AU2020101560A4 - A Novel Heat Storage and Defrosting System for Air Conditioning Units - Google Patents

A Novel Heat Storage and Defrosting System for Air Conditioning Units Download PDF

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Publication number
AU2020101560A4
AU2020101560A4 AU2020101560A AU2020101560A AU2020101560A4 AU 2020101560 A4 AU2020101560 A4 AU 2020101560A4 AU 2020101560 A AU2020101560 A AU 2020101560A AU 2020101560 A AU2020101560 A AU 2020101560A AU 2020101560 A4 AU2020101560 A4 AU 2020101560A4
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AU
Australia
Prior art keywords
heat exchange
exchange fluid
refrigerant
heat
tube
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AU2020101560A
Inventor
Ruquan Liang
Yuanyuan Zhang
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Linyi University
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Linyi University
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Priority to AU2020101560A priority Critical patent/AU2020101560A4/en
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Publication of AU2020101560A4 publication Critical patent/AU2020101560A4/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F24F2005/0064—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/54—Heating and cooling, simultaneously or alternatively
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S60/00—Arrangements for storing heat collected by solar heat collectors
    • F24S60/10—Arrangements for storing heat collected by solar heat collectors using latent heat

Abstract

The invention relates to the field of air conditioning, in particular to a novel heat storage and defrosting system for air conditioning units. The technical scheme is as follows: it comprises an evaporator, an accumulator and a solar collector, wherein the evaporator comprises an air conditioning pipeline and fins, and the air conditioning pipeline is a double-layer sleeve comprising an inner layer pipe and an outer layer pipe. The evaporator is provided with a refrigerant liquid inlet, a refrigerant air outlet, a heat exchange fluid air inlet and a heat exchange fluid air outlet. The refrigerant liquid inlet is connected with the out tube through the capillary tube 1, which is provide with a solenoid valve 5, and connected with the inn tube through the capillary tube 2, which is provided with the electromagnetic valve 4. The heat exchange fluid air inlet is provided with the electromagnetic valve 3. The refrigerant air outlet is connected with the heat exchange fluid air outlet through a red copper tube, wherein the red copper tube is provided with the electromagnetic valve 1. The refrigerant air outlet is provided with the electromagnetic valve 6, and the outer tube outlet is provided with the electromagnetic valve 2. The heat exchange fluid air inlet and the heat exchange fluid air outlet of the evaporator are connected with the heat accumulator; the accumulator is connected with the solar collector. The invention has simple structure and fast defrosting speed, so it effectively overcomes the disadvantages of traditional defrosting. -2/9 13 12 11 10 9 8 7 Fiur4

