JPS6223217B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method of controlling an air conditioner. Conventional air conditioners (hereinafter referred to as air conditioners) either set a temperature that is considered comfortable for humans during cooling operation as shown in Figure 1, and perform constant temperature control using this as a target value. As shown in Figure 2, the indoor atmosphere was controlled by repeatedly operating the air conditioner J and dehumidifier K using ON-OFF control. Conventional air conditioners of this type perform control that focuses only on temperature and do not control humidity, and therefore cannot satisfy human comfort conditions determined by the relative relationship between temperature and humidity. Nakatsuta. Therefore, the present invention controls both the temperature and the related humidity, and when controlling the temperature and humidity, the air conditioner is operated so as to perform control according to the indoor load characteristics in the indoor temperature state before air conditioning operation. The purpose of the present invention is to provide a control method that satisfies human comfort conditions by automatically determining the control mode. The feature of the present invention is to set a certain determination reference temperature determined by the operating capacity of the air conditioner and the indoor load conditions, and to compare whether the room temperature before the start of operation is higher or lower than the determination standard, to control the temperature and humidity control operation mode. The system automatically determines the air conditioner and operates the air conditioner as a result.
Hereinafter, the present invention will be explained with reference to illustrative examples. FIG. 3 is a conceptual diagram of an air conditioning system according to the present invention. In the figure, TD is a temperature sensor using a temperature sensing resistor such as a thermistor, and HD is a humidity sensor using a humidity sensing resistor such as lithium chloride, both of which have negative resistance characteristics. THC is a temperature and humidity control device used in the present invention, and ACM is an air conditioner main body. Next, FIG. 4 shows the operation control characteristics of the temperature and humidity control device THC. First, with reference to _FIG .
temperature range is set. Further, for humidity, a humidity range is set based on a target humidity H _s (hereinafter referred to as set humidity) and a higher value of the operation return humidity H _s '. These temperature and humidity ranges are set based on human comfort conditions determined by the relative relationship between temperature and humidity. Therefore, the optimum temperature and humidity that satisfies the comfort conditions is the area G formed by the intersection of the straight lines of the set temperature T _s ±α and the set humidity H _s and H _s ′.
It is indicated by. Furthermore, the determination reference temperature t _b is set at a point higher than the set temperature T _s by t _x (t _b =
_Ts + _tx ). Details of this t _b will be described later. Now, the load characteristics of the room to be air-conditioned are the insulation properties of the room,
It varies depending on factors such as airtightness, the size of the indoor space, and the presence or absence of heat sources (including humans) in the room. However, here, standard load characteristics are fixed for each appropriate level of indoor space size (for example, 6 tatami mats, 8 tatami mats, etc.). Therefore, the standard indoor load line l _R is shown with a predetermined slope as shown in FIG. However, this load line l _R moves in parallel, for example, as shown by the broken line, depending on the value of the set temperature T _s . In FIG. 5, C _h indicates the cooling capacity value of the air conditioner ACM in the cooling operation at each room temperature _TR , and C _l indicates _the cooling capacity value in the cool dehumidification operation at each room temperature _TR . Consider _l to be a fixed value that is not related to room temperature T _R . Now, assuming that the room temperature before the start of operation is at t _a , the set value t is calculated from this t _a
In order to cool down to _s , the minimum cooling capacity value at point a on the load line l _R corresponding to t _a is required.
In other words, the cooling capacity value at point a matches the cooling capacity value C _h of the air conditioner, so if the room temperature without air conditioning is t _a , if the air conditioner is in cooling operation, the room temperature will drop from t _a . Finally, the balance is reached at the set value T _s . Therefore, t _a is the upper limit of the room temperature without air conditioning that can reach the set value T _s through cooling operation. Also,
If the room temperature without air conditioning is t _b , if the operation is performed with the cooling capacity value C _l at point b on the load line l _R corresponding to this t _b , that is, if the air conditioner is operated in cold dehumidifying operation, The room temperature eventually balances at the set value T _s .
