KR101754225B1 - Hydro carbon refrigerant blend and appratus for calculating mass ratio of the same - Google Patents

Abstract

A hydrocarbon-based refrigerant mixture of hydrocarbons and a simulation apparatus for calculating a suitable mass ratio are disclosed.
Hydrocarbon mixed refrigerant is a mixture of propane (evaporation temperature about -40 ° C at atmospheric pressure), isobutane (-10 ° C ) And butane (0 占 폚).

Description

Hydrocarbon refrigerant blend and appratus for calculating the hydrocarbon mixture refrigerant and composition ratio thereof [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant used in domestic and industrial refrigerators, and more particularly, to a hydrocarbon mixed refrigerant in which hydrocarbons are mixed and a simulation apparatus for calculating a mass ratio suitable for the refrigerant.

Conventional refrigerants are classified into single material refrigerant, azeotropic mixed refrigerant, and near azeotropic refrigerant.

   The azeotropic mixed refrigerant is a mixed refrigerant having the same dew point and bubble point, and the approximate azeotropic mixed refrigerant is a mixed refrigerant in which the difference between the dew point and the boiling point (temperature glide) is minimized.

Current mixed refrigerant or near-azeotropic mixed refrigerant is used for industrial refrigerator and heat pump, and single substance refrigerant such as new refrigerant (R134A) or isobutane (R600A) which does not have chlorine is used for domestic refrigerator.

If you look at the refrigerant circuit of a domestic refrigerator, to maintain the lowest temperature of the freezer, the refrigerant should evaporate at a temperature lower than the lowest temperature of the freezer. Also, since the temperature of the refrigerating compartment is required to maintain the image, the refrigerating compartment air is circulated through the sub-zero evaporation duct and the amount of air circulated is controlled to control the temperature of the refrigerating compartment.

The conventional refrigerant circuit normally keeps the refrigerant sucked into the compressor in an overheated steam state. Accordingly, the refrigerant gas inside the compressor becomes a superheated steam state at a higher temperature by the heat generated in the compressor and the electric motor driving the compressor.

The temperature of the refrigerant vapor sucked into the compressor varies with the ambient temperature of the evaporator and the ambient temperature of the compressor.

For example, when the ambient temperature of the evaporator and the ambient temperature of the compressor are high, the temperature of the refrigerant vapor sucked into the compressor is high, thereby increasing the degree of superheat.

On the other hand, when the ambient temperature of the evaporator and the ambient temperature of the compressor are low, the temperature of the refrigerant vapor sucked into the compressor is low, so that the superheating degree of the refrigerant vapor sucked into the compressor is low.

Therefore, the refrigerant vapor normally sucked into the compressor is in an ideal gas state that always maintains a superheat degree higher than a certain level.

1 shows the amount of refrigerant discharged from the compressor according to the temperature of the cooling chamber.

Referring to FIG. 1, when the atmospheric temperature around the compressor is high, the refrigerant vapor sucked into the compressor has a high temperature, so that the superheat degree is high, so that the mass of the refrigerant vapor compressed by the compressor is low. On the contrary, Since the temperature of the refrigerant vapor inhaled is low, the degree of superheat is low and the mass of the refrigerant vapor compressed by the compressor is high.

In the refrigerant circuit of the refrigerator, when the compressor compresses the refrigerant vapor, the refrigerant vapor compressed at a high temperature by the compressed heat condenses by discharging the heat to the atmosphere, and the condensed refrigerant absorbs the evaporation heat from the surroundings and evaporates. That is, the cooling capacity for cooling the cooling chamber is proportional to the refrigerant mass that is compressed and condensed by the compressor.

When the mass of the refrigerant evaporated due to the high atmospheric temperature is large, the mass of the refrigerant compressed by the compressor is low and the mass of the refrigerant compressed by the compressor is large when the mass of the refrigerant evaporated due to the low temperature of the air is low. .

When the compressor is required to evaporate a large amount of refrigerant due to a high ambient temperature, the compressor is rotated at high speed due to the small mass of the refrigerant discharged from one stroke of the compressor, The driving time should be long.

When the compressor stops, the refrigerant vapor temperature at the compressor inlet side changes to room temperature. That is, the compressor inlet temperature at the time of stopping the compressor is lower than the inlet temperature at the time of continuous operation for a long time, and the refrigerant pressure at the inlet of the compressor is in the state of pressure several times higher than that at the time of continuous operation of the compressor since the suction pressure and the discharge pressure are in equilibrium It changes.

That is, in the conventional refrigerator, when starting the compressor in the stopped state, the refrigerant gas temperature should be low and the pressure should be increased several times higher.

In addition, since the friction load and the inertial load of the compressor are added to each other, the starting rotational force of the compressor must have a corresponding high driving force.

That is, the starting torque of the compressor must be very large compared with the torque of normal operation after starting

.

Most of the motors that drive the compressors are AC induction motors. To increase the starting torque of AC induction motors, the resistance of the armature windings (secondary windings) is increased to minimize the current flowing through the armature windings and the phase displacement angle of the rotor system.

Thus, the resistance of the armature winding is usually larger than the armature winding resistance of the induction motor. As a result, much heat is generated due to the resistance.

In particular, since the refrigerator room temperature-15 ° C and the refrigerating compartment temperature range of 2-3 ° C must be obtained by operating a single compressor such as a domestic refrigerator, the refrigerant vapor sucked into the compressor must be a low pressure corresponding to the evaporation temperature of about -20 ° C .

Also, the amount of heat generated in the compressor driving motor in the hermetically sealed container of the compressor and the compressed heat generated by compressing the refrigerant are absorbed by the refrigerant vapor introduced into the compressor airtight container, and become the high-temperature refrigerant vapor.

Accordingly, the refrigerant vapor sucked into the compressor has a low pressure and a high temperature.

Therefore, the normal operation load ratio of the compressor drive motor of the refrigerant circuit is always operated at a low load condition of 1/5 to 1/3 of the rated load or less.

However, all power devices have the highest efficiency when the load of the device reaches the rated load, and the lower the load applied to the device, the lower the efficiency of the device.

In addition, since conventional household refrigerators use refrigerant in an azeotropic state, the temperatures at which the refrigerant evaporates in the evaporator tubes of the freezer compartment and the refrigerating compartment can not be kept different from each other

The freezer temperature is a low temperature below minus 15 ° C, and the refrigerator temperature maintains the temperature of the image.

Thus, the refrigerant vapor that adiabatically expands in the evaporator of the freezer compartment after passing through the capillary tube is a refrigerant vapor at a lower temperature.

The evaporation heat from the refrigerating chamber air should be absorbed in the refrigerating chamber evaporation duct filled with this subzero refrigerant vapor.

Thus, the amount of air circulating through the air in the refrigerating compartment to the evaporating duct is controlled by using the blower to maintain the temperature of the refrigerating compartment, so that the moisture contained in the circulating air coming into contact with the evaporator duct is freezed between the evaporator heat exchanging plates.

Since freezing prevents the flow of air, it is necessary to periodically dissolve the ice using the heat of condensation of the heater or refrigerant vapor.

The evaporator heat exchanger wastes electricity by freezing the frozen ice, and also dehydrates the refrigerated vegetables, fruits, fish, meat, etc., and freezes them at the freezing tubes and plates. Results.

BACKGROUND ART Heretofore, chlorofluorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) have been used as refrigerants in refrigerators, refrigerators, heating mediums in heat pumps, and the like. These single components, azeotropic compositions, mixtures, and the like are referred to as freon or freon. Recently, it has been pointed out that Freon, released into the atmosphere, destroys the ozone layer and has a serious adverse effect on the ecosystem including the earth. For this reason, the use and production of Freon, which are already at high risk of destruction of the ozone layer, have been regulated by international decisions.

Substances that destroy the ozone layer and cause global warming are substances that are strong in molecular bonds such as halogen element compounds and carbon dioxide gases and are not easily separated from the atmosphere.

One of the causes that are not easily separated in the atmosphere is that these materials are azeotrope mixed in an azeotropic state. Since the azeotropic mixture is not easily separated by the temperature change in the atmosphere, it forms a special gas layer to disturb the global environment.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

It is an object of the present invention to provide a non-azeotropic mixed refrigerant obtained by mixing propane (R290), isobutane (R600A) and butane (R600), which are not mixed in an azeotropic state.

