CN108488918A - A kind of full effect multi-mode energy-saving air conditioning system - Google Patents

Abstract

The invention discloses a kind of full effect multi-mode energy-saving air conditioning systems, including outdoor host computer and indoor unit, outdoor host computer are to include refrigeration system and heat pipe condenser section heat exchanger；The high temperature side and heat pipe condenser section heat exchanger of refrigeration system are set to wind channel region；The first working medium passage and the second working medium passage of heat can be exchanged with each other by being provided in refrigeration end heat exchanger, and the first working medium passage string is set to refrigeration system, and the second working medium passage string is set to hot-pipe system；Indoor unit is at least one indoor heat-pipe apparatus；Fluid reservoir and working medium pump are additionally provided in outdoor host computer, heat pipe condenser section heat exchanger is connected to by pipeline with the second working medium pipeline of hot-pipe system, and is formed using refrigeration system and/or heat pipe condenser section heat exchanger as the hot-pipe system of low-temperature receiver by the combination of the open and close of the first block valve, the second block valve.The air-conditioning system of the present invention is capable of providing the multi-mode operation for being adapted to various Various Seasonal environment, more complete to imitate, is energy saving.

Description

A full-efficiency multi-mode energy-saving air-conditioning system

technical field

The invention relates to an air-conditioning system, in particular to an air-conditioning system suitable for a machine room environment.

Background technique

With the development of social informatization, the number of information facilities such as data centers and base stations of various sizes has increased rapidly, and the heat generation of various IT equipment has also doubled. At present, the energy consumption of precision air conditioning and refrigeration in data centers has It has become the second largest energy-consuming item next to IT equipment. Therefore, the energy-saving design of precision air conditioners is of great significance.

Different from conventional comfort air conditioners, the IT equipment and auxiliary equipment in the data center computer room generate heat throughout the year, and need cooling and heat dissipation no matter in winter or summer. However, when the outdoor temperature is low in winter or spring and autumn, natural cooling can be used, and the outdoor environment can be used to As a cold source, it directly or indirectly cools the equipment in the computer room to replace or assist high-energy-consuming compression refrigeration equipment.

At present, there are several natural cooling methods as follows:

1. Air-to-air direct heat exchange (hereinafter referred to as air-to-air heat exchange): its principle is shown in Figure 1. The return air in the high-temperature computer room (such as 35°C) and the low-temperature fresh air (such as 15°C) perform heat exchange in the plate heat exchanger. After the return air cools down (such as 23°C), it is sent to the machine room to bear the indoor heat load.

Its advantage is that the heat source and cold source air directly exchange heat, and the heat exchange efficiency is high. The disadvantage is that due to the small specific heat capacity of the air (about 1.005kj/kg.℃), a large air flow rate is required to obtain sufficient cooling, so the unit and connection The air duct is huge in size and can only be installed very close to the machine room, and a huge air outlet must be prefabricated on the wall or roof. The building of the machine room often cannot provide suitable installation conditions, and the application occasions are severely limited.

2. Directly introduce low-temperature fresh air: This method is the most direct, but the data center has high requirements for stability and reliability. There are many uncontrollable factors in the fresh air, such as dust, acid gas, corrosive gas, humidity, etc., and it is sent directly or through general filtration There is a greater risk in sending it to the computer room after processing, so there are few practical applications.

3. Separate heat pipe natural cooling: the main principle is to use two indoor and outdoor heat exchangers as the evaporation side and condensation side of the heat pipe respectively. Agents (such as R22, R410a, R134a, etc.) are used as heat pipe working fluids, and are currently widely used in outdoor cabinets, using gravity to overcome the circulation resistance of the working fluid. as shown in picture 2.

Its advantage is that it can be installed separately without a huge air duct connection, but because there is no mechanical power cycle, there are also strict installation distances and height difference limits, and the heat exchange efficiency is average, so it can only be used as an auxiliary energy-saving application.

To sum up, the current commonly used methods include the emerging natural cooling methods, which have many problems and cannot make stable and efficient use of natural cooling sources.

On the one hand, there are various disadvantages in the existing schemes, and on the other hand, the research on more environmentally friendly natural refrigerants is in the ascendant. For example, R744 (that is, CO ₂ ), which has many advantages, cannot be used due to its critical temperature and working pressure. Therefore, there is an urgent need for a new type of energy-saving air-conditioning unit that can solve the above problems and realize the application of new working fluids.

Contents of the invention

The technical problem to be solved by the present invention is to provide a more efficient energy-saving air-conditioning system that operates in multiple modes and is suitable for various seasonal environments.

In order to solve this technical problem, the technical scheme that the present invention adopts is as follows:

A full-efficiency multi-mode energy-saving air-conditioning system, including an outdoor host and an indoor unit. The outdoor host includes a complete set of refrigeration system and heat pipe condensation section heat exchanger; the space function of the outdoor host is divided into a host area and an air channel area; an outdoor machine air inlet is provided on the outdoor main unit shell near the main machine area in the air channel area, and an external fan is provided at the end of the air channel area away from the main machine area. forming a cold air channel for the outdoor main unit to the outdoor fan;

The refrigeration system includes a high-temperature side and a low-temperature side, and the low-temperature side is a heat exchanger at the cooling end;

The high-temperature side of the refrigeration system and the heat exchanger in the condensation section of the heat pipe are arranged in the air passage area, which can exchange heat with the cold air in the cold air passage; Air flow, whose temperature is lower than the temperature of the condenser and the heat exchanger in the condensation section of the heat pipe, is called cold air.

