JPH0444984Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention is to install multiple indoor units distributed in the same air-conditioned room, and to control the operation of these indoor units according to the load. Relating to an air conditioner that performs selectively.

(Prior art) Generally, when air conditioning a building or a train, multiple indoor units are distributed within the same air-conditioned room and these indoor units are operated selectively according to the load. An air conditioner, a so-called distributed air conditioner, is used.

That is, as shown in FIG. 8, a plurality of indoor units 1, 2, and 3 are distributed and installed on the ceiling surface 5 of the air-conditioned room 4, and the operation of these indoor units is controlled by the load, that is, the temperature inside the air-conditioned room 4. For example, in the weak cooling mode, control is performed to selectively operate the indoor units 1 and 3 and the indoor unit 2.

(Problem that the invention aims to solve) However, when one indoor unit is turned on and the other indoor unit is turned off, the perceived temperature suddenly increases for people who are near the indoor unit that is turned off. The airflow that hits your body suddenly weakens, making you feel sick and uncomfortable. Furthermore, if the operating time of an indoor unit in the vicinity of an indoor unit that is turned on is too long, the sensible temperature will drop significantly and the unit will become too cold.

This idea was created in view of the above circumstances, and its purpose is to prevent sudden changes in the sensible temperature, and to obtain the optimal airflow speed that matches the sensible temperature. Our objective is to provide an air conditioner that can significantly improve comfort.

[Structure of the invention] (Means for solving the problem) This invention provides multiple indoor units distributed in the same air-conditioned room and selectively operates these indoor units according to the load. In an air conditioner, there are a plurality of outlet air temperature sensors that detect the outlet air temperature of each indoor unit, a means for continuing the operation of a fan of an indoor unit that has been turned off, and an air outlet that corresponds to the air flow rate of the fan and when it is turned off. A means for controlling according to the temperature detected by an air temperature sensor and a means for reducing the amount of air blown by a fan of an indoor unit that is turned on when the load becomes small and the operation time continues for a predetermined time are provided.

(Function) Continues to operate the fan of the indoor unit that has been turned off. Then, the amount of air blown by the fan and the turning off of the fan are controlled according to the temperature detected by the corresponding blowing air temperature sensor. Further, the amount of air blown by the fan of the indoor unit that is turned on is reduced when the load becomes small and the time that the indoor unit is turned on continues for a predetermined period of time.

(Example) An example of this invention will be described below with reference to the drawings. However, in the drawings, the same parts as in FIG. 8 are given the same reference numerals.

As shown in Figure 1, multiple indoor units 1
0, 20, and 30 are distributed and provided on the ceiling surface 5 of the air-conditioned room 4. The indoor unit 10 includes an indoor heat exchanger 1
1. An electromagnetic on-off valve 12 that controls the inflow of refrigerant into the indoor heat exchanger 11; a fan 13 that circulates the air in the air-conditioned room 4 through the indoor heat exchanger 11;
An inverter circuit 14 that supplies drive power to the drive motor of the fan 13, a blowout air temperature sensor 15 that detects the temperature of the air blown out from the fan 13, opening/closing control of the electromagnetic on-off valve 12, output frequency control of the inverter circuit 14, blowout air It consists of a controller 16 that takes in the temperature detected by the temperature sensor 15. Note that the indoor units 20 and 30 also have a similar configuration.

Thus, each indoor unit is connected to the outdoor unit 40.
Connect to. This outdoor unit 40 has compressors 41, 42, 43 and an outdoor heat exchanger (not shown) corresponding to each indoor unit. Also, an indoor temperature sensor 51 is installed at any location within the air-conditioned room 4,
52 is provided.

FIG. 2 shows the control circuit.

60 is a main control section consisting of a microcomputer and its peripheral circuits, and this main control section 60 is connected to the controllers 16, 26, 36 and the outdoor unit 4.
0, the indoor temperature sensors 51 and 52, and the operation unit 70 are connected.

Next, the operation of the above configuration will be explained with reference to FIGS. 3, 4, and 5.

The weak cooling mode is set using the operation unit 70, and the operation is started. Then, the main control unit 60
Operation of indoor units 10 and 30 and indoor unit 2
0 operation is selectively executed. That is, when the indoor temperature (the average value of the temperatures detected by the indoor temperature sensors 51 and 52) is high, the compressors 41 and 43 are turned on to perform the cooling operation of the indoor units 10 and 30, and the indoor unit 20 is cooled. Driving will be suspended. Then, when the indoor temperature falls, the compressors 41 and 43 are turned off to suspend cooling operation in the indoor units 10 and 30, and the compressor 42 is turned on to cause the indoor unit 20 to perform cooling operation.

On the other hand, the main control section 60 controls the controllers 16 and 2.
6 and 36, the following airflow amount control is performed.

