KR100378822B1 - Power saving air cooling method of inverter air-conditioner driving - Google Patents

Abstract

The present invention relates to a power-saving cooling operation method of the inverter air conditioner, and to reduce the power consumption by cooling the operation by setting the maximum operating frequency and the final operating frequency according to the indoor and outdoor temperature and the desired temperature. To this end, the present invention is an inverter air conditioner in which the operating frequency is variable according to the temperature of the outside air, the inverter air conditioner, the first step of determining the maximum operating frequency of the compressor, according to the indoor temperature and the outdoor temperature in the power saving operation mode; The final operating frequency is determined by the difference between the maximum operating frequency and the set temperature and the indoor temperature of the first process, and is performed as the second process of power saving cooling.

Description

Power saving cooling operation method of inverter air conditioner {POWER SAVING AIR COOLING METHOD OF INVERTER AIR-CONDITIONER DRIVING}

The present invention relates to a power-saving cooling operation method of the inverter air conditioner, in particular, the power-saving cooling operation method of the inverter air conditioner to reduce the power consumption by setting the maximum operating frequency and the final operating frequency according to the indoor and outdoor temperature and the desired temperature to cool the operation It is about.

In general, the refrigeration cycle apparatus, as shown in Figure 1, the working fluid, that is, the compressor (10) for compressing and converting the refrigerant to a high temperature and high pressure state, and the refrigerant in the high temperature and high pressure state compressed by the compressor 10 is Condenser 20 for discharging the latent heat to the outside while converting to, expansion means 30 for reducing the pressure by adjusting the flow rate of the refrigerant converted into the liquid phase in the condenser 20, and expansion in the expansion means 30 It comprises an evaporator 40 for absorbing the external heat while evaporating the refrigerant in the liquid state to the gas, each component is connected by a connecting pipe (50).

In the refrigeration cycle apparatus as described above, when the power is applied and the compressor 10 operates, the high-temperature, high-pressure gaseous refrigerant compressed by the compressor 10 flows into the condenser 20, and the condenser 20 flows into the condenser 20. The high-temperature, high-pressure gaseous refrigerant is converted into a liquid state while passing through the condenser 20 to a liquid state while passing through the expansion means 30 while passing through the expansion means 30. As it is lowered is introduced into the evaporator 40.

The low-temperature low-pressure liquid state refrigerant flowing into the evaporator 40 changes to a gas state while passing through the evaporator 40 to absorb external heat, and the refrigerant in the gas state evaporated from the evaporator 40 is a compressor ( 10) inhaled and compressed.

At this time, the condenser 20 and the evaporator 40 is also called a heat exchanger because the heat exchange with the outside.

On the other hand, an air conditioner (AIR-CONDITIONER; also known as an air conditioner) to keep the room in a comfortable state is equipped with the refrigeration cycle device is mounted inside the blower fan on the condenser 20 and the evaporator 40 side, respectively. The room is heated or cooled by circulating flow of heat and cold air respectively discharged from the condenser 20 and the evaporator 40.

The air conditioner includes an air conditioner in which the compressor 10 is operated at a constant frequency and an inverter air conditioner in which the compressor 10 is operated at a variable speed frequency.

The inverter air conditioner is operated while the operating frequency is changed according to the temperature condition of the outside air.

In other words, when the temperature of the outside air decreases in winter, the heating current is made at a high operating frequency by increasing the applied current value. When the temperature of the outside air is raised slightly, the heating current is lowered by lowering the applied current value. This is done.

Even in the summer, when the temperature of the outside air becomes very high, the cooling current is performed at high speed operating frequency by increasing the applied current value. When the temperature of the outside air is slightly lowered, the cooling current is applied at a low operating frequency by lowering the applied current value. This is done.

In other words, the inverter air conditioner for driving the compressor using the above-described inverter can change the operating frequency according to the indoor / outdoor load, and responds quickly to the load by operating at a high frequency at high loads, and operates at a low frequency at low loads. Operate with improved Energy Efficient Ratio (EER).

Here, the indoor load is a load until the indoor temperature is lowered to the desired temperature set by the user, and is set to operate at the maximum frequency by 'desired temperature + 2 ° C' in order to remove the indoor load in the case of cooling operation. If the user sets the desired temperature low, the inverter air conditioner is designed to operate for a long time at the maximum frequency. In this case, the inverter is operated at a higher frequency than the ON / OFF type air conditioner, so that the inverter is increased compared to the cooling capacity. The total energy consumption, including the power consumed by the circuit, is large, resulting in lower energy consumption.

