JP2753052B2 - Duct air conditioner capacity control method - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial application field) In the present invention, a plurality of air outlets provided to face a plurality of air-conditioned parts and an air conditioner main body are connected via a duct. The present invention relates to a duct-type air conditioner that communicates with the air outlet, and a damper is provided in each of the air outlets to vary the amount of air to be blown out, thereby achieving optimal air conditioning for a part to be air-conditioned. The invention relates to a capacity control method for determining the operating frequency of a deformable compressor.

(Prior Art) For example, a duct type air conditioner as shown in FIG. 5 is used. Reference numeral 1 denotes an outdoor unit accommodating a compressor and an outdoor heat exchanger of a variable operating frequency (not shown), and 2 denotes an indoor unit embedded in a ceiling, for example, for accommodating an indoor heat exchanger and a blower (not shown). The outdoor unit 1 and the indoor unit 2 communicate with each other via a refrigerant pipe 3 to form an air conditioner main body 4. A duct 5 is connected to the heat exchange air outlet side of the indoor unit 2, and a plurality of outlets 6 are connected to the duct 5. The outlet body 6 ...
Are provided apart from each other, for example, in the ceiling of a plurality of different rooms or in the ceiling of a saloon, and their open ends face the interior of the room or the saloon. A damper 7 is rotatably accommodated in each of the outlets 6 and is mechanically connected to an opening adjustment mechanism 9 so that the opening can be adjusted. That is, the amount of heat exchange air blown out from the outlets 6 to the air-conditioned part varies depending on the opening degree of the damper 7, so that air conditioning for the air-conditioned part can be adjusted. Reference numeral 8 denotes a main control circuit composed of a microcomputer or the like, which is electrically connected to the variable operating frequency compressor housed in the outdoor unit 1 and electrically connected to the opening adjustment mechanisms 9. The main control circuit 8 is electrically connected to the room temperature setting remote controllers 10 attached to the respective air-conditioned parts via the opening degree adjusting mechanisms 9. On the other hand, the duct 5
A temperature sensor 12 is arranged on the outlet side of the indoor unit 2 inside, and detects the temperature of heat exchange air blown out of the duct 5 and sends a detection signal to the main control circuit 8.

The air conditioner main body 4 performs a refrigeration cycle operation and drives a blower housed in the indoor unit 2 so that the heat exchange air generated in the indoor unit 2 is sent to the duct 5, from which each air is blown out. The air is blown out to the air-conditioned part through the mouth 6. That is, the air conditioning operation is performed on the air-conditioned portion.

In each air-conditioned part, the room temperature is set for each remote controller 11..., And the actual room temperature is detected and sent to the main control circuit 8. Here, the respective temperatures are compared and calculated, whereby the opening of the dampers 7 is determined and a drive signal is sent to each of the opening adjusting mechanisms 9. Therefore, the amount of heat exchange air in accordance with the opening of the dampers 7 is blown out from the outlet bodies 6 to the air-conditioned portion, and air conditioning adapted to the set temperature is performed.

The temperature sensor 12 in the duct 5 detects the temperature of the heat exchange air derived from the indoor unit 2 and sends the signal to the main control circuit 8. The main control circuit 8 sets the amount of air blown by the blower arranged in the indoor unit 2 and the operating frequency of the compressor arranged in the outdoor unit 1 based on the detection signal.

(Problems to be Solved by the Invention) The configuration and operation control method of such an air conditioner are as follows.
For example, it is basically the same as that disclosed in Japanese Patent Application Laid-Open No. 62-84244, but controls the degree of opening of the damper at each air-conditioned part, controls the amount of air blown to the blower of the air conditioner body, and controls the amount of air blown to the compressor. There is a problem that the operation frequency control is not unified.

