JP6632506B2 - air conditioner - Google Patents

Description

  The present invention relates to an air conditioner for latent heat / sensible heat separation in which latent heat treatment and sensible heat treatment are performed separately.

  Conventionally, as an air conditioner for latent heat / sensible heat separation, it has been difficult to treat an indoor latent heat load only with an external controller without using a desiccant rotor or the like in view of the amount of outside air introduced and the dehumidifying ability of the external controller. Therefore, a method of separating the latent heat and the sensible heat by dividing the coil into two in the secondary side air conditioner is disclosed (Patent Document 1). In addition, a method is disclosed in which two coils are arranged in a straight line, dehumidified as much as possible with high-temperature cold water, and a finally required amount of dehumidification is secured with low-temperature cold water (Patent Document 2).

JP 2008-070097 A JP 2015-007484 A

  The technology described in Patent Literature 1 realizes energy saving by reducing the load by changing indoor setting conditions. However, the load under the same condition is the same, and the energy consumption cannot be reduced.

  Although the technology described in Patent Document 2 uses two coils, since the total air volume is processed by two-stage coils arranged linearly, the final air condition at the outlet is one coil. Is the same as that cooled and dehumidified. For this reason, in the case of a low sensible heat load where the outside air is high humidity and the indoor load is small in the rainy season or the like, if the dehumidification is prioritized, the blowing temperature decreases, and the room temperature decreases. Therefore, the comfort is impaired and the sensible heat load of the room is increased, the load is increased, and the overall efficiency is reduced.

  An object of the present invention is to solve the above-mentioned problems and to provide an air conditioner that separates latent heat and sensible heat while ensuring energy saving, and that comfortably maintains indoor temperature and humidity conditions.

The air conditioner according to the present invention
An air conditioner that dehumidifies and cools outside air and indoor return air blown from upstream, and blows air into the room as air supply from downstream,
A casing having a latent heat treatment system and a sensible heat treatment system,
An outside air intake for taking the outside air into the casing,
A return air intake unit for introducing the return air into the casing;
A blower that blows the supply air by mixing the outside air and the return air that has been dehumidified and cooled in the latent heat treatment system and the sensible heat treatment system,
An air supply unit that supplies the air supplied from the casing to the room by the air supply unit,
With
The latent heat treatment system,
A latent heat treatment system high-temperature cold water section capable of cooling and dehumidifying the outside air and the return air,
A latent heat treatment system capable of cooling and dehumidifying the outside air and the return air using chilled water lower than the latent heat treatment system high temperature chilled water unit downstream of the latent heat treatment system high temperature chilled water unit,
Has,
The sensible heat treatment system has a sensible heat treatment system high-temperature chilled water unit capable of cooling and dehumidifying the return air using chilled water higher than the latent heat treatment system low-temperature chilled water unit,
The latent heat treatment system between the high-temperature chilled water section and the latent heat treatment system low-temperature chilled water section of the latent heat treatment system, and the downstream side of the sensible heat treatment system high-temperature chilled water section of the sensible heat treatment system are opened, closed, or adjusted for the amount of passing air. It is characterized by further comprising a possible communication part.

The air conditioner according to the present invention
The latent heat treatment system may further include a bypass portion that opens and closes a passage that bypasses the outside air and the return air with respect to the high-temperature and cold water portion of the latent heat treatment system, or that can adjust an amount of air passing therethrough.

In the air conditioner according to the present invention,
The return air intake section,
A first return air intake unit for introducing the return air into the sensible heat treatment system;
A second return air intake unit for introducing the return air into the latent heat treatment system;
Has,
The first return air intake unit is provided with a first intake amount adjustment unit that adjusts an amount of the return air to be taken into the sensible heat treatment system,
The second return air intake unit is provided with a second intake amount adjustment unit that adjusts an amount of the return air to be introduced into the latent heat treatment system.

In the air conditioner according to the present invention,
At the time of peak load, the first intake amount adjustment unit and the second intake amount adjustment unit adjust the opening or the passing air volume, and the bypass unit and the communication unit are closed.

In the air conditioner according to the present invention,
At the time of high load, the first intake amount adjustment unit and the second intake amount adjustment unit adjust the opening or passing air volume, the bypass unit closes, and the communication unit opens or adjusts the passing air volume. Feature

In the air conditioner according to the present invention,
At the time of low load, the first intake amount adjustment unit and the second intake amount adjustment unit adjust the opening or passing air flow, the bypass unit closes, the communication unit opens or adjusts the passing air flow, The latent heat treatment system is characterized in that circulation of cold water in the low-temperature cold water section is stopped.

In the air conditioner according to the present invention,
At the time of outside air cooling, the first intake amount adjustment unit and the second intake amount adjustment unit adjust the opening or passing airflow, the bypass unit and the communication unit adjust the opening or passing airflow, and the latent heat treatment system The circulation of the cold water in the high-temperature cold water section and the low-temperature cold water section in the latent heat treatment system is stopped.

The air conditioner according to the present invention
The air blower is provided downstream of each of the latent heat treatment system and the sensible heat treatment system.

The air conditioner according to the present invention
The sensible heat treatment system further includes a flow rate adjustment unit downstream of the high-temperature chilled water unit in the sensible heat treatment system.

The air conditioner according to the present invention
High temperature cold water is cascaded from the latent heat treatment system high temperature cold water section to the sensible heat treatment system high temperature cold water section.