Therefore, t _b is the upper limit of the room temperature without air conditioning that can reach the set value through the cold dehumidification operation. From this, if the room temperature without air conditioning is higher than t _b (assuming it is lower than t _a ), if the room temperature reaches the set value T _s and further cooling operation is performed, the room temperature will decrease. However, if you switch to cold dehumidification mode, the room temperature will rise. Therefore, in this case, if the operation control mode after reaching the set value is an alternate operation of "cooling and cool dehumidification", the room temperature will be dehumidified while being maintained near the set value _Ts , and a comfortable humidity will be reached. It becomes possible to do so. However, even if the room temperature is higher than t _b before the start of operation, the load characteristics inside the room change due to subsequent weather changes, and the room temperature may drop even during cool dehumidification operation. In such a case, the mode judgment based on the room temperature before the start of operation is no longer applicable, so an operation control mode suitable for this case, such as "cold air dehumidification and ventilation", is alternately repeated. In short, if the room temperature during non-air conditioning is higher than t _b , the operation control mode will be an alternating operation of "cooling and cold dehumidification" unless circumstances change later. On the other hand, if the room temperature remains below t _b when there is no air conditioning, if the room temperature reaches the set value T _s and further cool dehumidification or cooling operation is performed, the room temperature will decrease and warm dehumidification operation will be performed. If you switch, the room temperature will rise. Therefore, in this case, if the operation control mode after reaching the set value is to alternate between cooling and warm dehumidification, it is possible to control the humidity to a comfortable value while keeping the room temperature near the set value. Become. From the above, the temperature t _b corresponding to the intersection point b between the line of the cooling capacity C _l and the load line l _R in the cold dehumidification operation can be used as the reference temperature for distinguishing between the two control modes described above. Thus, air conditioner ACM is determined based on the given discrimination reference temperature t _b .
The control operation mode is selected. Next, before going into the explanation of the embodiments of the present invention, basic well-known matters regarding air conditioner operation will be explained in the 10th and 11th sections.
This will be explained with reference to the figure. FIG. 10 is a refrigeration cycle diagram of the air conditioner. As shown in the figure, compressor CM, outdoor heat exchanger HE ₃ , first pressure reducing device PR ₁ , first indoor heat exchanger
HE ₁ , second pressure reducer PR ₂ and second indoor heat exchanger
HE ₂ is connected by a refrigerant pipe to form a refrigeration cycle. An outdoor fan FM ₂ is provided for the outdoor heat exchanger HE ₃ . Indoor heat exchanger HE ₁ , HE ₂
An indoor fan FM ₁ will be provided for. The indoor air is transferred to the second indoor heat exchanger HE ₂ by the indoor fan FM ₁ .
It is taken in from the side and sent out from the first indoor heat exchanger _HE1 side. Further, the pressure reducing devices PR ₁ and PR ₂ are each provided with a bypass path, and this bypass path is opened and closed by a cooling valve SV ₁ and a dehumidification valve SV ₂ , respectively. FIG. 11 is a chart showing the relationship between the operation mode of this air conditioner and the operation of each device. In the case of cooling operation, both the outdoor fan FM ₂ and the indoor fan FM ₁ are driven, the cooling valve SV ₁ is opened, and the dehumidification valve SV ₂ is closed. In other words, the refrigerant flows along the path indicated by the solid arrow in FIG. Therefore, cooling takes place in both the first indoor heat exchanger HE ₁ and the second indoor heat exchanger HE ₂ , and the cold air is sent directly into the room. In the case of dehumidification (including both cold and warm temperatures), cooling valve SV ₁ opens, and dehumidification valve SV ₂ opens.
is closed, and the refrigerant flows along the path indicated by the dashed arrow. Therefore, the air is once cooled and dehumidified in the second indoor heat exchanger HE ₂ , and then transferred to the first indoor heat exchanger HE ₁ .