The heat exchanger at the cooling end is provided with a first working medium channel and a second working medium channel capable of exchanging heat with each other, and the first working medium channel is provided with a first working medium channel inlet and a first working medium channel outlet, The second working medium channel is provided with a second working medium channel inlet and a second working medium channel outlet; the first working medium circulates in the refrigeration system; the first working medium channel is arranged in series in the refrigeration system In the pipeline as the low temperature side of the refrigeration system;

The indoor unit is at least one indoor heat pipe device, and the indoor heat pipe device includes a heat exchanger in the evaporating section of the heat pipe and an indoor heat pipe fan;

The outdoor host is also provided with a liquid storage tank and a working medium pump; the outlet of the liquid storage tank is connected to the inlet of the working medium pump, and the inlet of the liquid storage tank is exchanged with the cooling end through the first heat pipe. The outlet of the second working medium of the heater is connected, the outlet of the working medium pump is connected with the working medium inlet of the heat pipe evaporation section heat exchanger in the indoor heat pipe device, and the heat pipe evaporation section heat exchanger in the indoor heat pipe device The outlet of the working fluid communicates with the second inlet of the cooling end heat exchanger through the second heat pipe;

The working fluid inlet of the heat pipe condensing section heat exchanger communicates with the second heat pipe through the third heat pipe, and its connection forms a first heat pipe tee point; the working medium outlet of the heat pipe condensing section heat exchanger passes through The fourth heat pipe is in communication with the second heat pipe, and its joint forms a second heat pipe tee point, and the second heat pipe is provided with a first heat pipe in series between the first and second heat pipe tee points. Cut-off valve; the second heat pipe pipe between the tee point of the second heat pipe and the second working medium inlet of the cooling end heat exchanger passes through the fifth heat pipe pipe and the first heat pipe pipe connected, a second cut-off valve is arranged in series on the fifth heat pipe;

When the first cut-off valve is opened and the second cut-off valve is closed, the outdoor main unit and Heat transfer system between indoor units (i.e. heat pipe system);

When the first shut-off valve is closed and the second shut-off valve is opened, the heat exchanger using the heat pipe condensation section heat exchanger is formed by the heat pipe evaporation section heat exchanger, the heat pipe condensation section heat exchanger, the liquid storage tank and the working fluid pump. The heat transfer system (ie heat pipe system) between the outdoor host and the indoor unit;

When the first and second cut-off valves are closed at the same time, the simultaneous use refrigeration system is formed by the heat exchanger in the evaporating section of the heat pipe, the heat exchanger in the condensing section of the heat pipe, the heat exchanger at the cooling end, the liquid storage tank and the working medium pump. and the heat transfer system (ie heat pipe system) between the outdoor main unit and the indoor unit of the heat exchanger in the condensation section of the heat pipe.

The heat transfer system circulates the second working fluid.

Further, the refrigeration system includes a compressor, a condenser, an expansion valve and a heat exchanger at the cooling end arranged in series; the high temperature side of the refrigeration system is a condenser; the compressor has an exhaust port and a return port , the inlet of the first working medium channel communicates with the expansion valve, and the outlet of the first working medium channel communicates with the gas return port of the compressor.

Further, in the cold air channel, the heat exchanger and the condenser in the condensation section of the heat pipe are sequentially arranged along the direction from the air inlet of the external machine to the external fan, and next to the heat exchanger in the condensation section of the heat pipe A first bypass ventilation valve is arranged on the side, and the space on both sides of the cold air channel can be separated by the heat exchanger in the condensation section of the heat pipe and the first bypass ventilation valve; a second bypass ventilation valve is arranged on the side of the condenser, The space on both sides of the cold air channel can be separated by the condenser and the second bypass air valve;

When the first shut-off valve is opened and the second shut-off valve is closed, the first bypass ventilation valve is opened and the second bypass ventilation valve is closed at the same time. The heat exchange is completed through the condenser, that is, most of the cold air passes through the first bypass ventilation valve with smaller wind resistance, and a small part of the cold air passes through the heat exchanger in the condensing section of the heat pipe;

When the first cut-off valve is closed and the second cut-off valve is opened, the second bypass ventilation valve is opened and the first bypass ventilation valve is closed at the same time, and the cold air entering from the air inlet of the external unit passes through the heat exchanger in the condensation section of the heat pipe After heat exchange, it is mainly discharged through the second bypass ventilation valve;

When the first and second cut-off valves are closed at the same time, the first bypass valve and the second bypass valve are also closed at the same time, and the cold air entering the air inlet of the external unit first passes through the condensation section of the heat pipe for heat exchange. After exchanging heat through the condenser, the heat is exchanged through the condenser.

Further, the second working fluid is R744.

More preferably, a regenerator is also provided, and the regenerator is provided with a first regenerating pipeline and a second regenerating pipeline capable of exchanging heat with each other, and the first regenerating pipeline is arranged in series with the compressor. On the pipeline between the exhaust outlet of the condenser and the condenser, the second heat recovery pipeline is arranged in series on the pipe between the outlet of the first working medium passage of the heat exchanger at the cooling end and the air return inlet of the compressor on the way.

Further, a one-way valve is arranged in series between the first heat recovery pipeline and the exhaust port of the compressor to prohibit reverse flow from the first heat recovery pipeline to the direction of the compressor.