Another object of the present invention is to provide a simulation apparatus for calculating a cooling heat amount according to a holding temperature of each of a freezing chamber, a refrigerating chamber, and a hermetically sealed container of a compressor, and determining a mass ratio for mixing propane, isobutane, and butane by the calculated cooling heat ratio And the like.

The mixed refrigerant according to the present invention for achieving the above-

In a mixed refrigerant provided in a refrigerant circuit having a freezing chamber, a refrigerating chamber, and a compression vessel,

(Evaporation temperature -40 ° C at atmospheric pressure), isobutane (-10 ° C) and butane (0 ° C), which are hydrocarbon substances that evaporate at different temperatures.

Here, it is preferable to calculate the amount of cooling heat according to the holding temperature of each of the freezing chamber, the refrigerating chamber, and the inside of the compressor airtight vessel, and determine the mass ratio for mixing propane, isobutane, and butane according to the calculated amount of cooling heat.

According to another aspect of the present invention, there is provided a simulation apparatus comprising:

Mixing apparatus 100 for mixing propane, isobutane, and butane to use propane isobutane butane as a refrigerant;

A compression device 500 composed of a valve, a capillary tube, a discharge valve, and a power meter connected to a peripheral device around a refrigerant compressor;

A condenser 200 for condensing and controlling the compressed refrigerant and measuring the control process,

A freezing room evaporator 300 for controlling and measuring the evaporation process of the condensed liquid refrigerant in the freezing compartment evaporation line; And

And a refrigerator compartment evaporating device (400) for controlling and measuring the evaporation process in the refrigerating compartment evaporation duct.

The non-azeotropic mixed refrigerant according to the present invention is a mixture of naturally produced hydrocarbon materials and has an eco-friendly effect that does not disturb the earth's atmosphere.

The refrigerant circuit control method according to the present invention can remarkably save the amount of power consumed compared to the conventional power consumption in the case of a household refrigerator because propane isobutane propane not mixed in an azeotropic state is mixed and used as a refrigerant, The temperature of the evaporation channel is kept at a temperature at which the moisture in the air does not freeze, so that the dehydration phenomenon does not occur in the stored vegetables and fish, and the product can be stored for a long time.

FIG. 1 is a graph showing the relationship between the amount of refrigerant discharged from the compressor and the amount of refrigerant discharged from the compressor according to the degree of superheat (temperature)
2 is a schematic view of a refrigerant circuit used as a refrigerant by applying the mixed refrigerant formed by the present invention to a domestic refrigerator
3 is a block diagram of a refrigerant circuit simulation apparatus according to the present invention.
Fig. 4 is a configuration diagram showing a detailed configuration of the condensation simulation apparatus shown in Fig. 3
5 is a view showing a detailed configuration of the freezer compartment evaporation simulation apparatus shown in FIG.
6 is a configuration diagram showing an installation state of the temperature sensor;
7 is a schematic view showing a detailed configuration of the mixing apparatus shown in FIG.
FIG. 8 is a graph showing changes in refrigerant temperature change in the conventional refrigerator and the suction pipe after evaporation of the refrigerator according to the present invention

The non-azeotropic mixed refrigerant according to the present invention is characterized by mixing natural hydrocarbon materials such as propane (R290) isobutane (R600A, i-C4H10) butane having different evaporation temperatures.

Here, propane (R290) is a natural hydrocarbon material such as isobutane (R600A, i-C4H10) butane (N-butane) which is not mixed in an azeotropic or approximate azeotropic state.

The evaporation temperature of the evaporated isobutane in the refrigerating chamber is 0 ° C and the pressure of the refrigerant is about 1.5 atm.

Further, when the vapor pressure of the refrigerant in the evaporation pipe is 1.5 atm

When the temperature of the freezing compartment is kept below -15 캜, propane in the refrigerant in the freezing compartment evaporation line evaporates at about -30 캜 to -25 캜

○ When refrigerating room temperature is maintained at 2 - 5 ℃, isobutane in refrigerant evaporates at 0 ℃ in refrigerating room evaporation duct

○ Compressor When the internal temperature of the airtight container is maintained at 15 - 20 ℃, butane in the refrigerant evaporates.

In order to maintain different temperatures in the freezer compartment, the refrigerating compartment, and the inside of the compressor airtight container, a refrigerant obtained by mixing three types of hydrocarbon materials having propane, isobutane, and butane having evaporation temperatures corresponding thereto is circulated into the refrigerant circuit .

When the temperature of the freezing chamber drops below 10 ° C according to the flow direction of the refrigerant, the evaporated refrigerant in the freezing chamber evaporates mainly propane and isobutane, and the temperature of the freezing chamber evaporates from 0 ° C When low temperature is reached, mainly propane evaporates.

On the other hand, isobutane and butane in the refrigerating chamber evaporate, and when the temperature falls below 10 ° C, isobutane is mainly evaporated.

When the refrigerating chamber temperature reaches 0 ° C, the remaining liquid propane evaporates and the temperature of the refrigerating chamber tends to drop below zero. If the refrigerating chamber temperature drops below freezing, the refrigerant compressor will stop at this time because the water contained in the stored object will freeze.

FIG. 2 is a schematic view of a refrigerant circuit used as a refrigerant by applying the mixed refrigerant formed by the present invention to a domestic refrigerator.

The refrigerant circuit shown in FIG. 2 includes a compressor 600, a condensing duct 210, a freezing compartment evaporating duct 310, and a refrigerating compartment evaporating duct 410. The condensing duct 210 shows an example applied to the air-cooled condenser.

The compressor 600 is a device for increasing the pressure by compressing the refrigerant vapor so that the refrigerant vapor evaporated in the freezing compartment evaporation duct 310 can be easily condensed. By the action of the compressor 600, the refrigerant circulates in the refrigerant circuit while repeating evaporation and condensation processes, and the heat is transferred from a low temperature to a high temperature.

The condenser 204 is for cooling and liquefying the refrigerant vapor having a high temperature and a high pressure in the compressor 600. And discharges heat in the cycle at the high-pressure side of the refrigeration cycle. That is, the refrigerant vapor condensed in the condenser 204 is deprived of latent heat of condensation around the cooling water or air. The amount of heat absorbed by the condensed refrigerant vapor through the cooling water or vapor is equal to the difference between the enthalpy of the refrigerant vapor at the inlet of the condenser 204 and the enthalpy of the refrigerant at the outlet of the condenser 204. The amount of heat is a value obtained by adding the amount of heat absorbed by the refrigerant from the low-temperature object or space in the freezing compartment evaporating duct 310 and the amount of compressed refrigerant vapor that the low-pressure refrigerant vapor has received from the compressor. The heat of condensation depends on the evaporation temperature and the condensation temperature. If the condensation temperature is high even if the evaporation temperature is the same, the amount of condensation increases and the amount of heat of condensation also increases. Also, even if the condensation temperature is the same, if the evaporation temperature is low, the volume of the refrigerant vapor sucked into the compressor increases, so that the amount of condensation increases and the amount of heat of condensation also increases.

The freezing compartment evaporation duct 310 is a device for cooling the freezing compartment, and is a device for extracting heat from a substance to be cooled or air from the surrounding, such as low-temperature and low-pressure refrigerant liquid supplied to the evaporation tube. The refrigerant liquid required for cooling in the freezing compartment evaporation duct 310 is supplied through the expansion valve, and the evaporated steam is sucked into the compressor 600. Therefore, the freezing compartment evaporation duct 310 should be constructed in a structure that has a good heat transfer coefficient and does not absorb heat into the compressor.

The expansion valve is the most basic device for controlling the refrigerant flow rate in the refrigeration cycle. The refrigerant liquid is supplied to the freezing compartment evaporation pipe 310 to lower the pressure and the temperature so that the heat absorbing action by evaporation of the liquid can be facilitated, And adjusts and supplies the appropriate refrigerant flow rate in response to the fluctuation.

In the expansion valve, if the supply of the refrigerant is insufficient, the desired evaporation temperature is not maintained and the compressor is overheated. If the refrigerant is supplied too much, the refrigerant overflows the evaporator, the liquid refrigerant is sucked into the compressor, It is difficult to drive. Therefore, the expansion valve must always be adjusted so that the freezing compartment evaporation duct 310 can exert the greatest effect

Since the doors of the freezing and freezing compartments are opened and the stored contents are drawn in and out, the temperatures of the freezing compartment and the freezing compartment are changed accordingly.