While passing through the room, it is heated and sent into the room. The difference between cold and warm dehumidification is whether the outdoor fan FM ₂ is running or not. In other words, when the air is a little cold, the outdoor fan FM ₂ is rotating, so the heat absorption effect in the second heat exchanger HE ₂ is relatively large, and the air that is a little cold is sent out. In addition, when the weather is warm, the outdoor fan FM ₁ is stopped, so the heat absorption effect is relatively small and warm air is sent out. In the case of blowing air, only the indoor fan FM ₁ is driven to circulate the indoor air. Next, an embodiment of the control method according to the present invention will be described with reference to FIG. [Control mode A] Room temperature T at the start of operation
When _R is higher than the discrimination reference temperature t _b (t _b ≦T
_R ). In this case, cooling starts from point 0 in the 4th figure,
When point 1 of the set temperature T _s is reached, the air conditioner ACM is controlled to perform cold dehumidification operation from point 1 to point 2. When point 2 is reached, cooling operation is switched to, and cooling operation is continued until point 3. When point 3 is reached, the cold dehumidifying operation is started again and the operation is continued until point 4. Thereafter, alternate cycle operation of "cooling" and "cold dehumidification" is performed in the same manner until the humidity reaches the set value _Hs .
Operation is stopped at point 5 when H _s is reached. [Control mode A ₁ ] The operation start condition in this case is the same as the previous control mode A, but the start condition (T
Even when it is determined that the control mode is A based on _R ≧t _b , there is a possibility that the room temperature T _R decreases due to the cold dehumidification operation. For example, if the indoor load characteristics change due to changes in the weather after the start of operation, mode A based on the room temperature before the start of operation can no longer be applied. The mode for this exceptional case is _A1 . That is, when point 1 is reached, cold dehumidification operation begins, and the room temperature T _R decreases to reach point 2''.Point 2''
At , the air blowing operation is switched to the point 3'', and the operation is continued until the point 3''.When the point 3'' is reached, the operation is switched to the cold dehumidifying operation again, and the operation is continued until the point 4'_' .
Alternate cycle operation of "cold dehumidification" and "air blowing" is performed until H _s is reached, and operation is stopped at point 5''. [Control mode B] Room temperature T at the start of operation
When _R is lower than the discrimination reference temperature t _b (T _R <t
_b ). In this case, cooling starts from point 0' in Figure 4, and when the set temperature T _s reaches point 1, the air conditioner ACM
is controlled to perform warm dehumidification operation from point 1 to point 2'. When point 2' is reached, cooling operation is switched to, and operation continues until point 3. When point 3 is reached, warm-up dehumidification operation is performed again until point 4 is reached. Thereafter, alternate cycle operation of "warm dehumidification" and "cooling" is performed in the same manner until the humidity reaches the set value _Hs , and the operation is stopped at point 5' when the humidity reaches _Hs . In any of the above control modes A, A ₁ and B, if the humidity naturally rises to the return humidity H _s ' after the operation is stopped, the above-mentioned operation is restarted according to each control mode. Note that the compressor will not start operating even if the indoor condition changes within the predetermined compressor restart prevention time. Next, an example of the configuration of a temperature/humidity control device for performing the above operation control is shown in FIGS. 6 and 7. Figure 6 shows detection signals from temperature sensor TD and humidity sensor HD.
