JPH05296532A - Surrounding air conditioner - Google Patents

Abstract

PURPOSE:To improve a comfortable feeling within an object region in view of humidity in a surrounding air conditioner in which surrounding air OA is cooled by a cooling means, and there are provided an air supplying means for supplying the cooled air to an air conditioner region and a control means for adjusting an output of the cooling means and an amount of supplied air in response to a sensing of temperature in such a manner that the temperature within the region becomes a target temperature. CONSTITUTION:There are provided control means 13 and 17 comprising a calculation means 17a which determines the lower dew point temperature (tpm) for a target device based on a sensing of temperature and humidity in surrounding air OA, the lower an absolute humidity (xo) of the surrounding air OA is, and the higher a temperature (to) of the surrounding air OA is, and an adjusting means for adjusting an output H of a cooling means 4 and an amount of supplied air Q in such a manner that a temperature (ti) in the detected region becomes a target temperature (tii) while a dew formation point temperature (tp) of the device becomes a dew formation point temperature (tpm) for a target device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air supply means for cooling the outside air by a cooling means and supplying the cooled air to the air-conditioning target area as an air supply, and a temperature detection so that the temperature in the area becomes a target temperature. The present invention relates to an outside air conditioning system including a control unit that adjusts the output of the cooling unit and the amount of air supplied.

[0002]

2. Description of the Related Art Conventionally, in the outside air conditioner as described above, the following (a) or (b) has been adopted as a concrete mode of adjusting the output of the cooling means and the supply air amount by the control means.

(A) Temperature in detection zone ti and target temperature ti
The output H of the cooling means is adjusted according to the deviation Δti from i,
The air supply amount Q in a predetermined proportional relationship with the output H of the cooling means
Adjust.

(B) Temperature in detection zone ti and target temperature ti
The supply air amount Q is adjusted according to the deviation Δti from i, and the output H of the cooling means is adjusted so as to maintain the supply air temperature ts at a constant value tss with respect to the adjustment of the supply air amount.

[0005]

By the way, in the adjustment mode of (a) above (see FIG. 6), the outside air condition is point o1.
(Temperature to1, absolute humidity xo1, relative humidity ro1), when the internal load is G, the internal temperature ti is set to the target temperature ti.
i, the output of the cooling means is adjusted to H1 according to the deviation Δti, and the air supply amount is Q1 (= Fq (H1)) in a predetermined proportional relationship according to the adjusted output H1 of the cooling means.
Is adjusted to the device dew point temperature tp1 and the in-zone state is point a.
1 (temperature tii, relative humidity ri1),

When the inside load G is the same and the outside air condition is at the point o2, the outside air humidity ro2 is lower than the point o1, while the inside temperature ti is set to the target temperature tii, and the output of the cooling means is more than H1. Is also adjusted to a smaller value H2, and the air supply amount is smaller than Q1 in accordance with the cooling means output H2.
(= Fq (H2)), but since the amount of air supply is small for the same in-zone load G, the device dew point temperature becomes a value tp2 lower than tp1, and the in-zone state is point a2.
(Temperature tii, relative humidity ri2).

When the inside load G is the same and the outside air state is at the point o3, the outside air temperature to3 is higher than the point o1, whereas the inside temperature ti is set to the target temperature tii, and the output of the cooling means is Adjusted to a value H3 that is greater than H1,
Further, the supply air amount is also adjusted to a value Q3 (= Fq (H3)) larger than Q1 according to the output H3 of the cooling means.
However, the device dew point temperature becomes a value tp3 higher than tp1 and the in-zone state becomes a point a3 (temperature tii, relative humidity ri3).

On the other hand, in the adjustment mode (b) (see FIG. 7), the outside air condition is point o1 (temperature to1, absolute humidity xo).
1, the relative humidity ro1), the output of the cooling means so that the supply air temperature ts (in this example, the supply air temperature ts = approximate to the device dew point temperature tp) becomes the set value tss when the internal load is G. Is adjusted to H4, and the supply air amount is adjusted to Q4 according to the deviation Δti so that the in-zone temperature ti becomes the target temperature tii at the supply air temperature tss, and the device dew point temperature is tp4 (= tsss). ) Is the point a4
(Temperature tii, relative humidity ri4),

When the inside load G is the same and the outside air condition is the point o2, the outside air humidity ro2 is lower than the point o1 and the supply air temperature ts is set to the set value tss (= tp4). Is adjusted to a value H5 that is smaller than H4, but the internal temperature ti is set to the target temperature ti in the same situation as in the case where the internal load G and the supply air temperature ts (= tss) are the same as the previous case.
For i, the air supply amount is the same value Q4 as in the previous case, the device dew point temperature is tp4 (= tss), and the in-zone state is also point a4.

