JP2823515B2 - Ductless type outside air introduction air conditioning system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for a building, and more particularly to a ductless type outside air introduction air conditioning system for a store or the like where a large amount of outside air introduction capability is required.

[0002]

2. Description of the Related Art In an air conditioner, a predetermined outside air introduction amount is determined by the number of persons in a target building. Therefore, in a theater, a store, or the like where the density of occupants increases, the amount of fresh air taken in per unit volume of a building is larger than in a normal office or the like. The introduced outside air is generally taken in as fresh air in the air conditioner, mixed with the recovered air from the room, sent to the air conditioner, conditioned (cooled, heated, or dehumidified), and blown out into the room. . Excess air generated by taking in outside air as fresh air is discarded to the outside by, for example, exhausting part of the recovered air. That is, the amount of fresh air introduced from the outside air and the amount of exhaust are substantially the same.

On the other hand, in an air conditioner, cooling, heating, or dehumidification of the urethane air is performed so as to meet predetermined indoor environmental conditions. This translates into a so-called cooling and heating load. In this case, especially in summer, when there is a large difference between the outside air condition and the indoor condition,
In winter, the cooling and heating load increases. In a store or the like where a large amount of outside air is required to be introduced, a large amount of outside air having a large temperature difference must be air-conditioned, so that the cooling and heating load is further increased. Therefore, in the air conditioning equipment of such a large building, an air conditioner or the like is selected with a cooling and heating capacity corresponding to the amount of outside air introduced by the maximum capacity.

[0004]

In a building such as a store where a large amount of outside air is required to be introduced, as described above, an air conditioner or the like is selected with a cooling / heating capacity corresponding to the amount of outside air introduced by the maximum capacity. However, for example, before the store is opened or after the store is closed, the number of occupants in the room is significantly smaller than the maximum capacity. In such a situation, performing air conditioning by taking in an unnecessary large amount of outside air wastefully exhausts the conditioned air to the outside, resulting in a significant waste of air conditioning energy. In particular, waste of air conditioning energy, which accounts for a large proportion of the building power consumption, results in a large increase in running costs.
Also, from the viewpoint of initial cost, duct equipment for securing a large amount of outside air introduced has increased equipment costs due to duct material costs, heat insulation material costs, construction costs, and the like. The present invention has been made in view of the above circumstances,
A ductless type outside air introduction air-conditioning system that can secure large outside air introduction capacity, prevent unnecessary exhaust of conditioned air when there are few occupants, and eliminate the need for duct construction leading to an increase in equipment costs. It is intended to reduce the running cost and the initial cost.

[0005]

In order to achieve the above object, a ductless type outside air introduction air-conditioning system according to the present invention comprises a closed ceiling space, a ceiling space is constructed, and an exhaust side is connected to the ceiling space. An air supply fan is provided that opens directly into the chamber, and an outside air introduction duct and a return air duct that collects urethane air from inside the room are branched and connected to the air supply side of the air supply fan, and the outside air intake duct is connected to the outside air introduction duct. An air conditioner that has an outside air control damper that can change the air flow and a return air control damper that can change the amount of return air is provided in the return air duct. Is provided in the chamber above the ceiling, and exhaust means for exhausting the same amount of indoor air as the amount of outside air introduced from the outside air introduction duct is provided.

[0006]

Normally, the required outside air amount corresponding to the maximum number of occupants is supplied from the outside air introduction duct, and the introduced outside air is mixed with the sales room air and supplied to the inside of the ceiling back chamber, and is sucked into each air conditioner. The air conditioner air-conditions this air supply,
Supply indoor air as supply air. The exhaust means exhausts the same amount of indoor air as the amount of introduced outside air to the outside. On the other hand, when the number of occupants in the room before opening or after closing is small, the outside air control damper is throttled, and at the same time, the return air control damper is opened to increase the amount of air returned from the room. This suppresses the exhaust of room air that has already been air-conditioned and the introduction of outside air having a large cooling / heating load, thereby preventing an increase in the cooling / heating load.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a ductless outside air introduction air-conditioning system according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic view of the configuration of the ductless outside air introduction air conditioning system of the present invention. In the ductless type outside air introduction air-conditioning system according to the present embodiment (hereinafter, referred to as “outside air conditioning system”), the space above the ceiling 1 in which the space above the ceiling is closed is configured.
It has become. The slab 3 with the roof or upper floor is insulated from the under-chamber 1 while the ceiling 5 has a non-insulated structure. An air supply fan 7 is provided in the ceiling-behind chamber 1, and an exhaust port 7 a of the air-supply fan 7 opens directly into the ceiling-behind chamber 1. That is, the air blown out from the air supply fan 7 is directly supplied into the under-chamber 1.