In other words, the freezer temperature is maintained at a sufficiently low temperature, so that the temperature of the freezing compartment may be lowered due to a high freezing compartment temperature. In some cases, the freezing compartment temperature may be lowered due to a high freezing compartment temperature.

According to the method of controlling the temperature of the refrigerant circuit according to the present invention, when the temperature of the freezing compartment is to be lowered, propane which functions to lower the temperature of the freezing compartment to a low temperature below zero is changed into the ambient temperature of the condensing duct 210, .

If the freezing compartment temperature needs to be lowered, the ambient temperature of the condensing duct 210 is lowered

The condensation amount of propane is increased, and when the temperature of the refrigerating compartment is to be lowered, the condensation amount of propane is decreased by raising the ambient temperature of the condensation pipe 210.

In this type of operation, the refrigerant vapor is mixed with the propane, isobutane, butane, and the lubricant that lubricates the compressor.

In this state, the hydrocarbon material not mixed in the azeotropic state in the refrigerator refrigerant circuit is selectively evaporated as described above according to the change of the ambient temperature to maintain a proper temperature in the freezing chamber, the refrigerating chamber, and the airtight container of the compressor.

In order to achieve this effect, theoretically, the amount of cooling heat according to the holding temperature of each of the freezing chamber, the refrigerating chamber, and the inside of the airtight container of the compressor is calculated and the mixing ratio of the masses of propane, isobutane, and butane is calculated, The mixture is mixed at the calculated ratio and injected into the refrigerant circuit. The compressor is operated so that the condensation temperature is changed to a maximum of 65 ° C at a temperature slightly higher than the ambient air temperature in accordance with the ambient temperature of the refrigerant circuit.

The evaporation temperature of the evaporator in the freezer compartment is -23.3 ℃ and the evaporation temperature of the evaporator in the refrigerator compartment is 0 ℃.

In this temperature range, the refrigerant vapor sucked into the compressor maintains the lowest temperature in the superheated steam state in ideal gas state, so that the compressor load ratio is kept higher than that of the conventional refrigerant circuit. Thereby, the cooling efficiency of the refrigerant circuit can be improved and the power consumption can be saved.

Also, by keeping the evaporation temperature of the refrigerating compartment evaporation tube at the image temperature and keeping the refrigerating compartment temperature at about 4 캜 of the image, the product stored in the refrigerating compartment can be stored freshly without being frozen or dehydrated.

In order to do this, propane, isobutane, and butane should be mixed and the propane should evaporate in the evaporator of the freezer compartment.

In addition, since the propane to be evaporated in the evaporator of the freezer compartment can not evaporate in the evaporator tube of the freezer compartment and evaporates in the evaporator tube of the refrigerator compartment, the temperature of the refrigerant vapor in the refrigerating compartment evaporator is lowered to zero.

For this purpose, when the condenser is cooled by the blower with the blower cooling the condenser, when the blower is operated at the highest speed, the refrigerant condensation temperature in the condensing duct is slightly higher than the ambient temperature of the condenser, The condensation temperature can be increased up to 65 ° C by the ISO rating.

When the propane is condensed in the condensing duct, the cooling blower of the condensing duct is rotated at the highest speed, so that the propane condensed at 40 ° C., which is 5 ° C. higher than the ambient temperature of 35 ° C., evaporates in the evaporator of the freezing chamber through the capillary. The temperature should be cooled to below -15 캜,

When the refrigerant temperature inside the condensing duct is controlled to 65 ° C by adjusting the speed of the cooling blower of the condensing duct, the mixing ratio of propane isobutane butane is set so that the propane does not condense in the condensing duct to flow into the freezing room evaporating duct through the capillary. and,

In a refrigerant circuit composed of a condenser, an evaporator, a cooling blower, and a temperature sensor to which the mixed refrigerant is applied, a refrigerant evaporation temperature suitable for the freezer compartment and a refrigerant evaporation temperature suitable for the refrigerating compartment are obtained to save power, Improve.

Propane Isobutane Butane In setting the mass supplied in the gaseous state, propane is set to a mass having a latent heat of vaporization corresponding to the amount of cooling heat that maintains the freezing chamber at -15 ° C,

The isobutane is set to a mass having a latent heat of evaporation corresponding to a cooling calorie that maintains the refrigerator compartment temperature at 0 DEG C, and

The most important factor in setting the mass of the butane is the propane mass in setting the mass of the latent heat of vaporization, which corresponds to the amount of cooling heat that maintains the lowest temperature in the superheated vapor state of the mixed gas in the compressor gas tight chamber.

Isobutane and butane have a higher dew point temperature than propane, so they easily condense in a mixture of propane, isobutane and butane

The amount of propane that is condensed varies with the condensation temperature.

Therefore, the amount of propane present in the liquid phase and the vapor phase in the condensing vessel 101 varies depending on the temperature inside the vessel.

At this time, when controlling the temperature of the condensing duct of the actual refrigerator circuit, when the cooling blower (710 of FIG. 2) for condensing rotates at a full speed, it is about 40 ° C which is slightly higher than the ambient temperature. It is saturated vapor pressure at 65 ℃.

The saturation vapor pressure of the refrigerant R134A used in a conventional domestic refrigerator is about 18.8 atmospheres at a temperature of 65 DEG C

Normally, the evaporation temperature is maintained at about 50 ° C, so that the compressor discharge pressure is about 15 atm.

So that the saturated vapor temperature of the mixed refrigerant is maintained at 65 ° C and the saturated vapor pressure at 15 atm.

That is, when the internal temperature of the condenser is changed between 40 ° C and 65 ° C, the amount of propane contained in the liquid refrigerant is controlled.

To this end, the ratio of the mass supplied from the gas phase of isobutane and butane to the ratio of the cooling heat amount when the refrigeration chamber is maintained at 4 ° C. and the cooling heat amount for cooling the heat generated by operation of the electric motor and the compressor in the compressor airtight container, And the ratio of the mass to the latent heat of butane.

The ratio of the amount of cooling heat can not be theoretically calculated. Therefore, it is inevitably necessary to conduct experiments with an apparatus as shown in Fig.

3 shows a configuration of a simulation apparatus according to the present invention. The apparatus shown in FIG. 3 is a simulation apparatus for calculating a ratio of the amount of cooling heat required to determine the mass ratio of the mixed refrigerant according to the present invention.

3, the simulation apparatus includes a compressor 500, a condensation simulation apparatus 200, a freezer compartment evaporation simulation apparatus 300, a refrigerator compartment evaporation simulation apparatus 400, and a mixing apparatus 100, do.

The mixing apparatus 100 is made by mixing propane, isobutane, and butane to use propane isobutane butane as a refrigerant.

The compression device 500 is composed of a valve, a capillary, a discharge valve, and a power meter connected to the peripheral device around the refrigerant compressor.

The condensation simulation apparatus 200 performs condensation control of the compressed refrigerant, simulates the condensation process by the condensation duct 210 of the refrigerant circuit, and measures the amount of condensed heat of the condensation duct 210 as an amount of electric power.

The freezing compartment evaporation simulation apparatus 300 simulates the evaporation process of the freezing compartment evaporation duct 310 of the refrigerant circuit and measures the amount of cooling heat of the freezing compartment evaporation duct 310 as the amount of electric power.

The refrigerator compartment evaporation simulation apparatus 400 simulates the evaporation process of the refrigerating compartment evaporation duct 410 of the refrigerant circuit and measures the amount of cooling heat of the refrigerating compartment evaporation duct 410 as an amount of electric power.

Fig. 4 shows a detailed configuration of the condensation simulation apparatus shown in Fig.

 4, the condensation simulation apparatus 200 is provided with a cooling duct 220 (first cooling duct) on one side of an airtight container (201, first airtight container) of a U-shaped inverted form, A condensing duct 210 for condensing the refrigerant mixed with butane butane while flowing therein, and a heat exchanger 203 (first heat exchanger) beneath the condensing duct 210 are installed.

After the noncondensable gas in the first gas tight chamber 201 is completely removed, the secondary refrigerant R123 is filled until the condensation duct 210 is sufficiently immersed.

 The secondary refrigerant R123 (202) maintains a liquid state at room temperature and normal pressure.