Description

-2/9
13 12 11 10 9 8 7
Fiur4
AUSTRALIA
PATENTS ACT 1990
PATENT SPECIFICATION FOR THE INVENTION ENTITLED:
A Novel Heat Storage and Defrosting System for Air Conditioning Units
The invention is described in the following statement:-
A NOVEL HEAT STORAGE AND DEFROSTING SYSTEM FOR AIR CONDITIONING UNITS TECHNICAL FIELD
The invention relates to the field of air conditioning, in particular to a novel heat storage and defrosting system for air conditioning unit.
BACKGROUND
When the air conditioner is in heating condition in winter, it is necessary to continuously transport outdoor heat to the room through the heat pump device. At this time, the outdoor heat exchanger acts as an evaporator. When the heat exchange airflow blows through the evaporator, the water vapour in the air will liquefy and solidify on the outer surface of the evaporator. With the passage of time, the outer surface of the outdoor heat exchanger will accumulate a layer of frost that affects heat transfer, greatly affecting the heat exchange efficiency of the heat exchanger. However, the commonly used four-way valve recoil defrosting and compressor hot gas bypass defrosting both have some shortcomings. For the four-way valve recoil defrosting, it does not produce heat in the defrosting process, but absorbs heat from the room, causing indoor temperature fluctuation. At the same time, the four-way valve, as a precise component, is also prone to failure. As for compressor bypass hot gas defrosting, its system needs a larger gas liquid separator, which mainly relies on the friction work of the compressor and part of the heat in the condenser to defrost, resulting in slower defrosting speed, much slower than the reverse defrosting speed of the four-way valve (theoretically 3-5 times slower), so the compressor hot gas bypass defrosting is only suitable for environments with less frosting.
SUMMARY
The invention provides a novel heat storage defrosting system for air conditioning units, which has simple structure and fast defrosting speed and effectively overcomes the disadvantages of traditional defrosting.
The technical scheme of the invention is as follows:
The invention relates to a novel heat storage and defrosting system for air conditioning units, which comprises an evaporator, an accumulator and a solar collector, wherein the evaporator comprises an air conditioning pipeline and fins, and the air conditioning pipeline is a double-layer sleeve including an inner layer pipe and an outer layer pipe. The evaporator is provided with a refrigerant liquid inlet, a refrigerant air outlet, a heat exchange fluid air inlet and a heat exchange fluid air outlet. The liquid inlet of that refrigerant is connected with the out tube through the capillary tube 1, which is provided with a solenoid valve 5. It is also connected with the inn tube through the capillary tube 2, which is provided with an electromagnetic valve 4. The heat exchange fluid air inlet is provided with an electromagnetic valve 3. The refrigerant air outlet is connected with the heat exchange fluid air outlet through a red copper tube, wherein the red copper tube is provided with an electromagnetic valve 1. The refrigerant air outlet is provided with an electromagnetic valve 6, and the outer tube outlet is provided with an electromagnetic valve 2. The heat exchange fluid air inlet and the heat exchange fluid air outlet of the evaporator are connected with the heat accumulator. The accumulator is connected with the solar collector.
For the novel heat storage and defrosting system for the air conditioning units, when the air conditioning unit is in a heating condition without defrosting, the refrigerant enters the outer pipe channel through the capillary tube 1 after throttling and depressurizing through the refrigerant inlet, and flows out from the refrigerant outlet for heating. When defrosting is required on the surface of the evaporator, the refrigerant enters the inner tube channel through the refrigerant inlet through the capillary tube 2 after throttling and depressurizing, and then flows out from the refrigerant outlet for heating. At the same time, the heat exchange fluid in the heat accumulator enters the outer tube channel and flows out from the heat exchange fluid outlet for defrosting. After defrosting, the refrigerant continues to enter the outer tube channel for heating. The solar collector is used for supplying heat to the heat accumulator.
