Air conditioning ventilation system

Abstract

To provide an air conditioning ventilation system capable of improving temperature and humidity environment in an indoor space.SOLUTION: An air conditioning ventilation system (1) includes an outside air intake port (21), an air supply fan (31) which supplies outside air taken from the ambient air intake port, a direct expansion coil (32) which cools and dehumidifies outside air sent in from the air supply fan, an air intake port (22) which takes in air of a habitable room space (12), a sensible heat exchanger (34) which exchanges sensible heat of air in a habitable room space which is taken from the air take port and sensible heat of air cooled and dehumidified by the direct expansion coil, an exhausting fan (35) which exhausts air exchanged by the sensible heat exchanger to an under-roof space (13) and blowoff ports (23, 24) which supply air exchanged by the sensible heat exchanger to the habitable room space.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an air conditioning and ventilation system. [Background technology]

[0002] For example, in nursing homes and hotels, bathrooms and toilets with ventilation fans are installed in each room. This makes it easy for the negative pressure in the entire building to increase, and outside air tends to flow into the indoor space or the attic space. This can cause the indoor space and the attic space to become humid, especially during the rainy season when the outside air is humid, and summer-type condensation can occur.

[0003] Measures to combat this type of summer condensation include, for example, outdoor air-processing air conditioners that dehumidify moist air and supply it to the indoor space, outdoor air-conditioning units with a reheat dehumidification function, and total heat exchangers with direct expansion coils.

[0004] Furthermore, as a document disclosing a countermeasure against such summer-type condensation, there is JP 2008-070097 A (Patent Document 1). Patent Document 1 discloses that cooled and dehumidified outside air is mixed with the air in the indoor space at a fixed ratio to supply air to the indoor space while preventing a drop in the indoor temperature. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2008-070097 A Summary of the Invention [Problem to be solved by the invention]

[0006] The above-mentioned outdoor air treatment air conditioners and total heat exchangers with direct expansion coils do not have a reheating function, so if the set temperature is lowered to prioritize dehumidification, the room temperature will drop too much. Also, outdoor air conditioners with a reheat dehumidification function can improve the temperature and humidity environment, but since the equipment is large, the initial cost is high and it is difficult to introduce them in small facilities.

[0007] Furthermore, the dehumidifying air conditioner of Patent Document 1 is unable to improve the high humidity environment in the attic space, and the humidity of the supply air may increase due to mixing with the air in the indoor space.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an air conditioning and ventilation system that can improve the temperature and humidity environment in an indoor space. [Means for solving the problem]

[0009] An air conditioning and ventilation system according to one embodiment of the present invention comprises an outside air intake for taking in outside air, an intake fan for supplying the outside air taken in through the outside air intake, a direct expansion coil for cooling and dehumidifying the outside air sent in by the intake fan, an air intake for taking in air from a living space, a sensible heat exchanger for exchanging sensible heat of the air taken in from the living space through the air intake with sensible heat of the air cooled and dehumidified by the direct expansion coil, an exhaust fan for exhausting the air exchanged by the sensible heat exchanger into the attic space, and an outlet for supplying the air exchanged by the sensible heat exchanger to the living space.

[0010] Preferably, the air conditioner further includes a relative humidity sensor for measuring the relative humidity in the living space, a temperature sensor for measuring the temperature in the living space, and a control means for controlling the operation of at least one of the direct expansion coil and the exhaust fan in accordance with the relative humidity measured by the relative humidity sensor and the temperature measured by the temperature sensor.

[0011] Preferably, the living space is further provided with an air conditioner capable of selecting between a cooling mode and a heating mode.

[0012] Preferably, when the air conditioner is in a cooling mode, the control means cools the direct expansion coil and operates the exhaust fan when the relative humidity measured by the relative humidity sensor is higher than a predetermined humidity.