The main control circuit operates based on V ₁ and V ₄ and outputs control signals corresponding to each control mode A, A ₁ and B. This is an air conditioner control circuit that controls equipment. In the main control circuit shown in Figure 6, the comparator
IC ₁ and IC ₂ are feedback resistors R ₅ and R ₈ and diodes D ₁ and D ₂
Therefore, it has a hysteresis characteristic as shown in FIG. Comparator IC ₃ also resistor R ₁₂ , diode
Due to _D3 , it has a hysteresis characteristic as shown in FIG. Reference input terminal of comparator IC ₁ (
A reference value V _ref1 (corresponding to the temperature T _s ) is given to the reference input terminal of the comparator IC ₂ , a reference value V _ref2 (corresponding to the lower limit temperature T _s −α) is given to the reference input terminal of the comparator IC 2 ,
Further, a reference value V _ref3 ′ (corresponding to the set humidity H _s ) is given to the comparator IC ₃ . These reference values V _r
ef1 , V _ref2 , V _ref3 are the respective comparators IC ₁ , IC ₂ ,
When the outputs V ₂ , V ₃ , and V ₆ of IC ₃ are inverted to L level, they are changed to the values of V' _ref1 , V' _ref2 , and V' _ref3 respectively due to the hysteresis characteristics of each comparator, and the values of these changed values are The voltage level will be lower than before the change. Here, V′ _ref1 is the upper limit temperature T _s +α,
V′ _ref2 is the set temperature T _s (therefore, at this time V′ _ref2 =
V _ref1 and V' _ref3 correspond to the operation return temperature H _s ', respectively. Next, control mode A based on the discrimination reference temperature t _b ,
The determination operation of B will be described. In Figure 6,
When a voltage of +V ₁ is applied by turning on the power,
A charging current flows through the capacitor C ₁ and the resistor R ₁₇ . At this time, R ₁₇ is connected to the input terminal S of the latch circuit LAT.
voltage drop is added. This voltage is initially at H level, and becomes L level as the capacitor is charged. Here, the truth table of the latch circuit LAT is shown in Table 1. This latch circuit LAT is the output of IC ₄ when the S input is at H level (that is, the D input).
Remember. This does not change even if the S input is subsequently inverted to L level. Therefore, when the room temperature T _R at the start of operation is higher than the discrimination reference temperature t _b (t _b ≦
T _R ), that is, when v ₁ is at a lower level than the reference value V _ref4 corresponding to t _b , IC ₄ outputs an H level, which becomes the D input, and the latch circuit LAT stores the H level. Conversely, when _TR is lower than t _b ( _TR < t _b ), that is, when v ₁ is at a higher level than V _ref4 , the output of IC ₄ is inverted and becomes L level, and the latch circuit LAT outputs this L level. Remember.

[Table] The memory output Q of this latch circuit LAT is an OR circuit.
It is input to one terminal of OR ₁ , and the output v ₂ of comparator IC ₁ is input to the other terminal of OR ₁ . Therefore, the driving state of the outdoor fan motor FM ₂ , which determines whether it is cold dehumidification or warm dehumidification, is the OR circuit OR _1.
It depends on the AND condition between the output value of and the relay contact RY ₃ -S. Next, the operation for each control mode will be explained with reference to FIGS. 4, 6, and 7. [Control mode A] Since T _R ≧t _b at point 0, the detection signal v ₁ from the temperature sensor TD
is at L level, which is lower than the reference value V _ref1 , and at this time, the output v ₂ of comparator IC ₁ is at H level,
Transistor switch Q ₁ becomes conductive and relay RY ₁ is energized. By energizing relay RY ₁ its contacts
RY ₁ -S switches to the NO side, and the cooling-dehumidification switching valve becomes the cooling side. Similarly, in the comparator IC ₂ , the detection signal v ₁ is at the L level, which is lower than the reference value V _ref2 , and therefore the output v ₃ is at the H level. This output _v3 is input to one terminal of the AND circuit _AND1 . Furthermore, since the humidity is high at this time, the humidity sensor HD has low impedance.
The detection signal _v4 generated by dividing the AC signal from the oscillation circuit OSC by the resistor _R9 and the humidity sensor HD is at L level. This signal v ₄ is an AC/DC converter
It is converted into a direct current by the REC, and is applied to the detection input terminal (-terminal) of the comparator IC ₃ as a signal _v5 , and compared with the reference value _Vref3 . The comparison output _v6 is at H level and is applied to the output buffer _BUF1 and also to the other terminal of the AND circuit _AND1 .