  ADVANTAGE OF THE INVENTION According to the air conditioner concerning this invention, it becomes possible to perform the separation process of a latent heat and a sensible heat with energy saving, and to maintain indoor temperature and humidity conditions comfortably.

1 shows an air conditioner according to a first embodiment. The state of the air conditioner of the first embodiment at the peak time is shown. The state of the air conditioner of the first embodiment at the time of high load is shown. The state of the air conditioner of the first embodiment at the time of low load is shown. 2 shows the state of the air conditioner of the first embodiment during outdoor air cooling. Each point of a general air conditioner is shown. The psychrometric chart of a general air conditioner is shown. The points of the air conditioner of the first embodiment are shown. FIG. 2 shows an air line diagram of the air conditioner of the first embodiment. The psychrometric diagram of the air conditioner of the first embodiment when the latent heat load is 100% and the sensible heat load is 52% is shown. The psychrometric chart of a general air conditioner when the latent heat load is 100% and the sensible heat load is 52% is shown. 3 shows an image of cooling and dehumidification of the air conditioner of the present embodiment. 2 shows an air conditioner according to a second embodiment. 9 shows an air conditioner according to a third embodiment. 9 shows an air conditioner according to a fourth embodiment.

  Hereinafter, an embodiment of an air conditioner 1 according to the present invention will be described with reference to the drawings.

  FIG. 1 shows an air conditioner 1 according to the first embodiment.

  The air conditioner 1 of the first embodiment includes a casing 2 having a latent heat treatment system 3 and a sensible heat treatment system 4, an outside air intake 21 for taking outside air OA into the casing 2, and a return for taking return air RA from the room into the casing 2. Air intake section 22, latent heat treatment system high-temperature chilled water coil 11 capable of cooling and dehumidifying air, sensible heat treatment system high-temperature chilled water coil 12 capable of cooling air, and latent heat treatment system low-temperature chilled water coil 13 capable of cooling and dehumidifying air passing therethrough A bypass damper 32 capable of forming a passage for air to bypass the latent heat treatment system high-temperature chilled water coil 11 in the latent heat passage 3; a communication damper 33 capable of communicating the latent heat treatment system 3 with the sensible heat treatment system 4; The air conditioner includes a blower 40 that blows the cooled and dehumidified air into the room, and an air supply unit 23 that supplies air from the casing 2 to the room.

The casing 2 has a latent heat treatment system 3 and a sensible heat treatment system 4 which are separated on the side having the outside air intake 21 and the return air intake 22 and are connected on the side having the air supply 23. The latent heat treatment system 3 includes a latent heat treatment system high-temperature chilled water coil 11 and a latent heat treatment system low-temperature chilled water coil 13. The sensible heat treatment system 4 is provided with a sensible heat treatment system high-temperature chilled water coil 12. The latent heat treatment system 3 and the sensible heat treatment system 4 are finally mixed, and a blower 40 is provided at that position.

  The outside air intake part 21 is a part for taking outside air OA into the latent heat treatment system 3 of the casing 2. The return air intake part 22 is a part that takes the return air RA into the casing 2. The first return air intake part 22a is a part that takes the first return air RA1 into the sensible heat treatment system 4 of the casing 2. The second return air intake part 22b is a part that takes the second return air RA2 into the latent heat treatment system 3 of the casing 2.

  The first return air intake part 22a is provided with a first adjustment bumper 31a for adjusting the amount of the first return air RA1 to be taken into the sensible heat treatment system 4 of the casing 2. The second return air intake part 22b is provided with a second adjustment bumper 31b for adjusting the amount of the second return air RA2 to be taken into the latent heat treatment system 3 of the casing 2.

  The latent heat treatment system high-temperature chilled water coil 11 has a coil through which water or a refrigerant at about 14 ° C. flows, and is provided in the latent heat treatment system 3. The latent heat treatment system high temperature chilled water coil 11 is a heat exchanger that cools and dehumidifies the outside air OA or the second return air RA2 passing through the gap between the coils. When cold water is not supplied to the high-temperature cold water coil 11 of the latent heat treatment system, the passing outside air OA or the second return air RA2 is not cooled and dehumidified.

  The sensible heat treatment system high-temperature chilled water coil 12 has a coil through which water or a refrigerant at about 14 ° C. flows, and is provided in the sensible heat treatment system 4. The sensible heat treatment system hot / cold water coil 12 is a heat exchanger that cools the return air RA passing through the gap between the coils. When chilled water is not supplied to the sensible heat treatment system high temperature chilled water coil 12, the passing outside air OA or the first return air RA1 is not cooled.

  The latent heat treatment system low-temperature chilled water coil 13 has a coil through which water or a refrigerant at about 5 to 7 ° C. flows, and is provided in the latent heat treatment system 3. The latent heat treatment system low-temperature chilled water coil 13 is a heat exchanger that cools and dehumidifies (mainly dehumidifies) the outside air OA or the return air RA that passes through the gap between the coils. When chilled water is not supplied to the latent heat treatment system low-temperature chilled water coil 13, the passing outside air OA or return air RA is not cooled and dehumidified.

