JP4388942B2 - Constant temperature and humidity air conditioning method and apparatus - Google Patents

Description

  The present invention relates to a constant temperature and humidity air conditioning method and apparatus suitably used to maintain a constant temperature and humidity in a room such as a clean room, a medical facility, a museum, a storage, etc., and the temperature and humidity are constant with high accuracy. The present invention relates to a constant temperature and humidity air conditioning method and apparatus that can maintain the state and save energy.

  Conventionally, as shown in FIG. 13, an air blower 51, a cooler 52, a heater 53, and a humidifier 54 are arranged in series as an air conditioner 50 for maintaining the air conditioning target room R ′ at constant temperature and humidity. In addition, the thermometer 55 and the hygrometer 56 that are installed in the air conditioning target room R ′ and measure the temperature and humidity of the room air, respectively, and the air temperature immediately after passing through the cooler 52 are measured. A dew point thermometer 60 that controls the output of the humidifier 54 based on the measured value of the hygrometer 56 so that the supplied air meets the humidity conditions of the air-conditioning target room, and the temperature Based on the measured value of the dew point thermometer 60 and the heating amount controller 57 that controls the output of the heater 53 so that the supply air matches the temperature condition of the air-conditioning target room based on the measured value of the total 55. Dew point with supply air set Those composed of cooling amount controller 59 which controls the output of the cooler 52 so as to conform to the degree conditions are known.

  In such a constant temperature and humidity air conditioning method using the conventional air conditioner 50, the supply air supplied to the air conditioner 50 is fixedly set by the cooler 51 regardless of the temperature and humidity state of the air. After the temperature is dehumidified to the dew point (wet bulb) temperature (point B1 ′ in FIG. 2), a predetermined temperature is obtained by the heater 53 and the humidifier 54 based on the measured values of the thermometer 55 and the hygrometer 56. And it is adjusted to humidity and is supplied to the air-conditioning target room R ′.

  Thus, in the conventional air conditioning method, the supply air supplied to the air conditioner 50 is cooled and dehumidified below the predetermined dew point temperature by the cooler 52, so that enormous energy is consumed for this cooling, Energy for heating and humidification by the heater 53 and the humidifier 54 is also increased, and a lot of energy is wasted in the entire system.

In order to solve such a problem, in Patent Document 1 below, an air cooler, an air heater composed of an electric heater, and electric heat in a water tank from an air intake port of an air flow path provided with a blower toward an air supply port. A humidifier equipped with a heater is arranged in this order, and a temperature detector and a humidity detector for the supply air are provided in the vicinity of the air outlet, and based on the detection signal of the temperature detector, the air heater A constant temperature and humidity air supply apparatus comprising: a heater controller that controls operation; and a humidifier controller that controls operation of the humidifier based on a detection signal of the humidity detector, wherein the heater controller and the humidifier The set temperature and humidity output means for converting the target temperature and the target humidity respectively set in the controller into electrical signals and outputting them, and the set temperature and humidity conditions by the input signals from the set temperature and humidity output means. Calculate the dew point of the air A temperature detection signal of a dew point temperature detector for detecting a cooling air temperature of the air cooler, comprising a cooler temperature setting signal generating means for adding a temperature correction for humidification adjustment to output a set cooling temperature of the air cooler, and There is described a constant temperature and humidity air supply device provided with an air cooler controller that compares the output signal from the cooler temperature setting signal generating means and maintains the air cooler at a set temperature by the deviation output. .
Japanese Patent Laid-Open No. 10-288382

  However, in the constant temperature and humidity air supply device described in Patent Document 1, the target temperature and target humidity for controlling the operation of the heater and the humidifier are set based on the detection signals of the temperature detector and the humidity detector. In addition, the dew point of the air is calculated based on the target temperature and the target humidity, and the temperature adjustment for humidification adjustment is added to the calculated dew point to set the set cooling temperature of the air cooler. In addition, the three elements of the target humidity and the set cooling temperature of the air cooler must be controlled independently and at the same time, and advanced numerical analysis is required. In such a case, it may be possible at the laboratory level with a large-scale computer, but it is not suitable for incorporation into a general-purpose programmable logic controller (PLC) used in an actual air conditioning system. It was. Therefore, in order to perform the optimization control of the three elements, a large-scale renovation is required, for example, the general-purpose PLC is completely reconfigured.

