JP3602810B2 - Temperature control method and its control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an indoor temperature control method and an improvement of a control device therefor, and more particularly to an indoor temperature control method and a control device thereof that require precise temperature control such as a clean room.
[0002]
[Prior art]
Conventionally, in order to keep the temperature in the clean room constant and precise, using a cooling only machine and an electric heater for reheating, the air was once cooled by a refrigerator and then the output of the electric heater was proportionally controlled to control the temperature. The method is adopted. FIG. 4 shows an outline of an example. The clean room temperature control device 50 includes a cooling coil 52 connected to a refrigerator 51 and an electric heater 53. Reference numeral 55 denotes an air suction port from the clean room, and 56 denotes a temperature measuring device provided near the suction port. However, the refrigerator 51 is always operated at full load, and the electric heater 53 heats air by proportional control to perform temperature control. F indicates a fan for supplying air to the clean room.
[0003]
In addition, there is a method using step thermo as a temperature control method. The outline is shown in FIG. However, the outline of the temperature control device is the same as that of FIG. 4, and the description is omitted. In the figure, the horizontal axis represents the temperature, and Steps 1, 2, 3, 4, and 5 are provided as a temperature control range using the point A as a reference temperature. Here, a is a differential, and b is a step value. Each step is, for example, sequentially heating (high temperature), heating (low temperature), cooling (weak), cooling (medium), and cooling (strong). In each step, heating and cooling are performed in accordance with the indoor load. It is something to do.
[0004]
[Problems to be solved by the invention]
By the way, in the above-mentioned first method of controlling the temperature by proportionally controlling the output of the electric heater after cooling the air with the first refrigerator, wasteful energy is consumed and the power receiving capacity is increased. There are problems such as the need for new equipment.
[0005]
Although the step thermo system is usually suitable for the specification of ± 2 ° C., when the temperature is precisely controlled, for example, when the temperature is ± 1 ° C., the width of the differential a and the step b becomes narrow. Disadvantages such as increased durability.
[0006]
The present invention has been made in view of the above-described problems, and has been developed by improving a step thermo system to enable a precise temperature control by suppressing the number of start and stop of each device, and a control method and a control device for the clean room. The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the clean room temperature control method of the present invention is a step thermo-type temperature control in which a plurality of levels are set as a temperature control range including a reference set temperature and an upper limit value and a lower limit value. When it is detected from the content of the signal applied to the control unit that the operation / stop signal of one of the levels is repeatedly transmitted, it is determined that the operation is stable at the level. Then, the indicating controller of the control unit changes the temperature control range set for each level so that the value at the center of the level becomes the target set temperature , based on the changed temperature control range set for each level. It is characterized by performing temperature control.
[0008]
The above-described temperature control method of the present invention is different from a conventional method in which each reference set temperature is fixed, and automatically determines an optimum temperature control range from a signal from a temperature detector, and changes each reference set temperature. By performing the temperature control, the upper limit value and the lower limit value can be increased, and the number of start / stop of each device can be reduced.
[0009]
A second aspect of the present invention relates to an apparatus for performing the above temperature control method, comprising a temperature control mechanism and a temperature adjustment mechanism, wherein the control mechanism includes a cooling coil connected to a refrigerator, a refrigerant heater, a heater, and a feeder. The temperature adjustment mechanism includes a temperature detector and a control unit for receiving air from the room, the control unit includes an indicating controller that detects a signal from the temperature detector, and a reference set temperature and The cooling coil, the refrigerant heater, and the heater are selectively operated by a step thermo method in which a plurality of levels as a temperature control range including an upper limit value and a lower limit value are set , and contents of a signal applied from the temperature detector to the control unit. From the above, when it is detected that the operation / stop signal of one of the levels is repeatedly transmitted, it is determined that the operation is stable at the level, and the instruction adjustment of the control unit is performed. The value of the center of the level allowed changing the temperature control range set for each level so that the set temperature as a target, and to control the temperature based on the temperature control range set to each level was changed to It is characterized.
[0010]
The present invention having the above-described structure, in a step thermo system, includes a cooling coil, a refrigerant reheat coil, and an electric coil as cooling and heating means, and performs temperature control of each temperature control range of the above-described method by selecting these means, By detecting the circulating temperature control range and performing temperature control based on the detected temperature control range, it is not necessary to operate a plurality of temperature control ranges, and the number of start and stop of each device can be reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a temperature control device for a clean room according to the present invention will be described with reference to the drawings.
[0012]
1 to 3 show one embodiment of the present invention. A temperature control device 1 includes a temperature control mechanism 2 and a temperature adjustment mechanism 3. The temperature control mechanism 2 includes a cooling coil 6 connected to the refrigerator 5, a refrigerant reheat coil 7, and an electric heater 8. 9 denotes an air inlet, 10 denotes a temperature detector, and F denotes a blower fan.
[0013]
The temperature adjusting mechanism 3 includes an indicating controller 11 that receives a signal from the temperature detector 10 and a sequencer 12 that performs a search.
[0014]
Next, the control procedure will be described with reference to FIG. The figure uses a step thermo system in which a plurality of temperature control ranges (hereinafter, simply referred to as levels) are combined as the temperature control, and the temperature is shown in the horizontal direction. First, for level 1, a reference value A is set, and a differential (operational clearance) is determined and set to an upper limit value B. The level 1 indicates a temperature at which a command to start / stop the refrigerator 5 is issued. The level 1 is stopped (OFF) when the air temperature reaches point A from a high air temperature, and started (ON) when the low air temperature reaches point B. ).
[0015]
Next, at level 2, the differential is determined and the upper limit D is set with reference to the point C. Level 2 indicates a temperature at which a command to start or stop the operation of the electric heater 8 is issued. The level is activated (ON) when the air temperature reaches point C from a high air temperature, and stopped (OFF) when the air temperature reaches point D from a low air temperature. ).
[0016]
Similarly, for level 3, the differential is determined with reference to the point E, and the upper limit F is set. This level 3 indicates a temperature at which a command to start / stop the operation of the refrigerant reheat is issued. The level 3 is activated (ON) when the air temperature reaches point E, and stopped when the air temperature reaches point F from a low air temperature (OFF). I do.
[0017]
Similarly, the level 4 is set with the reference point G as the reference, and the differential is determined and the upper limit H is set. This level 4 indicates the temperature at which a command to start / stop the unloading (control of the refrigerant capacity) of the refrigerator is issued. Stops when the point is reached (OFF: full load operation).
[0018]
Next, the operation of the temperature adjusting mechanism will be described. First, it is assumed that the level 1 is set in the initial state. At this time, the refrigerator 5 is OFF, and the electric heater 8, the refrigerant reheat, and the unloading of the refrigerator are ON. If the temperature is lower than the point B in this state, the temperature rises because the electric heater 8 and the like are turned on. When the temperature rises to the point B, the refrigerator 5 is turned on . If the temperature still rises, the temperature rises to point D and the electric heater 8 is turned off . Furthermore, if the temperature still rises, the refrigerant reheat is turned off when the temperature rises to the point F, and the unloading of the refrigerator is turned off when the temperature rises to the point H.
[0019]
The temperature rises to a point D, after the electric heater 8 is turned OFF, if the temperature is the temperature point C has been lowered down, the electric heater 8 is turned ON again, the temperature rises. This causes the temperature to circulate at level two.
[0020]
The temperature of these signals is detected by a temperature detector 10, and the signals are sent to an indicating controller 11 in the temperature adjusting mechanism 3. The instruction controller 11 determines the operation / stop of each level from the signal, sends an operation signal to each device, and sends the same signal to the sequencer 12. It should be noted that a so-called personal computer can be used instead of the indicating controller 11 and the sequencer 12.
[0021]
Based on the content of the signal sent from the indicating controller 11, the sequencer 12, when the same signal (one of the operation start / stop signals of any one of the levels ) is repeatedly sent, sends the signal of any level . It is determined that the operation is stable at one of the levels, and the indicating controller 11 changes the temperature control ranges set at the respective levels so that the center value of the level becomes the target set temperature. The temperature control is performed based on the temperature control ranges set for the respective levels.
[0022]
【The invention's effect】
According to the first aspect of the present invention , an optimum temperature control range is automatically determined from a signal from the temperature detector, and each reference set temperature is changed to perform temperature control. is automatically determined and controlled to optimum operating conditions, the upper limit for each level, it is possible to increase the width of the lower limit, it is possible to reduce the number of start-stop of each device. Also, since the target set temperature is always at the center of the circulating level, precise temperature control is also possible.
According to the second aspect of the present invention, since the temperature control mechanism includes the cooling coil connected to the refrigerator, the refrigerant reheat coil, and the electric heater, the temperature control can be performed in three or more stages. In addition, the temperature control uses a step thermo method, the cooling coil, the refrigerant reheat coil, and the electric heater are selectively operated to detect a circulating temperature control range by a sequencer, and the temperature is controlled based on the detected temperature control range. No need to transition to a fixed reference temperature. Accordingly, since only circulation within one temperature control range is required, there is no need to operate various conventional temperature control mechanisms. Further, since the temperature control range can be narrowed, the accuracy of the temperature control can be increased.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing one embodiment of a temperature control device of the present invention.
FIG. 2 is an explanatory diagram of a temperature-temperature adjusting mechanism.
FIG. 3 is an explanatory diagram of a step thermo system.
FIG. 4 is a vertical sectional view showing one embodiment of a conventional temperature control device.
FIG. 5 is an explanatory view showing another embodiment of the conventional temperature control device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 temperature control device 2 temperature control mechanism 3 temperature adjustment mechanism 5 refrigerator 6 cooling coil 7 refrigerant reheat coil 8 electric heater 10 temperature detector 11 indicating controller 12 sequencer