  The bypass damper 32 is openable and closable, and forms an outside air or return air passage that bypasses the latent heat treatment system high temperature chilled water coil 11 in the latent heat passage 3 in the open state. The communication damper 33 can be opened and closed, and in the open state, between the latent heat treatment system high-temperature chilled water coil 11 and the latent heat treatment system low-temperature chilled water coil 13 of the latent heat treatment system 3 and the sensible heat treatment system high-temperature chilled water coil 12 of the sensible heat treatment system 4. And a part of the airflow that has passed through the latent heat treatment system high-temperature and cold water coil coil 11 is bypassed to the sensible heat treatment system 4.

  The blower 40 blows the air cooled and dehumidified by each coil into the room. The air supply SA blown by the blower 40 is blown into the room from the air supply section 23 of the casing 2.

  Next, control of each unit of the air conditioner 1 according to the first embodiment will be described.

The present embodiment aims to improve the energy consumption efficiency (COP: Coefficient of Performance) of the air conditioner 1. Energy consumption efficiency improves as the temperature of the cold water rises. Therefore, each part is controlled according to the latent heat load as shown in Table 1 below ("open" includes flow rate adjustment).

  FIG. 2 shows a state of the air conditioner 1 according to the first embodiment at a peak time.

  At the time of peak load, the air conditioner 1 opens the first intake amount adjustment damper 31a of the first return air intake part 22a and the second intake amount adjustment damper 31b of the second return air intake part 22b to maximize the passing air volume. Then, the first return air RA1 is introduced into the sensible heat treatment system 4, and the second return air RA2 is introduced into the latent heat treatment system 3. The bypass damper 32 and the communication damper 33 are closed.

  When the latent heat load in the room is large, the latent heat treatment capacity is insufficient only with the flow rate of the outside air OA. Therefore, the second intake amount adjustment damper 31b of the second return air intake part 22b is used until the total dehumidification amount and the latent heat load match. Is released to adjust the passing air volume, and the return air RA in the room is mixed with the outside air OA. In the latent heat treatment system 3 of the air conditioner 1, the outside air OA and the return air RA are first dehumidified by high-temperature cold water of the latent heat treatment system high-temperature cold water coil 11 as much as possible. Subsequently, the outside air OA and the return air RA are lowered to the final dehumidification amount by the low-temperature chilled water of the latent heat treatment system low-temperature chilled water coil 13. In the sensible heat treatment system 4 of the sensible heat treatment system 4, the amount of cold water flowing is controlled so that a required temperature difference is obtained.

  FIG. 3 shows a state of the air conditioner 1 according to the first embodiment under a high load.

  When the load is high, the air conditioner 1 opens the second intake amount adjustment damper 31b of the second return air intake section 22b to adjust the amount of air passing therethrough, and takes the second return air RA2 into the latent heat treatment system 3. The bypass damper 32 is closed, and the communication damper 33 is opened to adjust the passing airflow to match the latent heat load.

  The air conditioner 1 at the time of high load takes the outside air OA from the outside air intake unit 21 into the latent heat treatment system 3, takes in the room return air RA from the second return air intake unit 22b, and converts the outside air OA and the second return air RA2. Mix. The mixed outside air OA and the second return air RA2 are first cooled and dehumidified by the high-temperature cold water of the latent heat treatment system high-temperature cold water coil 11. The amount of air corresponding to the latent heat load of the cooled and dehumidified outside air OA and the second return air RA2 passes through the latent heat treatment system low-temperature chilled water coil 13. The remaining part of the cooled and dehumidified outside air OA and the second return air RA2 passes through the communication damper 33 and flows to the sensible heat treatment system 4. The outside air OA and the second return air RA2 passing through the latent heat treatment system low-temperature chilled water coil 13 are further cooled and dehumidified.

  The air conditioner 1 under a high load takes the first return air RA1 in the room into the sensible heat treatment system 4 from the first return air intake 22a. The first return air RA1 taken in from the first return air intake part 22a is cooled and dehumidified (mainly cooled) by high-temperature cold water of the sensible heat treatment system high-temperature cold water coil 12. In the sensible heat treatment system high temperature chilled water coil 12, the amount of flowing chilled water is controlled so as to have a required temperature difference. The first return air RA1 that has been cooled and dehumidified (mainly cooled) is mixed with the outside air OA that has passed through the communication damper 33 and the second return air RA2.

  Thereafter, the outside air OA and the second return air RA2 passing through the latent heat treatment system low-temperature chilled water coil 13 in the latent heat treatment system 3 and the first return air RA1 passing through the sensible heat treatment system high-temperature chilled water coil 12 in the sensible heat treatment system 4 are supplied to the blower 40. As a result, air is blown into the room as air supply SA.

  FIG. 4 shows a state of the air conditioner 1 according to the first embodiment when the load is low.

  When the load is low, the air conditioner 1 opens the second intake amount adjustment damper 31b of the second return air intake section 22b, and takes the second return air RA2 into the latent heat treatment system 3. The bypass damper 32 is closed, and the communication damper 33 is open. When the outside air has a sufficiently low humidity, cold water is not circulated through the latent heat treatment system low-temperature chilled water coil 13.

