JP6859068B2 - Control method of air conditioner, air conditioner - Google Patents

Description

The present invention relates to an air conditioner, a control method of an air conditioner that supplies air within a preset temperature / humidity range to a target space.

Conventionally, an air conditioner in which a filter, a hot / cold water coil, a reheating coil, a humidifier, a fan and the like are incorporated in a casing is known (see, for example, Patent Document 1). This air conditioner sucks in air, removes dust with a filter, cools, dehumidifies or heats with a cold / hot water coil, further heats with a reheat coil to adjust the temperature, and adjusts the temperature with a humidifier, and relative humidity with a humidifier. By adjusting the temperature and relative humidity, the air is supplied to the target space, that is, the target space is air-conditioned.

Such air conditioners include those that inhale only the outside air to perform air conditioning (hereinafter referred to as all-fresh air conditioning) and those that inhale the outside air and the return air from the target space to perform air conditioning (hereinafter, referred to as all-fresh air conditioning). There is (called general air conditioning). At this time, the air conditioner controls the air conditioning so that the temperature of the target space or the blowout temperature becomes constant in the case of all-fresh air conditioning, aiming at a set constant temperature.

JP 2015-137826

However, in recent years, from the viewpoint of energy saving, it is becoming common to set an appropriate set temperature of 28 ° C. for cooling and 20 ° C. for heating. And, of course, people may come and go in the target space. In this case, the sensible temperature felt by a person is affected by the amount of exercise, clothes, and the like, and also changes depending on the temperature difference from the ambient temperature.

Therefore, if the temperature difference from the ambient temperature is too large, discomfort such as being too cold may occur. On the other hand, if the temperature difference from the ambient temperature is small, the effect of air conditioning cannot be felt, which may impair comfort.
Therefore, an air conditioner, which is a control method for an air conditioner that can improve comfort, is provided.

The control method of the air conditioner according to the embodiment measures the ambient temperature, which is the ambient temperature of the target space, and sets the air conditioning target temperature, which is the upper limit temperature for controlling the air supplied to the target space, within the temperature and humidity range. In addition, the temperature difference is set to a preset temperature with respect to the ambient temperature, and the air conditioning control is performed with the set air conditioning target temperature as the upper limit.

The figure which shows typically the structure of the air conditioner of an embodiment. The figure which shows an example of the installation mode of the air conditioner schematically. The figure which shows the flow of processing by an air conditioner The figure which shows an example of the control mode of the all-fresh air-conditioning in a cooling dehumidification mode. The figure which shows an example of the control mode of general air conditioning in a cooling dehumidification mode. The figure which shows an example of the control mode in a cooling reheat mode.

Hereinafter, embodiments will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, the air conditioner of the present embodiment (hereinafter referred to as air conditioner 1) supplies air within a preset temperature / humidity range to the target space, and controls the control device 2 and air conditioning. The main body 3 is provided.

The control device 2 is composed of a sequencer, a computer, or the like (not shown), and controls the air conditioning main unit 3, that is, air conditioning control. When a plurality of air conditioners 1 are provided, the air conditioner 1 may be centrally managed by a higher-level management device. Although the details will be described later, this control device 2 functions as a setting unit for setting the air conditioning target temperature and a control unit for performing air conditioning control with the air conditioning target temperature as the upper limit.

The air conditioning main body 3 has a filter 4, a cold / hot water coil 5, a reheating coil 6, a humidifier 7, a fan 8, a temperature / humidity sensor 9, and the like in a casing (not shown).
The filter 4 is a so-called dustproof filter, which removes dust, dirt, dust, etc. contained in the intake air.

The cold / hot water coil 5 cools or heats the air that has passed through the filter 4 by using cold water or hot water supplied from the cold / hot water heat source machine 5a provided outside. In FIG. 1, cold water or hot water supplied from the cold / hot water heat source machine 5a is collectively referred to as cold / hot water.
The reheating coil 6 reheats the air that has passed through the cold / hot water coil 5 as needed by using hot water supplied from the cold / hot water heat source machine 6a provided outside.

