JPH0228772B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to an air conditioner in which a ventilation function is added to the function of a fan coil unit.

[Prior art]

Generally, as one of the indoor air conditioning methods for office buildings and the like, there is an air conditioning system that uses a fan coil unit. This air conditioning system includes, for example, a floor-standing fan coil unit U, as shown in Figure 2.
A fan coil unit U is installed at the edge of a window (wall) in the air-conditioned room R, and the cold water for cooling or hot water for heating produced in another room (mechanical room) in the building is supplied to this fan coil unit U.
This is an air conditioning method that performs cooling and heating by guiding the The main structure of the fan coil unit U used in this system is as shown in FIG. That is, a coil tube C is provided as a heat exchanger through which cold water or hot water passes, and a fan F is provided which blows air into the room through the coil tube C. This fan F
The fan sucks indoor air and blows it back into the room, and its function is simply to circulate the indoor air. Note that in FIG. 3, the front panel is removed to make the internal structure easier to understand.

[Problems to be solved by the invention]

In the room R that is heated and cooled by the fan coil unit U configured as described above, since the fan coil unit U itself does not have a structure to take in outside air and perform ventilation, as shown in FIG. As air conditioning equipment, in addition to the fan coil unit U, a duct system D for taking in outside air and a duct system (not shown) for discharging indoor air are required. In other words, although the fan coil unit system itself is an air conditioning system whose purpose is heating and cooling that can be locally controlled, it is a centrally managed air conditioning system for ventilation (including outside air cooling). It is generally used in conjunction with the system. Therefore, in this air conditioning system, the management systems for air conditioning in a single room are separate, such as temperature adjustment being carried out by local control and ventilation being carried out by central control, and unified management is not possible. Nakatsuta. Further, in this air conditioning system, it is necessary to install a duct system (supply/exhaust) for ventilation, an air conditioner for processing outside air, etc., and a space is also required to install these. In other words, one of the advantages of adopting a fan coil unit system is that it reduces the size of the equipment by localizing the air conditioning system, but regarding the air conditioning equipment for ventilation that is necessary for this fan coil unit system However, it was not possible to pursue its merits. Furthermore, during the intermediate period when heating and cooling are not performed,
At present, the fan coil unit U has become a completely useless piece of equipment and is installed indoors without being used. The present invention has been devised in view of the above problems and to effectively solve them. Therefore, the purpose is to incorporate the ventilation mechanism into the fan coil unit so that outside air can be taken in by an integrated unit, and when adopting an air conditioning system using the fan coil unit,
An air conditioner that can reduce the need for a centrally controlled air conditioning system for ventilation equipment and replace both heating and cooling equipment and ventilation equipment with a small locally managed air conditioning system, and that can also be used as an outside air cooling device even in the interim period. Our goal is to provide the following.

[Means to solve the problem]

An air conditioner according to the present invention includes a coil tube as a heat exchanger, and a first fan that sucks air inside a room to be air-conditioned or fresh outside air and blows the air into the room to be air-conditioned by passing through the coil tube. ing. That is, the indoor air intake path and the outside air intake path are connected to the intake side of the fan of the conventional fan coil unit so that the indoor air intake path and the outside air intake path can be switched. is configured.
Furthermore, this air conditioner is equipped with a second fan that exhausts the air in the air-conditioned room to the outside. Also,
The path for taking outside air into the first fan is
It has a first route and a second route that can be switched to each other. Further, the route for exhausting indoor air from the second fan includes a third route and a fourth route that are switchable with each other. A total heat exchanger is interposed between the second path and the third path, and each of the above-mentioned components is configured in one unit.