[0010] Further, when the area load G is the same, the outside air condition is point o4.
When the set value tss of the supply air temperature ts is the dew point temperature, the absolute humidity xo4 of the outside air OA is lower than the absolute humidity xoL when the set point temperature ts is the dew point temperature. In this state, the output of the cooling means is adjusted to a value H6 (<H5) with the supply air temperature ti as the set value tii. Regarding the supply air amount, the internal load G and the supply air temperature ts
(= Tss) in the same situation as the previous case, the temperature t in the zone
Although i is the target temperature tii, the same value Q4 as described above is obtained, and the in-zone state becomes the point a5 (temperature tii, relative humidity ri5).

When the inside load G is the same and the outside air condition is at the point o3, the outside air temperature to3 is higher than the point o1 while the supply air temperature ts is set to the set value tss (= tp4).
Therefore, the output of the cooling means is adjusted to a value H7 which is larger than H4.
And the supply air temperature ts (= tss) are the same as in the previous case, the internal temperature ti is set to the target temperature tii, but the same value Q4 as in the previous case is obtained, and the device dew point temperature is the point o1 or the point o.
As in the case of 2, the in-zone state is also point a at tp4 (= tss).
It becomes 4.

As can be seen from the above, with respect to the decrease in the absolute humidity xo of the outside air OA, in the case of the form (a), the lower the absolute humidity xo of the outside air OA, the relative humidity r in the region.
i also decreases, and in the form of (b), the relative humidity ri in the region is kept at a constant value ri4 until the absolute humidity xo of the outside air OA reaches a specific value xoL, and when it becomes lower than the specific value xoL, the outside air OA Although the relative humidity ri in the area also decreases as the absolute humidity xo of the outside air decreases, the temperature to of the outside air OA increases.
The relative humidity ri in the region tends to increase as o increases, and in the case of the form (b), the relative humidity ri in the region does not change depending on the temperature to of the outside air OA.

However, under the same absolute humidity xo, the higher the temperature to of the outside air OA is, the lower the relative humidity ro of the outside air OA becomes, and although the temperature to is high, the outside air state becomes sensationally refreshing. On the other hand, as described above, as the outside air temperature to rises, the relative humidity ri in the region changes to the outside air temperature to
If the outside air temperature to is low and the outside air temperature to is only the same as when the outside air temperature to is low, it is felt that the inside of the area is relatively moist, although the temperature ti is low, in comparison with the situation where the outside air OA is refreshed. There was a problem that I could not get a comfortable feeling.

An object of the present invention is to improve comfort in terms of humidity by adjusting the output of the cooling means and the amount of supplied air in a rational manner.

[0015]

A first characteristic configuration of an air conditioner according to the present invention is an air supply means for cooling outside air by a cooling means and supplying the cooled air to the air conditioning target area as air supply.
Also, in the configuration including a control means for adjusting the output of the cooling means and the supply air amount based on the temperature detection so that the in-zone temperature becomes the target temperature, the control means, based on the temperature and humidity detection of the outside air, The lower the absolute humidity of, and
The calculation means for determining the target device dew point temperature which is lower as the temperature of the outside air is higher, and the output of the cooling means and the air supply amount are set so that the temperature in the detection zone becomes the target temperature when the device dew point temperature becomes the target device dew point temperature. It is provided with an adjusting means for adjusting, and the action and effect thereof are as follows.

[0016]

In other words, in the operation of keeping the in-zone temperature ti at the target temperature tii, the lower the apparatus dew point temperature tp, the lower the relative humidity ri in the zone for the same in-zone load situation. Therefore, in FIG. 5, the state points o1 and o of the outside air OA are
Absolute humidity of outside air xo
The lower is the temperature of the outside air OA, and the higher is the temperature of the outside air OA as shown with respect to the state points o1 and o3 of the outside air OA, the two points of o2 and o5, or the two points of o4 and o6. , Low target device dew point temperature tpm (tpm1 to tpm
6) is determined, and the output H of the cooling means and the supply air amount Q are adjusted so that the detection area temperature ti becomes the target temperature tii in a state where the apparatus dew point temperature tp becomes the target apparatus dew point temperature tpm in each outside air state. By adopting the above-mentioned adjustment form that the absolute humidity xo decreases, the outside air OA
In addition to lowering the relative temperature ri in the range with respect to the decrease in relative humidity ro, the relative humidity ri in the range can be decreased with respect to the decrease in relative humidity ro of the outside air OA due to the increase in temperature to.