  Further, in the constant temperature and humidity air supply device described in Patent Document 1, since the dew point temperature is basically calculated from the temperature and humidity conditions of the supply air, when the indoor sensible heat load is large, the heater The output of No. 2 is in a stopped state or in a state of repeated operation / stop in a short cycle, which makes it impossible to maintain the indoor temperature or adversely affects the operation of the heater.

  Therefore, the main problem of the present invention is that it is possible to reduce the energy consumption of the air conditioner by a simple means that only partially modifies the general-purpose PLC, and it is possible to control the temperature and humidity in the room, and in addition, An object of the present invention is to provide a constant temperature and humidity air conditioning method and apparatus capable of ensuring a stable operation state of a humidifier and a heater and maintaining appropriate control even when the sensible heat load is large.

In order to solve the above-mentioned problem, as the present invention according to claim 1, there is a constant temperature and constant humidity air conditioning method for maintaining an air conditioning target room at a predetermined temperature and humidity,
A blower for blowing supply air to the air-conditioning target room, a cooler arranged in the next stage of the blower to cool the supply air, a heater arranged in a subsequent stage of the cooler to heat the supply air, A humidifier disposed after the cooler for humidifying the supply air, a thermometer and a hygrometer installed in the air-conditioning target room for measuring the temperature and humidity of the room air, respectively, and immediately after passing through the cooler A dew point thermometer that measures the air temperature of the air, a humidification amount controller that controls the output of the humidifier so that the supply air conforms to the humidity condition of the air-conditioned room based on the measurement value of the hygrometer, and A heating amount controller that controls the output of the heater so that the supply air matches the temperature condition of the air-conditioning target room based on the measurement value of the thermometer, and the supply air based on the measurement value of the dew point thermometer Set dew point temperature condition And a cooling amount controller for controlling an output of the cooler such that if,
The cooling amount controller variably sets a dew point temperature under a condition in which the humidifier maintains a predetermined output that is arbitrarily set, and the cooler controls the cooler so that supply air matches a set value of the dew point temperature. When the output of the heater falls below a preset lower limit output value, the heater maintains a predetermined output that is arbitrarily set in preference to the dew point temperature set value. There is provided a constant temperature and humidity air conditioning method characterized in that the second dew point temperature set value calculated under the conditions is adopted and the output of the cooler is controlled so as to conform to the second dew point temperature set value. .

  In the present invention as set forth in claim 1, the dew point temperature set value, which has conventionally been fixedly set, is variably controlled. At this time, when the dew point temperature is variably set, the dew point temperature is basically variably set under the condition that the humidifier maintains a predetermined output arbitrarily set, for example, 15 to 20% of the humidifier capacity. The output of the cooler is controlled so that the supply air matches the set value of the dew point temperature. Accordingly, excessive cooling by the cooler is suppressed, energy consumption of the air conditioner can be reduced, and the room is maintained at a predetermined temperature and humidity.

  On the other hand, for example, when the sensible heat load in the room is large, the operation state of the heater is an operation state in which the operation state of the heater is repeatedly stopped or turned on / off even if the operation state of the humidifier can be constantly maintained. Therefore, the second dew point temperature setting value is calculated under the condition that the heater maintains the set predetermined output, and the output of the heater is a preset lower limit output value ( For example, when the temperature falls below 10% of the heating capacity, the second dew point temperature setting value is adopted in preference to the dew point temperature setting value, and the cooler is adjusted so as to conform to the second dew point temperature setting value. The output was controlled.

  Therefore, since the operation state of the humidifier is constantly maintained and the operation state of the heater can be constantly maintained, the humidifier and the heater can be maintained in any sensible heat load state. It becomes possible to eliminate the instability of the operation state and maintain the room at a predetermined temperature and humidity. Further, in the case of this method, since the setting of the dew point temperature is simple, it can be realized by a simple means that only partially modifies the general-purpose PLC incorporated in the actual air conditioning system.

  In this method, in setting the dew point temperature, the operation state of the humidifier is mainly maintained, and the operation state of the heater is maintained, but this is considered to be optimal when the actual operation is considered. This is because the dew point temperature was mostly low in temperature.