[0013] Preferably, when the air conditioner is in cooling mode, the control means cools the direct expansion coil and stops the exhaust fan when the relative humidity measured by the relative humidity sensor is less than a predetermined humidity and the indoor temperature measured by the temperature sensor is higher than the set temperature of the living space.

[0014] Preferably, when the air conditioner is in a heating mode, the control means heats the direct expansion coil and stops the exhaust fan when the room temperature measured by the temperature sensor is higher than a set temperature for the room space. Effect of the Invention

[0015] According to the air conditioning and ventilation system of the present invention, the temperature and humidity environment in the indoor space can be improved. [Brief description of the drawings]

[0016] [Figure 1] 1 is a schematic diagram showing a building in which an air conditioning ventilation system according to an embodiment of the present invention is used. [Diagram 2] 1 is an enlarged view showing a portion of an air conditioning ventilation system according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a flow diagram of the air conditioning ventilation system according to the embodiment of the present invention in a cooling season. [Figure 4] FIG. 4 is a flow diagram of the air conditioning and ventilation system according to the embodiment of the present invention in a heating season. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and their description will not be repeated.

[0018] <Building Overview> Prior to describing the air conditioning and ventilation system 3 according to this embodiment, we will describe a building 1 that uses the air conditioning and ventilation system 3. Fig. 1 is a schematic diagram showing a building 1 in which the air conditioning and ventilation system 3 according to this embodiment is used.

[0019] Referring to FIG. 1, a building 1 to which the air conditioning ventilation system 3 is applied is a large facility such as a hotel, a nursing home, or a hospital that has multiple rooms, and in particular, a building in which equipment for installing ventilation fans for toilets, bathrooms, unit baths, etc. is installed in each room. An outdoor space 10 and an indoor space 11 are partitioned by an exterior wall portion 14 and a roof portion 17. The indoor space 11 is provided with a living space 12 where people stay, and a ceiling space 13 located above the ceiling of the living space 12. The living space 12 in this embodiment is a space that includes all spaces located below the ceiling space 13, and is a concept that includes not only a space where people stay all the time, but also a non-living room that is a space where people stay temporarily.

[0020] The living space 12 is a space partitioned by an exterior wall portion 14, a ceiling portion 15, and a floor portion 16. An air conditioner 18 that conditions the air in the living space 12 is installed on the exterior wall portion 14 of the living space 12. The air conditioner 18 has functions such as cooling, heating, and ventilation. An air intake 22 and air outlets 23 and 24 of an air conditioning and ventilation system, which will be described later, are provided on the ceiling portion 15.

[0021] The attic space 13 is a space partitioned by an exterior wall portion 14, a ceiling portion 15, and a roof portion 17, and is located above the living space 12. A unit 30 of an air conditioning and ventilation system 3, which will be described later, is disposed in the attic space 13. The air conditioning and ventilation system 3 installed in the attic space 13 will be described in detail below.

[0022] (About the air conditioning and ventilation system) Fig. 2 is an enlarged view of a portion of the air conditioning ventilation system 3 according to the present embodiment. With further reference to Fig. 2, the air conditioning ventilation system 3 will be described in detail. With reference to Figs. 1 and 2, the air conditioning ventilation system 3 of the present embodiment includes an outside air intake 21, an air intake 22, air outlets 23 and 24, and an air conditioning ventilation unit 30.

[0023] The outdoor air intake 21 is an OA that takes in outside air, which is the air in the outdoor space 10. The outdoor air intake 21 is provided in the outer wall portion 14 of the attic space 13, but may also be provided in the roof portion 17, and the installation location is not limited. The outdoor air intake 21 and the air conditioning ventilation unit 30 are connected via a first duct 21a.

[0024] Air intake 22 is an RA that takes in air for habitable space 12. As described above, air intake 22 is provided in ceiling portion 15. As described above, air conditioner 18 is provided in habitable space 12. Therefore, the air in habitable space 12 is air conditioned by air conditioner 18, and the air taken in from air intake 22 is also conditioned air. Air intake 22 and air conditioning ventilation unit 30 are connected via second duct 22a.

