JP2000111105A - Air-conditioning system for office building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widely save labor for a piping work and remarkably reduce cost and shorten term of works by the load characteristics of an office building is effectively utilized and yearly cooling is practicable. SOLUTION: The air-conditioner 15 for cooling of a variable airflow system in which a cooling water coil 3 is incorporated and an air-conditioner 16 for combination of cooling and heating of a constant airflow system in which a coil 17 for combination of cold water and hot water is incorporated are combined together. An outgoing pipe 5 and a return pipe 6 for cold water are arranged at a variable airflow system air-conditioner 15 for cooling. An outgoing pipe 18 and a return pipe 19 for combination of cold water and hot water are respectively arranged at the constant airflow system air-conditioner 16 for combination of cooling and heating. Cooling and heating are alternately switched in a way that during cooling, cold water is fed to the coil 17 for combination of cold water and hot water, and during heating, hot water is fed thereto.

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 an office building, and more particularly, to an air-conditioning system for an office building that requires cooling all year round.

[0002]

2. Description of the Related Art Recently, many OA devices and the like are arranged in an office building. These OA devices are in operation,
It is necessary to cool the room all year round because heat is dissipated and heat generated by residents is added.

[0003] However, there is a case where heating is required in the room before the operation of the OA equipment after the holidays in winter. Thus, intelligent office buildings having a function of switching between cooling and heating even in winter are increasing.
A conventional air conditioning system for such an office building will be described with reference to FIG.

An office 1 is provided with two air conditioners 2 capable of cooling and heating, and a cold water coil 3 for cooling and a hot water coil 4 for heating are incorporated in each air conditioner 2. At the same time, a cold water outgoing pipe 5 and a return pipe 6 are connected to the cold water coil 3, and a hot water outgoing pipe 8 and a return pipe 9 are connected to the hot water coil 4.

The return pipes 6, 9 are provided with valves 7, 10 in the vicinity of the air conditioner 2, respectively, for automatic control. During the cooling operation, the valve 7 is opened and the valve 10 is opened.
Is closed and cold water is circulated through the cold water coil 3. Conversely, during the heating operation, the valve 10 is opened and the valve 7 is closed to circulate hot water through the hot water coil 4. Reference numeral 11 denotes an air supply fan, 12 denotes a damper for automatically adjusting the air flow according to the room temperature, and 13 denotes an outlet.

[0006]

SUMMARY OF THE INVENTION As in the above conventional example,
In order to enable cooling and heating in winter, it is necessary to install two coils, a cold water coil and a hot water coil, in each air conditioner, and to connect a return pipe and a return pipe from each coil. As described above, pipes of four systems for each air conditioner require expensive materials such as pipes and valves, a large amount of labor due to installation time, and a large space for piping in the building. It costs a lot of money.

On the other hand, considering the load characteristics of an air conditioner in an office having a floor area requiring two air conditioners, the heating load is extremely smaller than half of the cooling load, and is particularly small in winter. In an office building that does not, it can be said that heating with one air conditioner is sufficient.

Accordingly, a technical problem to be solved arises in order to construct a rational air-conditioning system by effectively utilizing these load characteristics and simplify the piping to save labor in the piping work. Therefore, an object of the present invention is to solve this problem.

[0009]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and has an office in which a large number of heat-generating devices are arranged and which has a floor area that requires at least two air conditioners. In this air conditioning system, a variable air flow system incorporating a variable air flow system incorporating a chilled water coil and a constant air flow system air conditioner incorporating both a cold and hot water coil and a combined air conditioning system are provided. In the cooling air conditioner, the outgoing pipe and the return pipe of the cold water are respectively piped, and in the air conditioner of the constant flow rate system for the cooling and the heating, the outgoing pipe and the return pipe for the both of the cold water and the hot water are respectively piped. In addition, the present invention provides an air-conditioning system for office buildings, characterized in that cooling water is sent to the coil for both cold water and hot water during cooling, and cooling and heating are alternately switched by sending hot water during heating.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. The same components as those of the conventional example will be described using the same reference numerals.