  According to a second aspect of the present invention, in the variable setting of the dew point temperature, the stepwise change is performed based on the output of the humidifier and the rate of change of the humidifier output. The described temperature and humidity control method is provided.

  In the present invention described in claim 2, the variable setting of the dew point temperature is performed stepwise based on the output of the humidifier and the rate of change of the humidifier output. Specifically, as shown in FIG. 5 to be described later, for each zone divided according to the output of the humidifier, the change amount of the dew point temperature set value is determined in consideration of the change rate of the humidifier output. It is desirable to make incremental changes step by step.

  As the present invention according to claim 3, the cooler output at the time of adopting the dew point temperature and the cooler output at the time of employing the second dew point temperature are obtained in parallel, and when the dew point temperature is employed, the second dew point is used. The cooler output when the temperature is adopted is synchronized with the cooler output when the dew point temperature is adopted. When the second dew point temperature is adopted, the cooler output when the dew point temperature is adopted is changed to the cooler output when the second dew point temperature is adopted. The constant temperature and humidity air conditioning method according to any one of claims 1 and 2, wherein the dew point temperature set value is synchronized with the dew point temperature measurement value in preference to the variable setting of the dew point temperature. .

  According to the third aspect of the present invention, when the dew point temperature set value is switched to the second dew point temperature set value and when the second dew point temperature set value is switched to the dew point temperature set value, the manipulated variable (control amount) This prevents the room temperature and the room humidity from becoming unstable due to a sudden change in the temperature.

  Specifically, the sudden change in the manipulated variable (control amount) is caused by the difference between the cooler output when the dew point temperature is adopted and the cooler output when the second dew point temperature is adopted at the time of switching. When the dew point temperature is adopted, the cooling output when the other dew point temperature is adopted is synchronized with the cooling output when one dew point temperature is adopted, and when the other dew point temperature is adopted, the cooling output when one dew point temperature is adopted is It is based on synchronizing with the cooling output when the dew point temperature is adopted. When the second dew point temperature is adopted, the dew point temperature setting value is synchronized with the dew point temperature measurement value so that there is no difference in the dew point temperature setting value when the dew point temperature is subsequently adopted.

  According to a fourth aspect of the present invention, the PID control is performed on the cooler output when the dew point temperature is adopted and the second dew point temperature is adopted, and the change amount of the cooler output is limited. , 2 is provided.

  In the present invention as set forth in claim 4 as well, an operation amount (control amount) at the time of switching from the dew point temperature setting value to the second dew point temperature setting value and at the time of switching from the second dew point temperature setting value to the dew point temperature setting value. This prevents the room temperature and the room humidity from becoming unstable due to sudden changes.

  Specifically, PID control is performed on the cooler output when the dew point temperature is adopted and the second dew point temperature is adopted, and the change in the cooler output is limited, thereby gradually changing the cooling output. Thus, although there is a slight time delay, the room is maintained at a predetermined temperature and humidity. In addition, in the case of this method, since the change amount of the cooler output is limited, it becomes impossible to cope with the sudden change of the operation amount due to disturbance, but there is an advantage that the function of the cooling amount controller can be simplified.

As the present invention according to claim 5, a constant temperature and humidity control device for maintaining the air conditioning target room at a predetermined temperature and humidity,
A blower for blowing supply air to the air-conditioning target room, a cooler arranged in the next stage of the blower to cool the supply air, a heater arranged in a subsequent stage of the cooler to heat the supply air, A humidifier disposed after the cooler for humidifying the supply air, a thermometer and a hygrometer installed in the air-conditioning target room for measuring the temperature and humidity of the room air, respectively, and immediately after passing through the cooler A dew point thermometer that measures the air temperature of the air, a humidification amount controller that controls the output of the humidifier so that the supply air conforms to the humidity condition of the air-conditioned room based on the measurement value of the hygrometer, and A heating amount controller that controls the output of the heater so that the supplied air meets the temperature condition of the air-conditioning target room based on the measured value of the thermometer, and a specified output in which the humidifier is arbitrarily set Dew point temperature under conditions to maintain Variably set and control the output of the cooler so that the supply air conforms to the set value of the dew point temperature, and if the output of the heater falls below a preset lower limit output value, the dew point temperature setting In preference to the value, the second dew point temperature set value calculated under the condition that the heater maintains a predetermined output arbitrarily set is adopted, and the second dew point temperature set value is adapted to the second dew point temperature set value. There is provided a constant temperature and humidity air conditioner comprising a cooling amount controller for controlling the output of the cooler.