  The air conditioner 1 at a low load takes in the outside air OA from the outside air intake section 21 and the second return air RA2 in the room from the second return air intake section 22b into the latent heat treatment system 3, and the outside air OA and the second return air. Mix RA2. The mixed outside air OA and the second return air RA2 are cooled and dehumidified by the high-temperature cold water of the latent heat treatment system high-temperature cold water coil 11. Part of the cooled and dehumidified outside air OA and the second return air RA2 pass through the latent heat treatment system low-temperature chilled water coil 13. The remaining part of the cooled and dehumidified outside air OA and the second return air RA2 passes through the communication damper 33 and flows to the sensible heat treatment system 4. Since cold water is not flowing through the latent heat treatment system low-temperature chilled water coil 13, the mixed outside air OA and the second return air RA2 are not cooled and dehumidified. It is possible to reduce the static pressure.

  The air conditioner 1 at low load takes the first return air RA1 in the room into the sensible heat treatment system 4 from the first return air intake part 22a. The first return air RA1 taken in from the first return air intake part 22a is cooled and dehumidified by the high-temperature cold water of the sensible heat treatment system high-temperature cold water coil 12. In the sensible heat treatment system high temperature chilled water coil 12, the amount of flowing chilled water is controlled so as to have a required temperature difference. The cooled and dehumidified first return air RA1 is mixed with the outside air OA that has passed through the communication damper 33 and the second return air RA2.

  Thereafter, the outside air OA and the return air RA passing through the latent heat treatment system low-temperature chilled water coil 13 in the latent heat treatment system 3 and the return air RA passing through the sensible heat treatment system high-temperature chilled water coil 12 in the sensible heat treatment system 4 are supplied by the blower 40. It is blown indoors as SA.

  FIG. 5 shows a state of the air conditioner 1 according to the first embodiment at the time of outside air cooling.

  At the time of outside air cooling, the air conditioner 1 opens the second intake amount adjustment damper 31b of the second return air intake section 22b and takes the second return air RA2 into the latent heat treatment system 3. The bypass damper 32 and the communication damper 33 are opened. When the outside air has a sufficiently low humidity, no cold water flows through the latent heat treatment system high-temperature chilled water coil 11 and the latent heat treatment system low-temperature chilled water coil 13.

  The air conditioner 1 at the time of outside air cooling takes in the outside air OA from the outside air intake 21 and the second return air RA2 in the room from the second return air intake 22b to the latent heat treatment system 3, and takes the outside air OA and the second return air. Mix RA2. The mixed outside air OA and the second return air RA2 pass through the latent heat treatment system hot / cold water coil 11 or the bypass damper 32. The outside air OA and a part of the second return air RA2 that have passed through the latent heat treatment system high-temperature chilled water coil 11 or the bypass damper 32 pass through the latent heat treatment system low-temperature chilled water coil 13. The remaining outside air OA and a part of the second return air RA2 pass through the communication damper 33 and flow to the sensible heat treatment system 4. By opening all the passages in the air conditioner, pressure loss can be minimized and the fan static pressure can be reduced.

  Next, the air conditioner 1 of the first embodiment, a general air conditioner 10, and a conventional technology will be compared.

  FIG. 6 shows each point of the general air conditioner 10. FIG. 7 shows an air line diagram of a general air conditioner 10. FIG. 8 shows points of the air conditioner 1 according to the first embodiment. FIG. 9 shows an air line diagram of the air conditioner 1 of the first embodiment. The air conditioners 1 and 10 shown in FIGS. 6 and 8 exchange heat with outside air OA in the heat exchanger 5 and blow air to the case 2. The general air conditioner 10 shown in FIG. 6 cools and dehumidifies only with the latent heat treatment low-temperature chilled water coil 13.

Table 2 shows the temperature, the absolute humidity, and the enthalpy at each point of the air conditioner 1 of the first embodiment. Table 3 shows a comparison of the energy saving rates of the general air conditioner 10, the air conditioner 1 of the first embodiment, and the air conditioner described in Patent Document 2.

As shown in Table 3, when the latent heat treatment is performed with low-temperature cold water as in the air conditioner of Patent Document 2, the energy saving is 7%. On the other hand, when the latent heat treatment system high-temperature chilled water coil 11 and the latent heat treatment system low-temperature chilled water coil 13 are arranged in a cascade like the air conditioner 1 of the first embodiment, the energy saving is 12.9%. This is because the coefficient of performance (COP) of the refrigerator of the high-temperature and cold water is high, and by arranging them in a cascade, the high-temperature and cold water can be used to the maximum.

  Here, if an attempt is made to treat the indoor latent heat load only with the outside air OA, the dehumidification cannot be performed sufficiently at a general cold water temperature (5 to 7 ° C.). Therefore, the air conditioner 1 of the first embodiment can process a latent heat load that cannot be processed by simply dehumidifying the outside air OA by mixing the return air RA with the outside air OA and increasing the total air volume. By arranging the latent heat treatment system high-temperature chilled water coil 11 and the latent heat treatment system low-temperature chilled water coil 13 in a cascade, the high-temperature chilled water can be used to the maximum and the COP can be improved.

  Further, by providing the communication damper 33 between the latent heat treatment system 3 and the sensible heat treatment system 4, the air that has passed through the latent heat treatment system high-temperature / cold water coil 11 can be distributed to the latent heat treatment system 3 and the sensible heat treatment system 4, respectively. it can.

