CN205717833U - Annular heat pipe array heat exchanger and comprise its heat-exchange system - Google Patents

Abstract

A kind of annular heat pipe array heat exchanger, including condensation end and evaporation ends, described condensation end and evaporation ends all include the horizontal pipeline of multichannel；Described heat exchanger also includes two manifold pipelines, said two manifold pipeline is oppositely arranged, and each manifold pipeline is connected to the horizontal pipeline of condensation end and evaporation ends, forming multiple closed circuit, two manifold pipelines are respectively the first manifold pipeline and the second manifold pipeline.And the heat-exchange system containing this heat exchanger.This annular heat pipe array heat exchanger, utilizes the condition that autumn and winter season in spring outdoor temperature is relatively low, under the conditions of consumption power is less, the heat of interior volume is transferred to outdoor, saves a large amount of air conditioning energy consumption, can be applicable to the heat exchange of data center or interior of equipment cabinet.

Description

Annular heat pipe array heat exchanger and heat exchange system containing it

technical field

The utility model relates to the field of heat exchange, and further relates to an annular heat pipe array heat exchanger and a heat exchange system including the heat exchanger.

Background technique

The energy consumption of data centers or communication cabinets is large and concentrated (the energy consumption per unit area is much higher than that of office buildings), 24 hours of uninterrupted operation, and the annual operating hours are much higher than other commercial buildings. With global warming and energy shortages, the problem of efficient energy utilization has become increasingly prominent. How to reduce power utilization efficiency (power utilization efficiency = total facility power/IT equipment power) has become the goal pursued by data center operation managers.

According to the operation requirements of the equipment, the data center or the communication cabinet needs to ensure the reliable operation of the system in an environment-controlled space, among which, the most important thing is to operate the temperature environment within the range of 20-25 ℃, and keep the internal environment clean . At present, the most common way is to use air conditioning or thermoelectric cooling device.

For data centers, high-power air conditioners are generally used and automatic temperature control devices are installed to adjust the temperature of the data center. As the heat dissipation of the host system increases, the power of the air conditioner increases. If there is a fault, the air supply mode of downward air supply and upward return air is generally adopted in the computer room. There is a perforated floor at the front of each cabinet for cooling air. In addition, the air conditioner in the computer room must also ensure that the computer room has good air flow, there are no local hot spots and wind short circuits, and the temperature difference between different locations in the computer room is small.

For communication cabinets, in addition to using air conditioners for cooling, thermoelectric cooling (TEC) itself has no moving parts, no refrigerant pollution, simple structure and high integration, so it is also widely used in communication cabinets. However, the power of a single TEC is very small. In the application of the communication cabinet, the TECs need to be connected in series and parallel and combined into a stack for use. During use, the cooling fins and fans installed on the cold side of the TEC are placed inside the communication cabinet, and the cooling fins and fans installed on the hot side of the TEC are placed outside the communication cabinet, thereby controlling the temperature inside the communication cabinet.

Heat pipes have been widely used in current high-efficiency heat transfer devices. As shown in Figure 1, the existing technology provides a heat pipe heat exchanger for cooling the machine room, using independent evaporation ends and condensation ends, and evaporation ends and condensation ends. A conduit forming a circulation path is connected between the ends, and a heat pipe medium is arranged in the conduit. Therefore, the lower ambient temperature in winter and spring and autumn can be effectively utilized.

It can be seen from the above technical solutions that no matter whether a high-power air conditioner or a TEC is used to control the temperature of the equipment, a large amount of electric energy is consumed. In addition, due to the low thermoelectric conversion efficiency of TEC, the energy utilization efficiency of this cooling method is low. In order to achieve the required load, many TECs need to be used in series and parallel, the system is complicated and the reliability is low.

In the colder spring, autumn and winter, due to the low outdoor temperature, the indoor and outdoor temperature difference can be used to transfer the indoor heat to the outdoor without consuming power, saving the power consumption of the air conditioner. However, due to the requirements of cleanliness, it is not possible to directly exchange indoor and outdoor air, but it is necessary to use efficient heat transfer equipment such as heat pipes.

