JP2017003205A - Energy-saving cooling method for air-conditioner and cooling control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system which controls a dehumidification amount without causing decline in cooling performance and thereby saving energy to be used for dehumidification while keeping a sensory temperature constant.SOLUTION: An energy-saving cooling method for an air conditioner controls the air conditioner in a manner that: measures an indoor temperature T and an indoor humidity H of a cooling object room provided with the air conditioner; calculates a discomfort index B from the indoor temperature and the indoor humidity; reduces the indoor humidity by lowering a cooling temperature or an air supply amount when the calculated discomfort index B is higher than a predetermined discomfort index A; and increases the indoor humidity by raising the cooling temperature or the air supply amount when the calculated discomfort index B is lower than the predetermined discomfort index A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an energy-saving cooling control in which a change in sensible temperature is reduced by controlling an air supply amount of an air conditioner indoor unit.

  Control in a conventional air conditioner is only temperature control. This is a cooling operation targeting a set temperature, and humidity control is not considered at all. Indoor temperature is not constant by temperature control alone.

Although the conventional air conditioner has automatic air volume control, it is air volume control as an auxiliary role for temperature control to reach the set temperature quickly. This air volume control is not for humidity control but for maintaining a constant temperature and not for energy saving.
When the air volume is “automatic”, the “light breeze” operation takes a long time and the air is cooled with a large amount of dehumidification. Therefore, the room is dry and the sensible temperature does not become constant, and the cooling uses a lot of energy. End up.

  Patent Document 1 discloses an air conditioner that performs at least one of a humidifying operation, a heating operation, a dehumidifying operation, and a cooling operation so as to shift the indoor temperature and humidity to a target temperature and a target humidity within a comfort range indicated by temperature and humidity. An air conditioning control device for instructing is disclosed, and when the indoor temperature and humidity are transferred to a comfortable range, the energy efficiency in each operation mode of humidification operation, heating operation, dehumidification operation, and cooling operation is considered. The target temperature and target humidity are set so that the operating load of the air conditioner is minimized, and the target temperature is corrected so that the temperature difference between the outdoor temperature and the set target temperature is a predetermined value or less. I have to.

Japanese Patent No. 3165402

  When cooling with an air conditioner, the amount of dehumidification is large, and more energy is usually used for dehumidification than energy used to lower the temperature. For this reason, some buildings and homes use humidifiers even in the summer when the room is dry.

Even if dehumidification is performed in the summer when the outside air humidity is high and the room is dried, the moisture always enters from the outside, and therefore the room humidity constantly changes depending on the outside air humidity. Even if the temperature is constant, the sensory temperature will not be constant if the humidity changes.
Cooling with less dehumidifying operation is effective for energy saving, but conventional air conditioners are not aimed at cooling with less dehumidifying operation.
There is a method for controlling the area of the heat exchanger, but the method of cooling only a part of the heat exchanger to reduce the dehumidification area decreases the cooling capacity of the air conditioner.

  In the air conditioning control device disclosed in the above-mentioned Patent Document 1, the enthalpy of the outside air and the enthalpy of the inside air are calculated, and by comparing these, the effectiveness of taking in the outside air is judged, and it is judged that it contributes to energy saving. In order to save energy by giving a damper switching instruction to the air conditioner, it is essential to take in outside air, and it is difficult to apply it to a general air conditioner.

  Therefore, the problem to be solved by the present invention is a system that controls the humidity in the direction of energy saving while controlling the dehumidification amount without reducing the cooling capacity, reducing the energy used for dehumidification, and keeping the temperature of experience constant. Is to provide.

The first feature of the present invention is to control the humidity by the air volume.
When the air conditioner indoor unit cooler temperature is constant,
The stronger the supply air volume, the higher the supply air temperature and the higher the dew point temperature of the supply air.
If the dew point temperature rises, the amount of dehumidification decreases and the room humidity increases.
The weaker the supply air flow, the lower the supply air temperature and the lower the dew point temperature of the supply air.
If the dew point temperature decreases, the amount of dehumidification increases and the room humidity decreases.
In the present invention, by utilizing this principle, the air supply air volume of the air conditioner indoor unit is varied, and the humidity sensor controls the room humidity.

