JPH10141725A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system in which a package type separate air conditioner is provided with a surrounding air cooling mechanism. SOLUTION: A plurality of duct sets 14, 15 composed of air feeding ducts 14A, 15A and air discharging ducts 14B, 15B are arranged separately from an individual air conditioner 13. Discharging ducts 14B and 15B in the duct sets 14, 15 are provided with discharging fans 16, 17. In the case that a room temperature detected by a room temperature sensor 18 is equal to or less than a set value and 4 surrounding air temperature detected by a surrounding air sensor 19 is equal to or less than a reference value, a separate air conditioner 13 is stopped under an instruction set by a controller 20, and discharging fans 16, 17 are operated in sequence or stopped in operation so as to control an amount of surrounding air fed into the room 1 and the cooling operation is carried out only with the surrounding air.

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 using an air conditioner, and more particularly to an air conditioning system provided with an outside air cooling mechanism.

[0002]

2. Description of the Related Art Conventionally, as an air conditioning system to which an outside air cooling mechanism is added, there has been a single duct type air conditioning system. FIG. 6 shows such an air conditioning system.
A large-sized air conditioner 1 is installed in a machine room B in a building A, and a first air supply duct 2 for introducing outside air to the air conditioner 1 and a conditioned air for supplying conditioned air into the room C are provided. The second air supply duct 3 is connected. Further, an exhaust duct 4 for communicating the room C with the outside of the building A is provided.
Is provided with an exhaust fan 5. Further, a total heat exchanger 6 is interposed between the first air supply duct 2 and the exhaust duct 4, and dampers (motor dampers) 7a and 7b are provided in the two ducts 2 and 4. I have. In addition,
The first air supply duct 2 and the exhaust duct 4 are communicated with each other via a bypass duct 8, and the bypass duct 8 is also provided with a damper 7c.

In the above-described air conditioning system, when performing normal cooling and heating, the total heat exchanger 6 is operated in a heat exchange mode, the outside air is brought close to room temperature, taken into the air conditioner 1, and the air conditioner 1 controls the air conditioner. The cooled air or warm air is sent to the room C, and the air in the room C is discharged to the outside by the operation of the exhaust fan 5 to perform ventilation. On the other hand, when the outside air temperature is lower than the room temperature and cooling is required, the total heat exchanger 6 and the air conditioner 1 are switched to the blow mode operation, and the outside air is directly passed from the first air supply duct 2 to the second air supply duct 2. The air is sent to the room C via the air supply duct 3, and so-called outside air cooling is performed to reduce the energy consumption. When ventilation is not performed, the dampers 7a and 7b in the first air supply duct 2 and the air exhaust duct 4 are used.
And the damper 7c in the bypass duct 8 is opened to circulate the air in the chamber C.

[0004]

By the way, the amount of heat to be removed by the outside air cooling can be obtained by keeping the cooling load in the room C constant.
It largely depends on the outside air introduction amount (air volume), and the effect of the outside air cooling increases as the outside air introduction amount increases. For this reason, in the air conditioning system described above, the opening degree of the damper 7a in the air supply duct 2 is controlled based on the set temperature in the room C and the outside air temperature, and the set room temperature is controlled by proportionally controlling the outside air introduction amount. I was trying to get it.

However, for example, if the floor area is about 3000 m
^In general, package-type individual air conditioners (such as ceiling cassettes) are used for cooling in small-scale buildings of ² or less. Attempts to add it will require a complicated control mechanism to proportionally control the amount of outside air, in addition to the modification of the individual air conditioner itself, and its share in the construction cost of the entire building will increase significantly. I had to give up.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. It is an object of the present invention to make modifications to a package type individual air conditioner and to make it easy to open air without relying on a complicated control mechanism. The purpose of the present invention is to make it possible to add a cooling mechanism.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a duct assembly comprising an air supply duct for introducing outside air into a room and an exhaust duct for discharging room air to the outside. Control means for installing a plurality of sets independently of the package type individual air conditioner, providing a ventilation device for each duct group, and controlling on / off of the individual air conditioner and the ventilation device in each duct group based on the set room temperature and the outside temperature Is provided.