The refrigerant vapor flowing in the first cooling pipe 220 maintains a saturated state in order to maintain the same temperature throughout the cooling pipe 220.

To do this, the condenser 240 must be sufficiently cooler than the cooling capacity of the first cooling line 220.

When the refrigerant vapor adiabatically expanded in the constant pressure type expansion valve 204 passes through the first cooling pipe 220, the saturated vapor state maintaining the isothermal section is maintained throughout the pipe, so that the refrigerant absorbed by the first cooling pipe 220 Heat is constant because the internal refrigerant temperature is constant in all heat transfer areas.

The saturated refrigerant passing through the first cooling pipe 220 is heated by superheated steam at a predetermined temperature while being passed through the superheater 230 and sucked into the compressor.

And controls the electric power supplied to the first electric heater 203 so that the internal temperature of the first airtight container 201 is arbitrarily set and maintained.

And a first power meter (250) for measuring the power supplied to the first electric heater (203).

The amount of power applied to the first electric heater 203 to maintain the temperature of the temperature sensor T207 at a predetermined temperature in a state where the compressor 600 (see the refrigerant circuit of FIG. 2) ≪ / RTI >

The amount of change in the electric power measured by the first power meter 250 is the amount of condensed heat that dissipates the condensation heat in the condensing duct 210.

That is, when the compressor 600 (see the refrigerant circuit of FIG. 2) is operated, the condensation heat is generated in the condensing duct 210, so that the amount of electric power supplied to the electric heater 203 is reduced. This reduced amount of power is the amount of condensed heat that is emitted from the condensing duct 210.

And a plurality of temperature sensors are installed in the condensing duct 210 through which the propane isobutane butane is mixed, as shown in FIG. 5, at regular intervals along the direction of the flow of the refrigerant.

5 shows the installation state of the temperature sensor installed in the condensing duct.

A plurality of temperature sensors (TC1-N) measure the temperature of the condensing process of the mixed refrigerant, which is condensed while the propane isobutane butane is mixed in the condensing duct.

The secondary refrigerant filled in the outer circumferential surface of the condensing duct 210 evaporates and is condensed and circulates, so that the liquid refrigerant flows in the same direction from the bottom to the top.

In order to measure the temperature change in the condensing process of the internal refrigerant according to the external temperature change by installing several temperature sensors and flowing the mixed refrigerant in the pipe from top to bottom

The first electric heater 203, which is a heat source, is disposed on both sides of the first airtight container 201, which is a U-shaped inverted form, with a first cooling duct 220 as a cooling heat source and a first electric heater 203 as a heat source Liquid refrigerant at the lowermost position, and the condensing duct 210 is also immersed in the secondary refrigerant.

On the other side of the vessel, the first cooling duct (220) is located at a position higher than the secondary refrigerant liquid level.

Thus, the condensation heat emitted from the condensing duct 210 and the heat generated from the first electric heater 203 are combined to evaporate the secondary refrigerant in the liquid phase, and the secondary refrigerant vapor evaporates, then flows upward to the upper side of the other secondary refrigerant liquid The liquid condensed and condensed in the first cooling pipe 220 at a high position falls downward due to the gravity of the earth,

The liquid that has been poured evaporates as heat radiated from the first electric heater 203 and the condensation duct 210, so that the steam is condensed in the first cooling pipe 220 on the other side and then circulates in the condenser 200 .

In this case, the temperature around the condensing duct 210 can be arbitrarily adjusted, so that all the condensation temperatures in the refrigerator refrigerating circuit of the home refrigerator can be reproduced in the same manner as the actual conditions.

Fig. 5 shows a detailed configuration of the freezer compartment evaporation simulation apparatus shown in Fig. Since the freezing room evaporation simulation apparatus 300 and the freezing room evaporation simulation apparatus 400 have the same configuration, the freezing room evaporation simulation apparatus 300 will be described as an example, and the refrigeration room evaporation simulation apparatus 400 will be described in detail. .

 The freezing room evaporation simulation apparatus 300 has a structure similar to that of the condensing apparatus, and the process of controlling the temperature inside the container is the same as that of the condensation simulation apparatus 200.

 Unlike the high-temperature condensation simulation apparatus 200, the secondary refrigerant 302 injected into the second airtight vessel 301 has a low internal temperature of the freezing compartment evaporation simulation apparatus 300, and thus a single substance having a low evaporation temperature and a high evaporation pressure And the refrigerant R22 is injected into the secondary refrigerant 302. [

 The refrigerator compartment evaporation simulation apparatus 400 injects a single substance refrigerant R134A into the secondary refrigerant.

 When the refrigerant vapor adiabatically expanded in the constant pressure expansion valve 304 passes through the second cooling pipe 320 with the condenser 340 having a sufficiently large capacity, the refrigerant vapor flowing in the entire coil section is in a saturated vapor state, And the cooling capacity of the second cooling duct 320 is constant because the amount of heat transferred from the entire heat transfer area of the second cooling duct 320 is the same as that of the second cooling duct 320 according to the ambient temperature.

The saturated refrigerant passing through the second cooling pipe 320 is heated by superheated steam at a predetermined temperature while being passed through the superheater 330 and sucked into the compressor.

Then, the power supplied to the second electric heater 303 is adjusted so that the temperature inside the container is arbitrarily set and maintained.

And the second power meter 350 measures the amount of regulated power supplied.

When the temperature of the temperature sensor T307 is maintained at a predetermined temperature in a state where the compressor 600 (see the refrigerant circuit of FIG. 2) is not operated in controlling the electric power supplied to the second electric heater 303, The amount of power lost is equal to the amount of heat that the second cooling pipe 320 is cooled.

The material having the evaporation temperature suitable for the refrigerating circuit of the household refrigerator is a propane, isobutane, butane, and propane isobutane butane mixture, and a plurality of temperature sensors are disposed in the freezing compartment evaporation duct 310 at predetermined intervals along the flow direction of the refrigerant, As shown in Fig.

6 shows the installation state of the temperature sensor.

A plurality of temperature sensors (TA1-N) measure the temperature of the evaporating process of the mixed refrigerant, which evaporates while the propane isobutane butane is mixed in the evaporation pipe.

The secondary refrigerant 302 filled in the outer circumferential surface of the freezing compartment evaporation duct 310 condenses and evaporates and circulates, so that the direction of the refrigerant flowing in the gas phase flows from the bottom to the top in the same direction.

In order to measure the temperature in the process of evaporation of the internal refrigerant according to the external constant temperature change by installing several temperature sensors and flowing the mixed refrigerant in the pipe from top to bottom

A second cooling pipe 320 as a cooling heat source and a second heat exchanger 303 as a heating heat source are disposed in both channels and a second electric heater 303 as a heating heat source is disposed in the second container 301, Is placed under the secondary refrigerant 302 in the liquid state, and the freezing compartment evaporation duct 310 is placed above the secondary refrigerant liquid level. And the second cooling duct 320 is located at a position higher than the secondary refrigerant liquid level in the other duct of the second gas tight chamber 301.

Thus, the cooling heat, which is the sum of the evaporation heat absorbed by the freezing compartment evaporation duct 310 and the cooling heat that is cooled by the second cooling duct 320, is supplied to the second heat exchanger 303 evaporating the liquid secondary refrigerant, The condensed liquid is condensed in the cooling pipeline 320 at a position higher than the secondary refrigerant liquid level of the other pipelines and some of the secondary refrigerant vapor that has been condensed by the gravitational force is evaporated to the bottom of the freezing compartment evaporation duct The refrigerant is absorbed by the evaporation heat of the freezing compartment 310, cooled and condensed and falls, and the remaining vapor is cooled and condensed by the other second cooling pipe 320 to be circulated in the freezing compartment evaporation simulator 300.

Here, the temperature inside the freezing compartment evaporation duct 310 is controlled so that it is possible to maintain the freezing compartment temperature at -15 ° C or below even in the case where the ambient air temperature changes in the actual refrigerator circuit and the refrigerator is used. and

It is possible to measure the amount of heat to be compensated in accordance with the temperature change inside the freezing compartment evaporation duct 310.