The second feature of the present invention is that temperature control is changed to sensible temperature control.
The current air conditioner is only cooled by temperature control, and the humidity at the time of cooling is not controlled. Explaining with the discomfort index, which is one of the intuitive indexes, the discomfort index is calculated with temperature and humidity, but even if the temperature is constant due to temperature control, the humidity changes with the course, so cooling The indoor discomfort index is not constant.

ここで、ｔは温度、ｈは湿度である。同じ温度でも、湿度によって不快と感じたり、快適と感じたりする。
体感的な指標は不快指数を使ってもよいが、その他の指標でもよい。 The discomfort index DI is expressed by the following formula, for example.

Here, t is temperature and h is humidity. Even at the same temperature, it feels uncomfortable or comfortable due to humidity.
As the sensory index, the discomfort index may be used, but other indices may be used.

ここで、ｔは温度、ｈは湿度、ｖは風速（ｍ／ｓｅｃ）である。 For example, the sensory temperature T _m is expressed by the following equation, and an element of wind speed is added in addition to temperature and humidity.

Here, t is temperature, h is humidity, and v is wind speed (m / sec).

In the present invention, by controlling the humidity of the air conditioner, the temperature is brought close to the target sensory temperature.
By the way, in the same discomfort index, the cooling with lower enthalpy of room air takes away the energy in the air, so more energy is used to lower the enthalpy. Cooling with higher indoor air enthalpies means that less energy is used to lower the enthalpy because less energy is lost in the air.
In the present invention, the air supply amount of the air conditioner indoor unit is controlled so as to take away sensible heat and not take away latent heat. In addition, energy-saving cooling is performed by controlling the temperature and humidity of the room air in such a direction that the enthalpy becomes higher while maintaining the same discomfort index.

That is, the first configuration of the present invention is as follows.
While measuring the room temperature T and the room humidity H of the room to be cooled with the air conditioner, the discomfort index B is calculated from the room temperature and the room humidity.
When the discomfort index B is higher than the preset discomfort index A, the room humidity is lowered by lowering the cooling temperature or the air supply air volume.
When the discomfort index B is lower than the preset discomfort index A, the room humidity is increased by increasing the cooling temperature or increasing the supply air volume.
An air conditioner energy-saving cooling method characterized by controlling an air conditioner.

The second configuration of the present invention is as follows:
As a control target of the air conditioner, a discomfort index A is set in advance, and a humidity H1 and a temperature T1 that are variables defining the discomfort index A are set,
Start the operation of the indoor unit of the air conditioner at the maximum air volume and cool it to the set temperature T1,
Comparing the discomfort index A with the discomfort index B measured in the room to be cooled;
When A <B, lower the cooling temperature,
When A> B, raise the cooling temperature,
When A = B, the humidity H2 in the room to be cooled is compared with the set humidity H1,
When H2> H1, the air volume is decreased by one step, and when the minimum air volume is maintained, the current air volume is maintained.
When H2 <H1, the air volume is increased by one step. When the maximum air volume is reached, the current air volume is maintained.
When H2 = H1, it is an energy-saving cooling method for an air conditioner that performs control to maintain the current air volume.

The third configuration of the present invention is as follows.
A temperature sensor for measuring the temperature of the air conditioner, a humidity sensor for measuring humidity,
A discomfort index calculating means for calculating a discomfort index from the output of the temperature sensor and the output of the humidity sensor;
When the discomfort index B is higher than the preset discomfort index A, the room humidity is lowered by lowering the cooling temperature or the air supply air volume.
When the discomfort index B is lower than the preset discomfort index A, the room humidity is increased by increasing the cooling temperature or increasing the supply air volume.
An air conditioner energy-saving cooling control device comprising means for controlling an air conditioner.