Due to this v ₆ , both inputs of AND ₁ become H level, so the timer circuit TIM starts operating, and after a predetermined time (compressor CM restart prevention time), output v ₇ is generated and the next AND circuit AND ₂
Output to. Therefore, the inputs of AND ₂ are v ₈ , v ₆ ,
Since all three of v ₇ are at H level, AND output v ₈
turns on transistor Q ₂ and energizes relay RY ₂ . Then, the contact RY ₂ -S is turned on in conjunction, the compressor motor CM starts driving, and the outdoor fan motor FM ₂ becomes ready to be driven. At this time, as mentioned earlier, the latch circuit LAT stores the H level due to the conditions at the start of operation (t _b ≦ T _R ), so the output of the OR circuit OR ₁ is H.
level, transistor _Q4 is ON, relay
RY ₄ is energized, its contact RY ₄ -S turns ON, and the outdoor fan motor FM ₂ rotates. In addition, since the output v ₆ of the comparator IC ₃ is also at H level, the transistor Q ₃ is turned on, the relay RY ₃ is energized, and its contact RY ₃ -S is turned on, so that the indoor fan motor FM ₁ also rotates. In this way, the cooling operation is started from point 0 in FIG. 4, and the set temperature T _s at point 1 is
Operation continues until the Next, when the indoor temperature T _R reaches point 1, the temperature detection signal v ₁ becomes an H level equal to or higher than the reference value V _ref1 , and the output v ₂ of the comparator IC ₁ is inverted to an L level. This reversal of v ₂ turns off the transistor Q ₁ , switches the relay contact RY ₁ -S to the NC side, and switches the dehumidification valve SV ₂ . However, at this time, the level of the temperature detection signal v ₁ has not reached the reference value V _ref2 of the comparator IC ₂ , so Q ₂ , Q ₃ , and Q ₄ except the transistor Q ₁ are all ON, and therefore the relay Contacts RY ₂ -S, RY ₃ -S, RY ₄ -S
Since point 1 remains in its original state, cold dehumidification operation starts from point 1. Due to this dehumidification operation, the humidity decreases, while the temperature naturally increases due to the indoor characteristics and reaches the upper limit temperature T _s +α at point 2. By the way, when the detection signal v ₁ becomes H level and the output v ₂ of the comparator IC ₁ is inverted to L level, the feedback diode D ₁ of the comparator IC ₁ is positively biased and becomes conductive. Therefore, the reference value V _ref1 falls to the voltage value determined by the resistor R ₅ and is changed to V' _ref1 . This changed reference value V′ _ref1 is the upper limit temperature T _s
Corresponds to +α. Now, during cold dehumidification operation, when the room temperature T _R naturally increases due to indoor characteristics and reaches the upper limit value T _s +α, the temperature detection signal v ₁ decreases and the change reference value V' _ref1
Therefore, the output _v2 of the comparator _IC1 is inverted to the H level. This reversal causes transistor Q ₁ to become
It turns ON, relay contact RY ₁ -S switches to NO side, cooling valve SV ₁ turns on, and cooling operation starts. Also,
Due to the reversal of v ₂ , diode D ₁ is reverse biased and becomes non-conducting, so no current flows.
The reference value is increased from V' _ref1 to V _ref1 and reset. In this way, in control mode A, cooling and cool dehumidification are alternately operated as shown in the points 0→1→2→3→4 (FIG. 4) on the premise that t _b ≦ _TR . Eventually, point 5 where the humidity is equal to or less than the set value H _s
, the humidity detection signal _v5 becomes H level equal to or higher than the reference value _Vref3 , and the comparator
The output _v6 of IC ₃ is inverted to L level and the transistor
Q ₃ turns OFF. Therefore, relay contact RY ₃ −S
turns OFF and indoor fan motor FM ₁ stops. As the output v ₆ is inverted, AND ₁ turns OFF and transistor Q ₃ turns OFF, so RY ₂ −S turns OFF.