The preferred scheme of the novel heat storage and defrosting system for air conditioning units is that the heat accumulator comprises an outer shell and a heat exchange plate. The outer shell is provided with a heat exchange fluid outlet, a heat exchange fluid inlet, a hot water inlet and a hot water outlet. The heat exchange plate is arranged in the inner part of the outer shell. Some plurality of hot water cavities, heat storage medium cavities and heat exchange fluid cavities are formed between the heat exchange plates. The hot water cavities are connected together through pipelines. The heat storage medium cavities are connected together through pipelines, and the heat exchange fluid cavities are connected together through pipelines. The heat storage medium cavities are arranged between the hot water cavities and the heat exchange fluid cavities, and the hot water and the heat exchange fluid carry out heat exchange through the heat storage medium.
The preferred scheme of the novel heat storage defrosting system for the air conditioning unit is that the heat exchange fluid air inlet of the evaporator is connected with the heat exchange fluid outlet of the heat accumulator through a pipeline, and the heat exchange fluid air outlet of the evaporator is connected with the heat exchange fluid inlet of the heat accumulator through a pipeline and air supply pumps are installed on each pipeline.
The preferred scheme of the novel heat storage defrosting system for air conditioning units is that the heat exchange fluid and the refrigerant are the same working medium, and the heat exchange fluid is always gaseous during defrosting.
The preferred scheme of the novel heat storage defrosting system for air conditioning units is that the outer layer pipe is a seamless steel pipe, and the inner layer pipe is a red copper pipe, which adopts a rolled low fin pipe. The rib material is aluminum or aluminum alloy.
The invention has the beneficial effects as follows: compared with traditional four-way valve recoil defrosting and compressor hot gas bypass defrosting, this invention utilizes the phase change material to store solar energy heat in that heat accumulator. When defrosting is needed, heat is carried to a double-sleeve evaporator through a heat exchange fluid for defrosting, and the flow path of the heat exchange fluid and the refrigerant is controlled through an electromagnetic valve in the evaporator, so that heat can be continuously supplied to the room without absorbing heat from the room for defrosting, and the constant indoor temperature can be ensured. The invention effectively solves the problems that the four-way valve recoil defrosting needs to absorb heat from the room and the hot gas bypass defrosting speed of the traditional compressor is slow. The device of the invention is ingenious in design, simple and reasonable in structure, more energy-saving and environment-friendly while ensuring defrosting effect, and is suitable for improving and upgrading the heating defrosting system by using the invention in production and life.
BRIEF DESCRIPTION OF THE FIGURES
Fig. 1 is a schematic diagram of the overall structure of a new heat storage defrosting system for an air conditioning unit;
Fig. 2 is a schematic view of that internal structure of the evaporator;
Fig. 3 is a schematic view of that remove fin structure of Fig. 2;
Fig. 4 is a partial enlarge view of that left end inside the evaporator;
Fig. 5 is a schematic diagram of the internal primary circuit structure of the evaporator;
Fig. 6 is a partial sectional view of that internal primary circuit of the evaporator;
Fig. 7 is a schematic view of that external structure of the heat accumulator
Fig. 8 is a schematic view of that internal structure of the heat accumulator
Fig. 9 is a schematic diagram of the internal structure of the heat accumulator filled with heat exchange fluid, heat storage medium and hot water.
DESCRIPTION OF THE INVENTION
The invention will be described in further detail below with reference to the
accompanying drawings.
As shown in figures 1 to 6, a novel heat storage and defrosting system for an air conditioning unit comprises an evaporator (1), an accumulator(2) and a solar collector (3), wherein the evaporator (1) comprises an air conditioning pipeline and ribs(21)
, wherein the air conditioning pipeline is a double-layer sleeve including an inner pipe (19) made of a 10 mm x 1 mm copper pipe, and an outer pipe (20) made of a 14 mm x 1.5 mm seamless steel pipe. The evaporator (1) is provided with a refrigerant liquid inlet (13), a refrigerant air outlet (10), a heat exchange fluid air inlet (12) and a heat exchange fluid air outlet (9). The refrigerant inlet port (13) is connected to the outer tube (20) through a capillary tube 1 (16) equipped with solenoid valve 5 (15). The refrigerant inlet (13) is connected to the inner tube (19) through the capillary tube 2(17) provided with a solenoid valve 4 (14). The heat exchange fluid air inlet (12) is provided with the solenoid valve 3 (11). The refrigerant air outlet 10 is connected with the heat exchange fluid air outlet 9 through a 10 mm x 1 mm red copper tube which is provided with the solenoid valve 1 (7). The refrigerant air outlet 10 is provided with the solenoid valve 6 (18), and the outer tube 20 is provided with the solenoid valve 2(8). The number of pipe rows of a single loop on the air conditioning pipeline windward surface is six, and the upper and lower two identical branches are connected in parallel. The evaporator (1) is connected with the heat accumulator (2). The heat accumulator (2) is connected with the solar collector (3).