The humidifier 7 humidifies the air that has passed through the hot water coil as needed. In the present embodiment, the humidifier 7 employs an evaporation type that uses steam supplied from an external evaporator 7a, but a vaporization type that vaporizes and humidifies water or a mist of water. It is also possible to adopt a spray type or the like that sprays on.
The fan 8 introduces air into the air conditioning main body 3 from outside the casing and supplies the air that has passed through the humidifier 7 to the target space for air conditioning, and is provided for intake and air supply.

In the present embodiment, the temperature / humidity sensor 9 is provided with a temperature / humidity sensor 9a on the intake side and a temperature / humidity sensor 9b on the air supply side, and measures the temperature and relative humidity of the intake and supply air, respectively. As will be described later, the temperature / humidity sensor 9 functions as an ambient temperature measuring unit that measures the ambient temperature, which is the ambient temperature of the target space that is the target of air conditioning.

Next, the operation of the above configuration will be described.
The air conditioner 1 having the above configuration is relatively large, unlike the so-called air conditioner used in ordinary households. For example, as shown in FIG. 2A as an example, the entire building 10 is air-conditioned. It is used in an installation mode such as the air conditioner 1A for performing air conditioning and the air conditioner 1B for air conditioning the booth 11 which is individually partitioned in the building 10. Such a large air conditioner 1 is called an air handling unit or an air conditioner for short.

In this case, the air conditioner 1A is connected to the building 10 by the supply duct 12A, and the target space for air conditioning is the building 10. This air conditioner 1A performs all-fresh air conditioning that sucks only outside air. In this case, the surroundings of the target space are outdoors, and the ambient temperature is the temperature of the outside air. Further, the building 10 can be, for example, an office building, a commercial building, a factory, or the like. The air conditioning temperature for the entire building 10 is set from the operation panel 10a provided in the control room or the like.

The air conditioner 1B is connected to the booth 11 by a supply duct 12B and a return air duct 13, and the target space for air conditioning is the booth 11. The air conditioner 1B performs general air conditioning by sucking in the outside air and the return air from the booth 11 which is the air conditioning target space. In this case, the periphery of the target space is inside the building 10, and the ambient temperature is the temperature inside the building 10, that is, the temperature of the air supplied from the air conditioner 1A in the present embodiment.

Further, the booth 11 can be, for example, a store, a company office, a work room dedicated to painting, or the like. The air conditioning temperature for the booth 11 is individually set from the operation panel 11a provided in the booth 11.
Further, as shown in FIG. 2B, the air conditioner 1 may be installed in a manner such as the air conditioner 1C that air-conditions the booth 11 in the building 10 that is not air-conditioned. This is assumed to be, for example, a painting booth in a factory.

By the way, in recent years, from the viewpoint of energy saving, it is becoming common to set an appropriate set temperature to 28 ° C. for cooling and 20 ° C. for heating. However, of course, people may come and go in the target space. For example, in the case of FIG. 2A, a person goes in and out of the building 10 and goes in and out of the booth 11. In this case, the sensible temperature felt by the person entering and exiting the target space is affected by the amount of exercise, clothes, and the like, and also changes depending on the temperature difference from the ambient temperature. That is, even in the same booth 11, it is considered that the sensible temperature is different between, for example, a person who is doing desk work and a person who is moving his / her body by doing some work.

At this time, if the temperature difference from the ambient temperature is too large, discomfort such as being too cold may occur. On the other hand, if the temperature difference from the ambient temperature is small, the effect of air conditioning cannot be felt, which may impair comfort. Since there are people in the target space, it is desired to improve the comfort. On the other hand, from the viewpoint of energy saving, it is also required that the power consumption is unnecessarily increased, that is, the generation of unnecessary load is suppressed.

Therefore, the air conditioner 1 of the present embodiment improves comfort while suppressing the generation of unnecessary loads. Hereinafter, three types of control modes A to C by the air conditioner 1 of the present embodiment will be described. For the sake of simplification of the description, first, the overall flow and specific control of the processing by the air conditioner 1 will be described. Aspects will be described in Control Aspect A: Cooling Dehumidification Mode (All Fresh Air Conditioning), followed by Control Aspect B: Cooling Dehumidification Mode (General Air Conditioning) and Control Aspect C: Cooling Reheat Mode.

The cooling dehumidification mode and the cooling reheat mode are described in detail below, but are control modes that are classified based on the dew point temperature of the intake air. Roughly speaking, the cooling dehumidification mode cools the intake air to the dew point temperature. This is a control that involves dehumidification, and the cooling reheat mode is a control that does not involve a process that cools the intake air to the dew point temperature.

