JPS5924907Y2 - Air conditioner with bypass duct - Google Patents

Description

[Detailed description of the invention] The present invention relates to a so-called air conditioner that performs indoor heating and cooling using the same device.In particular, a bypass duct is provided in the air conditioner section including a heat exchanger and an air purification filter, and as needed. The present invention relates to an air conditioner that can reduce ventilation power while providing the necessary amount of air conditioning and heating by increasing or decreasing the amount of air that passes through the air conditioner section.

Conventional air conditioners generally have a heat exchanger and an air purifying filter, and air is passed through the heat exchanger (generally a coil) through a cooling medium such as cold water or brine, or a heating medium such as hot water or steam. The temperature in the room is controlled by exchanging heat with the air and guiding it into the desired room as cold or warm air, but the heat exchange capacity required for cooling is generally the same as that required for heating. Because the heat exchange capacity is extremely large compared to the heat exchange capacity, the size of the heat exchanger that cools or heats the circulating air is determined according to the peak cooling time, and therefore the heat exchange capacity during heating is limited. Generally, there is a large amount of leeway.

Furthermore, the amount of heat exchange required to maintain the desired indoor temperature at a predetermined temperature changes even at the beginning and end of the season, morning and evening, day and night.

Therefore, if a heat exchanger made for peak cooling times were to ventilate the entire required amount of air, it would inevitably have the disadvantage of generating large ventilation resistance and consuming a large amount of ventilation power. be.

The present invention was made with the aim of eliminating this drawback, and its gist is to provide a duct constructed of pipes that bypasses the heat exchanger and filter with high ventilation resistance, In addition to reducing ventilation resistance as much as possible, by installing a damper on the bypass duct to control the amount of ventilation, the amount of air passing through the heat exchanger and filter is kept to the minimum necessary, and excess air is removed. By passing the air volume through the bypass duct, which has almost no ventilation resistance, the ventilation power of the variable air volume fan used for ventilation is measured to be saved, and it is possible to save the power consumption while performing the necessary amount of air conditioning and heating. That's what I did.

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment of the present invention will be described in more detail based on the drawings.

In the figure, reference numeral 1 denotes an air conditioner section which is a main part of an air conditioner for indoor heating and cooling, and an air purifying filter 2 and a heat exchange coil 3 are provided inside the air conditioner section.

This heat exchange coil 3 includes a flow controller 1 to a roll valve 1.
A hot or cold water pipe 15 having 4 is connected.

This air conditioner section 1 is provided with a bypass duct 4 that connects the air intake flow path 1a and the air discharge flow path 1b.
is provided.

The air passing through the air conditioner section 1 and the bypass duct l~
A variable air volume fan 7 such as a variable pitch axial flow fan is installed downstream of the air outflow channel 1b that mixes the air that has passed through the air flow path 1b.
is installed.

The discharge channel 1b extends into the room 8 whose temperature is to be controlled, and outlets 9, 9, . . . are provided at necessary locations.

In addition, the air discharged from the room 8 is transferred to the air conditioner section 1.
A recirculation duct 1-10 is provided to guide the air to the air suction channel 1a, and a damper 11 is provided within the recirculation duct 10 to adjust the amount of recirculated air.

In addition to the recirculation duct (10) in the air intake flow path 1a,
An air intake 012 for intake of fresh air is connected.

In addition, a thermometer T1 is installed in the duct near the air intake flow path 1a.
is provided, and controls the bypass damper 5 and the variable air volume fan 7 depending on the temperature of the return air from the duct 10 and/or the temperature of the fresh air taken in.
A controller 13 is attached.

Furthermore, a thermostat T2 is provided in the room 8 where the temperature is to be controlled, thereby controlling the operation of the flow rate control valve 14, and controlling the cold and hot water pipe 1.
It is configured such that the flow rate of 5 can be adjusted.

Now, if we explain when such a device is used for heating,
The heat exchanger coil 3 receives hot water (
or steam) and exchanges heat with the air passing through the air conditioner section 1 to produce warm air.

This hot air is blown through the duct 6 by a variable air volume fan 7 and blown out from a large number of outlets 9, 9, etc. into the room 8 whose temperature is to be controlled, thereby heating the room 8. The exhaust air from the room 8 is guided by a recirculation duct 10 to the air intake passage 1a of the air conditioner section 1, thereby completing a heating circulation passage.

Note that outside air is taken in from the fresh air intake port 12 as needed.

At this time, the temperature of the recirculating air in the air intake flow path 1a is sensed by the thermometer T1, and when this temperature is higher than a predetermined temperature, the controller 1-roller 13 instructs to increase the opening degree of the damper 5 and at the same time Control is performed such as reducing the pitch of the rotating blades of the fan 7 or reducing the number of rotations.