As shown in figures 7 to 9, the heat accumulator includes an outer shell (22) and a heat exchange plate (30). The outer housing(22)is provided with a heat exchange fluid outlet (25), a heat exchange fluid inlet (24), a hot water inlet (23) and a hot water outlet (26). The heat exchange plate (30) is disposed inside that outer shell (22). A plurality of hot water cavities (27), heat storage medium cavities (28) and heat exchange fluid cavities (29) are formed between the heat exchange plates (30). The hot water cavities( 27) are connected together through pipelines, and the heat storage medium cavities (28) are connected together through pipelines, and the heat exchange fluid cavities (29) are connected together through pipelines. The heat storage medium cavities (28) are arranged between the hot water cavities (270 and the heat exchange fluid cavities (29), and the hot water (31) and the heat exchange fluid (33) conduct heat exchange through the heat storage medium (32). The heat storage medium (32) adopts NaCH3COOH-3H20, which is a phase change heat storage material, and its phase change temperature is 58°C, phase change potential is 264 kJ/kg, and density is 1450 kg/M 3 . As the temperature above 58°C, sodium acetate trihydrate melts and changes from solid to liquid to absorb a large amount of latent heat. Below 58°C, sodium acetate trihydrate solidifies, releases heat, and changes from liquid to solid. The hot water (31) from the solar collector (3) flows in the hot water cavity (29) of the heat accumulator (2) to transfer heat to the sodium acetate trihydrate, so that the heat is stored to the maximum extent. When the heat exchange fluid (33) needs to perform heat exchange, the heat exchange fluid (33) flows through the heat exchange fluid cavity (29) to perform heat exchange with the sodium acetate trihydrate.
The heat exchange fluid air inlet (12) is connected to the heat exchange fluid outlet (25) through a pipe, and the heat exchange fluid air outlet (9) is connected to the heat exchange fluid inlet (24) through a pipe, and air supply pumps are installed on each pipe.
The use process of the above-mentioned new heat storage and defrosting system for air conditioning units is as follows:
When the air conditioning unit is in heating condition, and that surface of the evaporator (1)does not have a frost layer or the frost lay does not reach a certain thickness, the solenoid valve (28), the solenoid valve 3(11), the solenoid valve 4 (14) and the solenoid valve 6 (18) are in a closed state, and the solenoid valve 1 (7 )and the solenoid valve 5 (15) are in an open state.
At this time, the refrigerant passes through the refrigerant inlet (13) to throttle and depressurize in the capillary tube (16), and then enters the channel of the outer pipe (20), and flows out from the refrigerant outlet (10) to enter the indoor unit for heating. As the heating condition progresses, when the frost layer on the surface of the evaporator (1) reaches a certain thickness and needs to be defrosted, the solenoid valves 2(8), 3(11), 4(14) and 6(18) are open, and solenoid valve 1(7) and solenoid valve 5(15) are closed. At this time, that refrigerant passes through the refrigerant inlet (13)to the capillary tube 2 (17) to be throttled and depressurized, and then enters the channel of the inner tube (19), flows out from the refrigerant outlet (10). At the same time, the air supply pump of the heat accumulator (2) is opened to pump the heat exchange fluid (33) into the channel of the outer tube (20) from the heat exchange fluid inlet (12), and flows out from the heat exchange fluid outlet (9), thus can effectively defrost without affecting the working state of the air conditioning unit. When the frost layer melts, the solenoid valves 2(8), 3(11) , 4(14) and 6(18) are closed, and the solenoid valves 1(7) and 5(15) are open. At this time, the refrigerant continues to pass through the outer tube (20), while the heat storage medium (32) continues to exchange heat and store heat with the solar collector (3).
Finally, it should be noted that the above embodiments are intended only to illustrate and not to limit the technical aspects of the present invention. Although the invention has been described in detail with reference to the above-described embodiments, those of ordinary skill in the art will understand that modifications or equivalents may still be made to the specific embodiments of the invention, and any modifications or equivalents that do not depart from the spirit and scope of the invention should be covered by the scope of the claims.

