JPH08285353A - Air conditioner - Google Patents

Abstract

PURPOSE: To improve the comfortability of indoor environment by a method wherein at least the outlet temperature and the quantity of outlet air of an indoor machine to attain a comfortable indoor environment, are operated from a difference between the detecting value of an indoor temperature and an objective indoor temperature while the operating frequency and the number of rotation of an indoor fan are controlled so as to obtain the operated values. CONSTITUTION: The outlet temperature and the quantity of outlet air of an indoor machine to attain a comfortable indoor environment at present time, are obtained from difference between the suction temperature (indoor temperature) of an indoor heat exchanger 3 and a set objective environment or an objective indoor temperature. Then, the operating frequency of a compressor 1 and the number of rotation of an indoor fan 4 are controlled so as to obtain the set condition. By the constitution the temperature of the indoor heat exchanger and the air volume of the indoor fan are set so as to be the temperature and the air volume which obtain comfortable indoor environment at the present time whereby the comfortability of the indoor environment can be improved for a time until the indoor temperature arrives at the objective indoor temperature and thereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner,
Particularly, the present invention relates to a control method capable of always ensuring the comfort of the indoor environment.

[0002]

2. Description of the Related Art In particular, a control method of a conventional air conditioner (hereinafter, also referred to as an air conditioner) will be described in order of items corresponding to respective embodiments of the present invention described later.

Prior Art Part 1 FIG. 5 shows an example of a conventional indoor temperature control method during cooling operation in an air conditioner. The difference between the indoor temperature Ta at the start of operation and the indoor target temperature Ta '(Δ
T = Ta-Ta ') determines the operating frequency of the compressor (hereinafter, also referred to as operating Hz) and the rotation speed of the indoor fan, and controls the compressor and the indoor fan (for example, Japanese Examined Patent Publication 6).
0-12532). This operating state is
(Steps 201 to 203). Therefore, the target set temperature is reached and maintained by executing the operating state set by each ΔT detected as the operation progresses. However, this operation control method has the following problems. Comfort is not maintained until the indoor target temperature is reached because the blowing temperature and indoor airflow (wind speed) required for comfort are not controlled. That is, even if ΔT is the same 20 degrees, in order to reach a certain indoor target temperature, there is a method in which the room temperature is 35 degrees and the room air is stirred at a high wind speed. There is also a method to stir slowly at the wind speed. Which one to select is determined by the driving situation up to that point, but for the human body in the room, the wind of 35 degrees was suddenly changed to 40 degrees or vice versa. It is quite possible that the wind may have suddenly become 35 degrees even though there was 40 degrees in the past. Therefore, comfort cannot be maintained until the indoor target temperature is reached. Even after reaching the indoor target temperature, it is impossible to know whether it is comfortable or uncomfortable because the blowing temperature and the indoor airflow (wind speed) required for comfort are not controlled. Since the operating Hz and the rotation speed of the indoor fan are determined by ΔT, the temperature control of each component is not performed. For this reason, the temperature of each component depends on the operating state, and the temperature control of the blowing temperature cannot be performed.

Prior Art No. 2 In the conventional cooling operation of an air conditioner, the indoor temperature (intake temperature of the indoor unit) and the indoor humidity (value by a humidity sensor mounted on the surface of the indoor unit) are measured, and the target values are set. The operation frequency of the compressor and the rotation speed of the indoor fan were controlled so as to satisfy the conditions. In this case, since the sensible heat load and the latent heat load are not separately controlled, it is difficult to control the operation that satisfies both the indoor dry-bulb temperature and the humidity, and it is difficult to more finely adjust the indoor environment.

Prior art No. 3 In the conventional cooling and dehumidifying operation of an air conditioner (normal dehumidifying), the operation Hz of the compressor is set to a certain constant Hz and the rotation speed of the indoor fan is kept low and constant. Since the operating Hz of the compressor is generally set to Hz corresponding to a medium load, the indoor temperature may gradually rise if a load higher than that is required in the room. Moreover, since the indoor fan is fixed at a low rotation speed, it cannot follow the fluctuation of the indoor load. Further, since the temperature and heat quantity of each component are not controlled, the temperature of the indoor heat exchanger may be increased depending on the conditions, dehumidification cannot be performed, and there is a possibility that the operation will be the same as the normal cooling operation.

Prior art No. 4 The isothermal dehumidifying operation of a conventional air conditioner is as shown in FIG.
The heat exchanger 8 having an auxiliary heating function is attached near the indoor heat exchanger 3, and the air cooled by the indoor heat exchanger 3 is reheated. In this case, not only the indoor unit becomes large because of the auxiliary heat exchanger 8, but also
The refrigeration cycle also becomes complicated. In the refrigeration cycle of FIG. 6, 1 is a compressor, 2 is a 4-way valve, 4 is an indoor fan, 5 is an electronic expansion valve (pressure control valve), 6 is an indoor heat exchanger, and 7 is an outdoor fan.