[0025] In addition, a relative humidity sensor 61 for measuring the relative humidity of the living space 12 and a temperature sensor 62 for measuring the temperature of the living space 12 are provided in the living space 12. In Fig. 1, the sensors 61, 62 are illustrated as being provided in the same location, but they may be installed in any location in the living space 12 or inside the air intake 22, etc.

[0026] The air outlets 23, 24 are SA that supply air that has undergone sensible heat exchange in a sensible heat exchanger 34 (described later) to the living space 12. The air outlets 23, 24 and the air conditioning ventilation unit 30 are connected via a third duct 23a. The third duct 23a is provided branching out according to the number of the air outlets 23, 24.

[0027] The air conditioning ventilation unit 30 is provided in the attic space 13. The air conditioning ventilation unit 30 is box-shaped, and includes an intake fan 31, a direct expansion coil 32, a sensible heat exchanger 34, and an exhaust fan 35. As shown in Fig. 2, the air conditioning ventilation unit 30 is internally divided into five regions (first to fifth regions 41 to 45).

[0028] The intake fan 31 supplies outside air taken in through the outside air intake 21. The intake fan 31 forcibly sends the outside air towards the direct expansion coil 32. The intake fan 31 is disposed in the first area 41. The first area 41 is provided with an opening connected to the first duct 21a which is connected to the outside air intake 21. In this embodiment, the intake fan 31 is preferably always operating.

[0029] The direct expansion coil 32 cools and dehumidifies the outside air sent from the intake fan 31. The direct expansion coil 32 is a heat exchanger, and is connected to the outdoor unit 33 by a refrigerant pipe, and in particular cools and dehumidifies the outside air. The direct expansion coil 32 is provided between a first region 41 and a second region 42. The second region 42 is a region that contacts the sensible heat exchanger 34. It is preferable that the direct expansion coil 32 is turned ON or OFF under certain conditions by a control means.

[0030] Sensible heat exchanger 34 exchanges the sensible heat of the air taken in from air intake 22 in living space 12 with the sensible heat of the air cooled and dehumidified by direct expansion coil 32. Sensible heat exchanger 34 is a system that exchanges only "heat" when exchanging heat in a heat exchange system, and does not exchange humidity.

[0031] Sensible heat exchanger 34 is disposed at a location where "a flow path through which outside air is supplied to living space 12" and "a flow path through which air in living space 12 is discharged to attic space 13" intersect. Specifically, sensible heat exchanger 34 is located between second to fifth regions 42 to 45. Third region 43 has an opening connected to third duct 23a which is connected to air outlets 23, 24. As a result, "a flow path through which outside air is supplied to living space 12" passes through outside air intake 21, first duct 21a, supply fan 31 in first region 41, direct expansion coil 32, second region 42, sensible heat exchanger 34, third region 43, and third duct 23a.

[0032] Exhaust fan 35 exhausts the air exchanged by sensible heat exchanger 34 to attic space 13. Exhaust fan 35 is provided in fifth area 45. An opening connected to attic space 13 is provided in fifth area 45, and air from exhaust fan 35 is directly exhausted to attic space 13. By providing exhaust fan 35, the "flow path through which air from living space 12 is exhausted to attic space 13" passes through air intake 22, second duct 22a, fourth area 44, sensible heat exchanger 34, and fifth area 45. Fourth area 44 has an opening connected to second duct 22a connected to air intake 22. Control means selects ON / OFF of exhaust fan 35 under certain conditions.

[0033] As described above, the operation of the direct expansion coil 32 and the exhaust fan 35 is controlled by a control means (not shown). The control means may be capable of controlling not only ON / OFF but also strength. A specific control method will be described later. The control means may be capable of controlling the operation of at least one of the direct expansion coil 32 and the exhaust fan 35.

[0034] Next, the air flow will be described with reference to the figure. For ease of understanding, specific values ​​of temperature, absolute humidity, and relative humidity will be given, but it should be noted that these are merely examples.