Compressor motor CM, outdoor fan motor
FM ₂ was stopped and the air conditioner ACM was completely stopped. Furthermore, since the feedback diode _D3 of the comparator _IC3 is positively biased by the inversion of the L level of the output _v6 , the reference value changes from _Vref3 to _V'ref3 in the same manner as the other comparators _IC1 and _IC2 . The voltage value is changed to the lower value. This V' _ref3 corresponds to the return humidity H _s '. Thereafter, when the indoor humidity naturally rises to H _s ', the humidity signal v ₅ becomes an L level equal to or lower than the reference value V' _ref1 , and the output v ₆ of the comparator IC ₃ is inverted to an H level again. Then, the above-described alternate operation of cooling and cold dehumidification is started. [Control mode A ₁ ] The control operation in this case is point 0.
The control mode is the same as control mode A from 1 to 2'' through point 1.In other words, cool dehumidification operation is performed from the point when the set temperature _Ts at point 1 is reached, but depending on the characteristics of the room. Room temperature T due to cold dehumidification operation
_R may decrease. Therefore, assuming that point 2'' has now been reached, the value of the temperature detection signal v ₁ becomes an H level equal to or greater than the reference value V _ref2 of the comparator IC ₂ , and the output v ₃ of the comparator IC ₂ is inverted to an L level. Then transistor Q ₂ turns OFF,
RY ₂ -S contact turns OFF and compressor motor
CM, outdoor fan motor FM ₂ stops. Also, at this time, since V _ref1 < V _ref2 , the output v ₂ of the comparator IC ₁ has already been inverted to the L level, so the transistor Q ₁ is OFF, and the contact
RY ₁ -S is on the NC side. Therefore, all transistors except Q ₃ and Q ₄ are OFF,
Only indoor fan motor FM ₁ rotates to perform ventilation operation. Further, as the output _v3 of the comparator IC3 becomes L level, _the diode _D2 is positively biased, and the reference value is changed from _Vref2 to a higher value _V'ref2 . This V' _ref2 corresponds to the set temperature T _s and is substantially equal to the value of V _ref1 . The room temperature rises naturally due to the air blowing operation from point 2'' and then reaches the set value T _s at point 3'. At this time, the detection signal v ₁ is equal to the reference value V' _ref2
Since the output v ₂ of the comparator IC ₂ is reversed to the L level again, the compressor motor CM and the outdoor fan motor FM ₂ start driving, and a cold dehumidifying operation is started. Thereafter, air blowing and cold dehumidification are alternately operated in the same manner until the humidity reaches the set humidity _Hs . When the set humidity H _s reaches point 5'', the output v ₆ of the comparator IC ₃ becomes L.
level, transistor _Q3 turns OFF and everything stops. Thereafter, when the humidity naturally rises and reaches the return humidity H _s ', the above-described alternating operation of air blowing and cool air dehumidification is resumed, as described in connection with control mode A. [Control mode B] In this case, the state is T _R <t _b at point 0', and the cooling operation from point 0' to point 1 is the same as in modes A and _A1 described above, but the dehumidification operation is It is different in that it is warmer. That is, at the start (when applying a voltage of +V ₁ ), the detected value v ₁ is at an H level equal to or higher than the reference value V _ref4 due to the condition of T _R <T _b , so the latch circuit LAT stores an L level. be done. On the other hand, the output v ₂ of the comparator IC ₁ is at the H level, and therefore the output of the OR circuit OR ₁ is at the H level, so the transistor Q ₄ is turned on and the outdoor fan motor FM ₂ rotates, causing the point 0' Cooling operation is performed from to point 1. Next, when the room temperature T _R reaches point 1, the output v ₂ of the comparator IC ₁ goes to L level, and since both inputs of OR circuit OR ₁ are at L level, the output also goes to L level and the transistor
_Q4 is OFF. Yotsute outdoor fan motor FM ₂
does not rotate and enters warm dehumidification operation. At this time,
Since transistors Q ₁ and Q ₄ are OFF and transistors Q ₂ and Q ₃ are ON, they are connected to the dehumidifying valve SV ₂ , the indoor fan motor FM ₁ rotates, and the compressor motor CM is driven. In this way, when the warm dehumidification operation is performed and the room temperature naturally rises to point 2' (T _s + α), the temperature signal v ₁
becomes less than the reference value _V'ref1 , the output _v2 of the comparator _IC1 is inverted to H level, and the transistor _{Q1 is} turned off again.