Prior Art No. 5 If the indoor heat exchanger is operated below a certain temperature, there is a possibility that the indoor unit may have a problem of dew or water drop. Therefore, in the conventional cooling operation and dehumidifying operation, the operation Hz of the compressor and the rotation speed of the indoor fan are adjusted so that the temperature of the indoor heat exchanger does not drop below a certain temperature (about 2 ° C.). However, depending on the conditions (such as continuous operation under fairly severe conditions such as an indoor heat exchanger temperature of 3 ° C.), the casing temperature of the indoor unit (particularly the outlet) may drop, and the above problems may occur. It was

Prior Art No. 6 Some air conditioners include an indoor unit provided with a convection type indoor heat exchanger, an indoor fan and a radiant radiant panel. In such a conventional radiant air conditioning system,
The indoor temperature (suction port temperature of the convection indoor heat exchanger), the panel temperature of the radiant panel, and the indoor humidity were sensed and controlled. For example, in the combined cooling operation in which the radiant panel is used for cooling and radiant air conditioning and the convection type indoor heat exchanger is used for indoor convective cooling and air conditioning, the temperature of the radiant panel is controlled so that the panel temperature does not fall below the minimum temperature to prevent dew condensation. In addition, the convection type indoor heat exchanger was controlled so that the indoor thermal environment becomes a target, as in a normal air conditioner. For this reason, how the indoor comfort is changing because the comfort control that affects the indoor environment such as the amount of cold radiation heat from the radiant panel and the temperature and amount of air blown from the convection indoor heat exchanger is not controlled. However, because the temperature of each component was not controlled, the indoor environment fluctuated.

Prior art No. 7 In the conventional radiant air conditioning system, when the cooling and dehumidifying operation is performed during the combined cooling operation in which the radiant panel is used for cooling radiant air conditioning and the convection type indoor heat exchanger is used for indoor convective cooling and air conditioning The operating frequency of the compressor was made equal to the current Hz, and the rotation speed of only the indoor fan was reduced. When such an operation is performed, the panel temperature does not change as compared with the combined cooling operation, but the convection indoor heat exchanger temperature decreases and the indoor fan air volume decreases. Therefore, the amount of heat supplied from the radiant panel (the amount of cold radiant heat) does not change, but the cooling capacity (both sensible heat capacity and latent heat capacity) from the convection indoor heat exchanger decreases. For this reason, the amount of cold heat supplied to the room decreases, the indoor environment temperature rises, and the room becomes cold and the dehumidifying operation cannot be performed. In addition, because dehumidification cannot be performed, indoor humidity rises and comfort is impaired.

Prior Art No. 8 In the conventional radiant air conditioning system, when the radiant panel is used for cooling radiant air conditioning and the convection type indoor heat exchanger is used for indoor convective cooling and air conditioning, the above-mentioned isothermal dehumidifying operation is performed. A heat exchanger having an auxiliary heating function similar to that shown in FIG. 6 is attached near the convection indoor heat exchanger, and the air cooled by the convection indoor heat exchanger is reheated. In this case, the auxiliary heat exchanger not only increases the size of the indoor unit but also complicates the refrigeration cycle.

[0011]

In the conventional air conditioner, the operation Hz of the compressor and the rotation speed of the indoor fan are controlled by the difference between the indoor temperature at the start of operation and the indoor target temperature. The comfort of the indoor environment may be impaired until the temperature is reached, and even after the indoor target temperature is reached, the indoor temperature fluctuates due to opening and closing of windows and changes in the indoor temperature, etc. There was a problem that the sex might be impaired. In the cold dehumidification operation, dehumidification is not performed, and there is a risk that the operation will be the same as the normal cooling operation, and it is difficult to maintain comfort. In the isothermal dehumidifying operation, since the auxiliary heat exchanger is provided in the refrigeration cycle, there is a problem that not only the indoor unit becomes large but also the refrigeration cycle becomes complicated. Further, the radiant air-conditioning system including the radiant panel in the indoor unit also has the same problem as above.

The present invention has been made in view of the above,
An object of the present invention is to provide an air conditioner capable of improving the comfort of the indoor environment and performing an appropriate isothermal dehumidifying operation without complicating the refrigeration cycle.

[0013]

In order to solve the above-mentioned problems, the invention according to claim 1 provides an outdoor unit equipped with a compressor, an outdoor heat exchanger and an outdoor fan, an indoor heat exchanger and an indoor fan. In an air conditioner having an indoor unit provided with,
From the difference between the detected value of the indoor temperature and the indoor target temperature, the blowing temperature and blowing air volume of the indoor unit that makes the indoor environment comfortable are calculated, and the indoor heat exchanger temperature and the indoor fan air volume are set to these calculated values. The gist is that it is configured so that at least the operating frequency of the compressor and the rotation speed of the indoor fan are controlled so as to attain this set state.

According to a second aspect of the present invention, in an air conditioner having an outdoor unit equipped with a compressor, an outdoor heat exchanger and an outdoor fan, and an indoor unit equipped with an indoor heat exchanger and an indoor fan, Calculate the sensible heat load and latent heat load from the required environmental conditions, calculate the blowout temperature and blown air volume of the indoor unit so as to satisfy each of the obtained load amounts, and set the indoor heat to the calculated values. The gist is that the temperature of the exchanger and the air volume of the indoor fan are set, and at least the operating frequency of the compressor and the rotation speed of the indoor fan are controlled so as to be in this set state.