The internal evaporation temperature of the refrigerating compartment evaporation duct 410 (see the refrigerant circuit of FIG. 2) of the refrigerating compartment evaporation simulation apparatus 400 controls the power supplied to the third electric heat exchanger 403

The actual refrigerator controls to keep the refrigerating compartment temperature at 2-4 ° C in all cases that may occur as the room temperature changes and the refrigerator is used

Further, the temperature change of the mixed refrigerant in the refrigerating compartment evaporation duct 410 (see the refrigerant circuit of FIG. 2) is measured and the amount of cooling heat, which is changed according to the measured temperature, is measured and controlled by the third electric heater 403, .

Fig. 7 shows a detailed configuration of the mixing apparatus shown in Fig.

 The mixing ratio of propane isobutane butane should be mixed in consideration of the latent heat of each material and the ratio of calorie consumed in each freezer, refrigerating chamber, and compressor airtight container.

 Especially, when the mixing ratio of propane, isobutane and butane is controlled, the amount of propane that can sufficiently cool the freezing chamber should be condensed at 40 ° C when the condensation temperature of the propane is changed from 40 ° C to 65 ° C at the condenser, The amount of propane should be minimized so that even if the temperature of the freezing compartment is maintained at a low temperature below a certain temperature, the liquid propane should not flow into the refrigerating compartment evaporation line.

Therefore, in the mixing apparatus 100 of FIG. 7, the fourth hermetic vessel 101 is divided into two parts, the fourth cooling duct 102 is disposed in the cooling condensing space, and a space for cooling and condensing the liquid refrigerant is placed on the other And a fourth electric heater 104 for heating the liquid refrigerant condensed at the lowermost portion of the space.

The power supplied to the fourth electric heater 104 is controlled by the SCR voltage regulator 109 that controls the voltage of the electric power supplied to the fourth electric heater 104 so that the temperature sensed by the temperature sensor 107 maintains the set temperature The voltage is regulated and supplied to the electric heater and the supplied electric power is measured by the fourth power meter 108.

In order to measure the amount of refrigerant in the condensed liquid phase, a precise differential pressure gauge (105) having a separation chamber at each of the high and low pressure sides is measured, and the differential pressure generated due to the liquid phase is measured to measure the condensed liquid refrigerant mass.

The condenser 104 for condensing the refrigerant supplied to the fourth cooling pipe 102 to evaporate the refrigerant is connected to the pressure sensor P so that the liquid refrigerant supplied to the pressure- A control signal is given to the inverter (INV) which receives the pressure signal and controls the speed of the condenser cooling blower so that the liquid refrigerant pressure supplied to the constant pressure expansion bulb is kept constant.

The refrigerant flowing in the fourth cooling duct 102 maintains the saturated steam state in the pipeline front part.

So that the temperature of the condensation space around the fourth cooling pipe is kept constant.

Then, the heater 130 is placed so as to maintain the superheated steam state of the refrigerant vapor passing through the fourth cooling pipe and being sucked into the compressor.

The condensation vessel should be kept warm and insulated from the atmosphere.

Propane, isobutane, butane, and gas are heated to obtain sufficient pressure and supplied in ideal gas at a certain pressure or higher.

Each of the gas supply lines is provided with a pressure regulator (PR) for controlling the gas pressure and a gas mass flow controller (MFC1-3) for supplying a predetermined amount of the supplied gas.

The ratio of the amount of heat absorbed by the evaporation heat of the refrigerant in the refrigerating compartment evaporating duct 310 and the refrigerating compartment evaporating duct 410 and the inside of the compressor airtight container is calculated before the mixing mass ratio of propane isobutane butane is calculated

First, the mass ratio of butane and isobutane with high condensation temperature is set to 1: 4, and mass flow controllers (MFC2, MFC3) are set and supplied to the condensing vessel 101 to absorb condensation heat.

The condensed liquid accumulates in the bottom of the condensation vessel

The non-condensable gas is present in the upper space in a vapor phase.

At this time, it is possible to supply the gas while measuring the mass of the gas supplied to the mass flow controller, and to compare the mass of gas supplied and the mass condensed inside the fourth airtight container 101.

Further, the change in the mass condensed in the liquid phase is compared even if the temperature inside the fourth gas tight chamber 101 is increased or cooled.

The condenser 140 is stopped and power is supplied to the fourth electric heater 104 to raise the internal temperature of the fourth airtight container 101 to 65 DEG C so that the saturated vapor pressure inside the container reaches about 8 atm.

Then, propane is injected until the internal pressure of the fourth airtight vessel 101 reaches 15 atm, since the discharge pressure that the refrigerant compressor 500 can bear is 15 atm (when the condensation temperature is 65 deg. C) Is measured.

At this time, in order to condense in the fourth gas tight vessel (101), a pressure higher than about 21 atmospheres is required to condense, so that the supplied propane can not be condensed

  Condensation of the propane while gradually lowering the temperature causes the liquid level to rise, so that a differential pressure is generated due to the liquid, and the differential pressure can be confirmed by measuring the differential pressure with the differential pressure sensor 105 (see FIG. 3). When the condenser 140 is operated and the maximum electric power is applied to the fourth electric heater 104

The lower liquid is boiled in a state where propane, isobutane and butane in the fourth gas tight chamber 101 are mixed and the upper gas is condensed by the fourth cooling channel 102, so that a strong vibration is generated in the fourth gas tight chamber 101 And is circulated while propane, isobutane and butane are evenly mixed to form a mixed refrigerant in an inactive state.

When the electric power supplied to the fourth electric heater 104 is cut off and only the condenser 140 is continuously operated to lower the internal temperature of the fourth gas tight vessel 101, various hydrocarbon substances are separated into a liquid phase and a vapor phase in the internal space, The material is filled with the substance with the lowest evaporation temperature and the ratio of the volume to the evaporation pressure corresponding to that temperature when the temperature is constant.

However, since the difference between the specific volume of the liquid phase and the specific volume of the liquid phase is large, the composition ratio of each substance measured by the mass flow meter is slightly different from the composition ratio of the liquid phase substance.

The secondary is caused by the fact that the substance with the lowest condensation temperature can not condense.

Therefore, it is possible to compensate by converting the mass of the material of the gas phase to the volume, temperature and pressure at which the gas phase substance is present.

2), and is sucked into the compressor 600 (see the refrigerant circuit of FIG. 2) and compressed, and is condensed to the condensing duct 210. The condenser duct 210 is filled with the propane isobutane butane, Lt; / RTI >

The condensed mixed refrigerant evaporates propane from the freezing compartment evaporating duct 310 through the capillary tube 601 to maintain the freezing compartment temperature and evaporates the isobutane in the refrigerating compartment evaporating duct 410 to maintain the refrigerating compartment temperature. Butane evaporates and the superheated propane isobutane is cooled by the heat generated by the motor driving the compressor and the compressor, and then sucked into the compressor.

However, in the case of a domestic refrigerator, the temperature of the freezing compartment is very low according to the use of the freezing compartment and the refrigerating compartment. When the refrigerator compartment is cooled due to the high temperature of the refrigerator compartment and the temperature of the refrigerating compartment is maintained at an appropriate temperature, .

In the case of cooling only the refrigerating chamber such as the electron in the two cases, the temperature inside the condensing duct 210 is raised so as not to condense so that propane evaporated in the freezing compartment evaporating duct does not flow through the capillary.

In the latter case, when the freezing compartment temperature is low and the freezing compartment temperature is high, only the freezing compartment is required to be cooled, the temperature of the condensing duct 210 is lowered to maximize the condensation amount of propane and the pressure of the condensing duct is low, Since the amount of refrigerant flowing into the evaporation channel is minimized, the suction pressure of the compressor is lowered so that most of the liquid refrigerant including propane evaporates in the freezing compartment evaporation duct.

When the temperature of evaporation of isobutane corresponding to the temperature of the refrigerating chamber is maintained at 0.15MP corresponding to the temperature of 0 ° C in the mixed state of propane, isobutane and butane, and the temperature of the freezing compartment is maintained at -15 ° C, Butane and butane do not evaporate but only propane evaporates and the evaporation temperature of propane is about -30 ° C to -25 ° C,

The evaporation temperature of isobutane, which evaporates in the refrigerating compartment evaporation duct (410) to maintain the refrigerating compartment temperature at 2-3 ° C, maintains a temperature that does not freeze at about 0 ° C, thereby suppressing the growth of bacteria such as vegetables and fish in the refrigerating compartment At the same time, moisture evaporation can be prevented and freshness can be maintained

Keep the temperature inside the compressor airtight container at 10 ° C to keep the butane from evaporating in order to keep the ambient temperature at 25 ° C.