The fourth configuration of the present invention is as follows.
A temperature sensor for measuring the temperature of the room where the air conditioner is installed;
A humidity sensor for measuring the humidity in the room;
A discomfort index calculating means for calculating a discomfort index from the output of the temperature sensor and the output of the humidity sensor;
As a control target of the air conditioner, a discomfort index A is set in advance, and a humidity H1 and a temperature T1 that are variables defining the discomfort index A are set,
Start the operation of the indoor unit of the air conditioner at the maximum air volume and cool it to the set temperature T1,
Comparing the discomfort index A with the discomfort index B calculated by the discomfort index calculating means;
When A <B, lower the cooling temperature,
When A> B, raise the cooling temperature,
When A = B, the humidity H2 in the room to be cooled is compared with the set humidity H1,
When H2> H1, the air volume is decreased by one step, and when the minimum air volume is maintained, the current air volume is maintained.
When H2 <H1, the air volume is increased by one step. When the maximum air volume is reached, the current air volume is maintained.
An energy-saving cooling control apparatus for an air conditioner is provided with means for executing control for maintaining the current air volume when H2 = H1.

Thus, in the present invention, the air supply amount of the air conditioner indoor unit is controlled.
Humidity is controlled not only by temperature control but also by controlling the supply air volume of the air conditioner indoor unit so that the room has an arbitrary sensory temperature such as a discomfort index.
The air supply volume of air conditioner indoor units is often three-stage air conditioners, but the greater the number of stages, the finer the humidity can be controlled.

If an air conditioner indoor unit is provided with a humidity sensor and air conditioning is controlled so that the room humidity becomes high, the energy for depriving latent heat is reduced and energy is saved.
If the temperature and humidity can be controlled, the temperature control, the supply air volume control, and the humidity control can be linked to perform control that keeps a sensory index such as a discomfort index constant.
In addition to linking temperature control, supply air volume control, and humidity control so that the same sensible temperature can be achieved, control as enthalpy can be performed in the direction of energy saving.

The supply air cooled through the cooler of the air conditioner indoor unit
If the wind speed is fast, the cooling time is shortened, so that the supply air temperature becomes high and the dew point temperature rises, so that the supply air with a small dehumidification amount is obtained.
If the wind speed is slow, the cooling time becomes longer, so the supply air temperature is lowered and the dew point temperature is lowered, so that the supply air with a large amount of dehumidification is obtained.
In this way, the humidity can be controlled by the air volume.

Using a sensory index such as the discomfort index and controlling the temperature and humidity in the room so that the index is set, the sensory temperature can be kept constant, and discomfort and overcooling can be prevented.
Cooling that does not lower the humidity by lowering the room temperature can save energy because it can cool the room with a high enthalpy of room air at the same discomfort index.
The higher the room temperature is, the more energy is saved, but the room temperature changes depending on the outside air and indoor conditions. Try to be an exponent.

  According to the present invention, energy control required for dehumidification can be reduced and energy-saving cooling can be performed by performing cooling with less change in the sensible temperature by humidity control and less dehumidifying operation.

It is a flowchart of the control system of the air-conditioner which concerns on embodiment of this invention. It is the graph which measured the amount of power consumption every day by switching the normal cooling and the discomfort index cooling every other day while the set temperature of the air conditioner is the same. It is a graph of the average value of the temperature of the two thermohygrometers measured by switching the normal air conditioning and the discomfort index cooling every other day while the set temperature of the air conditioner is the same. It is a graph in which the relative humidity of two thermohygrometers measured by switching between normal cooling and discomfort index cooling every other day are converted into absolute humidity, with the same temperature set for the air conditioner.

Hereinafter, the embodiment of the present invention will be specifically described. However, the present invention is not limited to this embodiment, and can be modified within the scope of the present invention.
Table 1 shows the relationship between absolute humidity and enthalpy corresponding to each temperature and humidity (relative humidity). The relationship between the air supply temperature of the air conditioner and enthalpy will be described in Table 1.