  If the communication damper 33 is not provided, and the latent heat load is small and it is not necessary to mix the return air RA into the latent heat treatment system 3, all the return air including the unreacted return air RA is supplied to the sensible heat treatment system Will be processed. In this case, the coil area of the sensible heat treatment system hot / cold water coil 12 is designed according to the amount of return air RA. Therefore, the coil area of the sensible heat treatment system high temperature chilled water coil 12 becomes large, and the entire air conditioner 1 must be made large, which causes a cost increase.

For example, in the case of a general office building design condition, since the air volume of the return air RA mixed with the air volume of the outside air OA (6 m ³ / h / m ² ) is almost the same, the air volume of the supply air SA (26 m ³ / h / m ² )
The increase rate of the air volume of A ((26-6-6 =) 14m ³ / h / m ² ) is 43% ((14 + 6) /14=1.43). in this case,
The coil area of the sensible heat treatment system hot / cold water coil 12 must be increased by 43%.

On the other hand, by providing the communication damper 33, it is possible to minimize the coil area of the sensible heat treatment system high temperature chilled water coil 12 by bypassing the air that does not need to be dehumidified. As a result, the entire air conditioner 1 can be reduced. Further, when the latent heat load is smaller than the same amount of the outside air OA, the dehumidifying amount can be controlled by bypassing the air that does not need to be dehumidified, and the efficiency of the entire refrigerator can be increased by reducing the low-temperature chilled water load. In addition, by reducing the amount of air passing through the latent heat treatment system low-temperature chilled water coil 13, the coil dehumidifying ability can be improved.

  Furthermore, the air conditioner 1 of the first embodiment cools and dehumidifies a part of the mixture of the outside air OA and the second return air RA2, and performs the sensible heat treatment on the remaining first return air RA1. Therefore, the air conditioner 1 of the first embodiment has a lower possibility of the room being supercooled at the time of low sensible heat load dehumidification than the conventional air conditioner, and has a dehumidifying ability at the time of outside air humid low sensible heat load such as during the rainy season. Is excellent.

  In a conventional air conditioner, when the sensible heat load decreases, the coil outlet humidity increases, and the coil surface does not reach the dew point temperature, so that dehumidification is not effective and the room humidity increases. Therefore, in order to dehumidify, it is necessary to lower the set temperature so that the supply air temperature (coil outlet temperature) becomes equal to or lower than the dew point of the air at the air conditioner inlet.

FIG. 10 shows an air line diagram of the air conditioner 1 of the first embodiment when the latent heat load is 100% and the sensible heat load is 52%. FIG. 11 shows a psychrometric diagram of a general air conditioner 10 when the latent heat load is 100% and the sensible heat load is 52%.

For example, Table 4 below shows the air conditioner 1 of the first embodiment in the case of a latent heat load of 100% and a sensible heat load of 52%.
Temperature, absolute humidity, and enthalpy at each point in FIG. Table 5 shows the temperature, the absolute humidity, the relative humidity, and the enthalpy at each point of the general air conditioner 10 when the room temperature is 26 ° C. with the latent heat load of 100% and the sensible heat load of 52%. Table 6 shows 100% latent heat load and 52% sensible heat load.
Shows the temperature, the absolute humidity, the relative humidity, and the enthalpy at each point of the general air conditioner 10 when the indoor humidity is 10.5 g / kg.

In general air conditioners, as shown in Table 5, when the room temperature is adjusted to the set value, the relative humidity is 69.7% in the case of a fixed air flow, which clears the upper limit of 70% of the building environmental hygiene management standard, but it is not comfortable. I can't say. Also, as shown in Table 6, when the absolute humidity is adjusted to the set value with a general air conditioner, the room temperature is 20.96 ° C and the relative humidity is 67.8%, which also meets the building environmental hygiene management standards. , A room temperature of 26 ° C and a relative humidity of 50%. On the other hand, as shown in Table 4, the air conditioner 1 of the first embodiment can achieve a room temperature of 26 ° C. and a relative humidity of 50%. That is, by adjusting the air volume of the latent heat treatment system low-temperature chilled water coil 13, the controllability of the indoor environment can be improved.

  FIG. 12 shows an image of cooling and dehumidification of the air conditioner 1 of the present embodiment.

  The air conditioner 1 of the present embodiment lowers the mixture of the outside air OA and the return air RA to a temperature that can be lowered by the latent heat treatment system high-temperature chilled water coil 11, so that the dehumidification amount matches the latent heat load. By adjusting the amount of air passing through the coil while performing cooling and dehumidification at the lowest temperature, the amount of low-temperature chilled water is smaller than controlling the overall dehumidification amount by raising the coil outlet temperature at a constant air volume as in a general air conditioner. can do. This is because, due to the nature of air, dehumidification does not start until the dew point is reached. Thereby, dehumidification can be performed with the least amount of low-temperature cold water. That is, high-temperature cold water can be used most, and the high efficiency of the latent heat treatment system high-temperature cold water coil 11 can be used to the maximum, thereby improving system efficiency.

  As shown in FIG. 12, when dehumidifying to a humidity difference (2) that is twice as large as the humidity difference (1), the required energy difference (2) of the low-temperature cold water required after cooling with the high-temperature cold water is the humidity. Energy is reduced to less than twice the energy difference (1) for dehumidifying up to the difference (1), and accordingly, low-temperature cold water does not need to be used, and more efficient high-temperature cold water can be used, thereby saving energy.