In the air-conditioning system thus configured, the amount of outside air introduced can be easily reduced by simply turning on / off the ventilators in a plurality of duct sets provided independently of the package-type individual air conditioners, that is, controlling the number of units. Can be controlled.

According to the present invention, an exhaust fan can be used as a ventilation device in each of the above-mentioned duct sets. In this case, the structure for ventilation is simplified. The present invention may also be arranged such that one of the exhaust fans is replaced with a total heat exchanger. By using the total heat exchanger, the energy consumption of the individual air conditioner can be suppressed by setting the total heat exchanger to the heat exchange operation mode during normal air conditioning without performing outside air cooling.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of the present invention. In the figure, 10 is a building, 11 is a room that needs air conditioning, 12 is a ceiling space, and a package type individual air conditioner (AC) 13 has a ceiling 11 in the ceiling space 12. It is arranged toward. The ceiling space 12 includes air supply ducts 14A and 15A for introducing outside air into the chamber 11 and exhaust ducts 14B and 15B for discharging air in the chamber 12 to the outside. Duct sets 14 and 15 are installed, and each duct set 1
Exhaust fans (EF) 16 and 17 as ventilating devices are provided in the exhaust ducts 14B and 15B of 4 and 15, respectively.
The individual air conditioner 13 and the duct groups 14, 1
The number of installations 5 can be increased according to the floor area of the room 11, but here, for convenience of explanation, a configuration including one individual air conditioner 13 and two duct sets 14, 15 As shown.

Further, a room temperature sensor 18 for detecting the temperature in the chamber 12 and an outside air temperature sensor 19 for detecting the temperature of the outside air taken into the air supply duct 15B in the one duct set 15 are provided. The signal at 19 is
Is sent to a controller (control means) 20 installed on the side wall of the controller. The controller 20 has a function of controlling the individual air conditioners 13 and the blowers 16 and 17 in each of the duct sets 14 and 15 based on the set room temperature and the outside air temperature.

More specifically, the controller 20 is configured as shown in FIG.
As shown in, set for room temperature T _R, than this set slightly lower reference air temperature T _O, the individual air conditioners at a lower range than the room temperature set room temperature T _R lower than and outside temperature reference air temperature T _O 13 heating operation, the room temperature is set at room temperature T _R to the cooling operation of the individual air conditioner 13 is higher than and higher outside air temperature is higher than the reference outside air temperature T _O range, the room temperature is set at room temperature T higher than the _R and the non-criterion is the outside air temperature In the range lower than the temperature T _O , each duct set 1
It has a function of performing on / off operation (outside air cooling) of the blowers 16 and 17 in the air conditioners 4 and 15, respectively.

In the present first embodiment is high and outside air temperature than the room temperature set room temperature T _R as described above is to perform the outdoor air cooling is lower than the reference air temperature T _O, the setting room temperature T _R varies depending on the season, for example, about 26 ° C. in summer, 22 ° C. of about in the winter, the intermediate season are a temperature of about 24 ° C.. Then, at the time of outside air cooling, in a state where the operation of the individual air conditioner 13 is stopped, as shown in FIG. 3, control for sequentially operating or stopping the blowers 16 and 17 in the respective duct sets 14 and 15, that is, control of the number of units is performed. Then, the amount of outside air introduced into the chamber 11 is controlled. This allows
Since the inside of the room 11 is maintained at the set temperature only by the outside air cooling, and the operation of the individual air conditioner 13 is stopped during this time, the energy consumption is reduced. Incidentally, the set room temperature T _R and the reference air temperature T _O is actually has a predetermined temperature range (about 2 degrees), room temperature is controlled within the temperature range.

On the other hand, when the room temperature is lower than the set room temperature T _R and the outside air temperature is lower than the reference outside air temperature T _O , or when the room temperature is higher than the set room temperature T _R and the outside air temperature is higher than the reference outside air temperature T _O , As described above, cooling and heating are performed by the individual air conditioner 13, but in this case, for ventilation, the blower 16,
One of the seventeen may be driven.