According to a third aspect of the present invention, in the air conditioner according to the second aspect, when the cooling and dehumidifying operation is performed,
The operating frequency of the compressor is higher than the operating frequency so that an air conditioning load can be output, and the indoor fan is configured to maintain the rotational speed.

According to a fourth aspect of the present invention, in the air conditioner according to the second aspect, when an isothermal dehumidifying operation is performed, an operation in which the operating frequency of the compressor is equal to or lower than the operating frequency can be output. The gist is that it is configured to operate at a frequency and control the rotation speed of the indoor fan to a rotation speed lower than the rotation speed.

The invention according to claim 5 is the above-mentioned claim 1,
In the air conditioner according to 2, 3, or 4, when the operation in which the indoor heat exchanger temperature is equal to or lower than a certain specified value is performed for a certain time, an operation for increasing the indoor heat exchanger temperature to a predetermined temperature is performed for a predetermined time. The point is that it is configured to do.

According to a sixth aspect of the invention, an outdoor unit equipped with a compressor, an outdoor heat exchanger and an outdoor fan, and an indoor unit equipped with a convection type indoor heat exchanger, an indoor fan and a radiant radiant panel. In the air conditioner having, calculate the blowout temperature of the indoor heat exchanger, the blowout amount of the indoor fan and the panel temperature of the radiant panel, which makes the indoor environment comfortable from the difference between the detected value of the indoor temperature and the indoor target temperature. ,
The indoor heat exchanger temperature, the indoor fan air flow rate, and the panel temperature are set so as to be the calculated values, and at least the operating frequency of the compressor and the rotation speed of the indoor fan are controlled so as to attain these set states. The gist is that it is configured in this way.

According to a seventh aspect of the invention, in the air conditioner according to the sixth aspect, when the cooling and dehumidifying operation is performed,
The operating frequency of the compressor is higher than the operating frequency, and the indoor fan is configured to maintain the rotational speed.

According to an eighth aspect of the present invention, in the air conditioner according to the sixth aspect, when the isothermal dehumidifying operation is performed, the operating frequency of the compressor is maintained at the operating frequency, and the rotation speed of the indoor fan is the rotational speed. The gist is that the number of revolutions is controlled to be lower than the number of revolutions.

[0021]

In the invention of claim 1, the blowout temperature and the blown air volume of the indoor unit in which the indoor environment is comfortable at the present time are obtained from the difference between the detected value of the indoor temperature and the indoor target temperature. The indoor heat exchanger temperature and the indoor fan air flow rate are set so as to satisfy the above condition, and the operating frequency of the compressor and the indoor fan rotation speed are controlled so as to attain this set state. Therefore, the comfort of the indoor environment is improved as compared with the prior art until the indoor target temperature is reached and thereafter.

According to the second aspect of the invention, the sensible heat load and the latent heat load required to realize a comfortable space are obtained, and the indoor heat exchanger temperature and the indoor fan air volume are determined so as to satisfy the respective load amounts. Thus, the operating frequency of the compressor and the rotation speed of the indoor fan are controlled. As a result, both temperature and humidity are controlled, and the indoor environment becomes more comfortable.

In the invention according to claim 3, when the cooling and dehumidifying operation is requested, the operating frequency of the compressor exhibits a slightly higher capacity than the operating frequency of the compressor and the rotation speed of the indoor fan during the normal cooling operation. Thus, the indoor fan speed is set to maintain the current state. Due to this operation, the indoor heat exchanger temperature becomes lower than that during normal cooling operation, and the indoor fan air volume does not change, so the output load ratio (= latent heat load / sensible heat load) is higher than during normal cooling. The dehumidifying effect is high. Also, since the amount of heat supplied is increased, the required sensible heat load can be maintained. Therefore, the dehumidifying operation is performed while maintaining the comfort.

In the invention according to claim 4, when the isothermal dehumidifying operation is required, the operating frequency of the compressor is maintained at the current state or is lower than the operating frequency of the compressor and the rotation speed of the indoor fan during the normal cooling operation. It is set to output a slightly lower capacity, and the indoor fan rotation speed is set low. Due to this operation, the indoor heat exchanger temperature can be operated lower than in normal cooling operation, and the indoor fan air volume is decreased, so the output load ratio (= latent heat load / sensible heat load) is normal. The dehumidifying effect is higher because the size is larger than that during cooling. Moreover, since the output is narrowed down, the sensible heat load is further reduced. Therefore, it is possible to perform the isothermal dehumidifying operation without increasing the size of the indoor unit and complicating the refrigeration cycle.

In the invention according to claim 5, it is prevented that the temperature of the indoor heat exchanger rises before the casing temperature of the indoor unit falls and the casing temperature falls to the dew condensation temperature.

According to the sixth aspect of the invention, in the air conditioner in which the indoor unit is a convection type indoor heat exchanger, and the indoor fan and the radiation panel are used together, the indoor environment is comfortable at the present time. The blowout temperature of the indoor fan, the blown air volume of the indoor fan, and the panel temperature of the radiant panel are obtained, and the indoor heat exchanger temperature, the indoor fan air volume, and the panel temperature are set so as to be the blown air temperature, the blown air volume and the panel temperature. The operating frequency of the compressor and the rotation speed of the indoor fan are controlled so that the state is achieved. Therefore, the comfort of the indoor environment is improved as compared with the prior art until the indoor target temperature is reached and thereafter.