is ON, OR ₁ output is at H level, Q ₄ is ON, and cooling operation starts. Thereafter, in the same manner, cooling and warm dehumidification operations are alternately performed, and when the set humidity H _s reaches point 5', the mode A or
As with A ₁ , it will be completely stopped. If the humidity subsequently rises to H _s ', the alternating operation of cooling and warm dehumidification is restarted as described above. Note that this control mode B
In the operation of each comparator IC ₁ , IC ₂ , IC ₃
The comparison operation, reference value changing operation, etc. are the same as in the control modes A and _A1 , so the details are omitted. As described above, according to the present invention, it is possible to control not only the temperature but also both temperature and humidity as in the conventional case, so that air conditioning can be performed in accordance with human comfort conditions. In addition, when controlling temperature and humidity as described above, the indoor load characteristics are automatically determined based on the indoor temperature state before air conditioning operation, and the air conditioner is automatically controlled according to the indoor load characteristics. be able to.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a conventional temperature control method, Fig. 2 is an explanatory diagram showing a conventional temperature and humidity control method, and Fig. 3 is an explanatory diagram showing a conventional temperature control method.
The figure is a conceptual diagram of an air conditioning system used for temperature and humidity control according to the present invention, Figure 4 is an explanatory diagram of the control method of the present invention, and Figure 5 is an explanatory diagram of the method of setting the discrimination reference temperature.
FIG. 6 is a main control circuit diagram of the control device according to the present invention;
Figure 7 is the air conditioner control circuit diagram, Figures 8 and 9 are diagrams explaining the operation of the comparator, Figure 10 is the refrigeration cycle diagram of the air conditioner, and Figure 11 is the operation mode of the air conditioner and the operation of each device. This is a chart showing the relationship between ACM...Air conditioner body, TD...Temperature sensor,
HD...Humidity sensor, THC...Temperature and humidity control device,
T _s ... Set temperature, T _s + α ... Upper limit temperature, T _s −
α...Lower limit temperature, t _b ...Discrimination reference temperature, T _R ...
Room temperature, _Hs ...set humidity, _Hs '...reset humidity,
A, A ₁ , B...control mode, G...comfort condition area.

Claims (1)

[Scope of Claims] 1. Temperature control is performed so that the indoor temperature becomes a target temperature by selectively performing cooling, cold dehumidification, warm dehumidification, and ventilation operations, and the comfort conditions are satisfied with respect to the target temperature. In an air conditioner that controls indoor humidity to a humidity determined by the temperature-humidity relationship, the target is achieved by a cool dehumidifying operation determined by the load characteristics of the room to be air-conditioned and the cooling capacity of the air conditioner by the cool dehumidifying operation. The upper limit of the indoor temperature without air conditioning that can be reached is the reference temperature for discrimination, and by comparing the indoor temperature before the start of operation with the reference temperature for discrimination, if the former is higher than the latter, it will be colder after the target temperature is reached. The temperature of the air conditioner is characterized in that dehumidifying operation and cooling operation are alternately operated, and when the former is lower than the latter, after the target temperature is reached, the warm dehumidifying operation and cooling operation are alternately operated. Humidity control method.