When the operation of the compressor 42 is turned off, the operation of the fan 23 is continued at the same time. In this case, the output frequency of the inverter circuit 24 is first set to the highest frequency (for example, 75 Hz), and the fan 23 is operated at the maximum air flow rate (50 m ³ /min). Then, the blowing air temperature T ₀ when the compressor 42 is on,
and with inlet air temperature (room temperature) T ₄
Calculate PMV (Predicted mean vote),
The amount of air blown by the fan 23 is controlled according to a pattern based on the calculated value.

That is, when the temperature detected by the blowing air temperature sensor 25 is below T ₁ [=1/2 (T ₀ +T ₄ )], that is, in the region where the change in blowing air temperature (dT/dt) is the largest, the maximum temperature of the fan 23 is Operate at air flow rate (50m ³ /min). When the temperature detected by the blowing air temperature sensor 25 reaches between T ₁ and T ₂ [=1/2 (T ₁ + T ₄ )],
Lower the air flow rate of fan 23 to 40m ³ /min. The temperature detected by the blowing air temperature sensor 25 is T ₂ and T ₃ [=1/2
(T ₂ +T ₄ )], the air flow rate of the fan 23 is set to the rated value of 30 m ³ /min. Then, when the temperature detected by the blowing air temperature sensor 25 exceeds _T3 , the operation of the fan 23 is stopped.

Note that the same air flow rate control is performed even when the compressors 41 and 43 are turned off.

In this way, when the operation of an indoor unit stops, the fan of that indoor unit continues to operate.
Since its operation and air flow rate are controlled according to the temperature detected by the outlet air temperature sensor, it is possible to prevent a sudden rise in the sensible temperature, and to obtain the optimal air flow velocity that matches the sensible temperature. .
Therefore, it is possible to avoid the unpleasant feeling of discomfort, and the comfort can be greatly improved.

Further, assuming that the indoor temperature is Ta and the indoor set temperature is Ts, the main control section 60 performs the control shown in FIGS. 6 and 7 when turning on the compressor.

When the compressor is turned on, the fan is set to the rated air flow rate of 30
Operate at m ³ /min. However, the indoor temperature Ta is Ts
When it becomes lower than +α (the load becomes smaller) and the compressor operation time continues for a predetermined period of time, for example, 10 minutes, the air flow rate of the fan is reduced to 20 m ³ /
Reduce to min. (α is, for example, 0.5℃).

In this way, when the cooling operation continues for a long time, the amount of air blown is reduced, so that excessive cooling can be prevented and the indoor temperature Ta can be stabilized. This not only leads to improved comfort but also improved energy saving effects.

In the above embodiment, the case where there are three indoor units has been described as an example, but the number is not limited. Furthermore, although the compressors corresponding to each indoor unit are collectively provided in the outdoor unit, it is also possible to provide the compressors for each indoor unit in the same manner. In addition, this invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist.

[Effects of the invention] As described above, this invention makes it possible to prevent sudden changes in perceived temperature, and to obtain the optimal airflow speed for the body, making it possible to significantly improve comfort. We can provide air conditioners that

[Brief explanation of the drawing]

Fig. 1 is a diagram schematically showing the overall configuration of an embodiment of this invention, Fig. 2 is a diagram showing the configuration of a control circuit in the embodiment, and Fig. 3 explains the operation of the embodiment. FIG. 4 is a flowchart for explaining the operation of the same embodiment, and FIG. 5 is a time chart for explaining the operation of the same embodiment.
The figure is a diagram for specifically explaining the relationship between the blowing air temperature and the amount of air blown in the same embodiment, FIG. 6 is a flowchart for explaining another operation of the same embodiment, and FIG. Time chart corresponding to the figure,
FIG. 8 is a diagram showing a schematic configuration of a conventional air conditioner. 4... Air-conditioned room, 10, 20, 30... Indoor unit, 13, 23, 33... Fan, 15, 2
5, 35...Blowout air temperature sensor, 16, 26,
36...controller, 40...outdoor unit,
41, 42, 43... Compressor, 51, 52... Indoor temperature sensor, 60... Main control unit.

Claims (1)

[Scope of utility model registration request] In an air conditioner in which multiple indoor units are distributed within the same air conditioned room and these indoor units are selectively operated according to the load, multiple air outlet systems are used to detect the temperature of the outlet air from each indoor unit. A temperature sensor, a means for continuing operation of a fan of an indoor unit that has been turned off, a means for controlling the air flow rate of the fan and turning off the fan according to a temperature detected by a corresponding outlet air temperature sensor, and a means for continuing the operation of a fan of an indoor unit that has been turned on. An air conditioner comprising means for reducing the amount of air blown by the fan when the load becomes small and the operation ON time continues for a predetermined period of time.