<Control mode A: Cooling and dehumidifying mode (all-fresh air conditioning)>
Hereinafter, a control mode of all-fresh air conditioning in the cooling / dehumidifying mode will be described.
The air conditioner 1 first measures the ambient temperature in the process shown in FIG. 3 (S1). In the case of the present embodiment, the ambient temperature is the temperature of the outside air in the case of the air conditioner 1A and the temperature in the building 10 in the case of the air conditioner 1B. Subsequently, the air conditioner 1 sets the air conditioning target temperature, which is the upper limit of control, based on the measured ambient temperature (S2). Then, the air conditioner 1 performs air conditioning processing, that is, air conditioning control using the set air conditioning target temperature (S3).

In this case, as is well known, in the air diagram shown in FIG. 4, the temperature / humidity range (R) is a line segment (L1) indicating the upper limit of the temperature (hereinafter referred to as the upper limit temperature) and the lower limit of the temperature (hereinafter referred to as the upper limit temperature). A line segment (L2) indicating the lower limit temperature), a line segment (L3) indicating the upper limit of relative humidity (hereinafter referred to as upper limit humidity), and a line segment indicating the lower limit of relative humidity (hereinafter referred to as lower limit humidity) (hereinafter referred to as lower limit humidity). It is set as a range surrounded by L4).

In the present embodiment, the temperature / humidity range is set to a temperature range of 21 ° C. to 28 ° C. and a relative humidity range of 40% to 70% so that a person in the target space does not feel uncomfortable. .. This temperature / humidity range is set by laws and regulations in the case of offices and the like, and in the case of painting booths, the range specified or recommended by the conditions of use of paints.

Here, the conventional air conditioning control as a comparative example will be briefly described. In the conventional air conditioning control, any one point (P100) in the temperature / humidity range (R) is statically set, and the temperature at the outlet of the cold / hot water coil 5 is set to the lower limit temperature in the temperature / humidity range (R) and air conditioning. It is assumed that the humidity at the target temperature is cooled to the upper limit humidity, that is, the dew point temperature (P101) at the intersection of the line (L2) and the line (L3), and then reheated to the temperature set by the reheating coil 6. (P102), humidify as needed.

However, in such conventional air conditioning control, the cooling and reheating loads are unnecessarily generated because the cooling / hot water coil 5 always cools the air to the dew point temperature and then reheats the air regardless of the temperature and humidity of the intake air during cooling. It ends up. Therefore, the air conditioner 1 first measures the ambient temperature in step S1 and sets the air conditioning target temperature in step S2.

At this time, the air conditioner 1 targets a temperature between the upper limit temperature and the lower limit temperature of the temperature / humidity range (R) and having a temperature difference (ΔT) preset with respect to the ambient temperature. Set to the air conditioner target temperature, which is the upper limit of the controlled temperature of the air supplied to the space. That is, the air conditioner 1 dynamically sets the air conditioning target temperature, which is the upper limit for controlling the temperature / humidity range (R), based on the ambient temperature.

Further, the temperature difference (ΔT) is set to 5 ° C. in this control mode. This temperature difference (ΔT) allows you to feel the effect of air conditioning when you move in a space with a temperature difference, that is, when you move from the outside to the inside of the building 10, and you feel that it is too cold, for example. Is set to prevent. In this case, the temperature difference (ΔT) is set in the range of 3 ° C. to 8 ° C., more preferably about 5 ° C. as in the present control mode, with respect to the ambient temperature.

This is because if a person entering the target space determines that the air conditioning set temperature is inappropriate, the temperature setting tends to be changed by 3 ° C or more, and exercise or work is performed in the target space during the hot summer months. When doing so, it is preferable to set the temperature lower, but if the temperature is changed to a set temperature that is too low than the outside air temperature, the discomfort when moving out of the target space will increase, so the temperature difference will be 8 ° C or less. This is because it is considered that the temperature difference (ΔT) is preferably in the range of 3 ° C. to 8 ° C.
Furthermore, when the temperature difference (ΔT) is set to about 5 ° C., the discomfort felt by those entering and exiting the target space is suppressed, and at the same time, the discomfort when leaving due to the set temperature being too low is also suppressed, and the temperature difference (ΔT) is further suppressed. ) Can be suppressed too much to reduce the deterioration of energy saving.

