JP2563549B2 - Air conditioner operation control method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control method for an air conditioner, which performs capacity control for maintaining a constant blowout temperature.

2. Description of the Related Art One embodiment of a conventional air conditioner that performs constant blowout temperature control will be described with reference to the drawings.

FIG. 3 is a schematic view showing the configuration of a conventional air conditioner, in which 1 is an indoor unit main body, inside of which an indoor heat exchanger 2, an indoor blower 3, and an air temperature blown out by the indoor blower 3 are shown. It has an outlet temperature detector 4 for detecting. Reference numeral 5 denotes an outdoor unit body, which has a variable capacity compressor 6, an outdoor heat exchanger 7,
It has an outdoor blower 8 and a compressor controller 9 for controlling the capacity of the compressor 6.

A duct 11 is connected from the indoor unit body 1 to the air-conditioned room 10 to guide hot air or cold air to the air-conditioned room 10. A variable air volume unit 12 is provided in the middle of the duct 11 to change the passing air volume to control the room temperature of the air-conditioned room 10. A return duct 13 guides air from the air-conditioned room 10 to the indoor unit body 1. 14 is an air supply duct, 15 is an exhaust duct, both the air supply duct 14 and the exhaust duct 15 have fans 14 ', 15' in the middle of the duct, and exhaust a part of the air in the return duct 13, The air-conditioned room 10 is ventilated by supplying outside air.

16 is a flow rate controller of the variable air volume unit 12, detected by the set room temperature T ₀ and room temperature detector 19 which is set at room temperature setter 18 provided in the room regulator 17 of the air conditioning chamber 10 room temperature
The amount of ventilation air in the duct 11 is controlled by the difference from T ₁ .

 Next, the operation will be described.

The difference between the set room temperature T ₀ set by the room temperature setter 18 in the room temperature adjuster 17 and the room temperature T ₁ detected by the room temperature detector 19,
When T ₁ −T ₀ > 0 during cooling, the air volume control unit 16 controls the variable air volume unit so that the air volume in the duct 11 increases. And vice versa
When T ₁ −T ₀ <0, control is performed to reduce the air volume in the duct 11. At this time, in order to secure the ventilation air volume, the variable air volume unit does not make the passing air volume in the duct 11 below the preset air volume at the minimum. Although the amount of ventilation air in the duct 11 changes in this way, the compressor control is performed so that the blowout temperature detected by the blowout temperature detector 4 in the indoor unit body 1 reaches a preset temperature t _0. The device 9 changes the capacity of the compressor 6.

If the time compression force becomes the first predetermined capacity Q ₁ or less, the blowing setting temperature t ₀ of the air temperature in the cooling time of the predetermined markup t ₁ (t _1> t _0), the heating time of a predetermined price cuts t ₁ (T ₁ <t ₀ ) Change. By changing the outlet set temperature t ₀ , the air-conditioned room 10
When the air conditioning load of is reduced, the supply air volume is minimum (ventilation air volume)
Even when it becomes impossible to reduce the supply air volume, the air conditioner blowout air temperature is raised by a predetermined value and the heating air blowout air temperature is lowered by a predetermined value, reducing the capacity of the air conditioner and supporting a low air conditioning load. can do.

In addition, the air conditioning load of the air-conditioned room 10 increases and the compression function becomes Q ₂ ≧
When the second predetermined capacity of Q _{1 is} increased, the set temperature of the blown air temperature is returned to t ₀ to cope with a high air conditioning load.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, the set temperature t ₁ of the blown air temperature when the air conditioning load is low to the set temperature when the normal air conditioning load is set.
To return to t _0, since when the air conditioning load is increasing supply air volume to be air-conditioned chamber also increased and returned in this state the supply air to t _0, the state in which the air conditioning function force is increased from the air conditioning load It continues until the supply air volume decreases to the proper air volume.
In other words, there is a problem that when the set temperature of the blown air temperature is returned from t ₁ to t ₀ , a situation that impairs the comfort of the indoor environment, such as the room temperature of the air-conditioned room being too cold during cooling and too warm during heating, occurs. Was there.

In view of the above problems, the present invention provides an air conditioner that prevents a temporary overcooling or overheating of an air-conditioned room and maintains a comfortable indoor environment when returning the set temperature of the blown air temperature from t ₁ to t _0. It is provided.