In the cooling room temperature control, the operating frequency is set by the difference between the room temperature and the desired temperature, the compressor off temperature is 'desired temperature -0.5 ℃', the operating frequency is realized by Figure 2, that is, the room temperature is 'desired' If the temperature is kept above 0.5 ° C for 3 minutes, the compressor is turned off. If the room temperature is above the set temperature-1 ° C, the compressor is turned off immediately.

If the desired temperature is low, there is a problem that the power consumption is increased because it is designed to operate for a long time at the maximum frequency up to 'desired temperature + 2 ℃'.

The present invention has been made to solve the above problems, the power saving cooling operation method of the inverter air conditioner to reduce the power consumption by cooling operation by determining the maximum operating frequency and the final operating frequency according to the indoor and outdoor temperature and the desired temperature The purpose is to provide.

1 is a piping diagram showing a general refrigeration cycle device as a symbol,

2 is a diagram showing an operating frequency setting ROM table in the conventional cooling room temperature control.

Figure 3 is a flow chart of the operation of the power saving cooling operation method of the inverter air conditioner of the present invention.

Figure 4 shows the indoor and outdoor temperature conditions of the cycle experiment for deriving the present invention.

5 to 12 is a view showing a change in the cooling capacity according to the indoor and outdoor temperature and frequency changes.

Figure 13 shows the slope by the influence of the cooling capacity according to the effect of the indoor and outdoor temperature.

14 is a view showing that in order to apply the present invention, the operating frequency is changed every time the room temperature changes by 1 ℃ interval.

15 is a view showing that in order to apply the present invention, the operating frequency is changed every time the room temperature is changed by 1.5 ℃ intervals.

16 is a graph comparing the conventional cooling operation of the room average temperature when the interval of the room temperature is 1 ℃ by applying the present invention.

17 is a graph comparing the conventional cooling operation of the room average temperature when the interval between the room temperature is 1.5 ℃ by applying the present invention.

18 is a view showing a pre-stored Rom table is set the operating frequency according to the difference between the room temperature of the present invention and the temperature set by the user.

According to the present invention for achieving the above object, in the inverter air conditioner in which the operation frequency is variable according to the temperature of the outside air, in the power saving operation mode, according to the indoor temperature and the outdoor temperature, the maximum operating frequency of the compressor is determined A first process of doing; The final operation frequency is determined by the difference between the maximum operating frequency and the set temperature and the indoor temperature of the first process, characterized in that performed as a second process of power saving cooling operation.

Hereinafter, with reference to the accompanying drawings, the operation and effects of the power saving cooling operation method of the inverter air conditioner according to the present invention will be described in detail.

3 is an operation flowchart of a power saving cooling operation method of the inverter air conditioner of the present invention, as shown therein, determining whether an operation mode of the current air conditioner is a power saving operation mode; As a result of the determination of the step, operating in the normal cooling operation mode unless the power saving operation mode; Determining the maximum operating frequency of the compressor according to the indoor / outdoor temperature if the power saving operation mode is determined as the result of the step; The final operation frequency is determined by the difference between the maximum operating frequency and the set temperature and the room temperature, and the power saving and cooling operation is performed. The operation of the present invention configured as described above will be described.

First, the measurement experiments of the cooling capacity and the power consumption by the change of the indoor and outdoor temperature, which is a basic experiment for power saving, will be performed by performing cycle experiments for various frequencies at 21 converted points of indoor / outdoor temperature as shown in FIG. 5 to 12 show the experimental results for each frequency, the experimental frequency is rated 58, 52, 47, 35 Hz, the outdoor temperature is 35 ℃, the indoor temperature is 27 ℃.

As shown in the results of the experiment for each frequency of FIGS. 5 to 12, in the case of 58 Hz, in the room temperature change based on the outdoor temperature of 35 ° C. and the outdoor temperature change based on the room temperature of 27 ° C., the change in the cooling capacity of the room temperature 6 ° C. Comparing the cooling capacity of the outdoor temperature of 6 ℃, the ratio of '2.6: 1', when 52Hz, the cooling capacity of the outdoor temperature of 6 ℃ to the change of the cooling capacity of the room temperature of 6 ℃ is '' 2.1: 1 '', At 47Hz, the cooling capacity of the outdoor temperature 6 ℃ against the change of cooling capacity at room temperature 6 ℃ is '2: 1', and at 35Hz, the cooling capacity of the outdoor temperature 6 ℃ against the change in cooling capacity at 6 ℃ indoor temperature This is 1.4: 1.

Accordingly, the larger the frequency, the greater the decrease in the cooling capacity due to the decrease in the indoor temperature. It can be seen that the cooling capacity at the outdoor temperature of 6 ° C. with respect to the change in the cooling capacity at the room temperature of 6 ° C. is on average '2: 1'.