Further, a spraying device is provided at the initial section of the air channel area of the outdoor main unit close to the air inlet of the external machine, and the spraying device is provided before the condenser and the heat exchanger in the condensation section of the heat pipe along the ventilation direction; The spraying device described above includes a water storage box, a booster pump, an atomizing nozzle and a water tray, the water storage box is connected to the water supply pipeline through a water supply valve, and the atomizing nozzle is connected to the water storage box through a booster pump In communication, the water tray is arranged under the atomizing nozzle and connected to the water storage box, collects excess water droplets and re-collects them into the water storage box.

Further, the first and second cut-off valves are electromagnetic valves.

The full-efficiency multi-mode air-conditioning system of the present invention has an ingenious structure. First, the present invention separates the air-conditioning system into the refrigeration system of the outdoor main unit and the heat pipe heat transfer system between the outdoor main unit and the indoor unit; through such separation, long-distance air-conditioning Environmentally friendly refrigerants can be used in the system's working fluid pipelines, and its adaptability to various environments and environmental protection have been greatly improved. At the same time, the present invention cleverly sets the condensing section of the heat pipe heat transfer system to freely switch between the three condensing modes of the refrigeration system mode and/or the natural air cooling mode, so as to adapt to environmental changes in different seasons in order to obtain the best Energy utilization and air-conditioning efficiency; the invention skillfully completes the switching of the three condensing modes through the unique pipeline design of the heat transfer system of the outdoor main unit and matching the settings of the first and second cut-off valves. The air conditioning system of the present invention not only has the normal cooling function, but also has the function of fully utilizing the outdoor natural cold source when the temperature is low, and is especially suitable for data centers, precision machine rooms and other applications that require year-round cooling, and meets the requirements of energy saving and emission reduction. Modern industrial development concept.

In order to improve the working efficiency of the cold air channel with the three condensation modes, the present invention further optimizes the structure of the cold air channel, and cleverly sets the first and second bypass ventilation valves to match with the heat exchanger and the condenser in the condensation section of the heat pipe respectively to form a separated cold air The secondary air duct isolation of the channel, through the different opening and closing combinations of the first and second bypass ventilation valves to match the switching of the three condensation modes, enables the cold air channel to achieve the best use efficiency.

Furthermore, a spraying device is installed at the initial section of the air passage area of the outdoor main unit close to the air inlet of the outdoor unit, so that the air entering the cold air passage of the outdoor main unit can be cooled first and then exchange heat through the heat exchanger or condenser in the condensation section of the heat pipe. , making the intensity and efficiency of heat exchange in the condensation section higher.

Air-conditioning system main advantage of the present invention is as follows:

1. The utilization rate of the outdoor cold source is high. Regardless of whether the refrigeration system is turned on or not, as long as the outdoor temperature is lower than the temperature of the second working medium of the heat pipe system, heat can be exchanged, and the natural cold source can be fully utilized.

2. The indoor and outdoor connection of the heat pipe system is simple, and there is no need to consider the common oil return problem of the refrigeration system.

3. The heat pipe system can also use a variety of phase change working fluids, and the selection of working fluids is very free. Compared with the fluorine pump air conditioning unit, there is no need to consider the high and low pressure saturation temperature, compression ratio, and refrigerant of the compressors in the shared system. Oil solubility, high cleanliness and many other stringent requirements, so it is possible to look for natural working fluids that are more environmentally friendly and low in cost. Taking the natural working medium R744 (that is, CO ₂ ) as an example, if it is used in a conventional compression refrigeration system, CO ₂ has the disadvantages of low critical temperature (31.1°C) and high working pressure, but there is no compressor boosting process in the heat pipe system, and the temperature of the refrigerant during operation is generally below 20°C, which can be well maintained in the two-phase region. Work.

If applied to the heat pipe system, CO ₂ has advantages that other refrigerants cannot match, such as:

a. Environmentally friendly and cheap, CO ₂ is a natural working fluid, its ozone decay index ODP=0, and its greenhouse index GWP=1.

b. Large latent heat of evaporation and large cooling capacity per unit volume. For example, at 0°C, its cooling capacity per unit volume is as high as 5.12 times that of R22 refrigerant and 8.25 times that of R12. This can greatly reduce the pipeline volume and charge.

c. Low kinematic viscosity. For example, at 0°C, its kinematic viscosity is only 5.2% of R717 and 23.8% of R12, which can further reduce the pipe diameter and increase the flow rate without increasing the pressure drop.

d. High thermal conductivity, can reduce the volume of heat exchanger.

4. The pipe installation of the heat pipe system is simpler. Since there are no high-precision components such as compressors and expansion valves in the system, and there is no refrigeration oil with strong hygroscopicity, the process requirements are simplified, and there is no need to install additional elbows such as oil traps. .

5. Due to the convenience of installation, it has better applicability. Compared with air-to-air heat exchange, it no longer needs huge air duct connections, tens of tons of heat exchange units, and there is no high wind resistance of air-to-air plate heat exchangers. .

6. The refrigeration system is integrated, and its component assembly, vacuuming and refrigerant addition are all factory-installed, which greatly improves the reliability and stability of the refrigeration system and eliminates common engineering installation problems, such as welding leakage and welding anti-oxidation If it is not in place, it will cause oxidized impurities in the tube, incomplete vacuuming, inaccurate refrigerant charge, etc., so as to avoid the decline in refrigeration system efficiency and increase in failure rate.