  In addition, the air conditioner 1 of the present embodiment can perform damper switching according to the state of the outside air OA and the indoor load, reduce the coil pressure loss, and reduce the power of the blower 40. Further, in the case of the outside air cooling, by opening the communication damper 33 fully, outside air of a design outside air amount or more can be introduced, and further energy saving can be achieved.

  FIG. 13 shows an air conditioner 1 according to the second embodiment.

  In the air conditioner 1 of the second embodiment, a first blower 40a is provided in the latent heat treatment system 3, and a second blower 40b is provided in the sensible heat treatment system 4. By providing the blower 40 in each of the latent heat treatment system 3 and the sensible heat treatment system 4 as described above, each of the blowers 40a and 40b bears its own pressure loss, so that the large pressure loss in the latent heat treatment system 3 is compensated. As a result, fan power is saved.

  FIG. 14 shows an air conditioner 1 according to the third embodiment.

  The air conditioner 1 of the third embodiment does not include the second return air intake part 22b and the bypass damper 32, and provides the flow rate adjustment damper 34 downstream of the sensible heat treatment system high-temperature and cold water coil 12 of the sensible heat treatment system 4. The flow control damper 34 reduces the amount of return air sent from the sensible heat treatment system high-temperature chilled water coil 12 to the blower 40, and allows a part of the return air to pass from the sensible heat treatment system 4 to the latent heat treatment system 3 through the communication damper 33. . Then, the return air passed to the latent heat treatment system 3 is mixed with the outside air OA, passes through the latent heat treatment system low-temperature chilled water coil 13, and is cooled and dehumidified. Note that the first intake amount adjustment damper 31b and the bypass damper 32 of the second return air intake section 22b may be provided and closed.

  Since the system of the outside air OA and the return air RA can be separated, the blowing humidity is high and if only the outside air OA is enough for dehumidification, only the outside air OA is cooled and dehumidified by the latent heat treatment system high-temperature chilled water coil 11 and further required. Dehumidification can be performed up to a dehumidification load. For this reason, unlike the first embodiment, since part of the return air RA is not cooled more than necessary, more energy is saved. Also, since the connection of the return air duct can be made at one place, the space efficiency around the equipment can be improved and the cost of the duct material can be reduced.

  FIG. 15 shows an air conditioner 1 according to the fourth embodiment.

  The air conditioner 1 of the fourth embodiment is an example in which high-temperature chilled water is cascaded from a latent heat treatment system high-temperature chilled water coil 11 to a sensible heat treatment system high-temperature chilled water coil 12. By cascading high-temperature cold water from the latent heat treatment system high-temperature chilled water coil 11 to the sensible heat treatment system high-temperature chilled water coil 12, the latent heat treatment system high-temperature chilled water coil 11 can use chilled water with a low temperature difference. The dehumidifying ability can be increased more than the difference.

  As described above, the air conditioner 1 of the present embodiment is the air conditioner 1 that dehumidifies and cools the outside air OA and the return air RA in the room that are blown from the upstream, and blows the room as the air supply SA from the downstream. And a casing 2 having a sensible heat treatment system 4, an outside air intake 21 for taking outside air OA into the casing 2, a return air intake 22 for taking return air RA into the casing 2, and dehumidification by the latent heat treatment system 3 and the sensible heat treatment system 4. An air supply unit 40 that mixes the cooled outside air OA and the return air RA to blow the air supply SA, and an air supply unit 23 that supplies the air supply SA blown from the casing 2 by the air blowing unit 40 to the room. The latent heat treatment system 3 includes a latent heat treatment system high-temperature chilled water unit 11 capable of cooling and dehumidifying the outside air OA and the return air RA, and cold water lower than the latent heat treatment system high-temperature chilled water unit 11 downstream of the latent heat treatment system high-temperature chilled water unit 11. use A latent heat treatment system low-temperature chilled water section 13 capable of cooling and dehumidifying the outside air OA and the return air RA, and the sensible heat treatment system 4 cools the return air using chilled water higher in temperature than the latent heat treatment system low-temperature chilled water section 13 It has a sensible heat treatment system hot / cold water section 12 capable of dehumidifying, between the latent heat treatment system high temperature chilled water section 11 and the latent heat treatment system low temperature chilled water section 13 of the latent heat treatment system 3, and between the sensible heat treatment system high temperature chilled water section 12 of the sensible heat treatment system 4. And a communication portion 33 that can be opened or closed or can adjust the amount of air passing therethrough.

  Therefore, the air conditioner 1 performs efficient separation of latent heat and sensible heat, thereby enabling efficient use of high-temperature chilled water, increasing the efficiency of the refrigerator, saving energy, and comfortably maintaining indoor temperature and humidity conditions. It is possible to do. In addition, the air conditioner 1 can process the latent heat load that cannot be processed only by dehumidifying the outside air OA by mixing the return air RA with the outside air OA and increasing the total air volume. By arranging the latent heat treatment system high-temperature chilled water coil 11 and the latent heat treatment system low-temperature chilled water coil 13 in a cascade, the high-temperature chilled water can be used to the maximum and the COP can be improved. Further, by providing the communication damper 33 between the latent heat treatment system 3 and the sensible heat treatment system 4, the wind speed passing through the latent heat treatment system low-temperature chilled water section 13 is reduced, and the dehumidification performance is improved. Further, it is possible to minimize the coil area of the sensible heat treatment system high temperature cold water coil 12. As a result, the entire air conditioner 1 can be made smaller.

