JPH0322549B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a ventilation system that ventilates indoor air and outdoor air, exchanges heat with each other, and further cools or heats the air introduced indoors using a heat pump refrigeration cycle. It is related to.

[Conventional technology]

FIG. 2 is a diagram showing a conventional ventilation system. In the figure, 1 is the main body, 2 is a total heat exchanger that mutually exchanges sensible heat and latent heat between indoor air and outdoor air,
3 is an exhaust fan that exhausts indoor air to the outside, and 4 is an outside air fan that introduces outdoor air into the room. 5
~8 is a duct connection port provided in the main body 1,
Connected indoors or outdoors by ducts.

In such a ventilation system, outside air fan 4
The outside air sucked in through the duct connection port 5 passes through the total heat exchanger 2, exchanges heat with indoor air, and is supplied into the room through the duct connection port 6. In addition, indoor air is sucked in through the duct connection port 7 by the exhaust fan 3, passes through the total heat exchanger 2, and is discharged outdoors through the duct connection port 8.

However, in such a configuration, the heat exchange efficiency of the total heat exchanger 2 is generally 50 to 70%, so if the temperature is 0°C outdoors and 20°C indoors, the temperature of the air blown into the room from the duct connection port 6 will vary. is 10-14
There was a drawback of low temperature.

In order to improve these points, a ventilation system can be considered that combines the above-mentioned conventional example with a heat pump air conditioner/heater as shown in FIG. In the figure, 9 is a compressor;
10 is a four-way valve, 11 is an indoor heat exchanger, 12 is an outdoor heat exchanger, 13 is a throttle device, and the four-way valve 1
0 indicates cooling operation in the case of a circuit in which the refrigerant flows in the direction shown by the solid line, and heating operation in the case of the chain line.
14 is a ventilation path A for the introduced outdoor air before being heat exchanged in the total heat exchanger 2, and 15 is a ventilation path B for the exhaust indoor air that has been heat exchanged in the heat exchanger 2. In such a configuration, assuming that the outdoor air is 0°C and the outdoor air is 20°C, the outdoor air taken in from the duct connection port 5 will have a temperature of 10 to 14°C after passing through the total heat exchanger 2, and the indoor heat exchanger 11 during heating operation will have a temperature of 10 to 14°C. In order to achieve comfortable air conditioning by heating the room to a temperature suitable for indoor heating, in other words, to ventilate indoor air and outdoor air, we supply outdoor air at the appropriate temperature to the indoor room and perform total heat exchange. The aim is to create an energy-saving ventilation system that recovers the amount of heat exchanged in the chamber.

[Problem that the invention seeks to solve]

Although the above-mentioned ventilation device offers energy saving and comfortable ventilation, the following issues need to be resolved in order to put it into practical use. In other words, since the amount of indoor air to be exhausted and the amount of outdoor air to be introduced is as follows, there is a problem in that stable operation of the refrigerant cycle cannot be realized.

In a normal refrigerant cycle, the air volume of the outdoor heat exchanger 12 is made larger than the air volume of the indoor heat exchanger 11, but due to the nature of the ventilation system, the amount of indoor air exhausted is equal to or less than the amount of outdoor air introduced. Operated by air volume.

As a result, in the above ventilation system, the outdoor heat exchanger 1
Since the amount of indoor air passing through the compressor 9 is small, it becomes easy to operate the liquid pack during heating operation, and the compressor 9
This will cause the unit to malfunction.

This invention was made to solve the above-mentioned problems, and provides a ventilation system that can ensure that the amount of air passing through the outdoor heat exchanger 12 is equal to or greater than the amount of air passing through the indoor heat exchanger. The purpose is to

[Means for solving problems]

The ventilation system according to the present invention has openings (bypass passages) in the ventilation passage for the introduced outdoor air before being heat exchanged with the total heat exchanger and the ventilation passage for the exhausted indoor air that has been heat exchanged with the total heat exchanger. It is something.

