JPH0424611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention has been made in order to obtain cooling operation with high dehumidification efficiency by using a variable speed compressor.

[Prior art]

A conventional air conditioner will be explained using FIG. 1.
Reference numeral 1 denotes an evaporator, 2 an indoor fan, and 3 a dew pan, which are housed in a housing 4 and together with a front decorative cover 5 form an indoor unit. Further, 6 is a compressor, 7 is a condenser, and 8 is an outdoor fan, which are housed in a housing 9 to form an outdoor unit, and the indoor and outdoor units are connected by a refrigerant pipe 10.

When this air conditioner performs cooling operation, the indoor fan 2 and the outdoor fan 8 rotate simultaneously with the operation of the compressor 6, and indoor and outdoor air flows as shown by arrows A and B. As a result, on the indoor unit side, indoor air is cooled (sensible heat content) and condensed (latent heat content) by the evaporator 1.

If a cooling operation is performed when the indoor air is relatively low temperature and highly humid, the humidity will decrease due to the latent heat component of the cooling capacity, but the sensible heat component will cool the air and make it cold. Therefore, in such a case, in order to reduce the sensible heat content and increase the latent heat content (increase the latent heat ratio), there is a method of slowing down the rotation of the indoor fan 2 and continuing the operation of the compressor 6. be.

In addition, recently, in order to obtain cooling operation with high dehumidification efficiency using a variable speed compressor, attempts have been made to lower the rotation speed of the compressor and slow down the rotation of the indoor fan. However, when operating in this manner, even though the sensible heat content decreases, the room temperature gradually decreases and becomes colder. For this reason,
When the room temperature reaches the set temperature using the temperature controller,
Stop the compressor, and during that time also stop the indoor fan.
Prevents re-evaporation of water condensed on the evaporator surface. Then, once the room temperature rises, the compressor and indoor fan are operated again. A diagram of this operation is shown in Fig. 2, and the temperature of the indoor air and changes in temperature are shown in Fig. 3.

In this case, it takes time for the compressor to start operating and for the evaporator to cool down, and because the indoor fan is operating during that time, there is re-evaporation of water (part a).
This not only makes the occupants feel uncomfortable, but also reduces the efficiency of dehumidification as it removes a lot of moisture.

[Purpose of the invention]

The present invention has been made in an attempt to improve such drawbacks, and is intended to maintain a large latent heat ratio while eliminating the return of moisture when restarting operation.

[Summary of the invention]

In other words, when restarting operation, the speed of the compressor is rapidly increased to cool the evaporator, and then the speed of the compressor is slowed down to reduce sensible heat content, and the indoor fan is operated at low speed. It is.

[Embodiments of the invention]

An embodiment of the present invention will be explained with reference to an operational diagram shown in FIG. In order to perform cooling operation with high dehumidification efficiency, the rotation speed of the compressor is lowered and the indoor fan is also operated at a lower speed. At this time, the moisture in the air is dehumidified and the humidity becomes lower, and the room temperature gradually decreases.
When the room temperature reaches the set temperature, the compressor and indoor fan stop operating as shown in FIG. After that, when the room temperature rises and becomes higher than the set temperature, the compressor and indoor fan are normally restarted, but at the start of this restart, the rotation speed of the compressor is set to a higher speed than the rotation speed before stopping. At the same time, the indoor fan is kept in a stopped state to rapidly cool the evaporator. After that, it is detected that the evaporator has been cooled to a temperature that prevents the evaporation of dew condensed on the surface of the evaporator. After a certain period of time has elapsed, the rotation speed of the compressor is forcibly reduced and the indoor fan is operated at low speed.

When the above-mentioned temperature controller operates and restarts, the evaporator is rapidly cooled and no air is circulated to the evaporator by increasing the rotation speed of the compressor and keeping the indoor fan stopped. . This makes it possible to prevent moisture from returning to the room due to re-evaporation of dew condensed on the surface of the evaporator (see part a in FIG. 3 of the prior art). Then, since the indoor fan is operated after the indoor fan continues to be stopped, the air from the indoor fan comes into contact with the surface of the evaporator whose surface temperature has decreased, and the dew condensed on the evaporator is re-evaporated. This not only prevents moisture in the air from condensing on the evaporator surface. Therefore, it is possible to prevent an increase in indoor humidity due to re-evaporation of dew, to prevent discomfort to those in the room, and to improve dehumidification efficiency.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent an increase in indoor humidity due to re-evaporation of dew during restarting, prevent discomfort to those in the room, and increase dehumidification efficiency.

[Brief explanation of drawings]

Figure 1 is a side sectional view of a conventional air conditioner;
FIG. 3 is a diagram of the operating behavior of a conventional air conditioner, FIG. 3 is a diagram of indoor air temperature and temperature change, and FIG. 4 is a diagram of the operating behavior of the air conditioner of the present invention. 1... Evaporator, 2... Indoor fan, 6... Compressor, 7... Condenser.

Claims (1)

[Scope of Claims] 1. When the indoor fan that circulates air to the compressor and evaporator stops operating due to the operation of the temperature controller during cooling operation, and then restarts when the temperature adjustment is activated. operates the compressor at a higher speed than the rotation speed before the stop and continues the stopped state of the indoor fan, then operates the compressor at a lower speed and turns the indoor fan on. A method for controlling an air conditioner, characterized in that the air conditioner is operated at a low speed and thereafter the above operation is stopped and restarted.