（D.A.は乾燥空気：Dry Air）

(DA is Dry Air)

In Table 1, the case of cooling 30 ° C. and 55% air to 20 ° C. and 100% and 10 ° C. and 100% is compared.
When air at 30 ° C. and 55% is cooled to 20 ° C., it is cooled to the dew point temperature to 20 ° C. and 100%, but the same 0.0147 g / g D.D as when the absolute humidity is 30 ° C. and 55%. A. Therefore, the temperature is lowered by 10 ° C. without being dehumidified.
When air at 30 ° C. and 55% is cooled to 10 ° C., it is cooled to the dew point temperature to 10 ° C. and 100%, and the absolute humidity is lowered as shown in equation (1).
0.0147 g / gD.A. -0.0076 g / gD.A. = 0.0071 g / gD.A. (1) Formula

To compare enthalpy, there is a 10 ° C difference between 30 ° C and 20 ° C, but there is a 20 ° C difference between 30 ° C and 10 ° C.
In the case of 20 ° C. and 100%, since the room temperature cannot be maintained unless the air volume is doubled, the enthalpy is also doubled for calculation.
In order to cool 30 ° C. and 55% air to 20 ° C. and 100%, it is necessary to change the amount of heat of enthalpy represented by the formula (2).
(67.68 J / gD.A.−57.41 J / gD.A.) × 2 = 2.54 J / gD.A. (2) Formula

In order to cool 30 ° C. and 55% air to 10 ° C. and 100%, it is necessary to change the amount of heat of enthalpy represented by the formula (3).
67.68 J / gD.A.−29.28 J / gD.A. = 38.4 J / gD.A. (3)

38.4 J / gD.A. ÷ 20.54 J / gD.A. = 1.87, so cooling to 10 ° C and 100% requires 1.87 times cooling energy than cooling to 20 ° C and 100% It becomes.
Since the energy that takes away sensible heat is the same, this difference in enthalpy is the difference in energy that takes away latent heat.
Thus, the effect of controlling the humidity is great.

In the example of Table 1, when the supply air temperature is 20 ° C., it is not necessary to take away latent heat.
Since the supply air temperature difference can be covered by the air volume, the room temperature can be maintained even if the air supply temperature is increased by 20 ° C. by increasing the air volume twice.
If the air volume can be changed and air can be supplied at 20 ° C, the absolute humidity will increase, so the energy used for dehumidification will not be necessary.
If the humidity can be controlled, it is not necessary to lower the absolute humidity. Therefore, cooling with high enthalpy is possible, and energy saving cooling with enthalpy difference is achieved.

  Table 2 shows the relationship between room humidity, enthalpy and discomfort index during cooling at 28 ° C.

Even if the temperature is the same 28 ° C. If the humidity changes, the discomfort index becomes as shown in Table 2.
Any index may be used as long as it is not a discomfort index, but can be any index that represents an arbitrary sensory temperature calculated by temperature and humidity.

Absolute humidity is most affected by outside air humidity, and may be lower than 28 ° C and 40% if the outside air humidity is low, or higher than 28 ° C and 70% when the outside air humidity is high, such as in rainy weather. Sometimes.
There are factors such as the number of people in the room, but the humidity is up to the point, and the discomfort index is up to the point.
As described above, the sensory temperature varies greatly only with the temperature control of the air conditioner. However, if the humidity control can be performed using the relationship shown in Table 1, cooling with a desired sensory index can be achieved.
The temperature-based cooling shown in Table 2 is changed to the sensory temperature-based cooling shown in Table 3.

Table 3 shows temperature, relative humidity, absolute humidity, enthalpy, and discomfort index when the room has a discomfort index of 75.
In Table 3, the temperature decreases as it goes down, but the humidity increases as it goes down, and the absolute humidity and enthalpy also increase.
Table 3 shows that if the temperature is the same, the lower the temperature and the higher the humidity, the more air will be taken.