[0017]

As a result of the above operation, according to the first characteristic configuration of the present invention, depending on the outside air condition, although the outside air has a high temperature but a low relative humidity, it feels refreshed, but relatively, The conventional problem that the temperature in the area is low but the relative humidity is high and it feels damp can be effectively suppressed, and the comfort in terms of humidity can be greatly improved.

[Second Characteristic Configuration of the Present Invention] In a second characteristic configuration of the present invention, the calculation means is the target temperature of the contact point at the tangent line drawn from the outside air state point to the saturation line in the psychrometric chart. It is to be given as a device dew point temperature.

That is, the gradient of the tangent line drawn from the outside air state point to the saturation line in the air diagram is the maximum gradient in the straight line group drawn from the outside air state point to each point on the saturation line.

Therefore, if the above-mentioned first characteristic construction is carried out in such a manner that the temperature of the contact point at such a tangent line is given as the target device dew point temperature, the cooling line with the maximum gradient is revealed in each outside air state, and the energy consumption is reduced. Thus, a high dehumidifying effect can be obtained while increasing the operating efficiency of the cooling means.

[0021]

EXAMPLES Next, examples will be described.

In FIG. 1, reference numeral 1 denotes a package type air conditioner, which branches a return air passage 3 from an air conditioning target area 2 into a circulation return air passage 3a and an exhaust return air passage 3b, and The outside air passage 4 from outside is used as the ventilation outside air passage 4a and the heat source outside air passage 4
b, and the return air passage 3a for circulation and the outside air passage 4a for ventilation are joined to be connected to the air supply passage 6 to the air-conditioning target area 2 via the heat exchanger 5 for temperature control, and a heat source. The outside air passage 4b and the exhaust return air passage 3b are merged and connected to the exhaust passage 8 to the outside via the heat source heat exchanger 7.

D1 to D4 are dampers, and these dampers D1 to D4 are used to change the air duct state to the following (a), (b),
Alternately switching to the three states of (c).

(A) Air-conditioning target area 2 guided by the return air passage 3
Return air RA from the circulation return air passage 3a and exhaust return air passage 3b
External air O that is split into
A is diverted into the ventilation air passage 4a and the heat source air passage 4b,
Accordingly, the mixed air of the return air RA guided by the circulation return air passage 3a and the outside air OA guided by the ventilation outside air passage 4a is passed through the temperature control heat exchanger 5, and in parallel with this, the exhaust return air passage 3
A partial ventilation circulation state in which the mixed air of the return air RA guided by b and the outside air OA guided by the heat source external air passage 4b is passed through the heat source heat exchanger 7 as a heat radiation target in cooling and as a heat absorption target in heating.

(B) Air-conditioning target area 2 guided by the return air passage 3
The entire amount of the return air RA from the air is passed through the heat source heat exchanger 7 together with the outside air OA guided by the heat source outside air passage 4b, and in parallel with this, only the outside air OA guided by the ventilation outside air passage 4a is adjusted for temperature control. All outside air conditions to pass to 5.

(C) Air-conditioning target area 2 guided by the return air passage 3
The entire amount of return air RA from the heat exchanger 5 for temperature control,
In parallel with this, the outside air O guided from outside by the outside air passage 4
A total circulation state in which the entire amount of A is passed through the heat source heat exchanger 7.

The heat exchanger 5 for temperature control and the heat exchanger 7 for heat source constitute a heat pump together with the compressor 9 and the expansion valve 10. By switching the refrigerant circulation mode, the heat exchanger 5 for temperature control is used as an evaporator. As the heat source heat exchanger 7 and the heat source heat exchanger 7 as a condenser, while in heating, the temperature control heat exchanger 5 functions as a condenser, and the heat source heat exchanger 7 as an evaporator. Make it work.

Reference numeral 11 is an air supply fan, and 12 is an exhaust fan.

