peak value, and intermittent operation of the air conditioner is performed. And

  Furthermore, the air conditioning intermittent operation control method of claim 4 is an air conditioning intermittent operation control method used in an air conditioning intermittent operation control system that adjusts the indoor temperature by intermittently operating and stopping the air conditioner. The control means measures the concentration of at least one of carbon monoxide and carbon dioxide contained in the return air from the air, and the control means calculates the following from the peak value of the concentration of at least one of carbon monoxide and carbon dioxide measured by the concentration sensor. The gist is to set the stop time of the air conditioner and perform intermittent operation of the air conditioner.

  According to the air conditioning intermittent operation control system and the air conditioning intermittent operation control method of the present invention, the change in the room temperature while the air conditioner is stopped is determined based on the return air temperature peak value after the air conditioner is restarted, and the next stop of the intermittent operation is performed. Since the time is adjusted, intermittent operation can be performed only with the return air temperature sensor without providing a temperature sensor in the room.

  Similarly, a change in indoor gas concentration during stoppage is judged from the peak value of the return gas concentration after restarting the air conditioner, and a new concentration sensor is installed in the room by adjusting the next stop time after intermittent operation. Without any problem, intermittent operation can be made possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an air conditioning intermittent operation control system to which an air conditioning intermittent operation control method according to the present invention is applied, and FIG. 2 shows the air conditioning control and room temperature in the air conditioning intermittent operation control system shown in FIG. FIG. 3 is a graph showing the relationship between the return air temperature peak value and the next cycle stop time.

  First, the configuration of an air conditioning intermittent operation control system according to the present invention will be described with reference to FIG. The air conditioning intermittent operation control system shown in FIG. 1 is an air conditioning system that is installed and used in a room such as a building. Each of the air conditioning systems is appropriately monitored and controlled by a central monitoring device (not shown) or the like, and is not intermittently shown. An intermittent operation is performed by the operation control unit, thereby saving energy.

  The air conditioner main body 1 includes a cooling (heating) coil (hereinafter also simply referred to as a cooling coil) 11 and a blower 13 including a cooling coil and a heating coil. The cooling coil 11 is connected to a cold (hot) water valve (hereinafter also simply referred to as a cold water valve) 3 comprising a cold water valve and a hot water valve. Further, a return air duct 9R is attached to the return air inlet for taking in the return air RA (Return Air) of the air conditioner body 1, and an outside air duct 9O is attached to the outside air inlet for taking in the outside air OA (Outdoor Air). An air supply duct 9S is attached to an air supply port that discharges SA (Supply Air).

  Further, a temperature sensor 5 is provided at an arbitrary position of the return air duct 9R piped in each room in the building, preferably at a position near the air intake in the room in the return air duct 9R. In addition, this temperature sensor 5 may be installed in the position close | similar to the return opening of the air-conditioner main body 1, In this case, the wiring construction to the temperature sensor 5 can further be simplified. That is, in the present embodiment, the temperature sensor 5 is not installed in the room other than the inside of the return air duct 9R. Therefore, it is necessary to install the temperature sensor 5 in the room and perform wiring work during the air conditioning work. Does not occur.

  The temperature sensor 5, the chilled water valve 3, and the blower 13 in the air conditioner main body 1 are connected to a DDC 7 that functions as a control unit including a memory that stores a table and the like, which will be described later, and a CPU.

  The DDC 7 is provided for each air conditioner 1 main body in each room and controls the air conditioner main body 1. In other words, the DDC 7 drives and controls the blower 13 and also detects the current temperature value detected by the temperature sensor 5 (the temperature of the indoor air flowing into the return air duct 9R) and a preset set temperature value (target). The amount of cold water supplied to the cooling coil 11 is controlled by controlling the valve opening of the cold water valve 3 so that the temperature value detected by the temperature sensor 5 matches the set temperature value based on the deviation from the temperature value). adjust.

  For example, when the temperature value detected by the temperature sensor 5 is lower than the set temperature value, the opening degree of the hot water valve of the cold (warm) water valve 3 is controlled, and the temperature value detected by the temperature sensor 5 is the set temperature. When the value is higher than the value, the valve opening degree of the cold water valve 3 is controlled.

  Further, as described above, the DDCs 7 provided for the air conditioner main bodies in the plurality of rooms are connected so as to be capable of bidirectional communication with, for example, a central monitoring device installed in a monitoring room of a building. This central monitoring device inputs the temperature value detected by each temperature sensor 5, calculates the set temperature value corresponding to the DDC 7 in each room, and outputs a signal related to the valve opening to the DDC 7 as appropriate, Moreover, the monitor display of the monitoring results such as the set temperature value and the temperature value detected by the temperature sensor 5 in the return air duct 9R is performed.

