KR20020037606A - Cooling method of double evaporation type airconditioner using vapor ejector and it sapparatus - Google Patents

Abstract

PURPOSE: A cooling method and device of double evaporation air conditioner using steam ejector are provided to reduce loss on heat exchange due to difference between temperatures of refrigerant and outside air. CONSTITUTION: Refrigerant of high temperature and high pressure having passed a compressor(1) exchanges heat with atmosphere to be converted into compressed fluid and flows out of a condenser(2). The refrigerant passes a first expansion device(3) for isenthalpic expansion by capillaries. A part of the refrigerant is converted into gaseous refrigerant in a first evaporator(4) by isobaric heat absorption process. Rest of the refrigerant is expanded in a second expansion device(5) and converted into gaseous refrigerant in a second evaporator by isobaric heat absorption process. The refrigerant flows into a driving nozzle and an intake nozzle of a steam ejector(7) to be driving fluid and intake fluid. The refrigerant passes a mixing part, a constant sectional area part and a diffuser part to compensate pressure to return to the compressor at fixed pressure.

Description

Cooling method of double evaporation type airconditioner using vapor ejector and it sapparatus}

The present invention relates to a method and a device for cooling a dual evaporation air conditioner using a steam ejector that can reduce energy consumption by using a pure refrigerant and improving the freezing performance. For example, it is a two-stage cooling system using a double evaporator that separates the refrigeration cycle evaporator into the hot part and the cold part evaporator. It is possible to improve the freezing performance and save energy by constructing a simpler and more efficient air conditioning refrigeration cycle than reducing the compression work of two compressors.

Theoretically, the most important factors that directly affect the performance coefficient of the refrigeration cycle, which is defined as the ratio of heat transfer per unit time in the evaporation process to the compressor time per unit time, are the evaporation pressure and the condensation pressure. As the evaporation pressure increases, the performance coefficient of the cycle increases. To achieve this, the average temperature difference between the refrigerant and the secondary fluid air in the evaporator must be reduced.

The smaller this value is, the higher the energy utilization efficiency is, so the better the performance of the heat exchanger, the better the air conditioner performance. Also, the performance of the heat exchanger is a function of various factors such as shape, given temperature condition, type of refrigerant and flow rate. If several factors are determined, the smaller the temperature difference between the two fluids undergoing heat exchange, the better the performance.

Conventional air conditioning refrigeration cycle uses a single compressor and a single evaporator to cool the outside air and the evaporator is designed for the latent heat of evaporation of the refrigerant to maintain a constant temperature and heat exchange with the outside atmosphere. The single evaporator used in the indoor unit has a problem in that the refrigerant in the air inlet portion inside the indoor unit has a large temperature difference from the outside air to cause loss during heat exchange, thereby degrading the performance of the refrigeration cycle.

And conventional refrigeration cycle using a double evaporator is applied to the refrigeration cycle for refrigerators, but the double evaporator used in the refrigerator due to the decrease in freezing performance due to the increase in the compression work generated by using a single evaporator and due to the inflow of the freezer compartment of the refrigerator compartment air In order to solve problems such as odor of the freezer compartment and deterioration of freezing performance due to frost on the surface of the evaporator, an evaporator is installed in each of the refrigerating compartment and the freezer compartment. Are used in different refrigeration cycles.

Therefore, the present invention was created for the purpose of solving the conventional problems as described above by using a double evaporator to reduce the loss during heat exchange due to the temperature difference between the refrigerant and the outside air in the air inlet inside the indoor unit of the air conditioner to the steam ejector The present invention provides a method and a device for cooling a dual-evaporated air conditioner using a vapor ejector that can compensate for the refrigerant in the evaporator at an appropriate pressure, thereby improving the performance of the evaporator to increase the cooling performance of the air conditioner as well as saving energy.

In order to provide the air conditioner, the first evaporator corresponding to the high temperature evaporator and the second evaporator corresponding to the low temperature evaporator are constituted by a double evaporator, and vapor ejectors are installed at the outlets of the two evaporators to adjust the average pressure of the refrigerant entering the compressor. The refrigerant passing through the condenser and the first expansion device is separated, partly passes through the first evaporator, enters the driving nozzle of the vapor ejector, becomes the motive fluid of the ejector, and the other part is the second through the second expansion device. In this case, the refrigerant flowing into the second evaporator passes through the second evaporator at a lower pressure and temperature than the refrigerant flowing into the first evaporator, enters the suction nozzle of the vapor ejector, and suction fluid of the ejector The driving fluid and the suction fluid flowing from the two evaporators to the ejector are mixed in the mixing section. The pressure is compensated by passing through the constant area and diffuser suction, and the refrigerant passing through the ejector at a constant pressure to compensate the pressure difference between the two evaporators is compressed in the compressor to provide a double evaporative air conditioner that circulates the cooling cycle of the air conditioner. It is.