An air supply duct 9 is connected to the air supply side of the air supply fan 7, and the air supply duct 9 is branched into an outside air introduction duct 11 and a return air duct 13. The outside air introduction duct 11
It has an outside air control damper 15 and its end is connected to an outside air intake 17 outside. The return air duct 13 has a return air control damper 19, and is connected to a return air opening 21 whose end opens at the ceiling 5. That is, the air supply ratio of the air supply fan 7 can be freely adjusted by opening and closing the outside air control damper 15 or the return air control damper 19.

A plurality of air conditioners 23 of a direct blow type are provided in the under-chamber 1, and the air-conditioners 23 are provided with an air supply port 23 a opened in the under-chamber 1, a ceiling retan opening 23 b opened in the ceiling 5, And the outlet 23 opening in the ceiling 5
c. Accordingly, the air conditioner 23 air-conditions (cools, heats, and dehumidifies) the supplied air in the ceiling space 1 and the air directly supplied from the ceiling 5 and blows the air into the room 25. The air conditioner 23 is provided at a predetermined design position.
Since the entire inside plays the role of an air supply duct, it can be mounted very easily at an arbitrary ceiling position without troublesome air supply duct construction.

In the back-of-the-ceiling chamber 1, two first exhaust fans 27 and second exhaust fans 29, which are exhaust means, are provided, and the exhaust sides of the first exhaust fan 27 and the second exhaust fan 29 are respectively provided. It is connected to the outside by an exhaust duct 31. An air supply duct 33 is connected to the air supply side of the first exhaust fan 27, and the air supply duct 33 has a check volume damper 35 of a backflow prevention type. An air supply duct 37 is connected to the air supply side of the second exhaust fan 29, and the air supply duct 37 has a backflow prevention type check volume damper 39. By the way, the first exhaust fan 27 and the second exhaust fan 29 have different exhaust capacities. In other words, the first exhaust fan 27 has an exhaust capacity corresponding to the amount of outside air required before opening or after closing the store (that is, the amount of outside air required for fixed occupants such as clerks). On the other hand, the second exhaust fan 29 has an exhaust capacity corresponding to the outside air introduction amount necessary for the maximum number of occupants. And
The air supply ducts 33 and 37 of the first exhaust fan 27 and the second exhaust fan 29 are integrated, and the end is an exhaust port 41 and is opened to the ceiling 5.

The operation of the thus configured external tone adjusting system 43 will be described. In the case where the outside air conditioning system 43 is provided in a commercial facility such as a store, for example, during normal business hours, the sales floor air tan air Qk and the total outside air amount Qo corresponding to the number of clerks and peak customers are mixed in the under-chamber 1 and the ceiling air is mixed. The air is supplied to each of the air conditioners 23 arranged in 5. The air conditioner 23 air-conditions (cools, heats, and dehumidifies) the indoor air Qr supplied from the ceiling urethane opening 23b together with the air supply (Qk + Qo).
Air is supplied to the sales floor (indoor) 25 as supply air Qs. That is, the supply air Qs from the air conditioner 23 is Q
s = Qr + Qk + Qo.

On the other hand, the exhaust is performed by simultaneously driving the first exhaust fan 27 and the second exhaust fan 29, the sum of the exhaust capacity corresponding to the required outside air amount of the clerk and the required outside air amount of the peak customer. At this time, the total exhaust amount Qe is substantially equal to the total outside air amount Qo described above.

Before the store is opened or after the store is closed, the outside air control damper 15 is throttled while the return air control damper 19 is closed.
By increasing the amount of return air from the sales floor 25,
Make effective use of indoor air that has already been conditioned. Therefore,
At this time, the relationship between the outside air quantity qo and the sales floor urethane air qk is Qo> qo and Qk <qk as compared with the normal state. At the same time, the second exhaust fan 29 is stopped, and the total exhaust amount qe is controlled to be equal to the outside air amount qo.