[0035] In summer, the temperature of the outside air at point B in the outdoor space 10 is 28°C, the relative temperature is 90%, and the absolute humidity is 21.6 g / kg (DA). In this case, when the air conditioning ventilation unit 30 is operated, the outside air is cooled and dehumidified by the direct expansion coil 32, so that the temperature at point C in the second region 42 (between the direct expansion coil 32 and the sensible heat exchanger 34) becomes 10°C, the relative temperature is 90%, and the absolute humidity is 6.9 g / kg (DA). On the other hand, when the air conditioner 18 is operated in cooling mode in the living space 12, the temperature at point A in the living space 12 becomes 26°C, the relative humidity is 50%, and the absolute humidity is 10.5 g / kg (DA).

[0036] In the sensible heat exchanger 34, the sensible heat of the second region 42 (between the direct expansion coil 32 and the sensible heat exchanger 34) is exchanged with the sensible heat of the living space 12. As a result, the temperature of the air at point D blown out into the attic space 13 is 18°C, the relative temperature is 81%, and the absolute humidity is 10.5 g / kg (DA). Compared to the temperature and humidity at points A and B, both the temperature and humidity are lower, and the temperature and humidity environment of the attic space 13 can be improved compared to the case where the outside air and the air of the living space 12 are directly introduced into the attic space 13. Furthermore, the temperature of the air at point E blown out from the air outlets 23 and 24 into the living space 12 is 18°C, the relative temperature is 54%, and the absolute humidity is 6.9 g / kg (DA). Compared to point C, the temperature is higher, but the absolute humidity remains the same, so that it is possible to prevent the temperature of the living space 12 from dropping too much.

[0037] Fig. 3 is a flow diagram of the air conditioning ventilation system in the cooling season. The operation of the air conditioning system in the cooling unit will be described with reference to Fig. 3. In the cooling unit, the air conditioner 18 operates in the cooling mode.

[0038] The relative humidity of the living space 12 is measured by the relative humidity sensor 61 for measuring the relative humidity of the living space 12, and it is confirmed whether the relative humidity (relative humidity) of the living space 12 is greater than 70% (step S20). If the relative humidity (indoor relative humidity) of the living space 12 is greater than 70% (No in step S20), the control means cools the direct expansion coil 32 and operates the exhaust fan 35. If the relative humidity of the living space 12 is greater than 70%, this is because the humidity is high and it is desired to dehumidify the attic space 13 as well. Note that, although the predetermined value of the relative humidity of the living space 12 has been described as 70%, this value can vary depending on various conditions.

[0039] If the relative humidity (indoor relative humidity) of the living space 12 is lower than 70% (Yes in step S20), it is confirmed whether the indoor temperature measured by the temperature sensor 62 for measuring the temperature of the living space 12 is lower than the set temperature of the air conditioner 18 (step S22). If the indoor temperature is higher than the set temperature of the air conditioner 18 (No in step S22), the control means cools the direct expansion coil 32 and stops the exhaust fan 35.

[0040] If the room temperature is lower than the set temperature of the air conditioner 18 (Yes in step S22), both the direct expansion coil 32 and the exhaust fan 35 are stopped. That is, only the sensible heat exchanger 34 is cooled as usual.

[0041] Fig. 4 is a flow diagram of the air conditioning and ventilation system in the heating season. The operation of the air conditioning system in the heating season will be described with reference to Fig. 4. In the heating season, the air conditioner 18 operates in the heating mode.

[0042] It is confirmed whether the indoor temperature measured by the temperature sensor 62 for measuring the temperature of the living space 12 is lower than the set temperature of the air conditioner 18 (step S30). If the indoor temperature is higher than the set temperature of the air conditioner 18 (No in step S30), the control means stops both the direct expansion coil 32 and the exhaust fan 35.