  The air conditioner 1 of the present embodiment includes a bypass portion 32 that can open or close a passage that bypasses the outside air OA and the return air RA with respect to the latent heat treatment system high-temperature chilled water portion 11 or adjust the amount of air passing therethrough. Therefore, the air conditioner 1 can reduce the fan power at the time of cooling the outside air or the like, and can save more energy.

  In the air conditioner 1 of the present embodiment, the return air intake unit 22 includes a first return air intake unit 22a for introducing the return air RA to the sensible heat treatment system 4 and a second return air intake for introducing the return air RA to the latent heat treatment system 3. An inlet 22b, and the first return air intake 22a is provided with a first intake amount adjuster 31a for adjusting the amount of return air RA to be taken into the sensible heat treatment system 4, and a second return air intake is provided. The second intake amount adjustment unit 31b that adjusts the amount of the return air RA to be taken into the latent heat treatment system 3 is provided at 22b. Therefore, the coil area of the sensible heat treatment system high-temperature and cold water coil 12 can be minimized, and the cost can be reduced.

In the air conditioner 1 of the present embodiment, at the time of peak load, the first intake amount adjustment unit 22a and the second intake amount adjustment unit 22b are opened to adjust the passing air volume, and the bypass unit 32 and the communication unit 33 are closed. . Therefore, the air required for dehumidification consists of the latent heat treatment system high-temperature chilled water section 11 and the latent heat treatment system low-temperature chilled water section 1.
3 in order, the latent heat treatment system high temperature chilled water section 11 using high temperature cold water can be used to the maximum, and the sensible heat can be treated by the high temperature cold water of the sensible heat treatment system high temperature chilled water coil 12. In addition, it is possible to minimize the treatment with low-temperature cold water.

  In the air conditioner 1 of the present embodiment, when the load is high, the first intake amount adjustment unit and the second intake amount adjustment unit are opened to adjust the passing air flow, the bypass unit is closed, and the communication unit is opened. Adjust the passing air volume. The air volume of the first return air RA1 can be adjusted to the maximum load. Therefore, unnecessary external air OA and return air RA can be prevented from passing through the latent heat treatment system low-temperature chilled water coil 13 by the communication portion 33 when the temperature is adjusted to the latent heat load. The sensible heat is adjusted by the sensible heat treatment system high-temperature cold water coil 12. Therefore, latent heat and sensible heat can be controlled separately, and more comfortable air conditioning can be achieved. In addition, highly efficient high-temperature cold water can be used to the maximum and energy can be saved. Further, the communication section 33 reduces the amount of air flowing through the latent heat treatment system low-temperature chilled water coil 13 and reduces resistance, so that fan power is reduced and energy can be saved.

  In the air conditioner 1 of the present embodiment, when the load is low, the first intake amount adjustment unit and the second intake amount adjustment unit are opened to adjust the passing air volume, the bypass unit is closed, and the communication unit is opened. Adjust the passing air volume and stop the circulation of cold water in the low-temperature cold water section of the latent heat treatment system. The air volume of the first return air RA1 can be adjusted to the maximum load. The sensible heat is adjusted by the sensible heat treatment system high-temperature cold water coil 12. Therefore, latent heat and sensible heat can be controlled separately, and more comfortable air conditioning can be achieved. In addition, highly efficient high-temperature cold water can be used to the maximum and energy can be saved. Further, the resistance passing through the low-temperature chilled water coil 13 and the communicating portion 33 of the latent heat treatment system becomes the same, the pressure loss is minimized, the fan power is reduced, and energy can be saved.

  In the air conditioner 1 of the present embodiment, at the time of outside air cooling, the first intake amount adjustment unit and the second intake amount adjustment unit are opened to adjust the passing air volume, and the bypass unit and the communication unit are opened to reduce the passing air volume. Adjust and stop the circulation of cold water in the high-temperature cold water section of the latent heat treatment system and the low-temperature cold water section of the latent heat treatment system. Therefore, the pressure loss of the air conditioner 1 is minimized, the fan power is reduced, and energy can be saved.

  The air conditioner 1 of the present embodiment includes blowers 40a and 40b downstream of the latent heat treatment system 3 and the sensible heat treatment system 4, respectively. Therefore, since each of the blowers 40a and 40b bears the corresponding pressure loss, only the blower 40a bears the large pressure loss of the latent heat treatment system 3, resulting in energy saving as a whole.

  The air conditioner 1 of the present embodiment includes a flow rate adjustment unit downstream of the sensible heat treatment system high-temperature and cold water unit of the sensible heat treatment system. Therefore, since the system of the outside air OA and the return air RA can be separated, the blow-out humidity is high, and if the dehumidification is sufficient by the processing of only the outside air OA, only the outside air OA is cooled and dehumidified by the latent heat treatment system high-temperature cold water coil 11 to the last, Further, it can be dehumidified to a required dehumidification load. For this reason, unlike the first embodiment, since part of the return air RA is not cooled more than necessary, more energy is saved. Also, since the connection of the return air duct can be made at one place, the space efficiency around the equipment can be improved and the cost of the duct material can be reduced.