  As described above in detail, according to the present invention, the energy consumption of the air conditioner can be reduced and the temperature and humidity in the room can be controlled by a simple means which only partially modifies the general-purpose PLC. Therefore, even when the sensible heat load in the room is large, it is possible to secure a stable operation state of the humidifier and the heater and maintain appropriate control.

[First embodiment]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual diagram of a constant temperature and humidity air conditioner 1 (hereinafter referred to as “air conditioner 1”) according to the present invention.
As shown in FIG. 1, the air conditioner 1 is suitable for supplying air and / or outside air from the air conditioning target room R as supply air in order to maintain the air conditioning target room R at predetermined temperature conditions and humidity conditions. The temperature and humidity are adjusted, and the air-conditioning target room R is blown.

  The air conditioner 1 is arranged in a subsequent stage of the blower 2 for blowing the supplied air to the air-conditioning target room R, a cooler 3 arranged at the next stage of the blower 2 and cooling the supplied air. A heater 4 that heats the supply air, a humidifier 5 that is disposed downstream of the cooler 3 and humidifies the supply air, and a temperature that is installed in the air-conditioning target room R and measures the temperature and humidity of the room air, respectively. Based on the measured value of the hygrometer 7 based on the measured value of the hygrometer 7 and the dew point thermometer 14 that measures the air temperature immediately after passing the cooler 3 A humidification amount controller 8 that controls the output of the humidifier 5 so as to be suitable, and the heater 4 so that the supplied air matches the temperature condition of the air-conditioning target room R based on the measured value of the thermometer 6. Heating amount controller 9 for controlling the output of the dew point and the dew point temperature And a cooling amount controller for controlling an output of the cooler 3 to match the dew point temperature set value supplied air is set based on the measured value of 14.

  Further, the cooling amount controller variably sets the dew point temperature under the condition that the humidifier 5 maintains a predetermined output that is arbitrarily set, so that the supply air matches the set value of the dew point temperature. The second dew point temperature is calculated under the condition that the first (reference) cooling amount controller 11 that controls the output of the cooler 3 and the heater 4 maintains the set output, and this second dew point is calculated. And a second cooling amount controller 12 for controlling the output of the cooler 3 so as to conform to the temperature set value.

  In the subsequent stage of the first cooling amount controller 11 and the second cooling amount controller 12, the first cooling amount control is performed when the humidifier 5 maintains an arbitrarily set output. When the output of the heater 4 falls below a preset lower limit output value, in order to operate the cooler 3 at the second dew point temperature in preference to the dew point temperature set value, A switcher 13 for switching is provided on the second cooling amount controller 12 side.

  Next, a constant temperature and humidity control method for the air conditioning target room R using the air conditioning apparatus 1 will be described in detail. In this air conditioning method, the dew point temperature set value, which has been fixedly set in the past, is variably controlled. At this time, when the dew point temperature is variably set, the dew point temperature is basically variably set under the condition that the humidifier 5 maintains a predetermined output arbitrarily set, for example, 15 to 20% of the humidifier capacity. The output of the cooler 3 is controlled so that the supply air matches the set value of the dew point temperature.

  On the other hand, for example, when the sensible heat load in the room is large, the operation state of the heater is an operation state in which the operation state of the heater is repeatedly stopped or turned on / off even if the operation state of the humidifier can be constantly maintained. Therefore, the second dew point temperature setting value is calculated under the condition that the heater maintains the set predetermined output, and the output of the heater is a preset lower limit output value ( For example, when the temperature falls below 10% of the heating capacity, the second dew point temperature setting value is adopted in preference to the dew point temperature setting value, and the cooler is adjusted so as to conform to the second dew point temperature setting value. The output was controlled.

  The case where the output of the cooler 3 is controlled by the first cooling amount controller 11 will be described in detail based on the air diagram of FIG.

