JP2002349924A - Air-conditioning ventilating unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioning ventilation unit having an improved efficiency, attaining an energy saving. SOLUTION: First and second heat-recovery air-paths A, B respectively, and an outdoor air-path C are formed in a unit body 1; the air path A communicatingly connects a ceiling-air inlet 2 with a ceiling-air outlet 3; and the air path B connects communicatively a return-air inlet 6 with an exhaust outlet 7. The outdoor air-path C communicatingly connects an outdoor air inlet 4 with an outdoor outlet 5. A first sensible heat exchanger 8 is placed astride the air-paths A and C to heat-exchange the outdoor air from the inlet 4 with the ceiling air coming from the inlet 2. A second total heat exchanger 9 is placed astride the air paths B and C to heat-exchange the return air from the inlet 6 with the outdoor air from the inlet 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an air conditioning and ventilation unit.

[0002]

2. Description of the Related Art An air-conditioning ventilation unit provided with a total heat exchanger and the like is used when supplying outside air to a room for building air conditioning or the like.

[0003]

However, the conventional air-conditioning and ventilation unit has a poor heat exchange efficiency with the outside air, requires a heat exchanger having extremely high capacity during the heating operation, and requires a large size and a large installation space. Costly,
Humidification efficiency to outside air was also poor. Then, it aims at providing the air-conditioning ventilation unit which solves these problems.

[0004]

In order to achieve the above object, an air-conditioning and ventilation unit according to the present invention comprises an airframe, a ceiling air inlet, a ceiling air outlet, an outside air inlet, an outside air outlet, a return air inlet, and an exhaust outlet. Formed inside the fuselage, a first heat recovery air passage that connects and connects the ceiling air inlet and the ceiling air outlet, a second heat recovery air passage that connects and connects the return air inlet and the exhaust outlet, and an outside air inlet. A first sensible heat exchanger or a total heat exchanger for ceiling heat recovery for exchanging heat between the outside air from the outside air inlet and the ceiling air from the ceiling air inlet. A heat exchanger is provided astride the first heat recovery air passage and the outside air air passage, and further, a second heat recovery heat recovery air passage for exchanging heat between the return air from the return air inlet and the outside air from the outside air inlet. A heat exchanger or a total heat exchanger was provided across the second heat recovery air passage and the outside air passage. Further, a first sensible heat exchanger or a total heat exchanger is provided astride the outside air passage and the first heat recovery passage on the windward side of the outside air passage. A second sensible heat exchanger or a total heat exchanger was provided across the heat recovery air duct. Further, a humidifier was provided downstream of the first sensible heat exchanger or the total heat exchanger and the second sensible heat exchanger or the total heat exchanger in the outside air passage. Further, a sensible heat exchanger is inserted in a rectangular cylindrical frame through which air passes, and a heat transfer tube through which a different air from the air passes through the pair of opposing surfaces of the rectangular cylindrical frame. And a group. A large number of heat transfer plates formed by projecting a large number of short tube portions are arranged in parallel, and the end portion of the short tube portion of one adjacent heat transfer plate and the base end portion of the short tube portion of the other heat transfer plate are arranged. A sensible heat exchanger was formed by communicating and connecting to form a plurality of tubular portions through which separate air flows inside and outside.

[0005]

1 to 4 show an embodiment of an air conditioning and ventilation unit according to the present invention. This air conditioning and ventilation unit has a box-shaped hollow body 1 and an air inlet 2 in a ceiling. A ceiling air outlet 3, an outside air inlet 4, an outside air outlet 5, a return air inlet 6, and an exhaust outlet 7 are formed.
Heat recovery air passage A that connects the air outlet 3 in the ceiling with the air outlet 3
And a second heat recovery air passage B connecting and connecting the return air inlet 6 and the exhaust outlet 7, and an outside air passage C connecting and connecting the outside air inlet 4 and the outside air outlet 5. A first sensible heat exchanger 8 for heat recovery in the ceiling that exchanges heat with the air in the ceiling from the air inlet 2 in the ceiling across the first heat recovery air passage A and the outside air air passage C; The second total heat exchanger 9 for heat recovery of the return air, which exchanges heat between the return air from the return air inlet 6 and the outside air from the outside air inlet 4, includes a second heat recovery air passage B and an outside air air passage C.
And straddle it. The flow of air is shown in FIGS.
In the drawings, thick solid arrows, dotted arrows, dashed-dotted arrows, and two-dot dashed arrows show, and in other drawings, solid and dotted white arrows show.