In the cycle experiment, a straight line having a slope of −1/2 is obtained by the influence of the cooling capacity according to the influence of the indoor and outdoor temperatures as shown in FIG. 13. That is, in the present invention, the cooling capacity decreases as the outdoor temperature increases and the outdoor temperature increases. As the load increases, the driving frequency is controlled to increase, and as the room temperature increases, the cooling capacity is controlled to increase the frequency because the user load increases.

FIG. 14 and FIG. 15 are conceptual views showing frequency variation according to indoor and outdoor loads showing the contents of programming the present invention. FIG. 14 is to change the operation frequency whenever the indoor temperature changes at intervals of 1 ° C., and FIG. 15 is to change the operating frequency each time the room temperature changes by 1.5 ℃ intervals.

At this time, the setting of the temperature range of the room temperature varying the operating frequency affects the user's cooling and comfort due to the reduction of power consumption of the system and the average temperature of the system. Design the power saving operation to some extent.

Here, FIG. 16 is a graph showing a result of 1.1 ° C. higher than the conventional cooling operation when the indoor temperature interval of varying the operating frequency is 1 ° C., and FIG. 17 is an interval of indoor temperature varying the operating frequency. In the case of 1.5 ℃, the average room temperature is 0.6 ℃ higher than the existing cooling operation.

Therefore, the power consumption is reduced by 13% compared to the existing cooling when the operating frequency is changed whenever the interval of the room temperature is changed by 1 ℃, and the operating frequency is changed when the interval of the room temperature is changed by 1.5 ℃ In our view, the company will reduce 8.7% compared to existing cooling.

Therefore, according to the environmental experiments of FIGS. 16 and 17, when the room temperature is changed at intervals of 1.5 DEG C, it is judged that it is proper to change the frequency because the average room temperature difference is small.

Here, FIG. 18 is a diagram showing a pre-stored ROM table in which an operating frequency is set according to a difference between an indoor temperature and a temperature set by a user, and a maximum frequency determined by an indoor / outdoor temperature condition is used for final frequency control of room temperature control. This will be described with reference to FIG.

If the current indoor temperature is 30 ° C, the outdoor temperature is 29 ° C, and the user sets the desired temperature to 27 ° C, first, in the graph of FIG. 15, the maximum frequency is determined to be 62Hz.

In addition, since the difference between the current room temperature and the desired temperature is 3 ° C., the final frequency in the ROM table of FIG. 15 is determined as the maximum frequency and is operated at 62 Hz.

If the current indoor temperature is 27 ° C, the outdoor temperature is 30 ° C, and the user sets the desired temperature to 26 ° C, in the graph of FIG. 15, the maximum frequency is determined to be 52Hz.

In addition, since the difference between the current room temperature and the desired temperature is 1 ° C., the final frequency is determined to be 37 Hz in the table of FIG. Operate one frequency below frequency.

Therefore, when the maximum frequency is set to 62 Hz by the indoor and outdoor temperature conditions, the final frequency is operated from 62 Hz to 58 Hz to 52 Hz to 47 Hz to 37 Hz according to the user's desired temperature.

In other words, the present invention determines the maximum operating frequency of the compressor in accordance with the indoor temperature and the outdoor temperature in the power saving operation mode, and then obtains the difference between the desired temperature and the indoor temperature, the final operating frequency with the difference value and the maximum operating frequency Determine and perform power saving cooling operation.

As described in detail above, the present invention is capable of saving power by setting the maximum frequency and the final frequency and cooling operation according to the indoor and outdoor temperature and the desired temperature, and setting the interval of the indoor temperature for varying the operating frequency through an environmental experiment. By maintaining the difference in average room temperature within 0.6 degrees compared to the existing cooling operation has the effect of ensuring the maximum comfort.

Claims (4)

In the inverter air conditioner in which the operating frequency is variable according to the temperature of the outside air, A first step of determining a maximum operating frequency of the compressor according to the indoor temperature and the outdoor temperature in the power saving operation mode; Power saving cooling operation method of the inverter air conditioner, characterized in that performed in the second step of the power saving cooling operation by determining the final operating frequency by the difference between the maximum operating frequency and the desired temperature of the first process and the room temperature. The method of claim 1, wherein the maximum operating frequency of the compressor is selected from one of 62 Hz, 58 Hz, 52 Hz, 47 Hz, and 37 Hz. The method of claim 1, wherein the final operating frequency is determined by reading an operating frequency according to a difference between an indoor temperature and a desired temperature from a pre-stored ROM table. The method of claim 2, wherein the difference between the room temperature and the desired temperature is divided by 0.5 degree intervals.