In Table 3, the cooling that consumes the most energy is a temperature of 28.0 ° C. and a humidity of 45%, and the cooling that consumes the least energy is a temperature of 25.0 ° C. and a humidity of 81%. If the discomfort index is the same, the lower the temperature and the higher the humidity, the higher the enthalpy and the cooling will not take up energy.
Even if the air supply volume of the air conditioner indoor unit is increased to increase the indoor humidity as much as possible, the humidity also varies depending on the outside air humidity.
If the goal is energy saving and discomfort index, control the air flow rate of the air conditioner indoor unit so that the humidity is as high as possible, and control the temperature so that the discomfort index is set according to the humidity at that time. High cooling can be achieved.

If the setting of an arbitrary discomfort index and humidity is used as a reference, the discomfort index that has been set can be achieved by controlling the supply air volume of the air conditioner indoor unit so as to be the set humidity and controlling the temperature.
In this manner, by combining temperature and humidity with energy saving performance by enthalpy and comfort by temperature sensory index, it is possible to perform cooling that achieves both energy saving performance and comfort.
Even if the detailed setting is not performed, when the “energy saving cooling” switch is pressed, the cooling may be performed with the discomfort index 75 in the direction of increasing the humidity as a target.

An example of the cooling control method of the present invention in the case of performing cooling based on the sensible temperature by setting an arbitrary discomfort index and humidity will be described with reference to the flowchart of FIG. FIG. 1 shows a case where a discomfort index 75 and a set humidity 70% are assumed.
If the outside air is dry, the humidity may not reach 70% even if the air volume is maximized. In that case, since the discomfort index is 75 or less, the temperature is adjusted by increasing the set temperature.
The target is the set discomfort index, the temperature is controlled according to the discomfort index at that time, and the air volume is controlled based on the humidity measurement result.
It may be considered that the control of each element is performed simultaneously.

Hereinafter, each step will be described.
In step S100 [A: discomfort index setting], the discomfort index A is manually set to an arbitrary index (A = 75 in this example).
In step S110, if the discomfort index A and the humidity (in this example, the set humidity is 70%) are determined, the temperature is obtained by calculation, so automatic adjustment is performed. In this example, the set humidity is automatically set to 70%. However, any humidity can be set.
In step S120, the operation is started with the maximum air volume.
In step S130, the temperature is lowered until the discomfort index A = 75 at a set humidity of 70%.
In step S140, the following control is started at regular time intervals.
In step S150 [B: indoor discomfort index], the current indoor discomfort index B is measured.
In step S160, [A: discomfort index setting] and [B: indoor discomfort index] are compared.
If A <B, the cooling temperature is lowered by 1 ° C. in step S170.
If A> B, the cooling temperature is raised by 1 ° C. in step S180.
If A = B, the process proceeds to “air volume control by humidity” in step S190.
If the indoor humidity is 70% or more, the air volume is decreased by one step in step S200.
If the indoor humidity is 70% or less, the air volume is increased by one step in step S210.
If the indoor humidity is 70%, the current air volume is maintained in step S220.
After steps S200 to S220, if the humidity changes, the temperature also changes. Therefore, the process returns to step S140 [start every fixed time], and the control is repeated.

Discomfort index cooling effect is the same for both building air conditioners and home air conditioners, so measure with home air conditioners and compare power consumption.
In contrast to the conventional “normal cooling” that targets the temperature, the cooling that targets the sensory temperature will be referred to as “discomfort index cooling”.