Unlike a refrigerator using a conventional single material as a refrigerant, various materials having different evaporation temperatures are mixed with a gas mixture in a non-azeotrope state in order to perform the above operation by mixing propane isobutane butane at a certain ratio in one compressor. The mass of various materials to be mixed in order to keep the freezing compartment temperature and the refrigerating compartment temperature as desired in the refrigerant circuit which absorbs the evaporation heat from the surroundings while dissolving the evaporation heat from the surroundings while mixing and flowing in the liquid phase is obtained in the mixing device 100, The freezing chamber evaporation pipe 310 and the refrigerating compartment evaporation pipe 410 are separately provided in separate specially manufactured containers to insulate the outside of the container from the outside atmosphere so as to be thermally isolated from each other, And the cooling heat source does not change the cooling heat quantity constantly when the temperature inside the container is constant To maintain a constant amount of heat and cooling

Cause of heating The power supplied to the heat exchanger is controlled by the temperature sensor (T207, T307, T407) installed inside the vessel to change the power supplied to maintain the temperature at a constant temperature. It is condensed and evaporated, The amount of heat transferred from the various materials mixed in the evaporation pipe 310 of the freezer compartment evaporation pipe 410 is supplied to the electric heater according to the temperature inside the container. It can be obtained by measuring the power.

When the mixed refrigerant in the channel is condensed and evaporated by the compressor 500, the condensation heat is dissipated in the surroundings and the evaporation heat is absorbed from the surroundings. When the ambient temperature changes, Can be realized

At such a temperature change, the mixed refrigerant, which is condensed and evaporated in the refrigerant circuit, is compressed by one compressor to keep the temperature of the freezing room at -15 ° C or lower and maintain the temperature of 0 ° C at which the freezing- A refrigerant circuit can be implemented.

In addition, the change in temperature depends on the thermal properties of the mixed material, and the temperature and pressure of the material itself are measured. Since the calorie transferred is measured, the mixed refrigerant used in the refrigerant refrigerant circuit is formed, and the mixed refrigerant is applied to the refrigerant circuit. It is possible to save the electric power and improve the refrigerated state of the refrigerated material by obtaining the evaporation temperature in the freezing compartment evaporation duct maintaining the freezing compartment temperature of the refrigerator below -15 ° C and the evaporation duct temperature of the refrigerating compartment maintaining the refrigerating compartment temperature of the image.

Also, it is possible to compare the existing refrigerant with the mixed refrigerant formed by the present invention through various experiments according to the temperature change of the outside air, and to derive the result.

Hereinafter, the determination of the ratio of the amount of cooling heat to determine the mass ratio of the mixed refrigerant according to the present invention will be described in detail with reference to FIGS. 3 to 7.

Isobutane and butane have a higher dew point temperature than propane, so they easily condense in a mixture of propane, isobutane and butane

The amount of propane that is condensed varies with the condensation temperature.

Therefore, the amount of propane present in the liquid phase and vapor phase in the fourth gas tight chamber 101 depends on the temperature change inside the vessel.

At this time, when controlling the temperature of the condensing duct 210 of the actual refrigerator circuit, when the cooling blower (710 of FIG. 2) for condensation rotates at the full speed, it is about 40 ° C

The ISO discharge pressure of the compressor is the saturated vapor pressure at a refrigerant condensation temperature of 65 ° C.

The saturation vapor pressure of the refrigerant R134A used in a conventional domestic refrigerator is about 18.8 atmospheres at a temperature of 65 DEG C

Normally, the evaporation temperature is maintained at about 50 ° C, so that the compressor discharge pressure is about 15 atm.

So that the saturated vapor temperature of the mixed refrigerant is maintained at 65 ° C and the saturated vapor pressure at 15 atm.

That is, when the internal temperature of the condensing vessel is changed from 40 ° C to 65 ° C, the amount of propane contained in the liquid refrigerant should be controlled.

To this end, the ratio of the mass supplied from the gas phase of isobutane and butane to the ratio of the cooling heat amount when the refrigeration chamber is maintained at 4 ° C. and the cooling heat amount for cooling the heat generated by operation of the electric motor and the compressor in the compressor airtight container, And the ratio of the mass to the latent heat of butane.

The ratio of the amount of cooling heat can not be calculated theoretically, and in fact, it is inevitable to conduct experiments with the apparatus shown in Fig.

So, initially, the ratio is set to 4: 1 in each of the mass flow meters MFC2 and MFC3, and isobutane and butane in the gaseous state are supplied to the condensing vessel 101 at this ratio

So that the liquid cooled and condensed in the fourth cooling duct 102 sufficiently immerses the electric heater 104.

When the temperature of the temperature sensor 107 is maintained at 40 ° C. by supplying power to the fourth electric heater 104 and regulating the voltage of the supplied electric power, the saturated vapor pressure is supplied to the pressure transmitter 106) is theoretically 4.9 atmospheres, but it is measured and recorded.

At this time, the electric power supplied to the fourth electric heater 104 is the sum of the cooling heat amount of the fourth cooling pipe 102 and the heat loss externally.

And the ratio of the mass of propane isobutane butane to the freezing chamber, the refrigerating chamber, the inside of the compressor airtight container, and the cooling load ratio thereof is 5: 4: 1

Saturated evaporation temperature in the state of mixing three kinds of materials The saturation evaporation pressure at 40 ° C is

Theoretically, it is about 8 atm.

Then, the mass of the propane is set to the mass flow controller (MFC1) connected to the propane, the electric power to the electric heater (104) is cut off, and the propane is introduced into the fourth gas tight chamber (101).

After all of the propane is introduced, the maximum voltage is applied to the electric heater to evaporate the mixed refrigerant, and the refrigerant rotates at high speed inside the container to be mixed evenly. Thereafter, when the temperature of the temperature sensor 107 is maintained at 40 DEG C and the electric power supplied to the electric heater is kept constant, the amount of liquid can be known by the differential pressure meter 104

The amount of propane contained in the liquid mixed refrigerant can be estimated in comparison with the amount of liquid phase in which isobutane and butane are mixed in the beginning

Then, when the temperature of the temperature sensor 107 is raised to 65 占 폚, the pressure reaches about 14.5 atm, propane contained in the liquid evaporates, and the liquid level decreases and decreases. The amount is known.

That is, when the condensation temperature is 40 ° C, the mass of propane contained in the liquid phase should be about 50% of the mass of the total mixed refrigerant, and should have a latent heat of evaporation capable of cooling the freezing chamber to below -15 ° C

When the condensation temperature is 65 ° C, propane is not condensed in the liquid phase and is minimally evaporated in the freezing compartment evaporation duct 310 to be prevented from flowing into the refrigerating compartment evaporation duct 410.

In the airtight container of the condensation simulation apparatus 200 and the freezer compartment evaporation simulation apparatus 300, there are cooling pipes 220 and 320 which are cooling heat sources and also there are electric heaters 203 and 303 which are heating heat sources. As described above, the refrigerant passing through the inside of the cooling pipe is a single material refrigerant and maintains a saturated vapor state in order to maintain the same inlet and outlet temperatures.

The amount of electric power supplied to the electric heater to maintain the internal temperature constant in a state where the compressor 600 (see the refrigerant circuit of FIG. 2) is not operated is the sum of the amount of cooling heat in the cooling pipe and the amount of heat lost to the outside.

It is possible to reduce the measurement error when the external heat is minimized by thoroughly insulating the outside of the container.

Before the liquid refrigerant mixed and prepared in the fourth condensing vessel 101 is supplied, the temperature is always maintained at the set temperature of each vessel and the amount of supplied electric power is converged to a predetermined value. Thereafter, the condensation simulation apparatus 200 and the freezing chamber evaporation The respective power quantities WM1 and WM2 supplied to the electric heaters of the simulation apparatus 300 must be measured and recorded

In addition, the indication values of the temperature sensor (TC1-N) and the freezer evaporator temperature sensor (TA1-N) of the condensation simulation apparatus 200 should be theoretically the same value. Should be.

The pressure in the fourth hermetic container 101 is kept constant by controlling the electric power of the fourth electric heater 104 of the fourth hermetic container 101 so that the liquid refrigerant mixed and formed in the fourth hermetic container 101 flows through the valve To the compressor (500) through the capillary tube (501) and the capillary tube (502).