Means for Solving the Problems Therefore, the present invention, in the compressor controller, the blown air temperature detected by the blowout temperature detector, the capacity variable type compressor of the preset temperature t ₀ In addition to the conventional technique of performing capacity control and increasing the capacity of the variable capacity type compression function force to the first predetermined capacity Q ₁ or less, the preset temperature of the blown air temperature is increased by a predetermined value during cooling operation and decreased by a predetermined value during heating operation. , If the compression function force decreases to the first predetermined capacity Q ₁ or less and then increases to the second predetermined capacity Q ₂ where Q ₁ ≦ Q ₂ , the compression function force becomes the second predetermined capacity Q ₂ <Q ₃ With the capacity Q ₃ , the operation is performed without performing capacity control until the blown air temperature detected by the blowout temperature detector reaches a preset temperature t ₀ .

With the above configuration, when returning from the set temperature t ₁ of the blown air temperature under low air conditioning load to the set temperature t _{0 under} normal air conditioning load,
It will be gradually returned, and the air conditioning function will not increase excessively with respect to the air conditioning load.Therefore, neither excessive cooling during cooling nor excessive heating during heating will occur, and the comfort of the indoor environment will be impaired. There is no.

Embodiment An embodiment of the present invention will be described with reference to the drawings. The same numbers are given to the constituent factors of the conventional example, and detailed description thereof will be omitted.

FIG. 1 is a schematic diagram of the configuration of the present embodiment, in which an indoor unit main body 1 is provided with an indoor heat exchanger 2, an indoor blower 3, and an outlet temperature detector 4. Reference numeral 5 denotes an outdoor unit main body, which internally has a variable capacity compressor 6, an outdoor heat exchanger 7, an outdoor blower 8,
A compressor controller 9 is provided. The air-conditioned room 10 and the indoor unit body 1 are connected by a duct 11, and a variable air volume unit 12 is provided in the duct 11. Reference numeral 13 is a return duct, to which an air supply duct 14 and an exhaust duct 15 are connected. 14 'and 15' are the air supply duct 14 and the exhaust duct 1
It is a fan for 5. Reference numeral 16 is an air volume control unit for the variable air volume unit 12, 17 is a room temperature adjuster provided in the air-conditioned room 10, and has a room temperature setter 18 and a room temperature detector 19 inside.

 Next, the operation will be described.

The difference between the set room temperature T ₀ set by the room temperature setter 18 in the room temperature adjuster 17 and the room temperature T ₁ detected by the room temperature detector 19,
When T ₁ −T ₀ > 0 during cooling, the air volume control unit 16 controls the variable air volume unit so that the air volume in the duct 11 increases. And vice versa
When T ₁ −T ₀ <0, control is performed to reduce the air volume in the duct 11. At this time, in order to secure the ventilation air volume, the variable air volume unit does not make the passing air volume in the duct 11 below the preset air volume at the minimum. Although the amount of air passing through the duct 11 changes in this way, the compressor control is performed so that the blowout temperature detected by the blowout / temperature detector 4 in the indoor unit body 1 reaches a preset temperature t _0. The container 9 is the compressor 6
Control the ability of.

If the time compression force becomes the first predetermined capacity Q ₁ or less, the blowing setting temperature t ₀ of the air temperature in the cooling time of the predetermined markup t ₁ (t _1> t _0), the heating time of a predetermined price cuts t ₁ Change to (t ₁ <t ₀ ).

After that, when the compression function force increases to the second predetermined capacity Q ₂ where Q ₁ ≦ Q ₂ , the compression function force becomes the third predetermined capacity Q ₂ <Q _{3
At 3} , the operation is performed without changing the capacity until the blowout air temperature detected by the blowout temperature detector reaches a preset temperature t ₀ .