The graph in Fig. 2 shows that a watt checker is attached to an outlet between 6 mats in the home, and the temperature setting of the air conditioner is still 28 ° C. Today is “■ normal cooling”, and the next day is “□ discomfort index cooling”. The driving method is switched every other day, and the daily power consumption is measured.
This is a more accurate comparison than the power consumption of the same month last year.
The air-conditioning operation time is 8 hours from 23: 00 to 7:00 the following day, and since it is nighttime, there is no influence of sunlight on the indoor or outdoor unit.
Even if there is an influence of the outside air temperature, since the measurement is performed every other day, the outside air load is leveled, and there is not much influence on the comparison of the total power consumption during the measurement period.
There is no TV and no lighting in the room.
Since there is only one person in the room, the cooling load in the room can be kept constant for 8 hours.

In the total measurement for 54 days from July 27, 2014 to September 18, 2014, the normal cooling day is 34.62 kwh, and the discomfort index cooling day is 24.52 kwh. There was a power saving effect.
The difference in daily power consumption is due to the influence of the outside air temperature. It can be seen that the temperature of the outside air gradually decreases toward September and the amount of power consumption also decreases.
Whether the power consumption of the graph is affected by outside air humidity, “■ Normal cooling day” is a graph with a lot of fluctuations up and down on the whole, but “□ Discomfort index cooling day that is hardly affected by outside air humidity” "" Is characteristic of a graph with less vertical variation.

In the graph, the power saving rate decreases as the power consumption decreases.
Not only the outside temperature, but also the humidity has gradually decreased since July.
If the humidity is low, the power saving effect of the discomfort index cooling is also low, so the power saving rate is also low.
At home, there are few people going in and out and there is often no ventilation, so there are few opportunities for outside air to come in, and there is not much energy used for dehumidification.
In the case of buildings, the more people there are, the more energy used for dehumidification the more ventilation and outside air intrusion, the more energy is used for dehumidification than for homes.

Since the power saving effect of only cooling is considered in this example, the annual power saving may be about 5%, but in summer there are many buildings that use around 50% of energy consumption for cooling. If 30% of the power can be saved, the power demand will be reduced by 15%.
Two thermo-hygrometers were installed at a position 40 cm from the floor, and the average value of the two measured at 7:00 every day was shown in the graph of FIG. This is a graph of temperature.
In FIG. 3, it can be seen that even when the set temperature is 28 ° C., the temperature is actually cooler.
“● Normal cooling” is often on the 25 ° C. line, and “〇 Discomfort index cooling” is mostly on the 26 ° C. line.
“Oh discomfort index cooling” has little variation in temperature and is lined up in a row on the 26 ° C. line.
“● Normal cooling” is 1 ° C. lower than “〇 Discomfort index cooling”.

Since the air conditioner measures the temperature at the suction port, even if the temperature near the ceiling is 28 ° C, the “normal wind” “breeze” cannot circulate the air to the floor and the cold air remains submerged. As a result, there is a temperature difference between the top and bottom of the room, and the temperature near the floor has dropped to 25 ° C.
The “strong wind” with “〇 discomfort index cooling” has a stronger force to circulate the air on the floor than “breeze”, so the temperature difference between the top and bottom of the room decreases, and the temperature near the floor rises slightly to 26 ° C. ing.
The difference is how much the air on the floor can be stirred.

Since people are actually in the lower part of the room, you can see that it is meaningless to just set the temperature.
Even if it is set to 28 ° C., it is meaningless at 25 ° C. If it is "o discomfort index cooling" at 26 ° C, the discomfort index is 75.4 when the humidity is 70%.
The “● normal cooling” with low temperature and humidity has a discomfort index of 74 or less. Therefore, if the discomfort index is 75.4, it can be said that the cooling is not wasteful.

FIG. 4 shows relative humidity [%] as absolute humidity [g / gD. It is the graph converted into A]. Similar to the temperature, the average value of two thermohygrometers measured at 7:00 every day is shown.
To see the amount of water vapor in a room, it must be absolute humidity, not relative humidity, which varies with temperature.
“● Normal cooling” is a graph with less vertical variation.
The relative humidity ranges from 60% to 69%.
“Oh discomfort index cooling” is a graph with many vertical variations.
The relative humidity ranges from 63% to 76%.