Further, as one type of capacity control method, which is operation frequency control for a compressor, there is a method of assigning capacity control points. That is, a point for capacity control is assigned based on the difference between the set temperature and the room temperature in each air-conditioned portion. For example, in the case of the heating operation, as shown in FIG. 6, 0 to a maximum of 5 points are determined, and the operating frequency of the compressor for each point is set. Here at least 30HZ
Therefore, there are five stages: 50, 70, 90 and a maximum of 120 Hz. Then, the operating frequency of the compressor is set based on the points set in the air-conditioned portion, and a lean refrigeration cycle operating efficiency for performing optimal capacity control for the air-conditioned portion is obtained.

However, with such operation control, when the loads are extremely unbalanced in a plurality of air-conditioned parts, the operation is performed according to the maximum load, and the operation becomes heavy. For example, even if there are four air-conditioned parts, only one of them requires 5 points that require maximum operation, and the other 3 points are all 0 points that do not require air conditioning. The maximum commanded point is 5 points, and the operation is performed at 120 Hz. The damper 7 at the part to be air-conditioned that requires maximum operation is fully opened, and the damper at the part to be air-conditioned that does not require air conditioning is adjusted to the fully closed state. As a result, even if the operation is performed on only one of the air-conditioned parts out of a plurality of places, the compressor operates at the maximum frequency, and the more inefficient the operation becomes, the more the number of air-conditioned parts increases. Become.

The present invention has been made in view of the above circumstances,
Change the damper opening setting to the assigned point,
It is an object of the present invention to provide a method of controlling the capacity of a duct-type compressor that sets an operating frequency of a compressor adapted to the number of air-conditioned parts and the load of each air-conditioned part.

[Structure of the Invention] (Means for Solving the Problems) The present invention relates to the air conditioner including a plurality of air outlets provided to face a plurality of air-conditioned portions and a compressor having a variable operating frequency. In a duct type air conditioner which communicates with a main body by a duct, and a damper is provided in each of the outlet ports to vary the amount of air blown out from the outlet port to air-condition the air-conditioned part, the operating frequency of the compressor is Means for setting a capacity control point P to be assigned as the degree of opening of a damper facing each air-conditioned part in accordance with the magnitude of the required air-conditioning load for each air-conditioned part; The ratio of the sum of the capacity control points P in each air-conditioned portion to the value obtained by multiplying the maximum value by the number n of the air-conditioned portions is obtained, and the obtained ratio is converted into the predetermined operating frequency of the compressor. A capacity control method of a duct type air conditioner characterized by comprising a means for setting the operation frequency determination point of the compressor corresponding compared against the data.

(Operation) A capacity control point P assigned as an opening of a damper facing each air-conditioned part is set according to the magnitude of a required air-conditioning load for each air-conditioned part, and the maximum of each assigned capacity control point P is set. The ratio of the sum of the capacity control points P in each air-conditioned part to the value obtained by multiplying the value by the number n of the air-conditioned parts is determined, and the obtained ratio is compared with predetermined data of the operating frequency of the compressor and compared. Set the operating frequency determination point of the corresponding compressor.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The configuration of a duct type air conditioner may be the same as that shown in FIG. Therefore, a new description will be omitted. The capacity control method for the variable operating frequency compressor is performed as described below.

That is, the operating frequency of the compressor is P _HZ : Point for determining the operating frequency of the compressor P: Point for capacity control assigned as the opening of the damper facing each part to be air-conditioned n: Number of parts to be air-conditioned P _max : Maximum among the points for capacity control to be _allocated Value Determined from the above equation.

In the case of the heating operation, a capacity control point P is set for the difference between the set temperature and the detected room temperature as shown in FIG. For example, the capacity control point is set to 0 when the difference between the set temperature and the detected room temperature at the air-conditioned portion is 0, when the room temperature is 1 ° C. higher than the set temperature, and when 2 ° C. is higher than the set temperature. Conversely, if the detected room temperature is lower than the set temperature by 0 to -1 ° C, the capacity control point is set to one.
If the temperature is lower by -1 to -2C, the point is 2, -2 to -3C.
At point 3, at -3 to -4 ° C point 4, at -4 ° C
If the difference is more than the above, all points are point 5.