  In the conventional air-conditioning method, as indicated by point A-B1'-C1'-D1 in FIG. 2, the air in the air-conditioned room R at the state point A is sufficiently fixed by the cooler from the dew point temperature. After cooling to the state of the low point B1 ′, it is heated to the state of point C1 ′ by a heater, further humidified to the state of point D1 by a humidifier and supplied to the room, and then the room is heated by the sensible heat load in the room. The state of point A was maintained. For this reason, in addition to the energy for cooling to the state of dew point temperature point B1 'fixedly set by the cooler, it is heated to the state of point C1' by the heater and humidified to the state of point D1 by the humidifier. Because much energy was consumed.

  On the other hand, in this air conditioning method, as shown by point A-B1-C1-D1 in the figure, the dew point temperature by the cooler 3 is variably set as point B1. For this reason, it is possible to reduce the heating amount heated to the point C1 by the heater 4 and the humidifying amount humidified to the point D1 by the humidifier 5. Thereby, energy saving of the whole air conditioner can be realized.

  In the variable setting of the dew point temperature, based on the output of the humidifier 5 and the rate of change of the humidifier output, the dew point temperature is calculated under the condition that the humidifier 5 maintains an arbitrarily set predetermined output. , I am trying to make gradual changes.

  Specifically, as shown in FIG. 4, the variable setting of the dew point temperature is set for each zone divided according to the output of the humidifier 5 in consideration of the rate of change of the humidifier output. The amount of change in the value is determined, and a gradual change is made. To give a more specific example, as shown in FIG. 5, the output of the humidifier 5 is divided into five categories, for example, 10% or less, 10-15%, 15-20%, 20-25%, 25% or more. For each zone, taking into account the rate of change of the humidifier output, for example, around ± 1% / min, the change in dew point temperature setting value is unchanged (± 0), slightly increased or decreased (+ 0.2 ° C or -0.2 ° C), increase or decrease (+ 0.5 ° C or -0.5 ° C), etc., and gradually change in steps.

  As described above, the variable setting of the dew point temperature is obtained based on the output of the humidifier 5 and the change rate of the humidifier output, so that the humidifier 5 can maintain a predetermined output state and cooling by the cooler can be performed. The energy consumption of the cooler, the heater, and the humidifier can be reduced by the amount of “reduction amount” shown in FIG.

  On the other hand, FIG. 3 shows the output of the cooler 3 by the second cooling amount controller 12 when the sensible heat load in the room is large and the output of the heater 4 falls below a preset lower limit output value. It is an air line figure in the case of controlling.

  In the case where the dew point temperature is variably set under the condition that the humidifier 5 maintains a predetermined output that is arbitrarily set, as shown in FIG. 3, for example, when the sensible heat load in the room is large, If the dew point temperature (point B1) is calculated under the condition that the humidifier 5 maintains the specified output set arbitrarily, even if the operating state of the humidifier 5 can be maintained constantly, heating Since the operation of the heater 4 becomes unnecessary or becomes extremely small, it is assumed that the operation state of the heater is in an operation state in which the operation state is frequently stopped or turned on and off, and the indoor temperature becomes unstable.

  Therefore, in this air conditioning method, the output of the heater 4 (point B1-point C1) falls below a preset lower limit output value (for example, 10% of the heating capacity) due to a large sensible heat load in the room. In this case, the second dew point temperature setting value (B2) is used in preference to the dew point temperature setting value (B1) in order to maintain the output of the heater 4 above a predetermined value. The output of the cooler 3 is controlled so as to meet the value (B2).

  In addition, as a control method of the cooling amount of the cooler 3, it can be performed by adjusting a cooling valve 10 for cooling water as shown in FIG.

  By the way, at the time of switching from the dew point temperature setting value to the second dew point temperature setting value and at the time of switching from the second dew point temperature setting value to the dew point temperature setting value, the room temperature and the room are changed due to a sudden change in the manipulated variable (control amount). The problem of destabilizing humidity can occur.

  Therefore, in the present air conditioner 1, when the dew point temperature setting value is switched to the second dew point temperature setting value and when the second dew point temperature setting value is switched to the dew point temperature setting value, the manipulated variable (control amount) changes suddenly. Therefore, a tuning method is provided so that the room temperature and the room humidity are not unstable.