7. Conventional computer room air conditioners generally place refrigeration components such as compressors in the indoor unit, and the condenser is placed outdoors. Since the air conditioning system of the present invention adopts the natural cooling method, the compressor does not need to be started in the low-temperature season, so all refrigeration components such as the compressor are placed in the outdoor unit without considering low-temperature start-up, refrigerant migration and other issues, and the indoor unit only needs a heat exchanger. Combined with the fan, the volume of the unit can be reduced and the precious room area is saved.

8. The refrigeration system is integrated and placed in the outdoor unit, which not only increases the reliability and efficiency, but also greatly reduces the number of times to enter the computer room for air conditioning maintenance, which is more conducive to ensuring the stability of the computer room environment.

9. The outdoor main unit can realize the effect of modular assembly, such as the combination of two or more outdoor main units, sharing the same heat pipe system, which not only realizes decentralized handling and installation, but also simplifies the system and reduces pipelines.

10. The design of the indoor end of the heat transfer system (heat pipe system) is flexible, and it can adopt various forms such as cabinet type, row, ceiling, box type, and cooling backboard to meet the needs of different occasions.

11. The outdoor main unit has the air valve switching function, so that the condenser and the heat exchanger in the condensation section of the heat pipe can share a set of fans without increasing the resistance and energy consumption of the fans.

12. The outdoor host can also be equipped with a spray humidification function, which reduces the temperature of the outdoor air-in dry bulb, further saves energy consumption, and expands the scope of utilizing natural cold sources.

Description of drawings

In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a structural schematic diagram of an air-air direct heat exchange air conditioner in the prior art.

Fig. 2 is a schematic structural diagram of a split heat pipe air conditioner in the prior art.

Fig. 3 is a schematic structural view of the full-efficiency multi-mode energy-saving air-conditioning system of the present invention.

Fig. 4a is a schematic diagram of the flow of the second working fluid when the first electromagnetic valve is open and the second electromagnetic valve is closed, where the thick line is the pipeline through which the second working medium flows.

Fig. 4b is a schematic diagram of the air flow path of the cold air channel when the first bypass ventilation valve is opened and the second bypass ventilation valve is closed.

Fig. 5a is a schematic diagram of the flow of the second working fluid when the first electromagnetic valve is closed and the second electromagnetic valve is open, where the thick line is the pipeline through which the second working fluid flows.

Fig. 5b is a schematic diagram of the air flow path of the cold air channel when the first bypass ventilation valve is closed and the second bypass ventilation valve is opened.

Fig. 6a is a schematic diagram of the flow of the second working fluid when the first solenoid valve and the second solenoid valve are closed simultaneously, where the thick line is the pipeline through which the second working fluid flows.

Fig. 6b is a schematic diagram of the air flow path of the cold air channel when the first bypass ventilation valve and the second bypass ventilation valve are closed simultaneously.

Fig. 7 is a structural schematic diagram of a spraying device provided in an air-conditioning system.

In the picture:

100. Outdoor host

1. Heat exchanger in condensing section of heat pipe 2. Air inlet of external unit 3. External fan

4. Compressor 5. Condenser 6. Expansion valve

7. Cooling end heat exchanger

71. The entrance of the first working medium channel 72. The exit of the first working medium channel

73. The entrance of the second working medium channel 74. The exit of the second working medium channel

200. Indoor heat pipe device

8. Heat pipe evaporator heat exchanger 9. Indoor heat pipe fan 10. Liquid storage tank

11. Working fluid pump 12. First heat pipe 13. Second heat pipe

14. The third heat pipe 15. The fourth heat pipe

101. The first heat pipe tee point 102. The second heat pipe tee point

16. The first solenoid valve 17. The fifth heat pipe 18. The second solenoid valve

19. Regenerator 20. First bypass ventilation valve 21. Second bypass ventilation valve

22. Spray device 23. One-way valve

221. Water storage box 222. Booster water pump 223. Atomizing nozzle

224. Water tray 225. Water filling valve

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

Figure 3 shows a full-effect multi-mode energy-saving air-conditioning system, including an outdoor host 100 and an indoor unit, the outdoor host 100 includes a complete refrigeration system and heat pipe condensation section heat exchanger 1; the outdoor host 100 The space function area of the space is divided into the host area and the air channel area; the outdoor unit air inlet 2 is set on the outer shell of the outdoor host 100 close to the host area in the air channel area, and the air inlet 2 is set at the end of the air channel area away from the host area There is an external fan 3 , and a cold air passage for the outdoor main unit 100 is formed from the air inlet 2 of the external unit to the external fan 3 .

The refrigeration system includes a compressor 4, a condenser 5, an expansion valve 6 and a heat exchanger 7 at the refrigeration end arranged in series; the refrigeration system adopts a conventional compression refrigeration method, and the system is filled with refrigerant; The heat exchanger 7 plays the role of an evaporative heat exchanger in the refrigeration system, and various heat exchanger types can be used, including but not limited to shell-and-tube heat exchangers, casing heat exchangers, plate heat exchangers, etc.; the compressor has Exhaust and return air.

The condenser 5 and the heat exchanger 1 in the condensation section of the heat pipe are arranged in the air channel area and can exchange heat with the cold air in the cold air channel; the cold air refers to the air flow formed by outdoor air in the cold air channel , its temperature is lower than the temperature of the condenser 5 and the heat exchanger 1 in the condensation section of the heat pipe, so it is called cold air.