FIG. 4 shows a second embodiment of the present invention. The feature of the second embodiment is that one of the duct sets 15 in the first embodiment is used.
A total heat exchanger 21 is used in place of the exhaust fan 17 inside, and the total heat exchanger 21 is connected to the air supply duct 15A and the exhaust duct 15.
B. When performing the outdoor air cooling in the second embodiment, the total heat exchanger 21 is switched to the air blow mode operation, treated in the same manner as the exhaust fan, and the same as the air blower 16 in the first embodiment. The number of all heat exchangers 21 is controlled. On the other hand, cooling by the individual air conditioner 13
When heating is performed, the total heat exchanger 21 is set to the heat exchange operation mode, the operation of the remaining exhaust fan 16 is stopped, and the individual air conditioner 13 is operated. This makes it possible to bring the ventilation air closer to room temperature and take it into the room 11, thereby reducing the energy consumption of the individual air conditioner 13.

Here, the first embodiment, the second embodiment, and the conventional individual air conditioning system that does not perform outside air cooling are described in a known theory (“Building environmental science of light and heat learned by numerical calculation”). Masanori Sukuya, published by Maruzen Co., Ltd., 217-22
Using p.5), the annual energy consumption for air conditioning was roughly calculated, and the results shown in Fig. 5 were obtained. Note that when this calculation is set at room temperature T _R to summer (June, September) 26 ° C., Winter (. 12 to March) 22 ° C., the intermediate season (4,
May, October, November) Set to 24 ° C, and during the period with cooling load on weekdays 9
~ 18: 00, Saturday 9 ~ 13: 00, and the cooling load in the building is 40W /
m ² and constant. From the results shown in FIG. 5, the annual energy consumption of the system according to the first embodiment that incorporates outside air cooling is reduced to about 55% of the system that does not perform outside air cooling. It is clear that it will contribute. Further, the first embodiment and the second embodiment
From the comparison with the embodiment, it became clear that the energy saving can be further achieved (about 50% of the system without the outside air cooling) by incorporating the total heat exchanger into the outside air cooling.

[0018]

As described above in detail, according to the air conditioning system according to the present invention, the package type individual air conditioner can be easily modified without adding a special modification or using a complicated control mechanism. An external air cooling mechanism can be added, and the increase in equipment costs can be minimized.
The usage value is significantly improved. Further, when an exhaust fan is used as a ventilation device in each duct set, an increase in equipment cost can be further suppressed. Further, when one of the exhaust fans is replaced with a total heat exchanger, the energy consumption of the individual air conditioner can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an air conditioning system according to a first embodiment of the present invention.

FIG. 2 is a graph showing operating conditions of an individual air conditioner and outside air cooling in the present air conditioning system.

FIG. 3 is a graph showing control contents at the time of outside air cooling in the present air conditioning system.

FIG. 4 is a schematic diagram illustrating an air conditioning system according to a second embodiment of the present invention.

FIG. 5 is a graph showing the annual energy consumption of the present invention in comparison with that of an air conditioning system that does not perform outside air cooling.

FIG. 6 is a schematic diagram showing a conventional single-duct air conditioning system to which an outside air cooling mechanism is added.

[Description of Signs] 10 Building 11 Room 12 Ceiling Void 13 Package Type Individual Air Conditioner 14, 15 Duct Group 14A, 15A Supply Duct 14B, 15B Exhaust Duct 16, 17 Exhaust Fan (Ventilation Device) 18 Room Temperature Sensor 19 Outside Temperature sensor 20 Controller (control means) 21 Total heat exchanger

Claims (3)

[Claims] 1. A plurality of duct sets each including an air supply duct for introducing outside air into a room and an exhaust duct for discharging room air to the outside are installed independently of the package type individual air conditioner, An air conditioning system comprising: a ventilation device provided in each duct set; and an individual air conditioner and control means for controlling on / off of a ventilation device in each duct set based on a set room temperature and an outside air temperature. 2. The air conditioning system according to claim 1, wherein the ventilation device in each set of ducts comprises an exhaust fan. 3. The air conditioning system according to claim 2, wherein one of the exhaust fans is replaced by a total heat exchanger.