Here, while the ventilation volume of the bypass duct 4 increases, the ventilation volume of the air conditioner section 1 decreases, so as mentioned above, the ventilation resistance rapidly decreases, and the pressure drop becomes small, so that the ventilation of the variable air volume fan decreases. Power can be saved.

When the temperature of the thermometer T1 is lower than the predetermined temperature, the controller 13 conversely instructs to reduce the opening degree of the damper 5 and turns on the variable air volume fan in order to reduce the ventilation volume of the bypass duct 4 or make it zero. Control is performed such as increasing the pitch of the rotating blades 7 or increasing the number of rotations.

Further, the flow rate control valve 14 is controlled by a thermostat T.
Its operation is controlled by 2, and the flow rate of hot water or steam can be adjusted based on the temperature of the room 8, and together with the control of the controller 13, the temperature of the room 8 is reliably adjusted. be.

In this way, the temperature of the room 8 whose temperature should be controlled is always maintained at a predetermined temperature, and the amount of ventilation to the bypass duct is automatically increased or decreased, making it possible to save ventilation power by reducing ventilation resistance.

In other words, the heat dissipation (heat absorption) capacity of the heat exchange coil of an air conditioner is generally designed for peak load times, so the amount of heat exchange required at the beginning and end of the season, during the day, and at night is not constant; As mentioned above, there may be some margin in the heat absorption capacity, but if the required load is 1/3 of the peak, adjust the opening of the bypass damper 5 to remove the bypass. Duct 4 has 2/2 of the total airflow volume.
3 and flow 1/3 of the air through air conditioner section 1, reducing the overall heat dissipation (heat absorption) capacity to 1/3, the amount of air flowing through air conditioner section 1, which has high ventilation resistance, will be reduced. As a result, the flow velocity also decreases to 1/3, and therefore the ventilation resistance (pressure loss), which is proportional to the square of the flow velocity, is 1/3.
It suddenly decreased to /9.

At this time, by adjusting the pitch of the rotating blades of the variable pitch axial flow fan by reducing the pitch, etc., the ventilation power of the fan can be reduced by the amount of the reduction in pressure loss without changing the amount of air blown.

It goes without saying that the power consumption of the fan can be further reduced by reducing the amount of air blown by the fan, if necessary.

Furthermore, when this device is used for cooling, the principle is almost the same as for heating.

Cold water is passed through the pipe 15, and cold air is generated by the heat exchange coil 3 and sent into the room to be cooled.

When the temperature sensed by the thermometer T1 is lower than a predetermined temperature, the controller 13 instructs to increase the opening degree of the damper 5, and at the same time decreases the pitch or rotation speed of the rotating blades of the variable air volume fan 7. control.

What should be noted here is that the temperature difference between the outside air and cold water during cooling is relatively small at around 10 to 15 degrees Celsius, while the temperature difference between outside air and hot water during heating is large at around 50 to 80 degrees Celsius. Moreover, the heat exchanger for cooling has to be larger than that for heating.

In other words, the heat exchange capacity created for peak cooling times has a large margin during heating times.

Therefore, during heating, the amount of air passing through the air conditioner section 1, which has a large ventilation resistance, is minimized, and the excess air amount is transferred to the bypass duct 4.
This leads to an extremely effective saving of ventilation power, and this is where the great advantage of the present invention arises.

In the above explanation, the heat exchange coil 3 is used as the heat exchanger, but it goes without saying that a heat exchanger in other shapes such as a known honeycomb shape or a template shape may be used instead. .

As described above, various changes and improvements can be made to the present invention without departing from the spirit thereof.

Since the present invention is as described above, it reduces the ventilation resistance of the ventilation passage inside the device while performing the necessary cooling and heating.
This has the excellent effect of effectively reducing power consumption by reducing ventilation power.

[Brief explanation of drawings]

The drawing is a system diagram showing an embodiment of the present invention. 1: Air conditioner part, 1a: Air intake channel, 1b: Air discharge channel, 2: Filter, 3: Heat exchange coil, 4: Bypass duct), 5, 11: Damper, 7: Variable air volume fan, 8
: indoor, 9: outlet, 10: reflux duct, 12: air intake, 13: controller, 14: flow control valve, 15: piping, T1: thermometer, T2: thermostat.

Claims (1)

[Scope of utility model registration request] It has an air conditioner section that includes a heat exchanger and an air purification filter, and the heat-exchanged air is guided into the intended room by flowing a cooling medium or a heating medium through the heat exchanger of the air conditioner section. In the air conditioner that adjusts the indoor temperature, an air conditioner bypass duct is provided, which is composed of a pipe line that bypasses the heat exchanger and the air purifying filter, and whose ventilation resistance is reduced as much as possible. In addition, a damper is provided on the bypass duct, and by controlling the amount of ventilation by the damper, the amount of air passing through the air conditioner portion is adjusted according to the required amount of heat exchange. Air conditioner with bypass duct.