[0006] The second heat recovery airflow path B is diverted on the way, a second total heat exchanger 9 is provided in one of the airflow paths, and the other airflow path is a bypass airflow path D. A bypass damper 14 is provided so that return air flow can be switched to only one of the branch airflow paths and the other (bypass airflow path D). On the windward side of the outside air passage C, the outside air passage C and the first heat recovery passage A
A first sensible heat exchanger 8 is provided over the outside air passage C, and a second total heat exchanger 9 is provided on the leeward side of the outside air passage C over the outside air passage C and the second heat recovery passage B. The heat exchange between the outside air and the return air is performed after the heat exchange between the inside air and the ceiling air. Further, in the outside air passage C, the first sensible heat exchanger 8
And humidifier 11 more leeward than either of the second total heat exchanger 9
Is provided. The first heat recovery air path A, the second heat recovery air path B, and the outside air path C are provided with blowers 17, 18, and 19, respectively.

The sensible heat exchanger 8 has a rectangular cylindrical frame 12 through which air (air in the ceiling or outside air) passes, and the rectangular cylindrical frame 1.
A heat transfer tube group 13 which is inserted so as to penetrate the pair of two opposing surfaces and through which the air and another air (air in the ceiling or outside air) pass. Heat is exchanged via the heat tube group 13. The heat transfer tube group 13 includes a large number of heat transfer tubes 15 arranged in parallel with a predetermined gap therebetween. If outside air is allowed to pass through the inside of the heat transfer tube 15, moisture will condense on the outer peripheral surface of the heat transfer tube 15 during the heating operation, so that even if it freezes, trouble such as rupture does not occur. Heat transfer tube 1
Numeral 5 may be a circular tube, but is preferably an elliptical tube, and the major axis of the ellipse is substantially parallel to the ventilation direction. The total heat exchanger 9 is formed in a rectangular parallelepiped shape in which four outer peripheral surfaces form a ventilation surface. Separate air flows from two adjacent ventilation surfaces, and the return air and the outside air are heat-exchanged through the internal heat exchange member.

The outside air outlet 5 of the body 1 is connected to the interior of the vehicle directly or through a duct. The outside air inlet 4 of the airframe 1 communicates with the outside through a duct, and the in-ceiling air inlet 2 communicates with the inside of the ceiling directly or through a duct. At the time of the heating operation, the bypass damper 14 is closed, the low-temperature outside air is taken into the body 1 from outside by the blower 19, and at the same time, the air in the ceiling which is higher in temperature than the outside air by the blower 17 and the air whose temperature is higher than the air in the ceiling by the blower 18 are returned. The ki is taken into the fuselage 1 respectively. The sensible heat is exchanged between the outside air and the air in the ceiling in the sensible heat exchanger 8, and the outside air is heated (preheated) by the heat of the air in the ceiling. Further, the preheated outside air undergoes total heat exchange in the total heat exchanger 9, and the preheated outside air is further heated by the heat of the return air.
Is humidified. This outside air is taken indoors. The heat-recovered ceiling air is returned to the ceiling, and the heat-recovered return air is exhausted outside. At the time of cooling operation or the like, the bypass damper 14 may be opened to stop the blower 17 and send the fresh air.

FIGS. 5 and 6 show another embodiment of the sensible heat exchanger 8, in which the heat transfer plate 2 formed by projecting a number of short pipe portions 20 is shown.
A number of the heat transfer plates 21 are arranged side by side, and the leading end of the short tube portion 20 of one adjacent heat transfer plate 21 and the base end of the short tube portion 20 of the other heat transfer plate 21 are communicatively connected to each other so that the inside and the outside thereof are connected. The sensible heat exchanger 8 is formed by forming a large number of tubular portions 22 through which different air (air in the ceiling and outside air) pass. The short pipe portions 20 and the heat transfer plates 21 are arranged at a predetermined interval, and the outside air is
If it passes through the inside, moisture condenses on the outer peripheral surface of the tubular portion 22 during the heating operation, so that even if it freezes, a failure such as rupture does not occur. The cross-sectional shape of the tubular portion 22 may be circular or elliptical, and the major axis of the ellipse is substantially parallel to the ventilation direction.

Although not shown, in each of the above embodiments, the structure of the sensible heat exchanger 8 and the total heat exchanger 9 can be freely changed, and various known sensible heat exchangers and total heat exchangers can be used. You may. Further, a total heat exchanger may be used instead of the first sensible heat exchanger 8, and a sensible heat exchanger may be used instead of the second total heat exchanger 9. Further, a first sensible heat exchanger 8 is provided on the leeward side of the outside air passage C over the outside air passage C and the first heat recovery passage A, and the first sensible heat exchanger 8 is located on the windward side of the outside air passage C. The second total heat exchanger 9 may be provided across the two heat recovery air passages B, and the heat exchange between the outside air and the ceiling air may be performed after the heat exchange between the outside air and the return air.