The cooling end heat exchanger is provided with a first working medium channel and a second working medium channel capable of exchanging heat with each other, and the first working medium channel is provided with a first working medium channel inlet 71 and a first working medium channel outlet 72, the second working medium channel is provided with a second working medium channel inlet 73 and a second working medium channel outlet 74; the first working medium circulates in the refrigeration system; the first working medium channel inlet 71 and The expansion valve 6 is in communication, and the first working medium channel outlet 72 is in communication with the gas return port of the compressor 4 .

The indoor unit is at least one indoor heat pipe device 200, and the indoor heat pipe device 200 includes a heat exchanger 8 in the evaporating section of the heat pipe and an indoor heat pipe fan 9;

The outdoor main unit 100 is also provided with a liquid storage tank 10 and a working medium pump 11; the outlet of the liquid storage tank 10 is connected to the inlet of the working medium pump 11, and the inlet of the liquid storage tank 10 passes through the first heat pipe pipe 12 communicates with the second working medium outlet 74 of the refrigeration end heat exchanger 7, and the outlet of the working medium pump 11 communicates with the working medium inlet of the heat pipe evaporation section heat exchanger 8 in the indoor heat pipe device 200, In the indoor heat pipe device 200 , the outlet of the working fluid of the heat exchanger 8 in the heat pipe evaporating section communicates with the second inlet 73 of the cooling end heat exchanger 7 through the second heat pipe pipe 13 .

The working medium inlet of the heat pipe condensing section heat exchanger 1 communicates with the second heat pipe pipe 13 through the third heat pipe pipe 14, and its connection forms a first heat pipe tee point 101; the heat pipe condensing section heat exchanger 1 The outlet of the working medium communicates with the second heat pipe 13 through the fourth heat pipe 15, and its connection forms a second heat pipe tee point 102, and on the second heat pipe 13 is the first heat pipe tee point 101 1. A first solenoid valve 16 is arranged in series between the second heat pipe tee point 102; The pipeline between the working fluid inlets 73 communicates with the first heat pipe 12 through the fifth heat pipe 17, and the second solenoid valve 18 is arranged in series on the fifth heat pipe 17;

The refrigeration principle of the refrigeration system is as follows: the refrigerant in the gas-liquid two-phase state evaporates and absorbs heat in the heat exchanger 7 at the refrigeration end, and the low-temperature and low-pressure refrigerant gas is sucked into the compressor 4 to increase the pressure, and becomes a high-temperature and high-pressure refrigerant gas. After entering the condenser 5, it becomes a high-pressure liquid after equal pressure and heat release. The refrigerant liquid passes through the expansion valve 6 to throttle and reduce pressure, and then re-enters the cooling end heat exchanger 7 to evaporate and refrigerate, and so on.

More preferably, the air conditioning system is also provided with a regenerator 19, and the regenerator 19 is provided with a first heat recovery pipeline and a second heat recovery pipeline capable of exchanging heat with each other, and the first heat recovery pipeline is arranged in series On the pipeline between the exhaust port of the compressor 4 and the condenser 5, the second heat recovery pipeline is arranged in series between the outlet 72 of the first working medium channel of the heat exchanger 7 at the cooling end and the On the pipeline between the gas return ports of the compressor 4.

The reason why the regenerator is used is that the heat exchanger at the refrigeration end adopts the form of high-efficiency heat exchange. A regenerator must be used to make the suction have a certain degree of superheat, and it also has the effect of pre-cooling the exhaust. In addition, considering that the evaporation temperature of the system is relatively high, there will be little difference between the suction temperature and the liquid pipe temperature in transitional seasons, so the unique exhaust heat recovery is adopted instead of the traditional liquid pipe heat recovery.

In the cold air passage, the heat exchanger 1 and the condenser 5 in the condensation section of the heat pipe are sequentially arranged along the direction from the air inlet 2 of the external machine to the external fan 3, and the heat exchanger 1 in the condensation section of the heat pipe The first bypass air valve 20 is arranged on the side of the heat pipe condensation section heat exchanger 1 and the first bypass air valve 20 can separate the space on both sides of the cold air passage; the side of the condenser 5 is provided with The second bypass air valve 21 can separate the space on both sides of the cold air passage by the condenser 5 and the second bypass air valve 21;

There are three situations for the heat dissipation of the outdoor host:

1. When the outdoor temperature is high (such as >22°C), the system cannot directly use outdoor air to cool down, and must use the refrigeration system as a cold source. The second working medium is condensed in the heat exchanger 7 at the refrigeration end without passing through the condensation section of the heat pipe heat exchanger 1. The refrigeration system starts to refrigerate, and the heat of the heat transfer system (ie, the heat pipe system) is transferred to the refrigeration system through the heat exchanger 7 at the refrigeration end to achieve a cooling effect.

As shown in Figure 4a, when the first electromagnetic valve 16 is opened and the second electromagnetic valve 18 is closed, the heat exchanger 8 in the evaporating section of the heat pipe, the heat exchanger 7 at the cooling end, the liquid storage tank 10 and the working The mass pump 11 forms a heat transfer system (that is, a heat pipe system) between the outdoor main unit 100 and the indoor unit using a refrigeration system. The second working fluid (CO ₂ ) only enters the cooling end heat exchanger 7 for condensation (due to the high pressure and resistance in the heat exchanger 1 of the heat pipe condensation section, the second working fluid will not pass through the heat pipe condensation section heat exchanger 1).