  The air conditioner 1 of the present embodiment cascade uses hot and cold water from a latent heat treatment system hot and cold water section to a sensible heat treatment system hot and cold water section. Therefore, since the latent heat treatment system high-temperature chilled water coil 11 can use the chilled water with a low temperature difference, the dehumidifying ability can be enhanced as compared with the temperature difference of the general design.

  The present invention is not limited by the embodiment. That is, in describing the embodiments, a lot of specific details are included for illustrative purposes, but those skilled in the art may add various variations and changes to these details.

  For example, the first intake amount adjustment damper 31a and the second intake amount adjustment damper 31b may be manually operated, and dehumidification is possible without the bypass damper 32. In addition, the temperature of the high-temperature chilled water can be set to 16 ° C. in combination with floor blowing air conditioning.

DESCRIPTION OF SYMBOLS 1 ... Air conditioner 2 ... Casing 3 ... Latent heat treatment system 4 ... Sensible heat treatment system 11 ... Latent heat treatment system High-temperature chilled water coil (latent heat treatment system high-temperature chilled water part)
12: Sensible heat treatment system high-temperature chilled water coil (sensible heat treatment system high-temperature chilled water part)
13: Latent heat treatment system low-temperature chilled water coil (latent heat treatment system low-temperature chilled water part)
21 ... outside air intake section 22 ... return air intake section 22a ... first return air intake section 22b ... second return air intake section 23 ... air supply section 31a ... first intake amount adjustment damper (first intake amount adjustment section)
31b: second intake amount adjustment damper (second intake amount adjustment unit)
32 ... Bypass damper (bypass section)
33… Communication damper (communication part)
34 ... Flow adjustment damper (flow adjustment unit)
40 ... Blower (Blower)

Claims (10)

An air conditioner that dehumidifies and cools outside air and indoor return air blown from upstream, and blows air into the room as air supply from downstream,
A casing having a latent heat treatment system and a sensible heat treatment system,
An outside air intake for taking the outside air into the casing,
A return air intake unit for introducing the return air into the casing;
A blower that blows the supply air by mixing the outside air and the return air that has been dehumidified and cooled in the latent heat treatment system and the sensible heat treatment system,
An air supply unit that supplies the air supplied from the casing to the room by the air supply unit,
With
The latent heat treatment system,
A latent heat treatment system high-temperature cold water section capable of cooling and dehumidifying the outside air and the return air,
A latent heat treatment system capable of cooling and dehumidifying the outside air and the return air using chilled water lower than the latent heat treatment system high temperature chilled water unit downstream of the latent heat treatment system high temperature chilled water unit,
Has,
The sensible heat treatment system has a sensible heat treatment system high-temperature chilled water unit capable of cooling and dehumidifying the return air using chilled water higher than the latent heat treatment system low-temperature chilled water unit,
The latent heat treatment system between the high-temperature chilled water section and the latent heat treatment system low-temperature chilled water section of the latent heat treatment system, and the downstream side of the sensible heat treatment system high-temperature chilled water section of the sensible heat treatment system are opened, closed, or adjusted for the amount of passing air. An air conditioner further comprising a possible communication part. 2. The air conditioner according to claim 1, further comprising a bypass unit that opens, closes, or adjusts an amount of air passing through the passage that bypasses the outside air and the return air with respect to the latent heat treatment system high-temperature and cold water unit. 3. The return air intake section,
A first return air intake unit for introducing the return air into the sensible heat treatment system;
A second return air intake unit for introducing the return air into the latent heat treatment system;
Has,
The first return air intake unit is provided with a first intake amount adjustment unit that adjusts an amount of the return air to be taken into the sensible heat treatment system,
3. The air conditioner according to claim 1, wherein the second return air intake unit is provided with a second intake amount adjustment unit that adjusts an amount of the return air to be introduced into the latent heat treatment system. 4. 4. The peak intake load adjuster and the second intake adjuster adjust the opening or the passing airflow during a peak load, and the bypass unit and the communication unit are closed. 5. Air conditioner. At the time of high load, the first intake amount adjustment unit and the second intake amount adjustment unit adjust the opening or passing air volume, the bypass unit closes, and the communication unit opens or adjusts the passing air volume. The air conditioner according to claim 3 or 4, wherein: At the time of low load, the first intake amount adjustment unit and the second intake amount adjustment unit adjust the opening or passing air flow, the bypass unit closes, the communication unit opens or adjusts the passing air flow, The air conditioner according to any one of claims 3 to 5, wherein the circulation of the cold water in the low-temperature cold water section of the latent heat treatment system is stopped. At the time of outside air cooling, the first intake amount adjustment unit and the second intake amount adjustment unit adjust the opening or passing airflow, the bypass unit and the communication unit adjust the opening or passing airflow, and the latent heat treatment system The air conditioner according to any one of claims 3 to 6, wherein circulation of the cold water in the high-temperature cold water section and the low-temperature cold water section in the latent heat treatment system is stopped. The air conditioner according to any one of claims 1 to 7, wherein the air blower is provided downstream of each of the latent heat treatment system and the sensible heat treatment system. The air conditioner according to any one of claims 1 to 8, further comprising a flow rate adjustment unit downstream of the high-temperature chilled water unit of the sensible heat treatment system in the sensible heat treatment system. The air conditioner according to any one of claims 1 to 9, wherein high-temperature cold water is cascaded from the high-temperature cold water section of the latent heat treatment system to the high-temperature cold water section of the sensible heat treatment system.

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