FIG. 1 is an explanatory view of a main part of an air conditioning system in an office 1 of an office building. In the office 1, a number of devices (not shown) that generate heat are arranged. now,
When the number of air conditioners installed is calculated from the cooling load of the office 1 or the like, only one air conditioner may be installed up to the floor area of 500 m ^{2 of the} office 1. However, in the office 1 having a floor area of more than 500 m ² , two air conditioners 15 and 16 are required. The air conditioners 15 and 16 can be set to have the same airflow and to be able to cope with the same load, and the air conditioners 15 and 16 can be set to have a small installation area and to be compact enough to fit in the ceiling. .

The air conditioner 15 is a variable air flow type air conditioner for exclusive use of annual cooling in which the chilled water coil 3 is incorporated. The outgoing pipe 5 and the return pipe 6 of the chilled water are connected to the chilled water coil 3 respectively. The return pipe 6 is provided with a valve 7 near the variable air conditioner 15 to automatically control the circulation of cold water. Reference numeral 11 denotes an air supply fan, and reference numeral 12 denotes a damper that automatically adjusts the air flow according to the room temperature. Reference numeral 13 denotes an outlet for blowing air into the office 1, and reference numeral 14 denotes both air conditioners 1.
It is a mixing box for mixing the wind from 5 and 16, and is sent to the outlet 13 through a pipe 21.

On the other hand, the air conditioner 16 incorporates a coil 17 for both cold water and hot water. The air conditioner 16 is a constant air flow type air conditioner that functions as cooling in summer and in the middle, and functions as heating in winter. The outgoing pipe 18 and the return pipe 19 for both cold water and hot water are connected to the cold water / hot water coil 17, respectively. The return pipe 19 is provided with a valve 20 near the constant air volume type air conditioner 16 to automatically control the circulation of cold or hot water.

Considering the load on the office 1, for example, the load capacity of the variable air-conditioning type air conditioner 15 is set to 100 m ³ / h, and the load capacity of the constant air flow type air conditioner 16 is set to 100 m ³ / h.
Then, during cooling in summer, cold water is circulated also to the coil 17 for both cold water and hot water in the constant air flow type air conditioner 16 to function as a cooler together with the variable air flow type air conditioner 15 so that the total load capacity is 200 m ^3. / H.

Also, during heating in winter, as described above, O
The constant air volume type air conditioner 1 does not need to be heated at all times due to heat generation from the A equipment and the like and is limited to a short time after the holiday.
The hot water is circulated through the cold water / hot water combined coil 17 in 6 to function as a heater, and the load capacity is 100 m ³ / h.
The operation of the constant air volume type air conditioner 16 is sufficient. Further, since the load in the cooling in winter is small, only the variable air-conditioning type air conditioner 15 is operated so that the load capacity 10
It is enough to supply up to 0m ³ / h.

When the cooling load becomes insufficient in winter, the cold air is circulated through the constant air-conditioning type air conditioner 16 as in summer, and the load is controlled in conjunction with the operation of the variable air-conditioning type air conditioner 15. Capable of delivering up to 200 m ³ / h.

FIG. 2 shows a piping system diagram when the air conditioning system of the present invention is installed in an office building. A is the rooftop,
B shows an office and C shows a machine room part. First, a hot water circulation system during heating in winter will be described.

The water is heated by the gas burner 32 according to the set temperature, passes through the pipe 18, the valve 34, and the pump 33a,
The air flows into the hot water coil 17 of the air conditioner 16 through the pipe 33a and the pipe 18, and the air blower fan 11 blows out the hot air through the outlet 13. Return of the hot water from the constant air volume type air conditioner 16 is performed by a valve 20, a return pipe 19,
The gas burner 32 passes through a valve 34a and is pumped by a pump 44.
And the circulation is repeated. At this time, the valves 7, 7a,
7b, 7c and 7d are automatically closed. During heating, the circuit to the expansion water tank 45 on the roof A functions, but the circuit to the cooling towers 30 on both sides of the drawing does not function.