Claims (2)

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:
1. A novel heat storage and defrosting system for air conditioning units, characterized in that it comprises an evaporator, an accumulator and a solar collector, wherein the evaporator comprises an air conditioning pipeline and fins, and the air conditioning pipeline is a double-layer sleeve including an inner layer pipe and an outer layer pipe. The evaporator is provided with a refrigerant liquid inlet, a refrigerant air outlet, a heat exchange fluid air inlet and a heat exchange fluid air outlet. A liquid inlet of that refrigerant is connected with the out tube through a capillary tube, which is provided with the solenoid valve 5. A liquid inlet of that refrigerant is connected with the inn tube through the capillary tube 2, which is provided with the solenoid valve 4. The heat exchange fluid air inlet is provided with the capillary tube 3. The refrigerant air outlet is connected with the heat exchange fluid air outlet through a red copper tube, wherein the red copper tube is provided with the solenoid valve 1. The refrigerant air outlet is provided with the solenoid valve 6, and the outer tube outlet is provided with the solenoid valve 2. The heat exchange fluid air inlet and the heat exchange fluid air outlet of the evaporator are connected with the heat accumulator. The accumulator is connected with the solar collector.
2. The novel heat storage and defrosting system for air conditioning units according to claim 1, characterized in when the air conditioning unit is in a heating condition without defrosting, the refrigerant enters the outer pipe channel through the capillary tube 1 after throttling and depressurizing through a refrigerant inlet, and flows out from the refrigerant outlet for heating. When defrosting is required on the surface of the evaporator, the refrigerant enters the inner tube channel through the refrigerant inlet, passes through the capillary tube 2 throttling and depressurization, flows out from the refrigerant outlet for heating, and at the same time, the heat exchange fluid in the heat accumulator enters the outer tube channel and flows out from the heat exchange fluid outlet for defrosting. After defrosting, the refrigerant continues to enter the outer tube channel for heating. The solar collector is used for supplying heat to the heat accumulator.
3. The novel heat storage defrosting system for air conditioning units according to claim 1, characterized in that the heat accumulator comprises an outer shell and a heat exchange plate. The outer shell is provided with a heat exchange fluid outlet, a heat exchange fluid inlet, a hot water inlet and a hot water outlet. The heat exchange plate is arranged in the inner part of the outer shell. Some plurality of hot water cavities, heat storage medium cavities and heat exchange fluid cavities are formed between the heat exchange plates. The hot water cavities are connected together through pipelines. The heat storage medium cavities are connected together through pipelines, and the heat exchange fluid cavities are connected together through pipelines. The heat storage medium cavities are arranged between the hot water cavities and the heat exchange fluid cavities, and the hot water and the heat exchange fluid carry out heat exchange through the heat storage medium.
4. The novel heat storage defrosting system for air conditioning units according to claim 3, characterized in that the heat exchange fluid air inlet of the evaporator is connected with the heat exchange fluid outlet of the heat accumulator through a pipeline, and the heat exchange fluid air outlet of the evaporator is connected with the heat exchange fluid inlet of the heat accumulator through a pipeline and an air supply pump is installed on both the pipeline.
5. The novel heat storage defrosting system for air conditioning units according to claim 1, characterized in that the heat exchange fluid and the refrigerant are the same working medium, and the heat exchange fluid is always gaseous during defrosting.
6. The novel heat storage and defrosting system for air conditioning units according to claim 1 characterized in that the outer layer tube is a seamless steel tube, the inner layer tube is a red copper tube, which is a rolled low-fin tube. The rib material is aluminum or aluminum alloy.
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Figure 8
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Figure 9
AU2020101560A 2020-07-29 2020-07-29 A Novel Heat Storage and Defrosting System for Air Conditioning Units Ceased AU2020101560A4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2020101560A AU2020101560A4 (en) 2020-07-29 2020-07-29 A Novel Heat Storage and Defrosting System for Air Conditioning Units

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU2020101560A AU2020101560A4 (en) 2020-07-29 2020-07-29 A Novel Heat Storage and Defrosting System for Air Conditioning Units

Publications (1)

Publication Number Publication Date
AU2020101560A4 true AU2020101560A4 (en) 2020-09-03

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AU2020101560A Ceased AU2020101560A4 (en) 2020-07-29 2020-07-29 A Novel Heat Storage and Defrosting System for Air Conditioning Units

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