[0011]

According to the first aspect of the present invention, during a heating operation or the like, the heat of the air accumulated in the ceiling is recovered without wasting and effectively used for preheating the outside air, and the return air heat is recovered and the outside air is sent. As a result, the heat exchange amount can be increased and efficiency can be improved, and energy saving, downsizing and cost reduction of the air conditioning and ventilation unit can be achieved. According to the second aspect of the present invention, the outside air passes from the first sensible heat exchanger or the total heat exchanger to the second sensible heat exchanger or the total heat exchanger in the same manner as a so-called counterflow (countercurrent). Since heat exchange with little waste can be performed, the heat recovery efficiency (heat exchange capacity) is high, and the size of the first and second sensible heat exchangers or the total heat exchanger can be reduced and further energy saving can be achieved. According to the third aspect of the invention, even during the heating operation, the outside air temperature can be reliably heated to a temperature at which the humidification efficiency is improved.
The size and efficiency of the humidifier can be reduced. According to the invention of claim 4, since heat is exchanged through independent heat transfer tubes one by one,
During the heating operation, it is hard to freeze even in a cold area where the outside air temperature is extremely low, and can always exhibit stable heat recovery ability. According to the fifth aspect of the present invention, the number of parts of the sensible heat exchanger can be reduced, processing is easy, cost is reduced, and heat exchange efficiency is good.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing one embodiment of the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a simplified perspective view with a part omitted.

FIG. 4 is a perspective view of a sensible heat exchanger.

FIG. 5 is another embodiment of the sensible heat exchanger.

FIG. 6 is a sectional view of a main part of FIG. 5;

[Description of Signs] 1 Airframe 2 Air Inlet in Ceiling 3 Air Outlet in Ceiling 4 Outside Air Inlet 5 Outside Air Outlet 6 Return Air Inlet 7 Exhaust Outlet 8 Sensible Heat Exchanger 9 Total Heat Exchanger 11 Humidifier 12 Square Cylindrical Frame 13 Transmission Heat tube group 20 Short tube part 21 Heat transfer plate 22 Tubular part A First heat recovery air path B Second heat recovery air path C Outside air path

Claims (5)

[Claims] An air inlet inside a ceiling, an air outlet inside a ceiling, an outside air inlet, an outside air outlet, a return air inlet and an exhaust outlet are formed in a body, and an air inlet inside a ceiling is formed inside the body. 1 and a second heat recovery air passage B connecting and connecting the return air inlet 6 and the exhaust outlet 7 to each other.
Air passage C connecting the outside air inlet 4 and the outside air outlet 5
And a first sensible heat exchanger 8 or a total heat exchanger for heat recovery in the ceiling for exchanging heat between the outside air from the outside air inlet 4 and the air in the ceiling from the air inlet 2 in the ceiling. One heat recovery wind path A
And a second sensible heat exchanger or total heat exchanger for heat recovery of the return air for exchanging heat between the return air from the return air inlet 6 and the outside air from the external air inlet 4. 9. An air-conditioning and ventilation unit, wherein 9 is provided across the second heat recovery air passage B and the outside air air passage C. 2. An outside air passage C on the windward side of the outside air passage C
The first sensible heat exchanger 8 or the total heat exchanger is provided so as to extend over the first heat recovery air passage A, and the outside heat air passage C and the second heat recovery air passage B are arranged on the leeward side of the outside air air passage C. The air conditioning and ventilation unit according to claim 1, further comprising a second sensible heat exchanger or a total heat exchanger. In the outside air passage C, the first sensible heat exchanger 8 or the total heat exchanger and the second sensible heat exchanger or the total heat exchanger 9
The air-conditioning ventilation unit according to claim 1 or 2, wherein the humidifier (11) is provided on the leeward side of any one of the following. 4. A sensible heat exchanger 8 is inserted into a rectangular cylindrical frame 12 through which air passes and a pair of opposing surfaces of the rectangular cylindrical frame 12 to separate the inside from the air. The air conditioning ventilation unit according to claim 1, further comprising: a heat transfer tube group through which the air passes. 5. A plurality of heat transfer plates 21 formed by projecting a large number of short tube portions 20 are arranged side by side, and the tip of the short tube portion 20 of one adjacent heat transfer plate 21 and the other heat transfer plate. A sensible heat exchanger (8) comprising a plurality of tubular portions (22) formed by communicating the base ends of the short tube portions (21) with a plurality of tubular portions (22) through which separate air passes inside and outside. The described air conditioning ventilation unit.