Now, it is assumed that the state of the supply air, that is, the outside air is 31 ° C. and the relative humidity is 80% as shown in P10 in FIG. This is a condition that can occur in summer or in the rain. At this time, the temperature and relative humidity of the supply air are measured by the temperature / humidity sensor 9a, and the absolute humidity of the intake air is calculated from the measurement results. Then, the air conditioner 1 sets a temperature that is a temperature difference (ΔT) from the temperature of the outside air, that is, 31-5 = 26 ° C. as the air conditioning target temperature.

Subsequently, in step S3, the air conditioner 1 uses the air conditioning target temperature to perform air conditioning control with the set air conditioning target temperature as the upper limit. Specifically, the air conditioner 1 specifies the upper limit humidity at the air conditioning target temperature, that is, the point (P11) on L3 at the air conditioning target temperature in the temperature / humidity range (R), and specifies the dew point temperature (P12) of the P11. To do.

When the dew point temperature is specified, the air conditioner 1 determines that the dew point temperature (P10a) of the outside air here is higher than the dew point temperature (P12) of the upper limit humidity (P11), that is, the absolute humidity of the intake air is the air conditioning target. When the temperature is higher than the absolute humidity of the upper limit humidity, the intake air (P10) is cooled to the dew point temperature (P12) of the upper limit humidity. At this time, the intake air is dehumidified by removing excess water.

Subsequently, the air conditioner 1 adjusts the temperature of the air by reheating the air cooled to the dew point temperature to the air conditioning target temperature (P11). As a result, the air in the state of P11, that is, the air adjusted to a predetermined temperature difference (ΔT) with respect to the ambient temperature is supplied from the air conditioner 1 to the building 10 which is the target space.

As described above, the air conditioning control when the dew point temperature of the intake air is higher than the dew point temperature of the upper limit humidity at the air conditioning target temperature and dehumidification is required corresponds to the cooling dehumidification mode. As will be described in the control mode C described later, the air conditioning control when the dew point temperature of the intake air is equal to or less than the dew point temperature of the upper limit humidity at the air conditioning target temperature corresponds to the cooling reheat mode.

In this case, as is clear from FIG. 4, the cooling load when the outside air (P10) is cooled to the dew point temperature (P12) of the upper limit humidity by the air conditioner 1 is the cooling load (P10 → P101) by the conventional air conditioning control described above. The load required for the transition of) is smaller than that. That is, the load on the heat source machine can be reduced.

Further, although it depends on the statically set temperature of P100, the reheat load when the air conditioner 1 reheats from the dew point temperature (P12) to the air conditioning target temperature (P11) is based on the above-mentioned conventional air conditioning control. It is also possible to make it smaller than the reheat load (load for reheating and humidification required for the transition from P101 to P102 and P102 to P100).

Since the air supplied to the target space has a predetermined temperature difference (ΔT) from the ambient temperature, the effect of air conditioning can be felt as described above, and for example, it feels too cold. People who move into the building 10 from the outside can feel comfortable. Of course, since the air conditioning target temperature is set within the temperature / humidity range (R), the person in the target space does not feel uncomfortable as described above.

As a result, it is possible to provide a comfortable state for a person entering and exiting the target space while maintaining a comfortable state for a person who stays in the target space. Therefore, comfort can be improved while suppressing the occurrence of unnecessary load.

<Control mode B: Cooling and dehumidifying mode (general air conditioning)>
Hereinafter, a control mode of general air conditioning in the cooling / dehumidifying mode will be described with reference to FIG. However, since the configuration of the air conditioner 1 and the processing flow are the same as the control mode in the above-mentioned all-fresh air conditioning, the description will be described with reference to FIGS. 1 to 3. In this control mode, an air conditioner 1C that air-conditions the booth 11 in the building 10 that is not air-conditioned, as shown in FIG. 2B, is assumed.

As shown in FIG. 5, the state of the outside air outside the building 10 is, for example, P10, the temperature is 31 ° C., the relative humidity is 80%, and the state of the air inside the building 10 is, for example, P20. Temperature In other words, it is assumed that the ambient temperature in this control mode is 30.5 ° C. and the relative humidity is 68%.

