KR20020075075A - Power saving air cooling method of inverter air-conditioner - Google Patents

Abstract

PURPOSE: A method for power-saving cooling of inverter air conditioner is provided to reduce power consumption by allowing a user to select power-saving step according to fluctuation of indoor temperature. CONSTITUTION: A method comprises the steps of: a first step setting gaps between indoor temperatures where a plurality of operational frequencies are varied by each of power-saving steps differently according to indoor temperature and outdoor temperature; and a second step varying a plurality of the operational frequencies of the power-saving step selected according to cooling condition which a user wants by fixed gap of indoor temperature on power-saving mode.

Description

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

The present invention relates to a power-saving cooling method of the inverter air conditioner, and more particularly, to a power-saving cooling method of the inverter air conditioner to reduce the power consumption by controlling the interval of the room temperature that varies the operating frequency during the cooling operation by the user's selection.

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 / external load, and it can respond quickly to the load by operating at a high frequency at high loads and operate at a low frequency at low loads, thereby saving energy efficiency. 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, to provide a power-saving cooling method of the inverter air conditioner to reduce the power consumption by allowing the user to select the power saving stage during the cooling operation according to the change in the room temperature. There is this.

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 for the power saving cooling method of the present invention inverter air conditioner.

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.

19 is a view showing the performance of the first power saving operation mode in which the room temperature interval '0.5 ° C.' for varying the operation frequency in the power saving cooling method of the inverter air conditioner of the present invention.

20 is a view showing the performance of the second power saving operation mode in which the indoor temperature interval '1 ° C.' for varying the operating frequency in the power saving cooling method of the inverter air conditioner of the present invention.

FIG. 21 is a view illustrating performance of a third power saving operation mode in which an indoor temperature interval '1.5 ° C.' for varying an operating frequency is performed in a power saving cooling method of an inverter air conditioner of the present invention. FIG.

FIG. 22 is a view illustrating performance of a fourth power saving operation mode in which an indoor temperature interval '2 ° C.' for varying an operating frequency is used in a power saving cooling method of an inverter air conditioner according to the present invention. FIG.

The present invention for achieving the above object is an indoor air conditioner in which the operating frequency is variable according to the temperature conditions of the outside air, the operation is variable, depending on the indoor temperature and the outdoor temperature, a plurality of operating frequencies vary in each power saving step A first step of differently setting a temperature interval; In the power saving operation mode, a plurality of operating frequencies of the power saving stage selected by the user in accordance with a desired cooling state are varied by a predetermined room temperature interval.

Hereinafter, with reference to the accompanying drawings the operation and effect of the power saving cooling 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 method of an inverter air conditioner according to the present invention. As shown in FIG. 1 course; In the power saving operation mode, the second operation is performed by varying a plurality of operating frequencies of the power saving stage selected according to a desired cooling state at predetermined room temperature intervals (0.5 ° C., 1 ° C., 1.5 ° C., 2 ° C.), Such operation of the present invention 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 as shown, 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 in 1.5 ℃ intervals.

In this case, setting the temperature range of the room temperature to vary 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 ROM table in which an operating frequency is set and stored according to a difference between an indoor temperature and a temperature set by a user.

Therefore, as a result of the experiment, since the interval of the room temperature for varying the operating frequency affects the user's sense of warmth and comfort by the reduction of power consumption and the conversion of the average temperature of the room, the driving frequency is variable in the present invention. The user selects the interval of room temperature to become more power-saving cooling.

That is, if the user wants to operate a lot more power saving while lowering the room temperature slowly compared to the existing cooling, as shown in Figure 19 performs the first power saving operation mode of the room temperature interval '0.5 ℃' for varying the operating frequency, and the existing cooling In contrast, if the user wants to save power while slowly lowering the indoor temperature, according to the user's selection of the power saving operation mode, as shown in FIG. 20, the second power saving operation mode having an indoor temperature interval of '1 ° C.' as shown in FIG. The third power saving operation mode in which the indoor temperature interval for changing the driving frequency is '1.5 ° C.' or the fourth power saving operation mode in which the indoor temperature interval for changing the operating frequency is '2 ° C.' is performed as shown in FIG. 22.

Thereafter, when the power saving mode is selected, the maximum operating frequency is set by using the interval between the indoor temperature and the indoor and outdoor temperature for varying the frequency, and the value corresponding to the difference between the desired temperature and the indoor temperature is read from the ROM table. After the final operating frequency is determined, cooling operation is performed at the final operating frequency.

In other words, in the present invention, since the interval of the room temperature at which the frequency is variable also affects the cooling and comfort of the user due to the reduction of the power consumption of the system and the change of the room average temperature, Allows the user to select the interval to set the interval of the room temperature at which the frequency varies by power saving stage.

As described in detail above, the present invention, in the cooling operation by setting the maximum frequency and the final frequency according to the indoor and outdoor temperature during the cooling operation, the user can select the power saving step according to the change of the indoor temperature to reduce the power consumption It works.

Claims (5)

In the inverter air conditioner in which the operating frequency is variable according to the temperature of the outside air, A first step of differently setting an interval between indoor temperatures at which a plurality of operating frequencies vary in each power saving step according to indoor and outdoor temperatures; If the power saving operation mode, the power saving operation method of the inverter air conditioner, characterized in that for performing a second process of varying the operation frequency of the power saving step selected according to the desired cooling state at a predetermined room temperature interval. The method of claim 1, wherein the first process includes setting a range of the maximum operating frequency according to the indoor temperature and the outdoor temperature. The method of claim 1, wherein the ratio of the outdoor temperature and the indoor temperature for calculating the operating frequency is 3: 1, 2: 1, or 1: 1. The method of claim 1, wherein the plurality of operating frequencies are 62 Hz, 58 Hz, 52 Hz, 47 Hz, 37 Hz. The inverter air conditioner according to claim 1, wherein the interval of the room temperature at which the operation frequency for each power saving step is varied is selected by the user from one of '0.5', '1', '1.5', and '2'. Power saving operation method.