In a seventh aspect of the invention, when a cooling and dehumidifying operation is required in an air conditioner in which a radiation panel is used in combination with the indoor unit, the operating frequency of the compressor during normal cooling operation and the indoor fan The operating frequency of the compressor is set to an operating frequency that outputs a slightly higher capacity with respect to the rotational speed, and the indoor fan rotational speed is set to maintain the current state. By this operation, the temperature of the indoor heat exchanger is lower than that in the normal cooling operation, and it becomes possible to operate so that the panel temperature and the indoor fan air volume do not change. As a result, the ratio of the output load (= latent heat load / sensible heat load) is larger than that during normal cooling, and the dehumidifying effect is enhanced. Since the amount of cold heat is increased, the required sensible heat load can be maintained. Therefore, the dehumidifying operation is performed in a state where the comfort of the indoor environment is maintained.

According to the present invention, when an isothermal dehumidifying operation is required in an air conditioner in which a radiation panel is used in combination with an indoor unit, the operating frequency of the compressor and the indoor fan rotation speed during normal operation are compared. The operating frequency of the compressor is set to maintain the current status, and the indoor fan rotation speed is set to a low value. By this operation, the temperature of the indoor heat exchanger is lower than that in the normal cooling operation, the panel temperature does not change, and the operation of reducing the indoor fan air volume becomes possible. As a result, the ratio of the output load (= latent heat load / sensible heat load) is larger than that during normal cooling, and the dehumidifying effect is enhanced. Further, since the room temperature is controlled by the amount of heat supplied by the radiant cooling, the room temperature does not change. Therefore, the isothermal dehumidifying operation is performed in a state where the indoor unit is not enlarged, the refrigeration cycle is not complicated, and the comfort of the indoor environment is maintained.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The present embodiment is made to the first prior art. In the refrigerating cycle of FIG. 1, the same or equivalent devices as those in FIG. 6 are designated by the same reference numerals, and duplicate explanations are omitted. FIG.
In, Td is a discharge temperature sensor of the compressor, Tsu is a suction temperature sensor of the compressor, TE is an outdoor heat exchanger liquid side temperature sensor, and Tc is an indoor heat exchanger temperature sensor. In addition, the suction temperature (indoor temperature) of the indoor heat exchanger 3 is Ta as the indoor environment, and the indoor target temperature is T as the set target environment.
a '. In the present embodiment, the indoor heat exchanger temperature and the indoor fan are obtained from the difference (ΔT = Ta−Ta ′) between the indoor temperature and the indoor target temperature to obtain the blowout temperature and the blown air volume of the indoor unit in which the indoor environment is comfortable at the present time. The air volume is set, and the operation Hz of the compressor 1 and the rotation speed of the indoor fan 4 are controlled so as to attain this set state. This control method will be further described with reference to the control flowchart of FIG.

When a driving command is received, check the date, time, etc.,
After measuring the outdoor temperature (step 101), the indoor temperature is measured to confirm the indoor target temperature. The indoor target temperature corresponds to, for example, an input value from the user's remote controller (step 102). After confirming these, comfort evaluation (PMV) is performed from the indoor temperature and the indoor target temperature. That is, the blowing temperature and the blowing flow rate from the indoor unit at which the indoor environment feels comfortable at the present time are calculated from the difference between the indoor temperature and the indoor target temperature (step 103). Then, the indoor heat exchanger temperature, the indoor fan air volume, and the louver angle are set so as to obtain the blowout temperature and the blown air volume (step 104). The number is controlled (step 105). At this time, as shown in the table of step 105, the indoor fan rotation speed F is fixedly determined by the content of the operation command. On the other hand, the indoor heat exchanger temperature has a certain frame in the operating Hz of the compressor 1 for achieving the set indoor heat exchanger temperature x degrees, but in addition to the operating Hz of the compressor 1, It also changes depending on the rotation speed of the indoor fan 4, the rotation speed of the outdoor fan 7, the indoor temperature, and the outdoor temperature. Therefore, with respect to the set indoor heat exchanger temperature x degrees, first, the compressor 1 is operated at the operating Hz within the above-mentioned frame, and the current indoor heat exchanger temperature is lower or higher than the set indoor heat exchanger temperature. Therefore, the operation Hz of the compressor 1 and the rotation speed of the outdoor fan 7 are adjusted again, and the current indoor heat exchanger temperature is controlled to reach the set indoor heat exchanger temperature. Step 10
In the table of No. 5, the operating Hz of the compressor 1 is 0 <H ₁ <H ₂
<... <H _n , the rotation speed of the outdoor fan 7 is 0 <0 ₁ <0 ₂ <
When 0 ₃ <0 ₄ and during heating operation, the difference Δx (= α) between the set indoor heat exchanger temperature and the current indoor heat exchanger temperature
Is −2 <Δx ₁ <... <Δx _n , and the rotation speed of the indoor fan 4 is 0 <F ₁ <... <F _n . As described above, the operation Hz of the compressor 1 and the outdoor fan rotation speed are determined (step 1
06) After setting the valve opening degree of the electronic expansion valve 5 corresponding to this operation Hz (step 107), the indoor heat exchanger temperature is constantly fed back and monitored so as to be within a predetermined temperature range. That is, after operating for a certain period of time, the current indoor heat exchanger temperature and the amount of change β are measured (step 108,
109), if the current indoor heat exchanger temperature is within a predetermined temperature range with respect to the set indoor heat exchanger temperature, the operation Hz of the compressor 1 and the rotation speed of the outdoor fan 7 are maintained as they are, and the current indoor heat exchanger temperature is maintained. Is outside the predetermined temperature range for the set indoor heat exchanger, the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 7 are adjusted accordingly to bring the current indoor heat exchanger temperature to the set value ( Step 110). After that, step 1
02 to 110 are repeatedly controlled to maintain the comfort of the indoor environment. By the above-mentioned operation, it becomes possible to control the blowing temperature and the blowing wind speed of the indoor unit, and the indoor environment is always comfortable. In addition, even if the indoor temperature fluctuates due to opening and closing of windows and changes in the outdoor temperature, the indoor environment is always calculated and controlled so that it is more comfortable than the conventional example. Becomes

