JPS606464B2 - Air conditioner control method - Google Patents

Description

[Detailed Description of the Invention] The present invention incorporates a humidity sensor at the same time as a temperature sensor,
Keep the indoor conditions as close to the set temperature and humidity as possible,
The present invention relates to a method of controlling an air conditioner with the aim of efficiently achieving the desired results.

Since conventional air conditioners only had a temperature sensor, they were able to match the indoor temperature to the set value, but the indoor humidity changed depending on the situation at the time, and in some cases It was unavoidable that even if the temperature was optimal, the humidity would sometimes be too high or too low.

This is clearly a disadvantage from both comfort and energy saving points of view, and the present invention provides an air conditioner control method that can eliminate the above drawbacks. The specific content of the present invention will be explained below. Figure 1 shows the characteristics of an air conditioner during cooling operation.Of course, the cooling capacity changes depending on the capacity of the compressor. The proportion of sensible heat increases,
If it is large, the proportion of latent heat increases.

Although not shown in the figure, if this air conditioner is put into a state where it can perform a so-called dehumidifying operation, it is also possible to operate it with a cooling capacity (in this case, a dehumidifying capacity) with 100% latent heat content. FIG. 2 is a block diagram of a method for controlling an air conditioner according to the present invention.

In Fig. 2, numeral 1 is a temperature sensor that is installed in the air conditioner and can sense the room temperature 2, 3 is a humidity sensor that can sense the indoor temperature 4, temperature sensor 1 and humidity sensor 3. Set temperature 5 and set humidity 6 at that time
It is possible to know the magnitude of the temperature difference 7 and the humidity difference 8 between the two.

Furthermore, by knowing the ratio of the head heat component and the latent heat component corresponding to the temperature difference 7 and the humidity difference 8, it is basically determined whether the air conditioner is in the cooling operation 9 or the dehumidifying operation 10. In other words, if the ratio of the latent heat component determined from the temperature difference 7 and the humidity difference 8 is greater than the state in which the latent heat component ratio is maximum in FIG. 1, the dehumidification operation 10 is performed. , If the latent heat ratio calculated from the humidity difference 8 is less than the maximum value of the latent heat ratio in the first step, "cooling operation 9 is performed, and compression is performed so that it is equal to the heat dissipation ratio at that time. The capacity of the air conditioner 11 is controlled by controlling the capacity of the air conditioner 11. By knowing the ratio of sensible heat and latent heat of the cooling load at that time, the air conditioner itself controls the operation in accordance with the ratio.

This will be further explained with reference to FIG. Figure 3 shows the state of the indoor air with temperature on the horizontal axis and humidity on the vertical axis. Point P is the point that indicates the set temperature and humidity, and points A, B, and C indicate the condition. This point indicates the indoor temperature and humidity immediately before performing cooling or dehumidifying operation in different cases.

First, let us consider when the initial indoor condition is A and the cooling operation is started. In a conventional air conditioner, the sensible heat ratio in the cooling capacity is constant, so after the start, the indoor temperature and humidity change as shown by arrows A → P', and the temperature sensor detects that the temperature is the same as point P. When the temperature reaches point P', the operation is stopped, and by repeating ○N and OFF, the inside of the room is kept at point P', but it is clear that point P' is lower than the target point P'. However, the humidity is low, which means that more work is being done than necessary, which is not efficient.According to the control according to the present invention, there is a large temperature difference between points A and P.
Since the humidity difference is small, cooling operation is performed when the capacity of the compressor is relatively small, and the ratio of sensible heat is relatively large.As a result, the temperature changes as shown by arrow A → P, and from then on, By turning the operation ON/OFF, the indoor condition changes to P.
kept on point. When starting from point B, the sensible heat ratio is usually about 70%, so cooling operation is performed when the compressor capacity is relatively large, and the indoor condition changes from B to P. do. Next, when starting from point C, the ratio of latent heat is large, so the air conditioner is controlled to perform dehumidification operation, and as a result, the indoor condition changes from ○ to P and reaches point P. . As described above, according to the present invention, it is possible to control the operating state of the air conditioner according to the ratio of the latent heat component and the head heat component of the cooling load, so that the operating state of the air conditioner can be controlled in accordance with the ratio of the latent heat component and the head heat component of the cooling load. The present invention can be applied to heat pump type air conditioners as well. Needless to say.

[Brief explanation of drawings]

Figure 1 is a characteristic diagram of the air conditioner of the present invention during cooling operation; Figure 2 is a block diagram of the control method for the air conditioner of the present invention; It is a diagram showing changes in state. 1 is a temperature sensor, 2 is a room temperature, 3 is a humidity sensor, 4 is a humidity, 6 is a set temperature, 6 is a set humidity, 7 and 8 are differences, and 9 is an air conditioner. 10 is the dehumidification operation, and 11 is the capacity of the compressor. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 Equipped with a temperature sensor that can detect room temperature and a humidity sensor that can detect humidity, and by detecting the difference between the set temperature and set humidity, it is possible to calculate the ratio of sensible heat and latent heat in the cooling load. control of an air conditioner, characterized by determining whether to perform cooling operation or dehumidification operation while varying the capacity of the compressor according to the ratio, and controlling the capacity of the compressor during cooling operation. Law.