[Effect]

According to the air conditioner according to the present invention, when the first fan functions as an indoor air circulation fan,
Together with the coil tube, air conditioning and heating are performed in the same way as a conventional fan coil unit, and fresh outside air can be taken into the first fan as needed, for example when the CO ₂ concentration in the indoor air becomes high. Furthermore, surplus indoor air corresponding to the amount of outside air taken in is exhausted to the outside by a second fan. During heating and cooling, a total heat exchanger performs a heat exchange between the intake outside air and the exhaust indoor air, resulting in energy-saving operation. In addition, during outdoor air cooling in the intermediate period, heat exchange is not performed between the intake outside air and the discharged indoor air, and the outside air, which is lower in temperature than the indoor air, is taken in as is. Switching between these various operation modes is performed by switching the suction side path to the first fan and switching the discharge side path from the second fan.

【Example】

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIG. 1, which schematically shows a schematic configuration of an air conditioner. As shown in the figure, the embodiment of the present invention mainly consists of an indoor air conditioner section 1 and an outdoor air exchange unit section 2, which are similar to the conventional fan coil unit. To be more specific, the indoor air conditioner section 1 is provided with a coil tube 3 as a heat exchanger, and furthermore, it sucks indoor air from the air-conditioned room.
A first fan 4 is provided as an indoor air circulation fan that blows air through the coil tube 3 into the room again. In the figure, 5 is an air outlet, 6 is a suction port, 7 is a drain pan, and 8 is a filter, which are constructed almost in the same way as a conventional fan coil unit. In addition, 9 in the figure is a fifth damper (the first, second, third, and fourth dampers will be described later), and it is in an open state so that indoor air is sucked into the first fan 4 during heating and cooling in summer or winter. During outside air cooling during the intermediate period, the first
The intake side route to fan 4 is designated as indoor air intake route 1.
0 to the outside air intake path 11 (connected from the outdoor air exchange unit section 2 to the suction side path of the first fan 4). Switching from the intermediate season to the summer or winter season can be performed in the same manner by performing the reverse operation. Therefore, the first fan 4 in the intermediate period functions not as an indoor air circulation fan but as an outside air intake fan for outside air cooling. On the other hand, the outdoor air exchange unit 2 has a second exhaust fan that exhausts indoor air during outdoor air exchange.
A fan 12 and a total heat exchanger 13 for recovering heat from the exhaust air are incorporated. Furthermore, an outside air intake path 11 to the first fan 4 and an indoor air exhaust path (discharge side) 14 and (intake side) 15 from the second fan 12 are provided. The outside air intake path 11 includes a first path 16 and a second path 1.
7, and is configured such that it is possible to select which route to take in outside air from by a first damper 18 and a second damper 19 provided in each route. In addition, the indoor air exhaust path 14 is branched into a third path 20 and a fourth path 21, and a third damper 22 and a fourth damper 23 are provided on each path.
According to the configuration, it is possible to select which route the indoor air is to be discharged from. and,
The above-mentioned total heat exchanger 13 is interposed between the second path 17 and the third path 20. In addition, 2 in the figure
4 and 25 are filters, respectively. Further, as shown in the figure, this device is installed at the bottom of a window (or outside wall) facing the outside air. Furthermore, this machine has a function that detects the room temperature using a thermistor and controls the operation (rotation speed control) of the first fan 4 of the indoor air conditioner unit 1 to maintain the set room temperature, and a CO ₂ concentration sensor that detects the room temperature inside the room. The dampers 1, 2, 3, 4, and 5 are used to measure the _{CO 2 concentration} of
8, 19, 22, 23, and 9. Note that the thermistor and CO ₂ sensor may be attached to the main unit, or may be installed in the air-conditioned room separately from the main unit. As mentioned above, the first fan 4 serves both for indoor air circulation and outside air intake. Further, the second fan 12 is used exclusively for exhausting indoor air to the outside. During normal cooling operation or heating operation, only the fifth damper 9 is open and the other dampers 18, 19, 22, and 23 are all closed. In this state, the first fan 4 sucks indoor air, exchanges heat with the discharged air through the coil tube 3 (through which cold water is passed during cooling, and hot water during heating), and blows the air into the room for cooling or heating. The indoor temperature can be controlled to a set temperature by controlling the operation of the first fan 4. At this time, the second fan 12 is not operated. During cooling/heating operation (only the fifth damper 9 is open)
When the CO ₂ concentration in the air-conditioned room exceeds the set value,
The second and third dampers 1 are activated by the signal from the CO ₂ sensor.
9 and 22 are opened by adjusting their opening so that the indoor CO ₂ concentration is below the set value, and in addition to the first fan 4, the second fan 12
I also drive. In other words, the same amount of indoor air as the fresh outside air taken into the room from the second damper 19 via the second path 17 passes through the third path 20 and enters the room through the third path 20.
At this time, the indoor air and fresh outdoor air are discharged to the outside from the damper 22 of the
heat exchange occurs between the two. The total heat exchanger 13 has second and third dampers 19,
It is operated in conjunction with 22. Therefore, the fresh outside air taken into the room recovers the thermal energy of the discharged indoor air, becomes precooled or preheated, and is guided to the coil tube 3, resulting in energy-saving operation. This kind of ventilation operation is
Starting and stopping can be controlled by the set value of the CO ₂ sensor, and it is also possible to perform only starting using the CO ₂ sensor and stopping using a timer operation. No matter which control method is used, the second and third dampers 19 and 22 are automatically closed in the stopped state. During the intermediate period when heating and cooling is not performed, the flow of cold water and hot water to the coil tube 3 is stopped.
The first and fourth dampers 18 and 23 are opened, and the second and third dampers 18 and 23 are opened.
The dampers 19 and 22 are closed. Further, the fifth damper 9 is closed in conjunction with the first damper 18.
That is, the first fan 4 takes in only outside air from the first path 16 and blows it directly into the room, and the second fan 12 exhausts the same amount of indoor air from the fourth path 21 to the outside. At this time, since it is outside air cooling, there is no heat exchange between fresh outside air and indoor air.