  That is, the central monitoring device calculates a set temperature value in the room in which the temperature sensor 5 is provided based on the temperature value detected by the temperature sensor 5, and outputs, for example, a signal related to the valve opening to the DDC 7, and the DDC 31. Controls the valve opening of the chilled water valve 3 described above based on a signal related to the valve opening or the like or a valve set temperature value. The central monitoring device may be configured to store a table and the like to be described later in a memory and to function as a control unit in cooperation with the DDC 31.

  Next, the operation of the air conditioning intermittent operation control system shown in the present embodiment will be described.

  First, in the air conditioning intermittent operation control system of this embodiment, the stop time when stopping at the next intermittent operation cycle is adjusted based on the peak value of the return air temperature at the time of restart after the operation stop at the time of intermittent operation. By doing so, the rise in the room temperature during the air conditioner stop control after the next cycle is suppressed, and the operation of the air conditioner is suppressed within a range that does not affect the indoor environment.

  With reference to FIG. 2 and FIG. 3, the said effect | action is demonstrated in detail in the case of the cooling operation as an example. In FIG. 2, the uppermost solid line indicates the cooling operation and stop status of the air conditioner, the next solid line indicates the return air temperature measured by the temperature sensor 5 in the return air duct 9R, and the broken line (dotted line) indicates the effect. The room temperature measured by a temperature sensor for room temperature measurement separately provided in the room to confirm the above is shown.

  According to the graph shown in FIG. 2, it can be seen that the room temperature gradually increases after the air conditioner is stopped for a predetermined time by the intermittent operation control of the air conditioner, while the return air temperature does not increase. This is because the air in the return air duct 9R is also staying because the air conditioner is stopped and is not affected by the temperature rise in the room.

  Next, when the cooling operation of the air conditioner is resumed, warm indoor air is sucked into the return air duct 9R and flows into the return air duct 9R, so that the temperature sensor 5 in the return air duct 9R causes a slight delay. The measured return air temperature also rises rapidly. The peak value a of the return air temperature is substantially equal to the room temperature.

  Furthermore, as the cooling operation of the air conditioner resumes, the room temperature also gradually decreases, and the return air temperature also begins to decrease in conjunction with this. Thereafter, after the return air temperature measured by the temperature sensor 5 in the return air duct 9R reaches a preset temperature value (target temperature value) set in advance, the cooling operation of the air conditioner is performed again after a predetermined time has elapsed. When stopped, the room temperature begins to rise gradually immediately after the stop. As the room temperature rises, the return air temperature in the return air duct 9R also rises.

  In the same manner, as the air conditioner is operated and stopped, the indoor temperature is repeatedly lowered and raised, and the return air temperature is also lowered and raised in conjunction with the indoor temperature.

  In the present embodiment, by determining the next stop time b based on the value of the peak value a of the return air temperature, the peak value c of the return air temperature after the next restart does not exceed the allowable value. In addition, intermittent operation control is possible that can suppress the room temperature rise d during the stop indirectly within an allowable range. As a result, the increase in the room temperature at the time of restarting the next operation becomes moderate, and the temperature change due to the intermittent operation control can be suppressed as much as possible, so that an air environment friendly to the occupants can be provided.

  Next, an example of a procedure for determining the next cycle stop time b from the return air temperature peak value a will be described with reference to FIG. In the example of the graph shown in FIG. 3, when the return air temperature peak value after restarting the air conditioner is less than 27 ° C., it is stopped for 20 minutes, and when it exceeds 29 ° C., it is not stopped. That is, when the room temperature is between 25 ° C. and 29 ° C., the stop time, for example, the next cycle stop time b is determined by a table based on the proportional relationship of this graph.

In the graph shown in FIG. 3, the slope and intercept of the graph can be arbitrarily set for each air conditioner according to the indoor environment. For example, the volume of the room where the air conditioner is installed, the total air conditioning capacity of the air conditioner (the sum of the air conditioning capacity of each air conditioner for each room), the type and number of OA equipment installed in the room, etc. In addition to the factors, the number of people in the room, the season, the time zone, and other variable factors. In addition, when using a sensor type, for example, a CO ₂ concentration sensor or a CO (carbon monoxide) concentration sensor, which will be described later, the slope and intercept are appropriately changed. There are various other application methods for determining the stop time.

  Next, ventilation amount control using a gas temperature sensor will be described. Maintenance of the indoor environment by controlling the ventilation amount is particularly effective in, for example, a theater (carbon dioxide concentration) in which a large number of people are present or an indoor parking lot (carbon monoxide concentration).

That is, In the room or the like where a large number of people to occupancy by carbon dioxide contained in human breath room air environment deteriorates, the carbon dioxide (CO ₂₎ concentration deterioration of air environment due to an increase in carbon dioxide A good air environment can be maintained by detecting with a sensor and performing ventilation. Similarly, in an indoor parking lot, the carbon monoxide contained in the exhaust of an automobile engine (internal combustion engine, external combustion engine) deteriorates the air environment in the indoor parking lot. This increase in carbon monoxide A good air environment can be maintained by detecting the deterioration of the air environment with a carbon monoxide (CO) concentration sensor and performing ventilation.