1 is a conceptual diagram showing the overall structure of the present invention the refrigeration cycle

2 is a conceptual diagram showing the structure of the present invention dual evaporator

Figure 3 is an enlarged cross-sectional structure of the ejector of the present invention

<Description of the symbols for the main parts of the drawings>

(1) compressor (2) condenser

(3) first expansion device (4) first evaporator

(5) Second Expansion Device (6) Second Evaporator

(7) Steam Ejector (8) 휀

(9) High temperature evaporator refrigerant circuit (10) High temperature refrigerant inlet

(11) Hot refrigerant outlet (12) Hot evaporator 휜

(13) Low temperature evaporator refrigerant circuit (14) Low temperature refrigerant inlet

(15) Low temperature refrigerant outlet (16) Low temperature evaporator 휜

(17) Drive Nozzle (18) Suction Nozzle

(19) Diffuser (20) Drive Nozzle

(21) Suction nozzle part (22) Mixing part

(23) Constant area area (24) Diffuser

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram showing the overall structure of the refrigeration cycle of the present invention showing a cooling cycle circulated to the compressor, condenser, expansion device, evaporator and ejector, Figure 2 is a conceptual diagram showing the structure of the present invention double evaporator, 3 is an enlarged cross-sectional structural view of the ejector of the present invention.

The high temperature and high pressure refrigerant passing through the compressor (1) is heat-exchanged with the atmosphere, and the refrigerant exiting the condenser (2) in the compressed liquid state is enthalpy-expanded through a capillary tube while passing through the first expansion device (3). The evaporator 4 is made of a gaseous refrigerant through an isothermal heat absorption process, and the rest isotropically expanded in the second expansion device 5 to make it a gaseous refrigerant through an isothermal heat absorption process in the second evaporator 6. The pressure is introduced into the driving nozzle 17 and the suction nozzle 18 of the steam ejector 7 to become the driving fluid and the suction fluid, and the pressure is passed through the mixing part 22, the constant cross-sectional area 23, and the diffuser part 24. It compensates and circulates it again to the compressor 1 by a constant pressure.

The air introduced into the indoor unit by the heat sink (8) in the first and second evaporators (4) and (6), which are the above-mentioned double evaporators, is first cooled in the first evaporator (4), which is a high temperature evaporator, and a second evaporator, which is a low temperature evaporator, In 6), the refrigeration cycle is composed of a two-stage cooling process to be supplied to the room at the set temperature.

Apparatus for implementing the above method is a cooling device consisting of circulating compressor, condenser, expander and evaporator,

In the compressor 1 having an accumulator (not shown) at the inlet, the high temperature refrigerant inlet 10, the refrigerant outlet 11, the high temperature evaporator refrigerant circuit 9 in the first expansion device 3 through the condenser 2. And a first evaporator (4), a second expansion device (5), a low temperature refrigerant inlet (14), a refrigerant outlet (15), a low temperature evaporator refrigerant circuit (13), and a low temperature evaporator (16) consisting of a high temperature evaporator fan (12). The refrigerant sent to the second evaporator (6) consisting of a driving nozzle (20) having a driving nozzle (17), a suction nozzle (21) having a suction nozzle (18), a suction part (22), a constant cross-sectional area The apparatus circulates to the compressor 1 through the vapor ejector 7 which consists of the diffuser part 24 in which the 23 and the diffuser 19 were formed.

In the refrigeration cycle applied to the air conditioner of the present invention as described above, an accumulator is installed at the inlet of the compressor 1 that compresses the gaseous refrigerant of low pressure into a refrigerant of a high temperature and high pressure so as to prevent the introduction of liquid refrigerant into the compressor. The high temperature and high pressure refrigerant from the compressor is passed through the condenser (2) to form a liquid refrigerant through an isothermal heat dissipation process, and isotropically expanded through the capillary tube in the first expansion device (3) and the first expansion device (3) is The refrigerant passing through is classified in two directions, partly to the first evaporator 4, which is a high temperature evaporator, and part of the refrigerant to the second evaporator through the second expansion device 5.

The flow rate ratio classified at this time is determined by the mixing ratio of the steam ejector 7 and the mixing ratio is the temperature and pressure of the first evaporator 4 and the second evaporator introduced into the shape of the steam ejector 7. It is determined as a function of the temperature and pressure of (6) and the inlet pressure of the compressor (1) corresponding to the outlet back pressure of the steam ejector (7).