Second Embodiment This embodiment is made to the prior art No. 2 described above, and step 1 in the control flowchart of FIG.
In 02, measurement of indoor humidity was added, and steps 102 and 1
Calculation of the sensible heat load and the latent heat load is performed between 03. Then, the settings of the indoor heat exchanger temperature, the indoor fan air volume, etc. in step 104 are changed depending on the ratio of the output load (R = latent heat load / sensible heat load). The value of R is R ≦
If 0.1, the steps 105 and thereafter are executed in the same manner as in the case of the first embodiment. That is, the dry-bulb temperature and humidity necessary to realize a comfortable space are calculated, the sensible heat load and latent heat load are calculated, and the indoor heat exchanger temperature and the indoor fan air volume are determined to satisfy these load amounts, and the compression is performed. The operation Hz of the machine 1 and the rotation speed of the indoor fan 4 are controlled. By performing this operation, both the dry-bulb temperature and the humidity can be controlled, and the indoor environment can be controlled more finely.

Third Embodiment This embodiment is made in contrast to the prior art No. 3 described above. In this embodiment, the following contents are added to the control of the above-mentioned second embodiment. When the cold dehumidification operation is requested, the latent heat load and the sensible heat load are calculated, and the indoor heat exchanger temperature and the indoor fan rotation speed are set for the cold dehumidification operation. That is, step 1 in the control flowchart of FIG.
The value of the set indoor heat exchanger temperature of 04 is x ′ (target) = (x in this embodiment, in contrast to x (target) in the first embodiment.
(Target) −4 degrees) (however, x ′ (target) ≧ 2 degrees). The value of R (= latent heat load / sensible heat load) is 0.1 <R ≦ 0.5, and the latent heat load becomes larger than the ratio of the sensible heat load during normal cooling (the ratio is a constant value. Not, it depends on the operating environment). Therefore, with respect to the operation Hz and the indoor fan rotation speed of the compressor 1 when the normal cooling operation is performed, the operation Hz is set to be increased to output a slightly higher capacity, and the indoor fan rotation speed is maintained as it is. Set as. That is, the operating Hz for Δx, F in the table of step 105 in the control flowchart of FIG. 2 is a value that is one rank higher than that in the case of the first embodiment. For example, operating Hz = H ₁ → operating Hz
= H ₂ , and operation Hz = H _n → operation Hz = H _{n + 1} (max
Hz remains unchanged). When this operation is performed, the indoor heat exchanger temperature can be operated lower than the normal cooling operation, and since the indoor fan air volume does not change,
The output load ratio R is larger than that during normal cooling, and the dehumidifying effect is enhanced. Moreover, since the supplied heat amount is increased, the required sensible heat load can be maintained. In this case, since the indoor unit emits a low temperature, the louver is swung vertically and horizontally. As a result, since the human being in the living space is not directly exposed to the wind for a long time, the body surface temperature does not change, the humidity decreases, and the comfort is maintained.