  In the first tuning method, as shown in FIG. 6, the output of the cooler 3 when the dew point temperature is adopted and the output of the cooler 3 when the second dew point temperature are adopted are obtained in parallel. The output of the cooler 3 when the dew point temperature is employed is determined when the output of the cooler 3 falls below a preset lower limit output value. It is tuned to the output of the cooler 3.

  On the other hand, when the output of the heater 4 falls below a preset lower limit output value, the second dew point temperature is adopted, and the output of the cooler 3 when the dew point temperature is adopted is cooled when the second dew point temperature is adopted. The dew point temperature is tuned to the dew point temperature measurement value in preference to the variable setting of the dew point temperature.

  Specifically, the first tuning method will be described in detail with reference to FIGS. FIG. 7 shows a case where the output of the heater 4 does not fall below a preset lower limit output value, that is, when a dew point temperature is employed. In this case, the output of the cooler 3 is PID controlled by the first cooling amount controller 11. In the first cooling amount controller 11, the dew point temperature is variably set under the condition that the humidifier 5 maintains an arbitrarily set specified output, and the supply air is set to the set value of the dew point temperature (SP = in the illustrated example). The operation amount of the cooler 3 (MV = 70% in the illustrated example) is controlled so as to conform to (10 ° C.). This cooler operation amount (MV = 70%) is input to the second cooling amount controller 12 through the switch 20, and the second cooling amount controller 12 maintains the specified output set by the heater 4. The second dew point temperature is calculated under the above conditions. Instead of this calculated value, the cooler operation amount (MV = 70%) calculated by the first cooling amount controller 11 is sent to the switcher 13.

  As described above, by adjusting the output of the cooler 3 when the second dew point temperature is adopted to the output of the cooler 3 when the dew point temperature is adopted, the first cooling amount controller 11 controls the second cooling amount control. Even when switching to the container 12, the operation amount output by both at the timing is adjusted to be the same, so that the room temperature and the room humidity can be prevented from becoming unstable at the time of switching.

  On the other hand, FIG. 8 shows a case where the output of the heater 4 falls below a preset lower limit output value, that is, when the second dew point temperature is employed. In this case, the output of the cooler 3 is PID-controlled by the second cooling amount controller 12. The second cooling amount controller 12 controls the operation amount (MV = 40% in the illustrated example) of the cooler 3, and this operation amount (MV = 40%) passes through the switch 21 and passes through the first cooling amount controller. 11, the first cooling amount controller 11 calculates the dew point temperature under the condition that the humidifier 5 maintains the set output, but the second cooling amount is replaced with this calculated value. The cooler operation amount (MV = 40%) calculated by the controller 12 is sent to the switcher 13. Further, the first cooling amount controller 11 switches the switcher 22 to the dew point thermometer 14 side so that there is no difference in the dew point temperature setting value when switching to adopting the dew point temperature thereafter, and sets the dew point temperature setting value. Is tuned to the measured value SP = 11 ° C. from the dew point thermometer 14 in preference to the variable setting.

  As described above, the output of the cooler 3 when the dew point temperature is adopted is synchronized with the output of the cooler 3 when the second dew point temperature is adopted, and the dew point temperature is given priority over the variable setting of the dew point temperature. By synchronizing with the temperature measurement value, even when the second cooling amount controller 12 is switched to the first cooling amount controller 11, the operation amount output by both at the timing is adjusted to be the same. Therefore, it is possible to prevent the indoor temperature and the indoor humidity from becoming unstable at the time of switching.

  Next, as shown in FIG. 9, the second tuning method is when switching from the dew point temperature setting value to the second dew point temperature setting value, and when switching from the second dew point temperature setting value to the dew point temperature setting value. 1, both the first cooling amount controller 11 and the second cooling amount controller 12 are PID controlled so that the room temperature and the room humidity are not destabilized by a sudden change in the operation amount, and the change amount of the output of the cooler 3 The restriction is added to In the illustrated example, when the operation amount of the cooler 3 is controlled by the second cooling amount controller 12 at MV = 40%, the first cooling amount control is performed at the time of switching to the first cooling amount controller 11 thereafter. The change rate of the operation amount is limited to 1.0% / min or less so that the operation amount MV = 20% of the cooler 3 by the cooler 11 is not changed suddenly, so that the cooling output is gradually changed. .