On the right side of the graph, there are many days when the humidity decreased. This is probably because the outside air humidity is low. In that range, the difference between “● normal cooling” and “〇 discomfort index cooling” is not much.
Since both temperatures are stable and there is no change in the temperature difference, it can be seen that the difference in power consumption is reduced due to humidity.
Even if the temperature is set with an air conditioner, the humidity is still good, and there are days when the humidity is converted to temperature and becomes 3 ° C.
If the temperature is so different, the perceived difference will be large.
If the set temperature is changed according to the humidity so that the discomfort index is 75, there will be no difference in sensation and no waste of energy.

  The present invention is a system for controlling the humidity in the direction of energy saving while controlling the dehumidification amount without reducing the cooling capacity, reducing the energy used for dehumidification, and maintaining the temperature of experience constant, for home use and for office use. It can be suitably used in the field of air conditioning.

Claims (4)

While measuring the room temperature T and the room humidity H of the room to be cooled with the air conditioner, the discomfort index B is calculated from the room temperature and the room humidity.
When the discomfort index B is higher than the preset discomfort index A, the room humidity is lowered by lowering the cooling temperature or the air supply air volume.
When the discomfort index B is lower than the preset discomfort index A, the room humidity is increased by increasing the cooling temperature or increasing the supply air volume.
An air conditioner energy-saving cooling method characterized by controlling the air conditioner. As a control target of the air conditioner, a discomfort index A is set in advance, and a humidity H1 and a temperature T1 that are variables defining the discomfort index A are set,
Start the operation of the indoor unit of the air conditioner at the maximum air volume and cool it to the set temperature T1,
Comparing the discomfort index A with the discomfort index B measured in the room to be cooled;
When A <B, lower the cooling temperature,
When A> B, raise the cooling temperature,
When A = B, the humidity H2 in the room to be cooled is compared with the set humidity H1,
When H2> H1, the air volume is decreased by one step, and when the minimum air volume is maintained, the current air volume is maintained.
When H2 <H1, the air volume is increased by one step. When the maximum air volume is reached, the current air volume is maintained.
An energy-saving cooling method for an air conditioner, characterized in that control is performed to maintain the current air volume when H2 = H1. A temperature sensor for measuring the temperature of the room where the air conditioner is installed;
A humidity sensor for measuring the humidity in the room;
A discomfort index calculating means for calculating a discomfort index from the output of the temperature sensor and the output of the humidity sensor;
When the discomfort index B is higher than the preset discomfort index A, the room humidity is lowered by lowering the cooling temperature or the air supply air volume.
When the discomfort index B is lower than the preset discomfort index A, the room humidity is increased by increasing the cooling temperature or increasing the supply air volume.
An energy-saving cooling control apparatus for an air conditioner, comprising means for controlling the air conditioner. A temperature sensor for measuring the temperature of the room where the air conditioner is installed;
A humidity sensor for measuring the humidity in the room;
A discomfort index calculating means for calculating a discomfort index from the output of the temperature sensor and the output of the humidity sensor;
As a control target of the air conditioner, a discomfort index A is set in advance, and a humidity H1 and a temperature T1 that are variables defining the discomfort index A are set,
Start the operation of the indoor unit of the air conditioner at the maximum air volume and cool it to the set temperature T1,
Comparing the discomfort index A with the discomfort index B calculated by the discomfort index calculating means;
When A <B, lower the cooling temperature,
When A> B, raise the cooling temperature,
When A = B, the humidity H2 in the room to be cooled is compared with the set humidity H1,
When H2> H1, the air volume is decreased by one step, and when the minimum air volume is maintained, the current air volume is maintained.
When H2 <H1, the air volume is increased by one step. When the maximum air volume is reached, the current air volume is maintained.
An energy-saving cooling control apparatus for an air conditioner, comprising means for executing control for maintaining the current air volume when H2 = H1.

Images