The air conditioner 1 measures the ambient temperature in step S1 of the process shown in FIG. 3, similarly to the all-fresh air conditioning. In this case, the ambient temperature is measured by, for example, a temperature sensor 10c provided in the building 10. The temperature sensor 10c is configured to be able to output the measured temperature to the air conditioner 1 either directly or indirectly via a higher-level management device or the like.

When the ambient temperature is measured, the air conditioner 1 sets the temperature within the temperature / humidity range (R), which is the temperature difference (ΔT) from the ambient temperature in step S2, as the air conditioner target temperature in step S2. The temperature difference (ΔT) with respect to the ambient temperature is also set to 5 ° C. in this control mode, and in this case, the air conditioning target temperature is set to 30.5-5 = 25.5 ° C.

Then, the air conditioner 1 executes the air conditioning process using the set air conditioning target temperature in step S3. Specifically, the air conditioner 1 specifies a point on L3 at the air conditioning target temperature, that is, an upper limit humidity (P21) at the air conditioning target temperature based on the temperature / humidity range (R), and the dew point of the upper limit humidity. The temperature (P22) is specified.

When the dew point temperature is specified, the air conditioner 1 cools the air conditioner 1 because the dew point temperature (P23a) of the air-fuel mixture (P23) of the intake air and the return air is higher than the dew point temperature (P22) of the upper limit humidity (P21). Air conditioning is controlled by the dehumidification mode. More specifically, the air conditioner 1 cools the intake air (P23) to the dew point temperature (P22) of the upper limit humidity to dehumidify excess water, and then reheats the air to the air conditioning target temperature (P21). Adjust the temperature.

As a result, the air in the state of P21, that is, the air adjusted to a predetermined temperature difference (ΔT) with respect to the ambient temperature is supplied from the air conditioner 1 to the building 10 which is the target space.
In this case, the cooling load when the air conditioner 1 cools the supply air (P23) to the dew point temperature (P22) of the upper limit humidity is smaller than the cooling load by the conventional air conditioning control shown in FIG.

Further, although it depends on the statically set temperature, the reheat load when the air conditioner 1 reheats from the dew point temperature (P22) to the air conditioning target temperature (P21) is the load by the conventional air conditioning control described above (P). It is also possible to make the air at the dew point temperature smaller than the reheat load and the humidification load when transitioning to the state of P100.

Since the air conditioning target temperature, which is the temperature of the air supplied to the target space, has a predetermined temperature difference (ΔT) from the ambient temperature, the effect of air conditioning can be felt as described above. For example, a person who has moved into the building 10 from the outside can feel comfortable without feeling that it is too cold. Further, since the air conditioning target temperature is set within the temperature / humidity range (R), the person in the target space does not feel uncomfortable as described above.

As a result, it is possible to provide a comfortable state for a person entering and exiting the target space while maintaining a comfortable state for a person who stays in the target space. Therefore, comfort can be improved while suppressing the occurrence of unnecessary load.

<Control mode C: Cooling reheat mode>
Hereinafter, the control mode in the cooling reheat mode will be described with reference to FIG. However, since the configuration of the air conditioner 1 and the processing flow are the same as those of the above-mentioned all-fresh air conditioner, they will be described with reference to FIGS. 1 to 3. In addition, this control mode corresponds to both all-fresh air conditioning and general air conditioning.

Similar to the all-fresh air conditioner, the air conditioner 1 measures the ambient temperature in step S1 of the process shown in FIG. 3, and in step S2, the temperature is a temperature difference (ΔT) from the ambient temperature and is in the temperature / humidity range (R). Set the temperature inside to the air conditioning target temperature. At this time, as shown in FIG. 6, it is assumed that the air conditioning target temperature is set between the upper limit temperature and the lower limit temperature of the temperature / humidity range (R).

Further, it is assumed that the dew point temperature of the intake air is equal to or less than the dew point temperature of the upper limit humidity at the air conditioning target temperature, that is, the absolute humidity of the intake air is equal to or less than the absolute humidity of the upper limit humidity at the air conditioning target temperature. In such a situation, the air conditioner 1 controls in the air conditioning process in step S3 by the cooling reheat mode using the air conditioning target temperature.