[Effect]

In this invention, part of the outdoor air is supplied through the bypass passage, and the air volume of the outdoor heat exchanger becomes the total amount of the indoor air volume and the bypassed outdoor air volume.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, numerals 1 to 15 are exactly the same as those of the conventional device described above, so a description thereof will be omitted. 16 is an air supply shutter that controls the amount of outdoor air introduced, 17 is an exhaust shutter that controls the amount of indoor air that is exhausted, 18 is an opening hole that allows a bypass passage to be provided in the ventilation path A 14 and the ventilation path B 15, and 19 is an air supply shutter that controls the amount of outdoor air introduced. This is a bypass shutter that controls the opening area of the opening hole 18.
Each shutter 16, 17, 19 is fixed to the main body 1 with a screw or the like, and the opening area can be adjusted by loosening the screw or the like.

In the ventilation system configured as described above, the amount of indoor air exhausted V _RA is
It depends on the fixed ventilation resistance of the total heat exchanger 2 and the variable ventilation resistance of the exhaust shutter 17, which is set according to the user's request. Also, the amount of outdoor air introduced
V _OA is _the amount of air supplied into the room via the total heat exchanger 2 and the indoor heat exchanger 11 and the opening hole 18
and the _fixed ventilation resistance of the indoor heat exchanger 11 and the total heat exchanger 2 and the supply air shutter 16 and It depends on the variable ventilation resistance of the bypass shutter 19.

In other words, the amount of air exhausted by exhaust fan 3 is V _EA
Then, the relationship between each air amount can be expressed by the following formula.

V _EA = V _RA + V _BA V _OA = V _SA + V _BA By the way, when using the above ventilation system, the user often uses it in conjunction with another exhaust system (for example, a toilet exhaust fan). Quantity V _RA
The relationship between V _SA and the amount of outside air supplied indoors is designed so that V _RA ≦ V _SA . It is necessary to satisfy the above air volume design conditions and to ensure that the exhaust air volume V _EA passing through the outdoor heat exchanger 12 satisfies V _EA ≧ V _SA to avoid liquid back-up operation during heating operation. There is. In such a case, the amount of outdoor air introduced V _OA
Since the distribution ratio of V _SA and V _BA is determined by the fixed ventilation resistance of the indoor heat exchanger 11 and total heat exchanger 2 and the opening/closing degree of the bypass shutter 19, V _RA
and V _SA according to the design absolute amount of air supply shutter 1
6. By adjusting the exhaust shutter 17 and bypass shutter 19, it is possible to set V _RA and V _SA and to make V _EA ≧ V _SA even under the condition of V _RA < V _SA .

Further, by providing the bypass passages in the ventilation passage A14 and the ventilation passage B15, the heat exchange effect of the total heat exchanger 2 is not impaired.

〔Effect of the invention〕

As described above, according to the present invention, a bypass passage is provided in the ventilation passage for the introduced outdoor air before being heat exchanged with the total heat exchanger and the ventilation passage for the exhaust indoor air that has been heat exchanged with the total heat exchanger. The amount of air passing through the outdoor heat exchanger can be made larger than the amount of air passing through the indoor heat exchanger, which has the effect of providing a ventilation device with stable refrigerant cycle operation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a ventilation device according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams of conventional devices. 1 is the main body, 2 is the total heat exchanger, 3 is the exhaust fan,
4 is an outside air fan, 11 is an indoor heat exchanger, 12 is an outdoor heat exchanger, 14 is an intake outside air passage, 15 is an exhaust ventilation passage, 16 is an air supply shutter, 17 is an exhaust shutter, 18 is an opening hole, 19 is a bypass shutter. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A heat exchanger that mutually exchanges heat between indoor air and outdoor air, a fan that sucks indoor air and outdoor air, respectively, and a fan that is installed in a ventilation path for the indoor air that has been heat exchanged with the heat exchanger. A heat pump refrigerant circuit component including an outdoor heat exchanger and an indoor heat exchanger installed in the ventilation path of the outdoor air that has been heat exchanged with the heat exchanger, and indoor air that has been heat exchanged with the heat exchanger. It is characterized by comprising a bypass circuit that allows a part of the outdoor air introduced between the ventilation duct and the ventilation duct for outdoor air before being heat exchanged in the heat exchanger to flow to the outdoor heat exchanger. Ventilation equipment. 2. A patent characterized by comprising an exhaust shutter that controls the amount of indoor air that is exhausted, an air supply shutter that controls the amount of outdoor air that is introduced, and a bypass shutter that controls the amount of outdoor air that flows through the bypass circuit. A ventilation device according to claim 1.