At the same time, the air flow path of the cold air channel is shown in Figure 4b. The first bypass ventilation valve 20 is opened and the second bypass ventilation valve 21 is closed. Heat exchange is completed by the condenser 5, that is, most of the cold air passes through the first bypass air valve 20 with less air resistance, and a small part of the cold air passes through the heat pipe condensation section heat exchanger 1 (only passes through without heat exchange); In this way, the total cross-sectional area of air circulation is increased, which effectively reduces the wind resistance and saves the energy consumption of the fan. At this time, the second bypass ventilation valve 21 is closed, so that all the air flows through the condenser 5 of the refrigeration system.

Due to the use of the phase-change heat isothermal and heat conduction properties of the second working substance (CO ₂ ), the heat exchange temperature difference between the indoor coil and the heat exchanger 7 at the refrigeration end can be maintained at a low level, so that the refrigeration system can be operated at a relatively low temperature. High evaporating temperature operates efficiently, and because of the integrated design of the refrigeration system, there is no long-term piping loss, on-site installation and non-standard loss of pumping and filling, and there is no need to consider oil return, low temperature and other issues, which is more efficient and reliable.

2. When the outdoor temperature is low (such as <10°C), the system can directly use the outdoor air as a low-temperature cold source. At this time, the refrigeration system is closed, and the second working medium in the heat pipe system is directly condensed in the heat exchanger 1 of the heat pipe condensation section . In this mode, only a small amount of fan and working fluid pump energy consumption is required, which is the most energy-saving.

As shown in Figure 5a, when the first electromagnetic valve 16 is closed and the second electromagnetic valve 18 is opened, the heat exchanger 8 in the heat pipe evaporating section, the heat exchanger 1 in the condensing section of the heat pipe, the liquid storage tank 10 and the The working medium pump 11 forms a heat transfer system (ie, a heat pipe system) between the outdoor main unit 100 and the indoor unit using the heat pipe condensation section heat exchanger 1;

At the same time, the air flow path of the cold air channel is shown in Figure 5b, the second bypass air valve 21 is opened, the first bypass air valve 20 is closed, and the cold air entering from the air inlet 2 of the external unit passes through the heat exchanger 1 of the condensation section of the heat pipe Heat exchange, take away the heat in the heat pipe system, and then mainly discharge it through the second bypass ventilation valve 21; because the condenser 5 is not closed, the gap between its fins can still pass through the airflow, so some air will also flow through the condensation Device 5 (only passing through without exchanging heat, because the refrigeration system is closed), so that the total air circulation cross-sectional area increases and reduces wind resistance.

3. When the season is transitional and the temperature is between the two, the outdoor temperature alone is not enough to discharge all the heat, and the refrigeration system is required to assist in heat dissipation. The second working fluid first enters the heat exchanger in the condensation section of the heat pipe for precooling, and then passes through the heat exchanger 7 at the cooling end to continue to condense.

As shown in Figure 6a, when the first and second electromagnetic valves 16 and 18 are closed at the same time, the heat exchanger 8 in the evaporation section of the heat pipe, the heat exchanger 1 in the condensation section of the heat pipe, and the heat exchanger 7 in the refrigeration end , the liquid storage tank 10 and the working medium pump 11 form a heat transfer system (that is, a heat pipe system) between the outdoor main unit 100 and the indoor unit using the refrigeration system and the heat pipe condensation section heat exchanger 1 at the same time.

At the same time, the air flow path of the cold air passage is shown in Figure 6b, the first bypass ventilation valve 20 and the second bypass ventilation valve 21 are closed, and the cold wind entering the air inlet 2 of the external unit first passes through the condensation section of the heat pipe for heat exchange After exchanging heat in the condenser 1, the heat is exchanged through the condenser 5 again.

In this mode, the outdoor air always flows through the heat exchanger 1 in the heat pipe condensing section, which can maximize the full efficiency of the outdoor cold source. Although the heat exchanger in the heat pipe condensing section recycles the cold energy in the fresh air, it will cause the air to heat up, but due to the transition season The temperature difference is small, so the temperature rise is limited, and the original inlet air temperature is much lower than the standard working condition, so the temperature rise will not affect the refrigeration system. In fact, when a conventional computer room air conditioner operates in transitional seasons, in order to prevent the condensation pressure from being too low, it must also adopt the method of forcing the fan to slow down to suppress the condensation effect, so the air flow design of this mode is also quite clever and effective.

The above-mentioned heat transfer system (heat pipe system) circulates a second working fluid, and the second working fluid is R744 (that is, CO ₂ working fluid).

The cooling principle of the heat pipe system is as follows: the indoor heat pipe fan 9 makes the air in the machine room forced to circulate, and continuously flows through the heat exchanger 8 of the heat pipe evaporation section, and the liquid _CO2 in the coil evaporates and absorbs heat, which reduces the air temperature and produces a cooling effect. And the gaseous CO ₂ enters the heat exchanger 7 at the cooling end and/or the heat exchanger 1 at the condensation section of the heat pipe in the outdoor main unit 100 through pipelines. After CO ₂ condenses into liquid, it enters the liquid storage tank 10, and then enters the working medium pump 11, and the working medium pump 11 with extremely low power consumption transports the liquid CO ₂ to the end of the room (that is, the indoor heat pipe device 200 heat pipe evaporation section heat exchanger 8 in the coil), so it goes round and round.

In addition to the CO ₂ working fluid, the second working fluid can also use various phase change working fluids, such as conventional phase change refrigerant working fluids: R410A, R22, R134a and so on.