The air conditioner 1 passed through the cold / hot water coil 5 in a range (region I) in which the intake air temperature is higher than the air conditioning target temperature and the absolute humidity of the intake air is equal to or higher than the absolute humidity of the lower limit humidity at the air conditioning target temperature. Control the air temperature so that it reaches the air conditioning target temperature. Specifically, the air conditioner 1 sets the intake air to the air conditioning target temperature by performing sensible heat cooling by the cold / hot water coil 5.

In this case, the intake air is not cooled to the dew point temperature. That is, in the cooling reheat mode, the intake air is not dehumidified. Therefore, unlike the conventional control mode described above, the cold / hot water coil 5 does not cool to the dew point temperature, and reheat from the dew point temperature to the air conditioning target temperature is not performed, so that the cooling load and the reheat load are not performed. , The humidification load can be reduced.

As described above, in the cooling reheat mode, the control for cooling the intake air to the dew point temperature, that is, the dehumidification is not performed, so that at least the cooling load can be reduced as compared with the conventional control mode. The same applies to the following regions II to V.

Further, in the air conditioner 1, the cold / hot water coil 5 is used in a range (region II) in which the intake air temperature is higher than the air conditioning target temperature and the absolute humidity of the intake air is lower than the absolute humidity of the lower limit humidity at the air conditioning target temperature. The sensible heat cooling is performed on the intake air, and the humidifier 7 is used for steam humidification to bring the intake air to the target air conditioning temperature. Similarly, in this case as well, since cooling to the dew point temperature and reheating from the dew point temperature are not performed, the cooling load and the reheat load can be reduced.

Further, in the air conditioner 1, when the intake air temperature is equal to or higher than the lower limit temperature and lower than the air conditioning target temperature and the absolute humidity of the intake air is in a range lower than the lower limit humidity (region III), the steam from the humidifier 7 is generated. By humidifying, the intake air is kept within the target temperature range (R). In this case, since cooling by the cold / hot water coil 5 and reheating by the reheating coil 6 are not performed, the cooling load and the reheating load can be reduced.

Further, in the air conditioner 1, when the intake air temperature is equal to or lower than the lower limit temperature and equal to or lower than the air conditioning target temperature, and the absolute humidity of the intake air is equal to or higher than the lower limit humidity, that is, within the temperature / humidity range (R). Air within the target temperature range (R) is supplied by blowing air from the fan 8. In this case, since the cooling by the cold / hot water coil 5, the reheating by the reheating coil 6, and the steam humidification by the humidifier 7 are not performed, the cooling load, the reheating load, and the humidifying load can be reduced.

Further, when the temperature of the intake air is lower than the lower limit temperature and the absolute humidity of the intake air is in the range (region IV) lower than the lower limit humidity, the air conditioner 1 passes through the reheating coil 6. By targeting the temperature of the air in the air to a temperature corresponding to the upper limit humidity, the air within the target temperature range (R) is supplied by performing reheating by the reheating coil 6 and steam humidification by the humidifier 7. be able to. In this case, since the cooling / hot water coil 5 is not cooled, the cooling load can be reduced.

Further, when the intake air temperature is lower than the air conditioning target temperature and the absolute humidity of the intake air is in a range (region V) higher than the upper limit humidity, the air conditioner 1 passes through the reheating coil 6. By targeting the temperature of the air in the above temperature to a temperature corresponding to the upper limit humidity, the air within the target temperature range (R) can be supplied by performing reheating by the reheating coil 6. In this case, since the cooling / hot water coil 5 does not cool and the humidifier 7 does not humidify, the cooling load and the humidifying load can be reduced.

According to the embodiment described above, the following effects can be obtained.
The air conditioner 1 measures the ambient temperature, which is the ambient temperature of the target space, and sets the air conditioner target temperature, which is the upper limit temperature for controlling the air supplied to the target space, within the temperature / humidity range and the ambient temperature. On the other hand, the temperature difference is set to a preset value. The air conditioner 1 employs a control method for performing air conditioning control with the set air conditioning target temperature as the upper limit.

As described above, even within the same target space, it is considered that the sensible temperature differs between a person who is doing desk work and a person who is moving the body by doing some work, for example. Moreover, even in the same target space, it is considered that the sensible temperature is different between the person who stays in the target space and the person who goes in and out of the target space. If the temperature difference between the ambient temperature (ambient temperature) of the target space and the temperature inside the target space is small, the person who enters the target space may not feel the effect of air conditioning and may be dissatisfied. is there.