  Thereby, although there is a slight time delay, there is no sudden change in the operation amount (control amount), and the room is maintained at a predetermined temperature and humidity.

[Second embodiment]
The air conditioner 1 according to the second embodiment of the present invention shown in FIG. 10 is obtained by making the control mechanism shown in FIG. 1 a cascade control system. As shown in the figure, a controller 16 that includes a thermometer 15 that measures the air temperature immediately after passing through the heater 4 and controls the output of the heater 4 based on the measured value of the thermometer 15 is provided. It is provided. Thereby, the relative relationship between the output of the heater 4 and the air temperature can be obtained, the influence of disturbance is reduced, and more stable temperature control of the air-conditioned room R is possible.

  As shown in Fig. 2, the consumption of the air conditioner when operated by the conventional air conditioning method represented by the air diagram of point A-B1'-C1'-D1 and when operated by the air conditioning method of the present application Time series changes in electric power and temperature and humidity in the air-conditioned room R were measured. As a result, after switching to the air-conditioning method of the present application, as shown in FIG. 11, the power consumption of the air conditioner 1 changes from about 15 kW to about 11.5 kW on average, enabling about 25% energy reduction. As shown in FIG. 12, variations in temperature and humidity can be reduced.

[Other examples]
(1) In the above embodiment, the cooling amount controller variably sets the dew point temperature under the condition that the humidifier 5 maintains a predetermined output that is arbitrarily set, and the supply air is a set value of the dew point temperature. The first (reference) cooling amount controller 11 that controls the output of the cooler 3 so as to conform to the above, and the second dew point temperature setting calculated under the condition that the heater 4 maintains the specified output set. Two cooling amount controllers such as a second cooling amount controller 12 for calculating the value and controlling the output of the cooler 3 so as to conform to the second dew point temperature setting value are provided, and the first cooling amount is provided at the subsequent stage. Although the switching device 13 serving as a selection unit of the controller 11 and the second cooling amount controller 12 is provided, a single cooling amount controller may be provided under the condition of including an arithmetic comparator. In this case, the arithmetic comparator has a function of variably setting a dew point temperature under a condition in which the humidifier 5 maintains a predetermined output that is arbitrarily set, and a predetermined output in which the heater 4 is set. The function of calculating the second dew point temperature under the condition of maintaining the temperature and whether or not the output of the heater 4 falls below a preset lower limit output value, and if not lower, adopt the dew point temperature. When the value falls below the lower limit output value, the second dew point temperature may be selected, and the selected dew point temperature set value may be sent to the cooling amount controller.

1 is a conceptual diagram of an air conditioner 1 according to the present invention. FIG. 5 is an air diagram when the output of the cooler 3 is controlled by the first cooling amount controller 11. It is an air diagram in case the output of the cooler 3 is controlled by the 2nd cooling amount controller 12. FIG. It is a figure which shows the relationship between the output state of the humidifier 5 in case the output of the cooler 3 is controlled by the 1st cooling amount controller 11, and the variation | change_quantity of a dew point temperature setting value. It is a figure which shows the specific example of the relationship between the output state of the humidifier 5 in case the output of the cooler 3 is controlled by the 1st cooling amount controller 11, and the variation | change_quantity of a dew point temperature setting value. It is a flowchart which shows the operation procedure of a 1st tuning means. It is a conceptual diagram which shows the control state at the time of dew point temperature adoption concerning the 1st tuning means. It is a conceptual diagram which shows the control state at the time of employ | adopting the 2nd dew point temperature which concerns on a 1st tuning means. It is a conceptual diagram which shows the control state of a 2nd tuning means. It is a conceptual diagram of the air conditioner 1 which concerns on the 2nd form example of this invention. It is a graph which shows the time-sequential change of the power consumption before and behind changing from the conventional air-conditioning method to this-application air-conditioning method. It is a graph which shows the time-sequential change of the temperature and humidity in the air-conditioning target room R before and after changing from the conventional air conditioning method to the present air conditioning method. It is a conceptual diagram of the conventional air conditioner 50.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Constant temperature and humidity air conditioner, 2 ... Blower, 3 ... Cooler, 4 ... Heater, 5 ... Humidifier, 6 ... Thermometer, 7 ... Hygrometer, 8 ... Humidification amount controller, 9 ... Heating amount controller DESCRIPTION OF SYMBOLS 10 ... Cooling water valve, 11 ... 1st cooling amount controller, 12 ... 2nd cooling amount controller, 13 ... Switching device, R ... Air-conditioning object room