Fourth Embodiment This embodiment is made to the prior art No. 4 described above. In this embodiment, the following contents are added to the control of the second embodiment. When the isothermal dehumidifying operation is requested, the latent heat load and the sensible heat load are calculated, and the indoor heat exchanger temperature and the indoor fan rotation speed are set for the isothermal dehumidifying operation. R
The value of (= latent heat load / sensible heat load) is 0.5 <R, there is almost no sensible heat load, and the latent heat load occupies most of the ratio (the ratio is not a constant value, depending on the operating environment. different).
Therefore, the operation H of the compressor 1 in the normal cooling operation is performed.
With respect to z and the indoor fan rotation speed, the operating Hz is maintained as it is or set to be low to output a slightly lower capacity,
Moreover, the rotation speed of the indoor fan is lower than that during normal cooling.
That is, in step 104 in the control flowchart of FIG. 2, the indoor fan rotation speed F is set to be one rank lower than that in the first embodiment. For example, the indoor fan rotation speed F ₃ → the indoor fan rotation speed = F ₂ , and the indoor fan rotation speed F ₁ → the indoor fan rotation speed F ₁ ′ (F ₁ ′ is the air volume at which the wind does not reach the living space). Further, the value of α in the table in step 105 is changed to α = 0.75. By performing this operation, the indoor heat exchanger temperature can be operated lower than in the normal cooling operation, and since the indoor fan air volume is reduced, the output load ratio R is larger than in the normal cooling operation. And the dehumidifying effect is enhanced. In addition, the sensible heat load is further reduced because the air conditioner output is reduced. Therefore, the indoor unit is not enlarged and the refrigeration cycle is not complicated,
Can perform isothermal dehumidification operation. When this operation is performed, there is an operation in which the indoor fan rotation speed = F ₁ 'as described above.
The wind does not reach the human in the living space, but the indoor humidity during operation when F ₁ 'is a comfortable value, so the amount of heat released from the human body does not change much. Further, the air around the indoor unit is dehumidified, and the humidity diffusion speed is high, so that the indoor humidity is lowered as a whole. Therefore, the comfort value can be maintained.

Fifth Embodiment This embodiment is made to the fifth prior art. The indoor heat exchanger temperature is below a certain specified value (for example, 5
When the operation of (° C.) is performed for a certain time (for example, 1 hour), the operation of increasing the temperature of the indoor heat exchanger to a certain temperature (for example, 10 ° C.) is performed for a certain time (for example, 10 minutes). By using this control, the indoor heat exchanger temperature is raised before the casing temperature of the indoor unit is lowered, so that it is possible to prevent the casing temperature from dropping to the temperature at which dew condensation occurs.

Sixth Embodiment This embodiment is made to the sixth prior art. As shown in FIG. 3 and FIG. 4, the air conditioner of the present embodiment includes a compressor 1, an outdoor heat exchanger 6 and an outdoor fan 7 for an outdoor unit 12 and a convection type indoor heat exchanger for an indoor unit. 3. The indoor fan 4 and the radiation panel 11 are used together. In the refrigeration cycle of FIG. 4, 13, 14, 15, 1
6 is a pressure control valve. In this embodiment, the indoor temperature (suction port temperature of the indoor heat exchanger 3), the panel temperature of the radiant panel 11, the indoor humidity, and the indoor heat exchanger temperature are measured.
The control method is to obtain the radiant heat quantity, the sensible heat load, and the latent heat load required from the indoor environment from the indoor thermal environment and the target environmental state, and the radiant panel temperature and the indoor heat exchanger 3 that make the indoor environment comfortable. The temperature and the amount of air blown from the indoor fan 4 are calculated. The radiation panel temperature, the indoor heat exchanger temperature, and the indoor fan air volume are set so as to attain this temperature and the air volume, and the operation Hz of the compressor 1, the pressure control valve, and the rotation speed of the indoor fan 4 are set so as to achieve these set states. To control. That is, in this embodiment, the panel temperature is added to each of step 103 and step 104 in the control flowchart of FIG. In step 105, each panel temperature (for example, panel temperature Tp = 16, 18, 2
A table is prepared every 2 ° C. such as 0, 22, 24. By this operation, it becomes possible to control the radiant temperature from the indoor unit, the blowing temperature, and the blowing air volume,
The indoor environment is always comfortable. In addition, even if the indoor temperature fluctuates due to opening and closing of windows and changes in the outdoor temperature, the indoor environment is always calculated and controlled so that it is more comfortable than the conventional example. Becomes

Seventh Embodiment This embodiment is made to the prior art No. 7 described above. In this embodiment, when the cooling and dehumidifying operation is requested, the panel temperature of the radiant panel 11 is the same, the temperature of the indoor heat exchanger 3 is low, and the amount of air blown from the indoor fan 4 is increased. In the control shown in the example, the operation Hz of the compressor 1 and the indoor fan rotation speed when performing the combined cooling operation are set to the operation Hz that outputs a slightly higher capacity,
In addition, the indoor fan rotation speed is controlled to maintain the current state, and the temperature of each component is controlled. By performing this operation, the indoor heat exchanger temperature can be operated lower than in the normal cooling operation. In addition, the panel temperature and the indoor fan air volume did not change. As described above, the output load ratio R (= latent heat load / sensible heat load) is larger than that during normal cooling, and the dehumidifying effect is high. Also, since the amount of cold heat from the indoor unit is increased, the required sensible heat load can be maintained. Therefore, the cool and dehumidifying operation can be performed while the indoor environment remains comfortable.