In this case, if the air conditioning temperature in the target space is statically set, in other words, if the air conditioning control is performed so as to maintain the temperature in the target space at a constant temperature regardless of the ambient temperature, the target space The temperature difference between the internal temperature and the ambient temperature becomes constant, and the effect of air conditioning may not be felt.

Therefore, the air conditioner 1 sets the air conditioning target temperature to a preset temperature difference with respect to the ambient temperature. As a result, the target space is supplied with air adjusted based on the air conditioning target temperature, that is, a new upper limit temperature that dynamically changes according to the ambient temperature. In this case, since the surroundings and the target space are always maintained at a set temperature difference, a person entering the target space can feel the effect of air conditioning.

Further, since a predetermined temperature difference is maintained from the ambient temperature, for example, the ambient temperature does not change and the effect of air conditioning cannot be felt, and the target space is excessive because the temperature difference is a predetermined temperature from the ambient temperature. You don't feel too cold because it's too cold. Further, since the air conditioning target temperature is set to a temperature within the temperature / humidity range, comfort is not impaired not only for those who enter and leave the target space but also for those who continue to stay in the target space.
Therefore, comfort can be improved.

In addition, the temperature measuring unit (temperature / humidity sensor 9, temperature sensor 10c) that measures the ambient temperature, which is the ambient temperature of the target space, and the air conditioning target temperature, which is the upper limit temperature for controlling the air supplied to the target space, are heated. A setting unit (control device 2) that sets a temperature difference within the humidity range and preset with respect to the ambient temperature, and a control unit (control device 2) that performs air conditioning control up to the set air conditioning target temperature. An air conditioner (air conditioner 1) provided with the above can also have the effect of improving comfort as in the control method described above.

By the way, in the above-mentioned conventional air conditioning control, when any one point in the temperature / humidity range (R) is statically set, the intake air is set to the dew point temperature of the lower limit temperature and the upper limit humidity in the temperature / humidity range (R). After cooling, it is common to reheat to the temperature set by the reheating coil 6. In this case, there is a problem that a cooling load and a reheat load are unnecessarily generated because the air is always cooled to the dew point temperature and then reheated regardless of the temperature and humidity of the intake air during cooling.

Therefore, the air conditioner 1 compares the dew point temperature of the intake air with the dew point temperature of the upper limit humidity at the air conditioning target temperature, and when the dew point temperature of the intake air is higher than the dew point temperature of the upper limit humidity, the dew point temperature of the intake air is the upper limit humidity. On the other hand, when the dew point temperature of the intake air is equal to or lower than the dew point temperature of the upper limit humidity, the control for cooling the intake air to the dew point temperature is not performed (cooling reheat mode).

In this case, in the cooling / dehumidifying mode, the intake air is not the dew point temperature of the lower limit temperature and the upper limit humidity within the temperature / humidity range (R) as in the conventional control mode (see P101 in FIG. 4), but the upper limit at the air conditioning target temperature. It is cooled to the dew point temperature of humidity (see P10a in FIG. 4 and P23a in FIG. 5). Therefore, the cooling load when cooling to the dew point temperature can be reduced as compared with the conventional control mode.

Further, in the cooling reheat mode, since the process of cooling to the dew point temperature is not performed in the first place, the cooling load can be reduced as compared with the conventional control mode in which the cooling is uniformly performed to the dew point temperature. Further, it is possible to reduce at least one of the cooling load, the reheat load, and the humidification load, although it depends on which state the intake air is in the regions IV and the temperature / humidity range (R) shown in FIG. it can.
Therefore, it is possible to prevent the cooling load and the reheat load from being unnecessarily generated.

Further, the air conditioner 1 sets the temperature difference (ΔT) from the ambient temperature in the range of 3 ° C. to 8 ° C. As a result, a temperature difference is generated between the ambient temperature and the temperature of the target space so that the effect of air conditioning can be fully experienced. Therefore, comfort can be improved. In this case, by setting the temperature to 5 ° C. as in the embodiment, the effect of air conditioning can be felt without significantly increasing the load on the heat source unit.