Of course, the air flow path structure management design of the first and second bypass ventilation valves 16, 18 in the cold air passage in the outdoor main unit 100 can also be designed separately according to the specific environment and design ideas, or even no bypass ventilation valve is provided. As long as the refrigeration system and/or the heat pipe system can be switched as the cooling source through the first and second electromagnetic valves, the heat exchanger 1 and the condenser 5 in the condensation section of the heat pipe can work normally in the cold air passage.

Further, in order to avoid reverse flow from the first heat recovery pipeline to the direction of the compressor, a one-way valve 23 may also be arranged in series between the first heat recovery pipeline and the exhaust port of the compressor.

In order to further save energy consumption and expand the scope of utilizing natural cold sources, a spraying device 22 is arranged at the initial section of the air passage area of the outdoor main unit 100 close to the air inlet 2 of the outdoor unit, as shown in FIG. 7 , along the direction of ventilation. The spray device 22 is arranged before the condenser 5 and the heat exchanger 1 in the condensation section of the heat pipe; the spray device 22 includes a water storage box 221, a booster water pump 222, an atomizing nozzle 223 and a water pan 224. The water storage box 221 is connected to the water supply pipeline through the water supply valve 225, the atomizing nozzle 223 is connected to the water storage box 221 through the booster pump 222, and the water tray 224 is arranged below the atomizing nozzle 223 And be connected with described water storage box 221, after collecting unnecessary water droplet, collect in described water storage box 221 again.

In natural cooling or mixed mode, the humidification function can significantly reduce the inlet air temperature, while in cooling mode, this function can significantly reduce the high pressure of the refrigeration system and save energy consumption of the compressor.

This function expands the temperature range of the outdoor cold source. The following is a brief calculation description:

It is known that spray humidification (or wet film humidification) is an isenthalpic humidification and cooling process. Set the available outdoor temperature range of the unit without humidification function to <22°C; set the relative humidity of the outdoor air to 50%, and set the spray humidification to increase the relative humidity of the incoming air to 90%.

From the above conditions, it can be seen that the air state point after humidification is: dry bulb temperature = 22°C, enthalpy value = 60.2kj/kg.

From the enthalpy and relative humidity, the air inlet state point can be obtained: dry bulb temperature = 28.6°C.

That is to say, when the relative humidity of the air is 50%, its temperature utilization range can be increased to <28.6°C. If the climate is dry, it will get better utilization effect.

In the cooling mode, the approximate condensing temperature is reduced by 6.6°C, and the energy consumption of the compressor is reduced to about 87% of the original.

Of course, the use of the humidification function has its limitations, and it must consume water resources and must be applied in dry climate areas. Due to the difference in use environment and design schemes, the spray device 22 may not be provided.

The above-mentioned refrigeration system can also adopt other refrigeration methods such as adsorption, magnetic refrigeration, absorption, etc., in short, as long as the function of the refrigeration system is to realize the non-spontaneous transfer of heat from the low-temperature side to the high-temperature side through input energy (electric energy or thermal energy, etc.). As long as the low-temperature side in the refrigeration system is the cooling end heat exchanger 7, the high-temperature side of the refrigeration system and the heat pipe condensation section heat exchanger 1 are arranged in the air passage area, and can be heated with the cold wind in the cold air passage. exchange; and the first working medium channel of the heat exchanger 7 at the refrigeration end is serially arranged in the pipeline of the refrigeration system as the low temperature side of the refrigeration system.

The above-mentioned solenoid valve can also be other conventional cut-off valves, as long as the switching state of the working fluid flow channel of the pipeline at the switching location can be controlled by opening and closing the cut-off valve, and even the cut-off valve can be manually controlled. .

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (9)