The refrigerant is injected into the refrigerant circuit while the compressor is operated and the valve 501 is opened and closed to see the liquid level of the receiver 504, which is made of a glass tube and can observe the internal liquid level, so that the liquid level of the receiver 504 is higher than that of the capillary terminal The valve 501 is closed.

First, the internal temperature of the condensation simulation apparatus 200 is set at 40 ° C in the freezer compartment evaporation simulation apparatus 300 and at -15 ° C in the refrigerator compartment evaporation simulation apparatus 400, respectively.

As the compressor 600 (see the refrigerant circuit of Fig. 2) continues to operate

The liquid phase and the vapor phase including propane isobutane butane and lubricating oil are mixed and operated in the condensation conduit 210 inside the condensation simulation apparatus 200.

The temperature of the process of condensing in the condensing duct 210 is sensed through a plurality of temperature sensors TC1-N in the mixed state, and the condensed state of the mixed materials is detected by the change of the sensed temperature. .

The temperature distribution on the outer surface of the condensing duct 210 can be known by the temperature detectors T204, T205 and T206 of the secondary refrigerant as shown in FIG. 3 which surrounds the outer circumferential surface of the condensing duct 210. [

Particularly, the ratio of propane, isobutane, and butane contained in the liquid mixed refrigerant condensed in the condensing duct 210 varies depending on the temperature around the condensing duct 210, unlike the mixing ratio in the mixing apparatus 100, The amount of propane that is high increases or decreases sensitively with the temperature around the condensate line 210.

That is, when the temperature is low, the amount of propane that condenses and turns into a liquid phase increases, and decreases when the temperature is high. The change in the amount of propane

Depending on the mixing ratio of propane and isobutane butane,

And also depends on the temperature change outside the condensing duct 210.

The measured and measured liquefied propane is evaporated in the freezing chamber evaporator to keep the freezer room temperature below -15 ° C

When the refrigerant temperature in the freezing compartment evaporation pipe is maintained at a predetermined temperature (-23.3 ° C) or lower, propane in the liquid phase in the refrigerant vapor passing through the freezing compartment evaporation duct is completely evaporated in the freezing compartment evaporation duct 310 to be discharged into the refrigerating compartment evaporation duct 410 Should not be introduced.

To confirm this,

As shown in FIG. 2 showing the refrigerant circuit of the actual refrigerator, when the cooling blower of the condensing duct is operated at the full speed, the condensation pipe temperature does not rise by more than 40 ° C. When the condensing temperature is raised by giving the speed of the cooling blower, The refrigerant R134A used as refrigerant refrigerant in the conventional refrigerator maintains the pressure maintaining the maximum condensing temperature of 65 ° C. Therefore, the pressure corresponding to the saturation evaporation temperature of 65 ° C is 18.8 atm.

18.8 Mixed refrigerant maintaining the pressure of about 15 atmospheres lower than the atmospheric pressure The temperature of the saturation temperature is 65 ℃, so the cooling blower controls the speed to maintain ionicity.

The liquid refrigerant is collected in the receiver 504 and flows into the freezing compartment evaporating duct 310 through the capillary tube. The refrigerant adiabatically expands to evaporate the propane having a high evaporating pressure first to evaporate the freezing compartment evaporating duct 210 Because the evaporation heat is absorbed from the secondary refrigerant R22 in the saturated vapor state, the propane in the pipeline evaporates and the secondary refrigerant R22 outside the pipeline condenses.

As such, isobutane and butane may evaporate or condense depending on the temperature of the secondary refrigerant R22 filled in the outer surface of the pipe.

This temperature change depends on the state of the propane isobutane butane inside the conduit and the temperature distribution outside the conduit. Accordingly, the temperature of the inside of the conduit, which is sensed by several temperature sensors installed at a predetermined interval in the conduit, The amount of heat transferred from the external secondary refrigerant temperature detected by the temperature sensors T304, T305 and T306 outside the pipeline, that is, the amount of heat transferred according to the distribution of the temperature difference between the inside and outside of the entire heat transfer area of the evaporation pipe 310, It is possible to calculate the mass of propane isobutane butane vaporized in the evaporator of the freezing compartment by referring to the amount of latent heat and the specific heat determined by the temperature of the propane.

The refrigerating compartment evaporating duct 410 is also connected to the freezing compartment evaporating duct 310 such that the amount of heat transferred by the temperature distribution and the difference in temperature between the freezing compartment evaporating duct 310 and the freezing compartment evaporating duct 310 is measured by a power meter 450, The mass of isobutane and butane evaporated in the refrigerating chamber evaporator is calculated by referring to the latent heat and specific heat.

The temperature of the refrigerating compartment and the temperature of the freezing compartment are changed according to the type and quantity of the articles stored in the refrigerator and the refrigerating load is changed according to the opening and closing of the door of the refrigerator. Accordingly, the freezing compartment temperature is low. The isobutane and butane are mainly introduced into the liquid refrigerant flowing through the capillary and the amount of propane is minimized so that there is no liquid propane which is evaporated in the freezing room evaporating line 310 and flows into the refrigerating room evaporating line 410 Occation

The temperature around the condensing duct 210 is raised by about 65 DEG C to prevent the propane from condensing

At the same time, the pressure of the refrigerant vapor in the condensing duct rises and the amount of isobutane and butane increases, so that the temperature of the cooling chamber is rapidly lowered

When the freezing compartment is cooled only when the freezing compartment temperature is high because the freezing compartment temperature is high enough, the ambient temperature of the condensing duct 210 is lowered to about 40 ° C, so that the amount of liquefied propane is increased and the pressure inside the condenser is lowered, The amount of isobutane and butane is minimized, the amount of propane is increased to cool the freezer compartment, and the pressure of the refrigerant vapor sucked into the compressor is lowered, so that the isobutane and butane are cooled by the lowered suction pressure, The steam temperature is lowered.

In this way, propane, which is evaporated to low temperature in the freezing room according to the change of the temperature at which the refrigerant mixed with propane isobutane butane is compressed by the compressor and is condensed at the condenser, and isobutane which evaporates at the image temperature in the refrigerating chamber, Evaporates and vaporizes the superheated propane and isobutane to evaporate the butane

Propane, isobutane, and butane condense at different temperatures, especially with a mixture of three different substances, and especially propane is condensed at lower temperatures compared to isobutane and butane.

Therefore, the process of condensing and liquefying according to the temperature change of the condensing duct is measured by a plurality of temperature sensors TC1-N at predetermined intervals along the direction of the temperature of the refrigerant flowing in the condensing duct, and the dew point temperature Dew Especially, the mass of propane contained in the liquid mixed refrigerant is the main parameter for calculating the freezing room temperature and the freezing room cooling calorie that maintains the temperature, and the mass of isobutane and butane are the refrigerant and the compressor suction gas It is the main variable that calculates the amount of cooling heat that maintains the temperature and its temperature.

In particular, the amount of the liquid phase staying in the evaporation line changes with temperature depending on the temperature of the freezing compartment refrigerating chamber, which is a main variable for determining the amount of mixed refrigerant injected into the refrigerant circuit.

The condensation mass of the propane varying with the ambient temperature of the condenser 210 (the average value of the temperatures measured at T204, T205 and T206) and the ambient temperature of the freezer evaporator (the average value of the temperatures measured by T304, T305 and T306) T404, T405, and T406), the mass of the liquid-phase refrigerant staying inside the evaporating orifice is set at a predetermined temperature along the direction in which the refrigerant flows in the respective evaporation ducts 310 and 410 of the freezer compartment The temperature measured by the sensors (TA1-N and TB1-N) and the pressure measured by the pressure sensor (PT) show that the propane isobutane butane is compared with the bubble point at the pressure.

As shown in FIG. 8, since the conventional refrigerant circuit uses a single material or a refrigerant having an azeotropic or azeotropic state, the latent heat of evaporation of the refrigerant evaporated at a temperature lower than the lowest temperature of the freezing chamber is absorbed in the freezing chamber and evaporates. The temperature of the refrigerant vapor increases in proportion to the temperature of the refrigerant vapor, and the compressor and the compressor driving motor inside the compressor airtight container are cooled. Therefore, the load factor of the compressor is low.

FIG. 3 is a schematic diagram of a refrigerant circuit for applying a refrigerant in which three types of propane isobutanebutane, which solves the low load factor of the compressor, are actually used in a refrigerant circuit of a refrigerator.