Eighth Embodiment This embodiment is made in contrast to the prior art No. 8 described above. In this embodiment, in the control shown in the sixth embodiment, when the isothermal dehumidifying operation is requested, the panel temperature of the radiant panel 11 is the same, the temperature of the indoor heat exchanger 3 is low, and the blowing of the indoor fan 4 is performed. In order to reduce the air volume, the operation Hz of the compressor 1 and the indoor fan rotation speed when performing the combined cooling operation are set so that the operation Hz maintains the current state,
In addition, control is performed so that the indoor fan rotation speed is lower than the current one, and the temperature of each component is controlled. By performing this operation, the indoor heat exchanger temperature can be operated lower than in the combined cooling operation. Moreover, the indoor fan air flow rate is decreasing without changing the radiant panel temperature. From the above, the output load ratio R (= latent heat load / sensible heat load) becomes larger than that during combined cooling, and the dehumidifying effect becomes higher. Further, since the room temperature is controlled by the amount of heat supplied by the radiant cooling, the room temperature does not change. Therefore, the indoor unit is not enlarged, the refrigeration cycle is not complicated, and the isothermal dehumidification operation can be performed while the indoor environment is comfortable.

In the air conditioner combined with the radiation panel described in the above sixth to eighth embodiments, the indoor space is overcooled due to the amount of heat output from the convection indoor heat exchanger 3,
Excessive warming can be corrected by the radiant heat from the radiant panel 11 by controlling the diversion by the pressure control valves 13 to 16.

[0040]

As described above, according to the first aspect of the invention, the blowing temperature and the blowing air volume of the indoor unit that makes the indoor environment comfortable are calculated from the difference between the detected value of the indoor temperature and the indoor target temperature. , The indoor heat exchanger temperature and the indoor fan air volume are set so as to obtain the calculated values, and at least the operating frequency of the compressor and the rotation speed of the indoor fan are controlled so that the set state is achieved. Since the exchanger temperature and the indoor fan air volume are set to the temperature and air volume at which the indoor environment is comfortable at the present time, the comfort of the indoor environment can be improved until the indoor target temperature is reached and thereafter.

According to the second aspect of the invention, the sensible heat load and the latent heat load are obtained from the environmental conditions required in the room,
The blowout temperature and blowout air volume of the indoor unit are calculated so as to satisfy each of the obtained load amounts, and the indoor heat exchanger temperature and the indoor fan airflow rate are set so as to be the calculated values, and the set state is set. Since at least the operating frequency of the compressor and the rotational speed of the indoor fan are controlled, the operating frequency and the indoor fan rotational speed of the compressor are set so as to satisfy the sensible heat load and latent heat load necessary to realize a comfortable space. Since it is controlled, the indoor environment can be made more comfortable.

According to the third aspect of the present invention, when the cooling and dehumidifying operation is performed, the operating frequency of the compressor is operated at an operating frequency higher than the operating frequency so that the air conditioning load can be output, and the rotation speed of the indoor fan is increased. Since the above-mentioned rotation speed is maintained, the indoor heat exchanger temperature becomes lower than that during normal cooling operation, and the indoor fan air volume does not change, so the output load ratio (= latent heat load / sensible heat load) The dehumidifying effect is increased as it becomes large. Also, since the amount of heat supplied is increased, it is possible to maintain the required sensible heat load. Therefore, it is possible to appropriately perform the cooling and dehumidifying operation while maintaining the comfort.

According to the fourth aspect of the present invention, when the isothermal dehumidifying operation is performed, the operation frequency of the compressor is equal to or lower than the operation frequency, and the operation is performed at an operation frequency capable of outputting an air conditioning load, and the rotation of the indoor fan Since the number of revolutions is controlled to be lower than the above-mentioned number of revolutions, the indoor heat exchanger temperature can be operated lower than the normal cooling operation, and the indoor fan air volume is reduced. (=
The latent heat load / sensible heat load is large and the dehumidifying effect is enhanced. Moreover, since the output is narrowed down, the sensible heat load is further reduced. Therefore, it is possible to properly perform the isothermal dehumidifying operation without increasing the size of the indoor unit and complicating the refrigeration cycle.

According to the fifth aspect of the present invention, when the operation of keeping the indoor heat exchanger temperature at a predetermined value or less is performed for a certain period of time, the operation of raising the indoor heat exchanger temperature to a predetermined temperature is predetermined. Since the operation is performed for a long time, the temperature of the indoor heat exchanger can be raised before the temperature of the casing of the indoor unit decreases to the dew condensation temperature, and the casing temperature is prevented from decreasing to the dew condensation temperature.

According to the sixth aspect of the invention, in the air conditioner using the convection type indoor heat exchanger, the indoor fan and the radiant panel together in the indoor unit, the difference between the detected value of the indoor temperature and the indoor target temperature is determined. The indoor temperature of the indoor heat exchanger that makes the indoor environment comfortable, the air volume of the indoor fan and the panel temperature of the radiant panel are calculated, and the indoor heat exchanger temperature and the indoor fan air volume are set to these calculated values. And, since the panel temperature is set, and at least the operating frequency of the compressor and the rotation speed of the indoor fan are controlled so as to be in this set state, the indoor heat exchanger temperature,
Since the indoor fan air flow rate and the panel temperature are set to the temperature and air flow rate at which the indoor environment is comfortable at the present time, the comfort of the indoor environment is improved as compared with the prior art until the indoor target temperature is reached and thereafter.