  At this time, the gas concentration sensor such as the carbon dioxide concentration sensor or the carbon monoxide concentration sensor has almost no change in the gas concentration between the return air duct 9R and the supply air duct 9S of the air conditioner. Any of 9S may be provided. Strictly speaking, the gas concentration differs between the return air duct 9R and the supply air duct 9S because the air temperatures thereof are different. However, in an environment where the difference cannot be ignored, so-called temperature correction is performed. This is resolved as appropriate.

  In the ventilation control by intermittent operation realized by using the carbon dioxide concentration sensor in the return air duct 9R or the supply air duct 9S, even when the carbon dioxide concentration changes depending on the number of people in the room, it depends on the carbon dioxide concentration instead of the constant air flow. Therefore, it is possible to save energy in order to control the necessary ventilation amount.

  In other words, conventionally, a method has been used to change the inverter frequency of the blower, the duct damper opening, etc. using the carbon dioxide sensor signal, but the fan motor itself must be continuously operated, so the amount of power reduction There were limits. On the other hand, in this embodiment, since the fan can be intermittently operated, a higher energy saving effect can be obtained.

  Similar ventilation control by intermittent operation enables intermittent operation of an air supply / exhaust fan such as a parking lot using a carbon monoxide concentration sensor.

  Carbon monoxide can be measured accurately and stably by the constant potential electrolysis method, electrochemical method, and semiconductor method using metal oxide, and carbon dioxide can be accurately measured by solid electrolyte method and non-dispersive infrared method. Since stable measurement is possible, it is selected and used as appropriate according to the installation environment.

  Further, when the gas concentration sensor is used, a change in the indoor gas concentration during stoppage is determined from the return air gas concentration peak value after the air conditioner is restarted, and the stop time next to the intermittent operation is adjusted. Thereby, intermittent operation by the concentration sensor is possible without newly providing a concentration sensor in the room.

  The control algorithm of the air conditioning intermittent operation control system according to the embodiment of the present invention may be programmed and stored in a computer-readable recording medium. Thereby, the air-conditioning intermittent operation control system and method of the present invention can be realized. Here, the recording medium includes, for example, a semiconductor memory and various recording disks.

It is a block diagram which shows the structure of the air-conditioning intermittent operation control system of this invention. It is a graph which shows the relationship between the air-conditioning control and room temperature in the air-conditioning intermittent operation control of this invention. It is a graph which shows the relationship between a return air temperature peak value and the next period stop time.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air conditioner main body 3 ... Cold (warm) water valve 5 ... Temperature sensor 7 ... DDC
9R ... Return air duct 9O ... Outside air duct 9S ... Air supply duct 11 ... Cooling (heating) coil 13 ... Blower RA ... Return air OA ... Outside air SA ... Air supply

Claims (4)

An air conditioning intermittent operation control system that adjusts the indoor air temperature by intermittently operating and stopping the air conditioner,
A temperature sensor for measuring the return air temperature from the room;
An air conditioning intermittent operation control system comprising: a control unit that sets a stop time of the next air conditioner from a peak value of the return air temperature measured by the temperature sensor and performs intermittent operation of the air conditioner. An air conditioning intermittent operation control system that adjusts the indoor air conditioning environment by intermittently operating and stopping the air conditioner,
A concentration sensor that measures the concentration of at least one of carbon monoxide and carbon dioxide contained in the return air from the room;
An air conditioner having control means for setting a stop time of the next air conditioner from a peak value of the concentration of at least one of carbon monoxide and carbon dioxide measured by the concentration sensor and performing intermittent operation of the air conditioner Intermittent operation control system. There is an air-conditioning intermittent operation control method used in an air-conditioning intermittent operation control system that adjusts the temperature of the room supplied by the air conditioner by performing intermittent operation of operation and stop of the air-conditioner,
The peak value is detected from the return air temperature measured by the temperature sensor,
Set the stop time next to the air conditioner by the control means from this peak value,
An air conditioning intermittent operation control method characterized by performing intermittent operation of an air conditioner. An air-conditioning intermittent operation control method used in an air-conditioning intermittent operation control system that adjusts the indoor temperature by intermittent operation of operation and stop of an air conditioner,
The concentration sensor measures the concentration of at least one of carbon monoxide and carbon dioxide contained in the return air from the room,
The control means sets the stop time of the next air conditioner from the peak value of the concentration of at least one of carbon monoxide and carbon dioxide measured by this concentration sensor,
An air conditioning intermittent operation control method characterized by performing intermittent operation of an air conditioner.

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