1. A full-effect multi-mode energy-saving air-conditioning system, including an outdoor host and an indoor unit, is characterized in that: the outdoor host includes a complete set of refrigeration system and heat pipe condensation section heat exchanger; the space function of the outdoor host The area is divided into the main unit area and the air channel area; the air inlet of the outdoor unit is arranged on the outdoor main unit shell close to the main unit area in the air channel area, and the external fan is arranged at the end of the air channel area away from the main unit area, from The cold air passage of the outdoor main unit is formed from the air inlet of the external unit to the external fan; The refrigeration system includes a high-temperature side and a low-temperature side, and the low-temperature side is a heat exchanger at the cooling end; The high-temperature side of the refrigeration system and the heat exchanger in the condensation section of the heat pipe are arranged in the air passage area, and can exchange heat with the cold air in the cold air passage; The heat exchanger at the cooling end is provided with a first working medium channel and a second working medium channel capable of exchanging heat with each other, and the first working medium channel is provided with a first working medium channel inlet and a first working medium channel outlet, The second working medium channel is provided with a second working medium channel inlet and a second working medium channel outlet; the first working medium circulates in the refrigeration system; the first working medium channel is arranged in series in the refrigeration system In the pipeline as the low temperature side of the refrigeration system; The indoor unit is at least one indoor heat pipe device, and the indoor heat pipe device includes a heat exchanger in the evaporating section of the heat pipe and an indoor heat pipe fan; The outdoor host is also provided with a liquid storage tank and a working medium pump; the outlet of the liquid storage tank is connected to the inlet of the working medium pump, and the inlet of the liquid storage tank is exchanged with the cooling end through the first heat pipe. The outlet of the second working medium of the heater is connected, the outlet of the working medium pump is connected with the working medium inlet of the heat pipe evaporation section heat exchanger in the indoor heat pipe device, and the heat pipe evaporation section heat exchanger in the indoor heat pipe device The outlet of the working fluid communicates with the second inlet of the cooling end heat exchanger through a second heat pipe; The working fluid inlet of the heat pipe condensing section heat exchanger communicates with the second heat pipe through the third heat pipe, and its connection forms a first heat pipe tee point; the working medium outlet of the heat pipe condensing section heat exchanger passes through The fourth heat pipe is in communication with the second heat pipe, and its connection forms a second heat pipe tee point, and the second heat pipe is provided with a first heat pipe in series between the first and second heat pipe tee points. Cut-off valve; the second heat pipe pipe between the tee point of the second heat pipe and the second working fluid inlet of the cooling end heat exchanger passes through the fifth heat pipe pipe and the first heat pipe pipe connected, a second cut-off valve is arranged in series on the fifth heat pipe; When the first cut-off valve is opened and the second cut-off valve is closed, the outdoor main unit and Heat transfer system between indoor units; When the first shut-off valve is closed and the second shut-off valve is opened, the heat exchanger using the heat pipe condensation section heat exchanger is formed by the heat pipe evaporation section heat exchanger, the heat pipe condensation section heat exchanger, the liquid storage tank and the working fluid pump. a heat transfer system between the outdoor host and the indoor unit; When the first and second cut-off valves are closed at the same time, the simultaneous use refrigeration system is formed by the heat exchanger of the heat pipe evaporation section, the heat exchanger of the heat pipe condensation section, the heat exchanger of the refrigeration end, the liquid storage tank and the working medium pump. and the heat transfer system between the outdoor main unit and the indoor unit of the heat pipe condensation section heat exchanger; The heat transfer system circulates the second working fluid. 2. The air conditioning system according to claim 1, characterized in that: the refrigeration system includes a compressor, a condenser, an expansion valve, and a heat exchanger at the refrigeration end arranged in series; the high temperature side of the refrigeration system is a condensation device; the compressor has an exhaust port and a gas return port, the inlet of the first working medium channel is connected with the expansion valve, and the outlet of the first working medium channel is connected with the gas return port of the compressor. 3. The air conditioning system according to claim 2, characterized in that: in the cold air channel, the heat exchanger and the condenser in the condensation section of the heat pipe are arranged in sequence along the direction from the air inlet of the external unit to the external fan Setting, a first bypass ventilation valve is arranged on the side of the heat exchanger in the condensation section of the heat pipe, and the space on both sides of the cold air passage can be separated by the heat exchanger in the condensation section of the heat pipe and the first bypass ventilation valve; The side of the condenser is provided with a second bypass ventilation valve, and the space on both sides of the cold air passage can be separated by the condenser and the second bypass ventilation valve; When the first shut-off valve is opened and the second shut-off valve is closed, the first bypass ventilation valve is opened and the second bypass ventilation valve is closed at the same time. Heat exchange through the condenser; When the first shut-off valve is closed and the second shut-off valve is opened, the second bypass ventilation valve is opened and the first bypass ventilation valve is closed at the same time, and the cold air entering from the air inlet of the external unit passes through the heat exchanger in the condensation section of the heat pipe After heat exchange, it is mainly discharged through the second bypass ventilation valve; When the first and second cut-off valves are closed at the same time, the first bypass valve and the second bypass valve are also closed at the same time, and the cold air entering the air inlet of the external unit first passes through the condensation section of the heat pipe for heat exchange. After exchanging heat through the condenser, the heat is exchanged through the condenser. 4. The air conditioning system according to claim 1, characterized in that: the second working fluid is R744. 5. The air conditioning system according to any one of claims 1 to 4, characterized in that: a regenerator is also provided, and the regenerator is provided with a first regenerating pipeline and a second regenerating pipeline capable of exchanging heat with each other. The heat recovery pipeline, the first heat recovery pipeline is arranged in series on the pipeline between the exhaust port of the compressor and the condenser, and the second heat recovery pipeline is connected in series with the heat exchanger at the cooling end On the pipeline between the outlet of the first working medium channel and the gas return port of the compressor. 6. The air conditioning system according to claim 5, characterized in that a check valve is arranged in series between the first heat recovery pipeline and the exhaust port of the compressor to prohibit Reverse flow of the heat pipe to the direction of the compressor. 7. The air conditioning system according to any one of claims 1 to 4, characterized in that: a spraying device is provided at the initial section of the air passage area of the outdoor main unit close to the air inlet of the outdoor unit, and along the ventilation direction The spraying device is arranged before the condenser and the heat exchanger in the condensing section of the heat pipe; the spraying device includes a water storage box, a booster pump, an atomizing nozzle and a water pan, and the water storage box is connected to the water supply pipeline through a water supply valve. connected, the atomizing nozzle communicates with the water storage box through the booster pump, the water pan is set under the atomizing nozzle and connected to the water storage box, and collects excess water droplets and then reassembles into the water storage box. 8. The air conditioning system according to claim 5, characterized in that: a spraying device is provided at the initial section of the air passage area of the outdoor main unit close to the air inlet of the outdoor unit, and the spraying device is provided on the Before the condenser and the heat exchanger in the condensation section of the heat pipe; the spray device includes a water storage box, a booster pump, an atomizing nozzle and a water pan, and the water storage box is connected with the water supply pipeline through a water replenishment valve; The atomization spray head communicates with the water storage box through the booster pump, and the water pan is arranged under the atomization spray head and connected with the water storage box, collects excess water droplets and recollects them to the water storage box middle. 9. The air conditioning system according to any one of claims 1 to 4, characterized in that the first and second cut-off valves are electromagnetic valves.