【Effect of the invention】

As is clear from the above description, the present invention provides the following excellent effects. In other words, by incorporating the ventilation mechanism into the fan coil unit, we have made it possible to take in outside air with an integrated unit, so when adopting an air conditioning system using a fan coil unit, we can reduce the need for a centrally managed air conditioning system for ventilation equipment. Both heating and cooling equipment and ventilation equipment can be combined into a small-scale locally managed air conditioning system. Additionally, during the intermediate period, this device allows for outside air cooling operation.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the general configuration of an air conditioner according to the present invention, FIG. 2 is a schematic diagram showing the fan coil unit system according to the prior art, and FIG. 3 is a schematic diagram showing the schematic configuration of the fan coil unit according to the prior art. FIG. 3...Coil tube, 4...First fan, 9...
Fifth damper, 10... Indoor air intake path, 12...
Second fan, 13... Total heat exchanger, 16... First path, 17... Second path, 18... First damper,
19...Second damper, 20...Third path, 21...
Fourth path, 22... third damper, 23... fourth damper.

Claims (1)

[Scope of Claims] 1. A heat exchanger 3; a first fan 4 that sucks air inside the air-conditioned room or outside air and blows the air into the air-conditioned room through the coil tube 3; a second fan 12 for exhausting air to the outside; a first path 16 and a second path 17 for sucking the outside air into the first fan 4 in a switchable manner; a third path 2 for mutually switchably exhausting air from the second fan 12;
0 and the fourth path 21, and the total heat exchanger 13 interposed between the second path 17 and the third path 20 are each configured in one unit. air conditioner. 2 Said first, second, third, fourth routes 16, 17, 2
0, 21 and the indoor air path 10 taken into the first fan 4, there are first, second, and
3, 4, 5 dampers 18, 19, 22, 23, 9
The air conditioner according to claim 1, wherein the air conditioner is provided with: 3. The first, second, third, fourth, and fifth dampers 18, 1
The air conditioner according to claim 2, wherein 9, 22, 23, and 9 are switched and controlled by a signal from a sensor that detects the CO ₂ concentration of indoor air.