As described above, according to the above-mentioned outside air conditioning system 43, even when a large heating load is required, especially at the start-up in the winter morning, a large amount of outside air is introduced which causes a further increase in the heating load. Further, since the discharge of the conditioned air can be prevented, the air conditioning energy is not wasted and the running cost can be reduced. Also, at this time, by shutting down or restricting the outside air and increasing the sales floor air qk, it is possible to recover the heat generated by the sales floor lighting and the like and the heat storage of the building body, thereby also reducing the heating load. Since the outside air conditioning system 43 employs an under-the-chamber system in which air is supplied directly from above the ceiling, the duct work can be greatly simplified, and the effect of increasing the degree of freedom of the installation position of the air conditioner 23 also arises. .

In the above-described embodiment, the exhaust means includes a first exhaust fan 27 having an exhaust capacity required before opening or after the store is closed, and a second exhaust fan 29 having an exhaust capacity necessary for the maximum number of occupants. However, the exhaust means may of course be one provided with one variable flow rate exhaust fan that satisfies these exhaust capacities. Further, in the case of using such a variable flow rate exhaust fan, the outside air control damper 15 and the return air control damper 19 are motor dampers capable of stepless control, and a occupant grasping means (for example, a counter is provided in an infrared sensor or the like). A means for grasping the number of occupants in real time based on the difference between the number of entering and leaving persons, or a method for controlling the number of occupants by time when the number of occupants can be predicted according to time zone) is provided. By controlling the exhaust fan and motor damper in real time, the amount of outside air introduced and the amount of exhaust can be adjusted steplessly according to the occupants in the room, and the air conditioning load that increases due to the introduction of outside air can always be minimized. Become.

[0016]

As described above in detail, according to the ductless type outside air introduction air-conditioning system according to the present invention, the introduction of a large amount of outside air and the discharge of the conditioned air that cause an increase in the cooling / heating load depend on the number of occupants. Therefore, the air conditioning energy is not wasted and the running cost can be reduced. Also, in the winter season, by reducing the outside air and increasing the storefront air, heat generated by the storefront lighting and the like and heat stored in the building can be recovered, thereby also reducing the heating load. And in the ductless type outside air introduction air conditioning system,
Since the air is supplied directly from the ceiling to the ceiling, the duct construction can be greatly simplified, and the degree of freedom of the installation position of the air conditioner can be increased.
As a result, running costs and initial costs can be reduced while securing a large outside air introduction capability.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a ductless outside air introduction air conditioning system of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Above-the-ceiling chamber 7 Air supply fan 11 Outside air introduction duct 13 Return air duct 15 Outside air control damper 19 Return air control damper 23a Air supply port 23c Air outlet 23 Air conditioner 25 Room 27 First exhaust fan (exhaust means) 29 Second exhaust Fan (exhaust means) 43 Ductless outside air introduction air conditioning system

Claims (3)

(57) [Claims] A closed ceiling space forms a ceiling space, and an air supply fan is provided with an exhaust side opened directly to the ceiling space, and outside air is introduced into the air supply side of the air supply fan. The duct and the return air duct that collects urethane air from the room are branched and connected.The outside air introduction duct is equipped with an outside air control damper that can vary the amount of outside air, and the return air duct is able to change the amount of return air. A damper is provided, and an air conditioner having an air supply opening in the above-the-ceiling chamber and an outlet opening in the ceiling is provided in the above-the-ceiling chamber, and the same amount of indoor air as the amount of outside air introduced from the outside air introduction duct is provided. A ductless type outside air introduction air-conditioning system, characterized in that exhaust means for exhausting air is provided. 2. The exhaust means comprises a first exhaust fan and a second exhaust fan, wherein the first exhaust fan has an exhaust capacity corresponding to the amount of outside air required for fixed occupants. 2. The ductless type outside air introduction air conditioning system according to claim 1, wherein the air conditioning system has an exhaust capacity corresponding to an outside air introduction amount necessary for a maximum number of occupants. 3. The outside air control damper and the return air control damper are motor dampers capable of stepless opening / closing control, the exhaust means is an exhaust fan of a variable flow rate type, and the occupant grasping means is provided. 2. The ductless outside air introduction and air conditioning system according to claim 1, wherein the outside air control damper, the return air control damper, and the exhaust fan are steplessly opened and closed according to the number of occupants grasped by the staff grasping means.