Next, a chilled water circulation system for cooling in summer will be described. Reference numeral 37 denotes a heat storage tank for constantly storing cold water according to a set temperature. The heat storage tank 37 uses a cheap nighttime electric power to pass through a tube 40a and a three-way valve 41 from a strainer 38, is pumped up by a pump 31 and made cold water by a refrigerator 36. Then, the circuit for returning to the heat storage tank 37 is again circulated at night to produce cold water and prepare for use during the day. Cold water is pumped up from the heat storage tank 37 by a pump 31a from a strainer 38, passes through a pipe 39a, passes through a heat exchanger 35, valves 7c and 7d, and cool water produced by a refrigerator 36 is pumped by pumps 33a, 33a and 33.
b, 33b, the cold air flows into the chilled water coil 3 of the variable air-conditioning type air conditioner 15 and the chilled water coil 17 of the constant air volume type air-conditioning device 16 via the outgoing pipes 5, 18 to send the cool air to the air supply fans 11, 11. Each of them is mixed in the mixing box 14 and blown out from the outlet 13. The return of the cold water from each of the air conditioners 15, 16 is performed by the valves 7, 7a, 2
The circulation is repeated through the heat exchanger 35 through the heat exchanger 35 by the pump 31b through the 0 and the return pipes 6 and 19, and the circulation.

At the time of cooling, the circuits 42 and 43 leading to the cooling towers 30 on both sides of the drawing are made to function, but detailed description thereof is omitted.

Next, a chilled water circulation system for cooling in winter will be described. As described above, the load in the cooling in winter is small, so that only the variable air-conditioning type air conditioner 15 is operated. for that reason,
Valves 7a, 7d, 2 for the constant air flow type air conditioner 16
0 is automatically closed and the pumps 33a, 33a are not operated. Also, the circuit leading to the cooling tower 30 on the left side of the drawing is not operated. The circuit for circulating cold water to the variable air-conditioning type air conditioner 15 is the same as that for cooling in the summer.

Thus, in an air-conditioning system of an office building that requires annual cooling due to heat generated from OA equipment and the like,
By effectively utilizing the load characteristics of an office building and combining two air conditioners with different functions, the piping can be simplified, so that labor for piping work can be saved.

The present invention can be variously modified without departing from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

[0024]

According to the present invention, there are provided two systems: a variable air flow system air conditioner incorporating a chilled water coil and a constant air flow system cooling and heating air system incorporating a cold and hot water combined coil. A simple and rational air-conditioning system can be constructed by effectively using the load characteristics of the office by connecting and combining the above pipes. And the piping from each air conditioner can be reduced by half compared with the conventional example, and the cost required for piping and the piping work are reduced. In addition, as the piping is reduced by half, the complicated automatic control system such as valves can be simplified, the piping space in the office building can be reduced, and work such as maintenance and inspection can be facilitated.

Therefore, the present invention has a remarkable effect, such as contributing to a reduction in construction costs by greatly shortening the construction period.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is an explanatory view of a main part of an air conditioning system.

FIG. 2 is a piping system diagram when the air conditioning system of FIG. 1 is installed in an office building.

FIG. 3 is an explanatory diagram of a conventional air conditioning system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Office 3 Chilled water coil 5 Outgoing pipe of chilled water 6 Return pipe of chilled water 15 Air conditioner for cooling of variable air flow system 16 Air conditioner for both cooling and heating of constant air volume system 17 Coil for both cold water and hot water 18 Forward for both cold water and hot water Pipe 19 Return pipe for both cold and hot water

Claims (1)

[Claims] 1. A large number of devices that generate heat are arranged, and
In an office air-conditioning system with a floor area that requires at least two air conditioners, a variable air-conditioning cooling air-conditioner incorporating a cold water coil and a constant air-conditioning cooling and heating incorporating a cold / hot water coil are incorporated. In combination with a combined air conditioner, an outgoing pipe and a return pipe of chilled water are respectively piped to the cooling air conditioner of the variable air volume system, and chilled water and An office characterized in that an outgoing pipe and a return pipe for both hot water and a return pipe are respectively piped, and at the time of cooling, cold water is sent to the cold / hot water combined coil, and at the time of heating, hot water is sent to alternately switch between cooling and heating. Building air conditioning system.