(Other embodiments)
The numerical values of temperature and humidity shown in the embodiment are examples, and are not limited thereto.
In the embodiment, a configuration example using the cold / hot water coil 5 is shown, but instead of the cold / hot water coil 5, a cold water coil that only cools can be adopted.

In the embodiment, the temperature difference (ΔT) is set to a constant value, but the temperature difference (ΔT) can be set based on at least one of the temperature and humidity around the target space. In this case, the temperature difference (ΔT) can be dynamically changed according to fluctuations in ambient temperature and humidity.
For example, based on the ambient temperature, the higher the ambient temperature, the larger the temperature difference (ΔT) can be. As a result, the effect of air conditioning can be further felt.
Further, even if the temperature is the same, it is considered that the lower the humidity, the lower the sensible temperature. Therefore, the lower the humidity, the smaller the temperature difference (ΔT) can be. As a result, it is possible to achieve both improvement in comfort and reduction in load, that is, power consumption.

Further, the temperature difference (ΔT) can be changed between the cooling dehumidification mode and the cooling reheat mode. For example, as in region I shown in FIG. 6, when sensible heat cooling is performed in the cooling reheating mode, the relative humidity becomes high, so that the temperature difference (ΔT) should be larger than in the cooling / dehumidifying mode at the same temperature. Therefore, the sensible temperature can be lowered and the comfort can be improved.

The number of air conditioners 1 and the number of booths 11 shown in FIGS. 2A and 2B of the embodiment are examples, and the number of air conditioners 1 is appropriately set according to the type and number of target spaces. be able to. Further, the air conditioner 1A and the air conditioner 1B shown in FIG. 2A may be configured to connect various data to a higher-level management device (not shown) so as to be communicable.

Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

In the drawings, 1, 1A, 1B, 1C are air conditioners (air conditioners), 2 are control devices (air conditioners, control units, setting units), 3 are air conditioner main units (air conditioners), 9, 9a, 9b indicates a temperature / humidity sensor (temperature measuring unit), 10 indicates a building (target space, surrounding the target space), 10c indicates a temperature sensor (temperature measuring unit), and 11 indicates a booth (target space).

Claims (4)

It is a control method of an air conditioner that supplies air within a preset temperature / humidity range to the target space.
At the time of cooling , the ambient temperature, which is the ambient temperature of the target space, is measured, and the air conditioning target temperature, which is the upper limit temperature for controlling the air supplied to the target space, is within the temperature / humidity range and the ambient temperature. preset set to the temperature difference, had row air conditioning control with a maximum of the air-conditioning target temperature set for,
In the air conditioning control, the dew point temperature of the intake air is compared with the dew point temperature of the upper limit humidity within the temperature and humidity range at the air conditioning target temperature, and when the dew point temperature of the intake air is higher than the dew point temperature of the upper limit humidity, the intake air is operated. A control method for an air conditioner that cools the intake air to the dew point temperature of the upper limit humidity, but does not cool the intake air to the dew point temperature when the dew point temperature of the intake air is less than or equal to the dew point temperature of the upper limit humidity. The control method for an air conditioner according to claim 1, wherein the temperature difference is set based on at least one of the temperature and humidity around the target space. The control method for an air conditioner according to claim 1 or 2, wherein the temperature difference is set in the range of 3 ° C. to 8 ° C. An air conditioner that supplies air within a preset temperature and humidity range to the target space.
A temperature measuring unit that measures the ambient temperature, which is the ambient temperature of the target space,
A setting unit that sets the air conditioning target temperature, which is the upper limit temperature for controlling the air supplied to the target space, within the temperature / humidity range and a preset temperature difference with respect to the ambient temperature.
It is equipped with a control unit that controls air conditioning with the set air conditioning target temperature as the upper limit.
During cooling, the control unit compares the dew point temperature of the intake air with the dew point temperature of the upper limit humidity within the temperature and humidity range at the air conditioning target temperature, and the dew point temperature of the intake air is higher than the dew point temperature of the upper limit humidity. If it is high, the process of cooling the intake air to the dew point temperature of the upper limit humidity is performed, while if the dew point temperature of the intake air is lower than the dew point temperature of the upper limit humidity, the process of cooling the intake air to the dew point temperature is not performed. Machine.

Images