[0043] If the indoor temperature is lower than the set temperature of the air conditioner 18 (Yes in step S30), the control means cools the direct expansion coil 32 and stops the exhaust fan 35. That is, only the sensible heat exchanger 34 is operated as usual. As a result, during the heating season, the exhaust fan 35 is stopped to prevent the air from the living space 12 from being exhausted into the attic space 13, thereby saving energy.

[0044] Conventionally known total heat exchangers with direct expansion coils perform total heat exchange between outdoor air and indoor air, then cool and dehumidify using the direct expansion coil, which is highly energy-efficient, but the temperature of the air supplied to the living space is too low. In addition, the air that has undergone total heat exchange is exhausted outdoors.

[0045] In the air conditioning and ventilation system of this embodiment, after cooling and dehumidifying the outside air with a direct expansion coil, only sensible heat is exchanged with the air in conditioned living space 12 by sensible heat exchanger 34, so that the temperature of the air supplied to living space 12 can be increased while keeping the humidity low, and the humidity of the air exhausted to attic space 13 can be reduced. This makes it possible to improve the temperature and humidity environments in living space 12 and attic space 13.

[0046] In addition, by installing a relative humidity sensor 61 and a temperature sensor 62 in the living space 12 and performing control according to the flows shown in Figures 3 and 4, it is possible to improve the temperature and humidity environment in the indoor space 11 while maintaining the temperature and humidity in the living space 12 at predetermined values ​​and achieving energy savings.

[0047] In the present embodiment, the direct expansion coil 32 and the exhaust fan 35 are turned on and off by the control means, but they may be turned on and off manually. Also, the intake fan 31 is always in operation, but it may be turned off as needed.

[0048] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0049] 3 Air conditioning and ventilation system, 10 Outdoor space, 12 Living space, 13 Attic space, 18 Air conditioner, 21 Outdoor air intake, 22 Air intake, 23, 24 Air outlet, 30 Air conditioning and ventilation unit, 31 Supply air fan, 32 Direct expansion coil, 34 Sensible heat exchanger, 35 Exhaust fan, 61 Relative humidity sensor, 62 Temperature sensor.

Claims

1. An air intake for taking in outside air; an intake fan that supplies outside air taken in through the outside air intake; A direct expansion coil that cools and dehumidifies the outside air sent from the intake fan; An air intake for taking in air from the living space; a sensible heat exchanger that exchanges sensible heat of the air in the living space taken in through the air intake with sensible heat of the air cooled and dehumidified by the direct expansion coil; an exhaust fan that exhausts the air exchanged by the sensible heat exchanger into an attic space; an outlet that supplies the air exchanged by the sensible heat exchanger to the living space.

2. a relative humidity sensor for measuring the relative humidity of the living space; A temperature sensor for measuring a temperature of the living space; The air conditioning and ventilation system according to claim 1, further comprising a control means for controlling operation of at least one of the direct expansion coil and the exhaust fan in accordance with the relative humidity measured by the relative humidity sensor and the temperature measured by the temperature sensor.

3. The air conditioning and ventilation system according to claim 2 , further comprising an air conditioner capable of selecting a cooling mode or a heating mode, in the living space.

4. 4. The air conditioning and ventilation system according to claim 3, wherein the control means cools the direct expansion coil and operates the exhaust fan when the relative humidity measured by the relative humidity sensor is higher than a predetermined humidity when the air conditioner is in a cooling mode.

5. 4. The air conditioning and ventilation system according to claim 3, wherein the control means cools the direct expansion coil and stops the exhaust fan when the relative humidity measured by the relative humidity sensor is less than a predetermined humidity and the indoor temperature measured by the temperature sensor is higher than a set temperature of the living space when the air conditioner is in a cooling mode.

6. 4. The air conditioning and ventilation system according to claim 3, wherein the control means heats the direct expansion coil and stops the exhaust fan when the room temperature measured by the temperature sensor is higher than a set temperature of the room space when the air conditioner is in a heating mode.

Images