Claims (2)

In step thermo-type temperature control in which a plurality of levels as a temperature control range including a reference set temperature and its upper limit and lower limit are set , one of the levels is determined from the content of a signal applied from the temperature detector to the control unit . When it is detected that the operation / stop signal of one level has been repeatedly transmitted, it is determined that the operation is stable at the level, and the value of the center of the level is set to the target controller of the control unit. A temperature control method comprising: changing a temperature control range set for each level so that a set temperature is obtained, and performing temperature control based on the changed temperature control range set for each level . The control mechanism comprises a temperature control mechanism and a temperature adjustment mechanism, the control mechanism including a cooling coil connected to the refrigerator, a refrigerant heater and a heater, and an air supply fan, and the temperature adjustment mechanism controls the temperature of the incoming air from the room. The control unit includes a detector and a control unit, and the control unit includes an indicating controller that detects a signal from the temperature detector, and sets a plurality of levels as a temperature control range including a reference set temperature and an upper limit value and a lower limit value. The cooling coil, the refrigerant heater and the heater are selectively operated by the step thermo system described above, and the operation / stop signal of one of the levels is determined from the content of the signal applied from the temperature detector to the control unit. Is detected, it is determined that the operation is stable at the level, and the controller at the control unit indicates that the center value of the level becomes the target set temperature. Allowed changing the temperature control range set for each level, the temperature control device being characterized in that to perform the temperature control based on the temperature control range that is set for each level change.

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