Numeral 13 indicates a room temperature ti detected by the room temperature sensor 14.
And a target temperature tii according to a deviation Δti between the target area 2 and the room temperature ti of each room 2a in the target area 2 to adjust the air supply amount q to each room 2a.

Further, 15 is the static pressure of the air passage sp in the air supply passage 6.
Is a wind passage pressure sensor, and 16 is a wind passage pressure sensor 1
Based on the detection information of 5, the airway static pressure sp in the air supply passage 6
Is a fan controller for adjusting the output of the air supply fan 11 so as to make the set value spp.

Reference numeral 17 denotes an air conditioner controller that controls the operation of the air conditioner 1 based on the detection information of various sensors. The sensors include a sensor 18 that detects the temperature ts of the supply air SA and a temperature control heat exchanger 5. The sensor 19 for detecting the surface temperature tp, the sensor 20 for detecting the temperature ti of the return air RA (that is, the temperature inside the zone), the sensor 21 for detecting the relative humidity ri of the return air RA (that is, the relative humidity within the zone), and the outside air OA A sensor 22 for detecting the temperature to and a sensor 23 for detecting the relative humidity ro of the outside air OA are provided.

Next, a mode of operation control in cooling will be described with reference to FIGS. 2 and 3.

When the operation start command is given, the air conditioner controller 17 starts the operation of the air supply fan 11 and the exhaust fan 12 by setting the air passage state to the full circulation state, and also in the refrigerant circulation mode for cooling, the compressor. 9 is started at the maximum output to start the start-up operation in which the temperature control heat exchanger 5 is cooled at the maximum output Hmax.

The air volume changing device 13 is in a fully open state because the detected room temperature ti is higher than the target temperature tii in each room 2a being in the cooling stopped state until then, and the air conditioner 1 to the target area 2
The air supply amount Q (= Σq) to the maximum is maximum.

By this start-up operation, the in-region temperature ti (room temperature) of the target region 2 gradually decreases, and along with it, the accompanying absolute dehumidifying function of the temperature control heat exchanger 4 also gradually decreases the in-region absolute humidity.

When the internal temperature ti (room temperature) drops to the target temperature tii (state point i1 in FIG. 3), the air flow rate changer 13 supplies air to each chamber 2a so as to maintain the internal temperature ti at the target temperature tii. The amount q is adjusted so that the total air supply amount Q is decreased.

On the other hand, the air conditioner controller 17 completes the start-up operation when the detected return air temperature ti falls to the target temperature tii, and subsequently starts either the all-outside air operation or the normal operation. ..

Regarding whether to perform the all outside air operation or the normal operation, the detected temperature ti of the return air RA and the detected relative humidity ri, the detected surface temperature tp of the temperature control heat exchanger 5, the detected supply air temperature ts, the outside air OA detection temperature to and detection relative humidity r
Based on o, the specific enthalpy hi of the return air RA, the specific enthalpy hp of saturated air at the detected surface temperature tp, and
The sensible heat ratio SHF in the region is calculated, and it is determined whether or not the reciprocal 1 / R of the load factor R (= compressor output / compressor maximum output) is greater than or equal to the judgment value Z given by the following equation. If is greater than or equal to the judgment value Z, all outside air operation is performed, and the reciprocal 1 /
When R is less than the determination value Z, normal operation is performed.

Z = {0.245. (To-tp). (T
o-ts)} / {SHF · (hi-hp) · (ti-t
s)}

In the all outside air operation, the air conditioner controller 17 sets the air passage state to the all outside air state, and then the outside air O
Based on the detected temperature to and the detected relative humidity ro of A, the target device dew point temperature tpm according to the outside air condition is determined, and the deviation Δtp between the target device dew point temperature tpm and the detected surface temperature tp of the temperature control heat exchanger 5 is set. Accordingly, in the all-outside air state, the surface temperature tp of the heat exchanger 5 for temperature adjustment (that is, the temperature corresponding to the device dew point temperature) is set to the target device dew point temperature tpm under the adjustment of the air supply amount Q by the air flow amount device 13. Compressor 9
The output H of the temperature control heat exchanger 5 is adjusted by adjusting the output of.

The calculation unit 17a uses the outside air OA as shown in FIG.
Temperature to and relative humidity ro, and target device dew point temperature t
The target device dew point temperature tpm is determined on the basis of the setting relationship of the three parties of pm. In FIG. 3, the outside air state is the temperature toA at the point oA and the relative humidity roA (absolute humidity xoA). Target device dew point temperature is tp
It is set to mA.