According to the seventh aspect of the invention, in the air conditioner in which the radiant panel is also used in the indoor unit, when the cooling and dehumidifying operation is performed, the operating frequency of the compressor is higher than the operating frequency. Since it is operated and the rotation speed of the indoor fan is maintained at the rotation speed, the temperature of the indoor heat exchanger is lower than that during normal cooling operation, and it is possible to operate so that the panel temperature and the indoor fan air volume do not change. The dehumidifying effect can be enhanced by increasing the output load ratio (= latent heat load / sensible heat load). Moreover, since the amount of cold heat is increased, it is possible to maintain the required sensible heat load.
Therefore, it is possible to appropriately perform the cooling and dehumidifying operation while maintaining the comfort.

According to the eighth aspect of the present invention, in the air conditioner in which the radiation panel is used together with the indoor unit, when the isothermal dehumidifying operation is performed, the operating frequency of the compressor is maintained at the operating frequency, and the indoor fan Since the rotation speed is controlled to be lower than the rotation speed, the indoor heat exchanger temperature is lower than in normal cooling operation, and the panel temperature does not change,
The indoor fan air volume can be reduced, and the dehumidification effect can be enhanced by increasing the output load ratio (= latent heat load / sensible heat load). Further, since the room temperature is controlled by the amount of heat supplied by the radiant cooling, the room temperature can be kept unchanged. Therefore, it is possible to appropriately perform the isothermal dehumidifying operation in a state where the comfort of the indoor environment is maintained without increasing the size of the indoor unit and complicating the refrigeration cycle.

[Brief description of drawings]

FIG. 1 is a diagram showing a refrigeration cycle in a first embodiment of an air conditioner according to the present invention.

FIG. 2 is a control flowchart for explaining the control method of the first embodiment.

FIG. 3 is a configuration diagram of an air conditioner of a sixth embodiment of the present invention.

FIG. 4 is a diagram showing a refrigeration cycle of the sixth embodiment.

FIG. 5 is a control flowchart for explaining a conventional method for controlling an air conditioner.

FIG. 6 is a diagram showing a refrigeration cycle of a conventional air conditioner.

[Explanation of symbols]

 1 Compressor 3 Indoor heat exchanger 4 Indoor fan 6 Outdoor heat exchanger 7 Outdoor fan 11 Radiant panel

Claims (8)

[Claims] 1. An air conditioner having an outdoor unit equipped with a compressor, an outdoor heat exchanger and an outdoor fan, and an indoor unit equipped with an indoor heat exchanger and an indoor fan. From the temperature difference, calculate the blowing temperature and blowing air volume of the indoor unit that makes the indoor environment comfortable, and set the indoor heat exchanger temperature and the indoor fan air volume to the calculated values, and enter this setting state. Thus, the air conditioning apparatus is configured to control at least the operating frequency of the compressor and the rotation speed of the indoor fan. 2. In an air conditioner having an outdoor unit equipped with a compressor, an outdoor heat exchanger and an outdoor fan, and an indoor unit equipped with an indoor heat exchanger and an indoor fan, an environmental condition required indoors. Calculate the sensible heat load and latent heat load from the indoor heat exchanger temperature and the indoor temperature to obtain the calculated blown air temperature and blown air volume of the indoor unit so as to satisfy each of the obtained load amounts. An air conditioner configured to set a fan air volume and to control at least an operating frequency of the compressor and a rotation speed of the indoor fan so as to be in this set state. 3. When performing the cooling / dehumidifying operation, the operating frequency of the compressor is set to an operating frequency at which an air conditioning load higher than the operating frequency can be output, and the rotational speed of the indoor fan is maintained at the rotational speed. The air conditioner according to claim 2, wherein 4. When performing the isothermal dehumidifying operation, the compressor is operated at an operating frequency equal to or lower than the operating frequency so that an air conditioning load can be output, and the rotation speed of the indoor fan is lower than the rotation speed. The air conditioner according to claim 2, wherein the air conditioner is configured to be controlled to a rotation speed. 5. When the operation of keeping the indoor heat exchanger temperature below a certain specified value is performed for a certain period of time, the operation of raising the indoor heat exchanger temperature to a predetermined temperature is performed for a certain period of time. The air conditioner according to claim 1, 2, 3, or 4. 6. An air conditioner having an outdoor unit equipped with a compressor, an outdoor heat exchanger and an outdoor fan, and an indoor unit equipped with a convection type indoor heat exchanger, an indoor fan and a radiation type radiation panel. From the difference between the detected value of the indoor temperature and the indoor target temperature, the blowing temperature of the indoor heat exchanger, the blowing air volume of the indoor fan, and the panel temperature of the radiant panel, which make the indoor environment comfortable, are calculated. As described above, the indoor heat exchanger temperature, the indoor fan air volume, and the panel temperature are set, and at least the operating frequency of the compressor and the rotation speed of the indoor fan are controlled so as to be in this set state. An air conditioner characterized by: 7. When performing the cooling and dehumidifying operation, the compressor is configured to operate at an operating frequency higher than the operating frequency, and the indoor fan rotational speed is maintained at the rotational speed. The air conditioner according to claim 6, wherein: 8. When performing the isothermal dehumidifying operation, the operation frequency of the compressor is maintained at the operation frequency, and the rotation speed of the indoor fan is controlled to be lower than the rotation speed. The air conditioner according to claim 6, which is characterized in that.