The refrigerant introduced into the first evaporator 4 is subjected to an isothermal heat absorption process and enters the driving nozzle 17 of the steam ejector 7 in a superheated vapor state to become a driving fluid of the steam ejector 7 and a second expansion device. The refrigerant introduced into (5) is depressurized to the set pressure of the second evaporator (6), which is a low temperature evaporator, and enters the suction nozzle (18) of the steam ejector (7) after passing through the second evaporator (6). The refrigerant which becomes the suction fluid of the vapor ejector 7 and the refrigerant passing through the driving nozzle 17 and the suction nozzle 18 inside the supersonic state is introduced into the mixing unit 22 to mix the two fluids through the exchange of momentum. The fluid will remain supersonic.

The refrigerant exiting the mixing section 22 enters the predetermined cross-sectional area 23, and a vertical shock wave phenomenon occurs in the predetermined cross-sectional area 23 due to the pressure difference from the back pressure of the steam ejector 7. The refrigerant is converted from supersonic speed to subsonic speed to achieve the first pressure compensation, and the refrigerant exiting the constant area area 23 in the subsonic state passes through the diffuser 19 of the diffuser part 24 and receives the second pressure compensation to a constant pressure. It discharges and enters the compressor 1 again, and cools while circulating a cooling cycle.

The air introduced by the double evaporator, i.e., 8 which circulates the air in the indoor unit in the first and second evaporators 4 and 6, is the high temperature evaporator refrigerant circuit 9 of the first evaporator 4, which is a high temperature evaporator. 1) and the high temperature evaporator 휜 (12) undergoes the first cooling process, and the first cooled air passes through the low temperature evaporator refrigerant circuit (13) and the low temperature evaporator (16) of the second evaporator (6), which is a low temperature evaporator. It is cooled by supplying it to the room with the desired set temperature.

The two-stage cooling process reduces the average temperature difference between the atmosphere and the evaporator, thereby improving heat exchange efficiency and improving the performance of the refrigeration cycle and air conditioner.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

Therefore, the present invention is to improve the heat exchange efficiency in the indoor unit of the air conditioner through the two-stage cooling process to reduce the average temperature difference between the refrigerant and the air in the evaporator when using the dual-evaporative air conditioner using the steam ejector, the refrigerant at the compressor inlet using the steam ejector Increasing the pressure can improve the performance of the air conditioning refrigeration cycle and reduce the cooling costs, as well as the efficient use of energy.

Claims (3)

The high temperature and high pressure refrigerant passing through the compressor (1) is heat-exchanged with the atmosphere, and the refrigerant exiting the condenser (2) in the compressed liquid state is enthalpy-expanded through a capillary tube while passing through the first expansion device (3). The evaporator 4 is made of a gaseous refrigerant through an isothermal heat absorption process, and the remaining part is isoenthal expanded in the second expansion device 5 to make it a gaseous refrigerant through an isothermal heat absorption process in the second evaporator 6. The pressure is introduced into the driving nozzle 17 and the suction nozzle 18 of the steam ejector 7 and becomes the driving fluid and the suction fluid, and passes through the mixing part 22, the constant cross-sectional area 23, and the diffuser part 24. A method of cooling a dual evaporative air conditioner using a steam ejector, characterized in that the circulating back to the compressor (1) at a constant pressure. The method of claim 1, The air introduced into the indoor unit by the fin (8) in the first and second evaporators (4) and (6) is first cooled in the first evaporator (4), which is a high temperature evaporator, and the set temperature in the second evaporator (6), which is a low temperature evaporator. Cooling method of a dual evaporation air conditioner using a steam ejector, characterized in that the two stage cooling to be supplied to the room. In the cooling device consisting of a compressor, a condenser, an expander and an evaporator, In the compressor 1 having an accumulator (not shown) at the inlet, the high temperature refrigerant inlet 10, the refrigerant outlet 11, the high temperature evaporator refrigerant circuit 9 in the first expansion device 3 through the condenser 2. And a first evaporator (4), a second expansion device (5), a low temperature refrigerant inlet (14), a refrigerant outlet (15), a low temperature evaporator refrigerant circuit (13), and a low temperature evaporator (16) consisting of a high temperature evaporator fan (12). The refrigerant sent to the second evaporator (6) consisting of a driving nozzle (20) having a driving nozzle (17), a suction nozzle (21) having a suction nozzle (18), a suction part (22), a constant cross-sectional area Cooling apparatus of a dual-evaporative air conditioner using a steam ejector, characterized in that circulated to the compressor (1) through a vapor ejector (7) consisting of a diffuser (24) and a diffuser (19) having a diffuser (19)