Further, as the above setting relation, in other words, the temperature of the contact point p at the tangent line s drawn from the state point of the outside air OA to the saturation line L on the air diagram is given as the target device dew point temperature tpm. For example, outside air OA absolute humidity x
It is determined that the lower the o and the higher the temperature to, the lower the target device dew point temperature tpm.

In the above all outside air operation, the temperature t in the zone
i is the target temperature t due to the adjustment of the air supply amount by the air flow rate changer 13.
While being adjusted and maintained at ii, the internal humidity ri gradually decreases to the equilibrium value (state point i2) determined by the target device dew point temperature tpm and the internal load, but the detected relative humidity ri of the return air RA is decreased in this humidity decrease. It becomes less than or equal to the set lower limit value riu (that is, occurs when the above equilibrium value is lower than the set lower limit value riu), or the variable device 13 reaches the throttling limit, or the load in the region sharply decreases, etc. Due to the above, the detected temperature ti of the return air RA is set lower limit temperature tiu (tiu <tii, for example, tiu = tii-2.
When the temperature becomes less than or equal to ° C deg), the air conditioner controller 17 switches the operating state from the all outside air operation to the normal operation.

When the above equilibrium value is higher than the set lower limit humidity riu, the whole outside air operation is continued until the detected temperature ti of the return air RA becomes the set lower limit temperature tiu or the operation stop command is given. It

On the other hand, in normal operation, the air conditioner controller 17 adopts a partial ventilation circulation state, and in this partial ventilation circulation state, the deviation Δ between the detected supply air temperature ts and the target supply air temperature tss.
The output H of the temperature control heat exchanger 5 is adjusted by adjusting the output of the compressor 9 so that the supply air temperature ts is adjusted and maintained at the target supply air temperature tss in accordance with ts. The in-zone temperature ti (room temperature) is maintained at the target temperature tii by adjusting the supply air amount by.

The equilibrium state when the above normal operation is continued is shown by the chain double-dashed line in FIG. 3. When the normal outside operation is switched to the full outside air operation, the in-zone state is the state point i3 at the time of switching from the full outside air operation. Alternatively, the humidity gradually changes from i3 ′ toward the state point i4 in the equilibrium state indicated by the chain double-dashed line toward the humidity increasing side.

For the implementation of this normal operation, the air conditioner controller 1
7 sequentially repeats the selection judgment between the all-outside air operation and the normal operation, and when the load factor R becomes equal to or larger than the calculation judgment value Z in this judgment, the operation state is switched to the all-outside air operation.

In each of the switching from the all-outside air operation to the normal operation and the switching from the normal operation to the all-outside air operation, even if the following switching condition is satisfied for a predetermined time ΔT after the switching, The switching is restrained so that the hunting-like switching of the operating state is prevented.

[Other Embodiments] Next, other embodiments will be listed.

In the above-described embodiment, in the all-outside air operation, the surface temperature tp (of the temperature control heat exchanger 5 is adjusted while the air supply amount Q is adjusted by the air flow rate changing device 13 so as to maintain the internal temperature ti at the target temperature tii. That is, the output H of the temperature adjustment heat exchanger 5 is adjusted so that the device dew point temperature) becomes the target device dew point temperature tpm. However, instead of this, in the all outside air operation, the in-zone temperature ti and the target temperature tii. Deviation from
Based on ti, while adjusting the output H of the temperature control heat exchanger 5 so that the in-zone temperature ti becomes the target temperature tii, by interventional control of the air supply fan 11 and the air flow rate changer 13,
The surface temperature tp of the heat exchanger 5 for temperature control is set to the target device dew point temperature t.
You may employ | adopt the structure which adjusts the air supply amount Q so that it may be set to pm.

In the above-mentioned embodiment, the operation is switched to the normal operation when the internal humidity ri drops to the set lower limit value riu due to the all-outside air operation. However, instead of this,
When the inside humidity ri decreases to the set lower limit value riu due to the total outside air operation, the output H of the cooling means (heat exchanger 5 for temperature control) and the supply air amount Q are kept within the outside air state and the inside humidity r
i is maintained at the set lower limit value ri, and the internal temperature ti is
A configuration may be adopted in which the value is adjusted to a value that reaches equilibrium while being maintained at the target temperature tii.