FIG. 2 shows an operating frequency determining point P _{HZ of the} compressor obtained from the capacity control point P and an actual operating frequency corresponding thereto. The operation frequency is set to five stages of 30, 50, 70, 90, and 120 Hz as in the conventional case.

More specifically, for example, there are four locations to be air-conditioned from room A to room D, and the respective capacity control points P are designated as room A-5, room B-3, and room C-2. , When assigned to room D-1, From FIG. 2, the operating frequency of the compressor is 70 Hz. That is, the compressor does not need to have the maximum operating frequency, even though the room A has the maximum 5 points, and efficient operation is possible.

When such an operation is continued, the temperature of each air-conditioned portion rises, and the capacity control point P changes. The main control circuit 8 always performs the calculation based on the above equation, and sets the operating frequency determination point _PHZ of the compressor. When the temperatures of all the air-conditioned parts finally reach the set temperature T _S and the sum ΔP of the performance control points P becomes 0, the remote controller 11
... turns off the thermo. And the room temperature drops again.
When P = 0, the above-mentioned operation frequency control is performed together with the refrigeration cycle operation.

In the case of the cooling operation, a point P for capacity control as shown in FIG. 3 is _{allocated, and} an operation frequency for the operation frequency determination point P _HZ of the compressor obtained from the above equation is set. The cooling operation can be assigned more than the heating operation, and the operating frequency is reduced accordingly. In any operation, if the number of air-conditioned parts increases or decreases,
What is necessary is just to apply this number to the above equation and perform the calculation again, so that an optimal capacity according to the number of air-conditioned parts and the load can be obtained. That is, the main control circuit 8 determines, for the operating frequency of the compressor, a capacity control point P assigned as an opening degree of a damper facing each air-conditioned portion in accordance with the required air-conditioning load for each air-conditioned portion. And a ratio of the sum of the capability control points P in each air-conditioned part to a value obtained by multiplying the maximum value of each allocated capacity control point P by the number n of the air-conditioned parts, and calculating the obtained ratio. Means for comparing and collating with data of a predetermined operating frequency of the compressor and setting a corresponding operating frequency determination point of the compressor.

[Effects of the Invention] As described above, according to the present invention, in a duct type air conditioner, the number of air-conditioned parts requiring a refrigeration cycle operation and the load state of each air-conditioned part are optimized for the compressor. Thus, the control is performed so that the operation is always performed in the optimum capacity state, and the operation efficiency can be improved.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is an allocation diagram of capacity control points for a difference between a set temperature and a room temperature in a heating operation, and FIG. 2 is a diagram for determining an operating frequency of the compressor. Actual operation frequency determination diagram for points
FIG. 3 is an allocation diagram of capacity control points for a difference between a set temperature and a room temperature in a cooling operation, FIG. 4 is an actual operation frequency determination diagram for an operation frequency determination point of the compressor, and FIG. Schematic configuration diagram of harmonic machine, 6th
FIG. 1 is a diagram showing an actual operation frequency determination for an operation frequency determination point of a compressor according to a conventional example of the present invention. 4 ... air conditioner main body, 6 ... outlet body, 5 ... duct, 7 ... damper.

Claims (1)

(57) [Claims] 1. An air conditioner main body having a compressor of a variable operating frequency type, a plurality of air outlets provided to face a plurality of air-conditioned parts, and the air outlets and the air conditioner main body. A duct type air conditioner comprising: a duct communicating with the air outlet; and a damper provided in the outlet body for varying the amount of air blown to air-condition the air-conditioned part. Means for setting a capacity control point P to be assigned as an opening degree of a damper facing each air-conditioned part in accordance with the magnitude of the required air-conditioning load on the part; The ratio of the sum of the performance control points P in each air-conditioned part to the value multiplied by the number n of parts is obtained, and the obtained ratio is compared with the data of the predetermined operating frequency of the compressor. Capacity control method of a duct type air conditioner characterized by comprising a means for setting the operation frequency determination points corresponding compressor by matching.