Claims (5)

A constant temperature and humidity control method for maintaining a room to be air-conditioned at a predetermined temperature and humidity,
A blower for blowing supply air to the air-conditioning target room, a cooler arranged in the next stage of the blower to cool the supply air, a heater arranged in a subsequent stage of the cooler to heat the supply air, A humidifier disposed after the cooler for humidifying the supply air, a thermometer and a hygrometer installed in the air-conditioning target room for measuring the temperature and humidity of the room air, respectively, and immediately after passing through the cooler A dew point thermometer that measures the air temperature of the air, a humidification amount controller that controls the output of the humidifier so that the supply air conforms to the humidity condition of the air-conditioned room based on the measurement value of the hygrometer, and A heating amount controller that controls the output of the heater so that the supply air matches the temperature condition of the air-conditioning target room based on the measurement value of the thermometer, and the supply air based on the measurement value of the dew point thermometer Set dew point temperature condition And a cooling amount controller for controlling an output of the cooler such that if,
The cooling amount controller variably sets a dew point temperature under a condition in which the humidifier maintains a predetermined output that is arbitrarily set, and the cooler controls the cooler so that supply air matches a set value of the dew point temperature. When the output of the heater falls below a preset lower limit output value, the heater maintains a predetermined output that is arbitrarily set in preference to the dew point temperature set value. A constant temperature and humidity air conditioning method characterized by adopting a second dew point temperature set value calculated under conditions and controlling the output of the cooler so as to conform to the second dew point temperature set value.   2. The constant temperature and humidity control method according to claim 1, wherein the variable setting of the dew point temperature is gradually changed based on the output of the humidifier and the rate of change of the humidifier output. 3.   The cooler output when the dew point temperature is employed and the cooler output when the second dew point temperature are employed are obtained in parallel. When the dew point temperature is employed, the cooler output when the second dew point temperature is employed is determined as the dew point. When the second dew point temperature is employed, the cooler output when the second dew point temperature is employed is synchronized with the cooler output when the second dew point temperature is employed, and the dew point temperature is variable. 3. A constant temperature and humidity air conditioning method according to claim 1, wherein the dew point temperature set value is synchronized with the dew point temperature measurement value in preference to the setting.   The constant temperature and constant temperature according to any one of claims 1 and 2, wherein PID control is performed on the cooler output when the dew point temperature is employed and the second dew point temperature is employed, and the amount of change in the cooler output is limited. Wet air conditioning method. A constant temperature and humidity air conditioner for maintaining the air conditioning target room at a predetermined temperature and humidity,
A blower for blowing supply air to the air-conditioning target room, a cooler arranged in the next stage of the blower to cool the supply air, a heater arranged in a subsequent stage of the cooler to heat the supply air, A humidifier disposed after the cooler for humidifying the supply air, a thermometer and a hygrometer installed in the air-conditioning target room for measuring the temperature and humidity of the room air, respectively, and immediately after passing through the cooler A dew point thermometer that measures the air temperature of the air, a humidification amount controller that controls the output of the humidifier so that the supply air conforms to the humidity condition of the air-conditioned room based on the measurement value of the hygrometer, and A heating amount controller that controls the output of the heater so that the supplied air meets the temperature condition of the air-conditioning target room based on the measured value of the thermometer, and a specified output in which the humidifier is arbitrarily set Dew point temperature under conditions to maintain Variably set and control the output of the cooler so that the supply air conforms to the set value of the dew point temperature, and if the output of the heater falls below a preset lower limit output value, the dew point temperature setting In preference to the value, the second dew point temperature set value calculated under the condition that the heater maintains a predetermined output arbitrarily set is adopted, and the second dew point temperature set value is adapted to the second dew point temperature set value. A constant temperature and humidity air conditioner comprising a cooling amount controller for controlling the output of the cooler.

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