In a partial ventilation circulation state or a full circulation state,
The output H of the cooling means 5 is adjusted so that the in-zone temperature ti becomes the target temperature tii according to the deviation Δti between the in-zone temperature ti (which may be the detected return air temperature) and the target temperature tii, and the supply air amount Q In accordance with the adjustment output H of the cooling means 5 in a predetermined proportional relationship, a lower target device dew point temperature tpm is determined as the absolute humidity xo of the outside air 0A is lower and the temperature to is higher based on the outside air state detection. In addition to the operation in the partial ventilation circulation state or the full circulation state described above, the output H of the cooling means 5 is set so that the in-zone temperature ti becomes the target temperature tii in all outside air states. Of the device dew point tp
Output of the cooling means 5 such that the device dew point temperature tp becomes the target device dew point temperature tpm in the all outside air operation in which the supply air amount Q is adjusted so that the device dew point temperature tpm becomes the target device dew point temperature tpm. And the outside air operation in which the supply air amount Q is adjusted so that the in-zone temperature ti becomes the target temperature tii under the output adjustment.

As a mode of adjusting the output H of the cooling means 5 and the supply air amount Q with respect to the target device dew point temperature tpm, one of the output H of the cooling means 5 and the supply air amount Q is set to the detection area temperature ti. According to the deviation Δti between the target dew point temperature iii and the target dew point temperature ii, and the other is adjusted to the target temperature tii, and the other is adjusted based on the detection information of the device dew point temperature tp. Instead of adjusting the target device dew point temperature tpm to the target device dew point temperature tpm, the device dew point temperature tp can be calculated based on the deviation Δti between the detection range internal temperature ti and the target range internal temperature tii and the detection information of the device dew point temperature tp. The cooling device output H and the air supply amount Q that give a state in which the in-zone temperature ti is maintained at the target temperature tii while the target device dew point temperature tpm is calculated, and the cooling device output H and the air supply amount Q are calculated values thereof. It is also possible to adopt the form of adjusting to.

The target device dew point temperature tpm to be adopted for the outside air condition may be determined according to the design conditions, etc., and the temperature of the contact point at the tangent line s drawn from the outside air condition point oA to the saturation line L. Is not limited to the target device dew point temperature tpm.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 Device configuration diagram

[Fig. 2] Control flowchart

FIG. 3 is a psychrometric chart showing state changes

FIG. 4 is a graph showing the relationship between the temperature and relative humidity of the outside air and the target device dew point temperature.

FIG. 5 is a psychrometric chart for explaining the operation.

FIG. 6 is a psychrometric chart showing an adjustment state in a conventional example.

FIG. 7 is a psychrometric chart showing an adjustment state in another conventional example.

[Explanation of symbols]

 2 Air-conditioning target area 3,6,11 Air supply means 4 Cooling means 13,17 Control means 17a Calculation means H Cooling means output L Saturation line OA Outside air oA Outside air status point p contact Q Supply amount SA Supply air s tangent ti Area temperature tii tii tp dew point temperature tpm target device dew point temperature xo absolute humidity

Claims (2)

[Claims] 1. Air supply means (5), (6), () for cooling outside air (OA) by a cooling means (4) and supplying the cooled air as air supply (SA) to an air conditioning target area (2). 12),
In addition, the control means (13) for adjusting the output (H) and the supply air amount (Q) of the cooling means (4) based on the temperature detection so that the in-zone temperature (ti) becomes the target temperature (tii).
An outside air conditioning system including (17), wherein the control means (13), (17) detects the absolute humidity (xo) of the outside air (OA) based on the temperature and humidity detection of the outside air (OA).
Is lower, and the higher the outside air (OA) temperature (to) is, the lower the target device dew point temperature (tpm) is determined, and the device dew point temperature (tp) is the target device dew point temperature (tpm). Outside air conditioning, which has an adjusting means for adjusting the output (H) and the supply air amount (Q) of the cooling means (4) so that the temperature (ti) in the detection zone becomes the target temperature (tii) apparatus. 2. The temperature of the contact point (p) at the tangent line (s) drawn from the outside air state point (oA) to the saturation line (L) in the air diagram by the computing means (13), (17). The outside air conditioning system according to claim 1, which is provided as a target device dew point temperature (tpm).