More specifically, the constant outlet set temperature t ₀ during the cooling operation
When 15 ℃ and when the compression force becomes 50% (Q1) or less, it is changed to 18 ° C. a constant outlet temperature setting (t _1). At this time, the maximum supply air volume to the air-conditioned room 10 is 50 m ³ / mi
n, if the minimum supply air volume (ventilation required air volume) is 20 m ³ / min, the capacity is about 40% if the constant blowout temperature remains at 15 ° C.
However, if the cooling load of the air-conditioned room 10 becomes 40% or less, the room will be overcooled, but the compressor capacity will be 50% (Q ₁ ) In case of below, if the constant blown air temperature is changed to 18 ℃, if the blown air temperature of the indoor unit is 26 ℃, it is 20 (26-18) / 5.
From 0 (26-15) = 0.29 to about 29%, minimum air volume 20 m ³ / mi
It is possible to control the capacity of the compressor while securing n. Further, also in the case of heating, the capacity control range of heating can be expanded while ensuring the minimum air volume, as in the case of cooling.

Next, the air-conditioning load of the air-conditioned room 10 increases, and the compression function is 60%.
% (Q ₂ ), keep the compression function at 70% and continue operating until the blown air temperature reaches 15 ° C. When the blown air temperature reaches 15 ° C, the compressor restarts variable capacity operation. If the blown air temperature is 18 ° C and the compression function is 60%, assuming that the sucked air temperature is 26 ° C as described above, x
(26-18) / 50 (26-15) = 0.6 x ≈ 41, the air volume is 41 m ³
/ min. If the blowout air temperature is returned to 15 ° C as in the conventional example, 41 (26-15) / 50 (26-15) ≒ 0.8
The air-conditioned room becomes over-cooled until the compressed air flow rate becomes about 80% and the supplied air volume becomes appropriate. Here, when the compression function force is fixed at 70% as in the present embodiment, 41 (26-y)
From / 50 (26-15) = 0.7 y = 16.6, the blowout temperature is 16.6 ° C, and the overcooled state is reduced compared to the conventional example. After this,
When the supply air volume becomes appropriate and the blown air temperature reaches 15 ° C,
Restart the capacity control operation of the compressor.

EFFECTS OF THE INVENTION According to the present invention as described above, while performing the constant blowout temperature control, when the compression functional force becomes equal to or less than the first predetermined capacity Q ₁ , it is possible to increase the blowout air temperature by a predetermined value and lower the heating value by a predetermined value In the air conditioner to be performed, when the compression capacity increases to the second predetermined capacity Q ₂ that Q ₂ ≧ Q ₁ , until the blown air temperature reaches the initial constant value with the third predetermined capacity Q ₃ that Q ₃ > Q ₂ . By operating the compressor, it is possible to reduce excessive cooling and excessive heating of the air-conditioned room when the blown air temperature is returned.

[Brief description of drawings]

FIG. 1 is a structural conceptual diagram of an air conditioner according to an embodiment of the present invention,
FIG. 2 is an operation flowchart of the present embodiment, FIG. 3 is a conceptual diagram of the configuration of a conventional air conditioner, and FIG. 4 is a conventional operation flowchart. 1 ... Indoor unit body, 2 ... Indoor heat exchanger, 3 ... Indoor blower, 4 ... Blowout temperature detector, 5 ... Outdoor unit body,
6 ... compressor, 7 ... outdoor heat exchanger, 8 ... outdoor blower, 9 ... compressor controller.

Claims (1)

(57) [Claims] 1. An indoor unit main body having an indoor heat exchanger and an indoor blower therein, an outdoor unit main body having a variable capacity compressor, an outdoor heat exchanger, and an outdoor blower therein; A blowout temperature detector for detecting the blowout air temperature of the machine body and a compressor controller for controlling the operation of the compressor are provided, and the compressor controller is the blowout air detected by the blowout temperature detector. When the temperature is controlled to be a preset temperature t ₀ , the capacity of the capacity-variable compressor is controlled, and the capacity-variable compression function force is reduced to a first predetermined capacity Q ₁ or less, If the set temperature of the blown air temperature is increased by a specified value during cooling operation and decreased by a specified value during heating operation, and then the compression function force is increased to a second specified capacity Q ₂ where Q ₁ ≤ Q ₂ , the compression function force is increased by Q ₂ <Q ₃ third predetermined ability Q ₃
Then, the operation control method of the air conditioner, characterized in that the operation is performed without performing the capacity control until the temperature of the blown air detected by the blowout temperature detector reaches a preset temperature t ₀ .