A refrigerating compartment evaporating pipe 410 for cooling the refrigerating compartment by a freezing compartment evaporating pipe 310 for cooling the freezing compartment and a temperature sensor T1 for measuring the temperature of the refrigerant vapor passing through the freezing compartment evaporating pipe, A temperature sensor T3 for measuring the temperature of the steam, and a temperature sensor T2 for detecting the temperature of the refrigerating compartment

In order to maintain the low temperature of the freezer (below -15 ℃), the evaporation of the propane with the lowest evaporation temperature in the evaporator of the freezing chamber is evaporated and the temperature of the refrigerating chamber is changed to isobutane It evaporates at 0 ° C and the butane in the airtight container of the compressor evaporates at 10 ° C to cool the propane and isobutane to keep the superheat low.

The refrigerant that has passed through the capillary absorbs heat from the respective ambient air in the inner space of the duct connected to the two evaporator ducts 310 and 410 and the compressor inlet port and evaporates and is heated to be introduced into the airtight container of the compressor in an overheated state, Since the refrigerant absorbs the heat generated from the compressor and the electric motor in the vessel and cools it, the refrigerant vapor itself is sucked in a slight overheated state.

The temperature sensor T1 senses the very low temperature at which the propane that can be evaporated in the freezer compartment can not evaporate due to a very low temperature of the freezer compartment and reduces the condensation amount of propane by reducing the rotation speed of the condenser cooling blower 710.

When the temperature of the refrigerating compartment is lowered and the outlet refrigerant temperature of the refrigerating compartment evaporation duct is about to be lowered to zero, the rotation speed of the refrigerating compartment blowing fan 720 is increased, so that the temperature of the refrigerating compartment is lowered. The refrigerant compressor is stopped by the temperature signal of the temperature sensor T2 which senses the refrigerant being cooled.

FIG. 8 is a view for comparing the refrigerant temperature change in the conventional refrigerator and the suction pipe after evaporation of the refrigerator according to the present invention.

100: hydrocarbon material mixing apparatus 200: condensation simulation apparatus
300: freezing room evaporation simulation device 400: refrigerator room evaporation simulation device
500: Refrigerant compressor

101: Fourth airtight container 102: Fourth cooling duct
103: constant pressure expansion side 104: fourth electric heater
105: Differential pressure meter 106: Pressure transmitter
107: Temperature sensor 108: Fourth power meter
109: voltage regulator 130: superheater
140: condenser
MFC1-3: Gas mass flow controller
PR: pressure regulator
201: first gas tight shaft container 202: refrigerant liquid
203: first electric heater 204: constant pressure expansion side
210: condensing duct 220: first cooling duct
230: Suction refrigerant gas temperature adjustment tank 240: Condensation unit
250: first power meter
T201: Cooling tube inlet temperature sensor T202: Cooling tube outlet temperature sensor
T203: Suction refrigerant gas temperature sensor T204: Condenser piping temperature sensor
T205: Temperature sensor at the center part of the condensation duct T206: Temperature sensor at the bottom part of the condensation duct
TC1-N: A thermocouple temperature sensor that measures the temperature variation of the entire channel by setting the temperature of the mixed refrigerant flowing inside the condensing channel at a constant interval
301: second gas tight container 302: refrigerant liquid
303: second electric heater 304: constant pressure expansion side
310: freezing room evaporation duct 320: second cooling duct
330: adjusting the temperature of the suction refrigerant gas 340: condensing unit
350: Second power meter 360: SCR power voltage regulator
361: Select switch

T301: Cooling tube inlet temperature sensor T302: Cooling tube outlet temperature sensor
T303: Suction refrigerant gas temperature sensor T304: Ambient temperature sensor around evaporation duct
T305: Temperature sensor at the central part of the evaporation pipe T306: Temperature sensor at the bottom part of the evaporation pipe
TA1-N: A thermocouple temperature sensor that measures the temperature variation of the entire channel by setting the temperature of the mixed refrigerant flowing in the freezing chamber evaporation pipe at a predetermined interval
401: Third airtight container 403: Third electric heater
410: Refrigerating chamber evaporation duct
TB1-N: Thermocouple temperature sensor that measures the temperature variation of the entire piping by setting the temperature of the mixed refrigerant flowing inside the refrigerating chamber evaporation pipe at a predetermined interval.
501: mixed refrigerant injection valve 502: capillary tube
503: Mixed refrigerant discharge valve 504: Receiver made of glass tube
505: mass flow meter 550:
710: condenser blower driving motor 720: refrigerating room circulation blower driving motor
730: Refrigerant compressor driven motor
T1: Freezing room evaporation duct outlet refrigerant temperature T2: Refrigerator room temperature
T3: Refrigerating chamber evaporation pipe outlet temperature

Claims (6)

delete delete 1. A refrigerant circuit simulation apparatus for simulating a refrigerant circuit comprising a compressor, a condensing duct, a freezing compartment evaporating duct applied to a freezing compartment, and a refrigerating compartment evaporating duct applied to a refrigerating compartment,
A condenser simulation apparatus for simulating a condensation process of the condensing duct and measuring a condensation heat amount of the condensing duct for maintaining the temperature inside the airtight container of the compressor accommodated in the compressor at 15 to 20 ° C;
A freezing compartment evaporation simulation device for simulating the evaporation process of the freezing compartment evaporation duct and measuring the amount of cooling heat of the freezing compartment evaporation duct for maintaining the temperature of the freezing compartment at -15 ° C;
A refrigerator compartment evaporation simulation device for simulating the evaporation process of the refrigerating compartment evaporation duct and measuring the amount of cooling heat of the refrigerating compartment evaporation duct for maintaining the temperature of the refrigerating compartment at 0 ° C;
A compression device for compressing the refrigerant provided to the condenser simulation apparatus; And
A mass of butane corresponding to the amount of condensation heat of the condensing duct measured by the condenser simulation apparatus, propane corresponding to the amount of cooling heat of the freezing compartment evaporation duct measured by the freezing compartment evaporation simulation apparatus, A mixing device for mixing hydrocarbons mixed with propane, isobutane, and butane mixed with isobutane corresponding to the heat of cooling of the refrigerating chamber evaporating channel;
The simulation apparatus comprising:
4. The apparatus of claim 3, wherein the condenser simulation device
A first refrigerant conduit through which the refrigerant provided by the compression device flows, and a condensing duct of the refrigerant circuit and a first electric heater below the first refrigerant conduit are provided on one side of the first gas- ,
The internal temperature of the compressor airtight container is adjusted to 15 to 20 占 폚 due to the difference between the power amount of the first electric heater when the compressor of the refrigerant circuit is not activated and the electric power amount of the first electric heater when the compressor of the refrigerant circuit is in operation And the cooling heat quantity to be maintained is measured.
The freezing compartment evaporation simulation apparatus according to claim 3, wherein the freezing compartment evaporation simulation apparatus
And a second cooling coil for flowing the refrigerant supplied from the condenser is installed on one side of the second airtight container in which the U-shape is inverted, and a second electric heater is installed on the other side of the evaporator for cooling the refrigerant circuit. And
To maintain the temperature of the freezer compartment at -15 DEG C by a difference between an amount of power of the second electric heater when the compressor of the refrigerant circuit is not activated and an amount of electric power of the second electric heater when the compressor of the refrigerant circuit is in operation The cooling heat quantity was measured,
The refrigerator compartment evaporation simulation apparatus
A third refrigerant pipe through which the mixed refrigerant flows is provided on one side of the third gas-tight container in a U-shaped inverted form, and a third electric heater is provided on the other side of the refrigerating compartment evaporation duct of the refrigerant circuit and below the evaporator,
The temperature of the refrigerating compartment is maintained at 0 ° C due to the difference between the amount of electric power of the third electric heater when the compressor of the refrigerant circuit is not operating and the amount of electric power of the third electric heater when the compressor of the refrigerant circuit is in operation And the heat quantity is measured.
4. The apparatus of claim 3, wherein the mixing device
The fourth airtight container is divided into two parts. A fourth heat exchanger for heating the liquid refrigerant condensed at the lowermost portion of the space is provided on the other side with a space for cooling refrigerant condensed in the refrigerant condenser. Wherein the simulation apparatus comprises:

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