The heat pipe heat exchanger that separates the evaporating end and the condensing end adopts the method of connecting pipes. All the steam generated at the evaporating end is transported through the connecting pipes, resulting in increased flow resistance; the steam starts to condense at the entrance of the condensing side. There is less steam at the bottom, resulting in uneven temperature distribution of the condenser side, which cannot make good use of the heat exchange capacity of the condenser side. On the other hand, if the area of the machine room is large, the distance between the evaporation end and the condensation end is relatively long, resulting in an increase in the length of the connecting pipe, which will also increase the thermal resistance. If the thermal resistance of the heat pipe heat exchanger increases, it means that the temperature difference between the evaporating end and the condensing end increases, and the heat pipe heat exchanger can only be used in a lower outdoor temperature environment, resulting in a reduction in the number of available days throughout the year and a reduction in energy saving effect .

Utility model content

In view of this, the purpose of the present utility model is to provide an annular heat pipe array heat exchanger and a heat exchange system comprising it.

In order to achieve the above purpose, according to one aspect of the present invention, there is provided an annular heat pipe array heat exchanger, including a condensation end and an evaporation end, wherein:

Both the condensation end and the evaporation end include multiple horizontal pipelines;

The heat exchanger also includes two multi-pass pipelines, the two multi-pass pipelines are arranged oppositely, and each multi-pass pipeline is connected to the horizontal pipelines at the condensing end and the evaporating end, so that the heat exchanger forms Multiple closed loops, the two multi-way pipelines are respectively the first multi-way pipeline and the second multi-way pipeline.

According to a specific embodiment of the present invention, the multi-channel horizontal pipeline at the evaporation end includes an upper pipeline at the evaporation end, and at least part of the upper pipeline at the evaporation end is configured such that one end is connected to the first multi-way pipeline, At the evaporation end, the other end is connected to the second multi-way pipeline through one or more turns.

According to a specific embodiment of the present invention, the multi-channel horizontal pipeline at the condensing end includes a lower pipeline at the condensing end, and at least part of the lower pipeline at the condensing end is configured such that one end is connected to the second multi-way pipeline , the other end is connected to the first multi-pass pipeline through one or more turns at the condensing end.

According to a specific embodiment of the present invention, a vertically arranged main pipe is also included, and the main pipe communicates with the plurality of closed loops, so that the plurality of closed loops realize medium exchange.

According to a specific embodiment of the present utility model, the main pipe is arranged between the first multi-way pipeline and the condensation end, or between the second multi-way pipeline and the condensation end, and the main pipe is provided with a replacement Heat medium filling port; preferably, part of the multi-way pipeline has an inclination angle of 1-30° with respect to the horizontal direction.

According to a specific embodiment of the present invention, the horizontal pipeline at the condensing end is connected to the main pipe through a connection pipeline with increased height, so as to prevent the condensate from entering the main pipe.

According to a specific embodiment of the present invention, it further includes a plurality of vertical main pipes, respectively communicating with part of the plurality of closed loops.

According to one aspect of the present invention, there is provided an annular heat pipe array heat exchanger, including a condensation end and an evaporation end, wherein:

Both the condensation end and the evaporation end include multiple horizontal pipelines;

It also includes N groups of 2N multi-pass pipelines arranged opposite to each other, and each multi-pass pipeline is connected to the horizontal pipelines at the condensation end and the evaporation end to form N groups of closed loops;

It also includes N vertically arranged main pipes, each of which is in communication with each of the closed loops, wherein N is a natural number greater than 2.

According to a specific embodiment of the present invention, the multi-channel horizontal pipelines at the condensing end and the evaporating end are distributed in inner and outer layers.

According to one aspect of the present invention, there is provided a heat exchange system for a communication cabinet or a computer center, including any one of the above annular heat pipe array heat exchangers, and preferably also includes an air duct for collecting heat, and the end of the air duct Lead to the evaporation end of the annular heat pipe array heat exchanger of the heat exchange system.

Through the above technical scheme, the beneficial effects of the utility model are:

(1) By setting relative multi-pass pipelines between the evaporating end and the condensing end, the steam can flow to the condensing end in two directions, and the flow resistance of the steam is greatly reduced;

(2) By setting up an annular heat pipe array heat exchanger with a main pipe, taking advantage of the low outdoor temperature in spring, autumn and winter, and under the condition of less power consumption, the heat inside the space is transferred to the outside, thus saving a lot of energy. The energy consumption of the air conditioner is low, and there is no exchange of internal and external air during the heat transfer process, which ensures the cleanliness of the data center or the inside of the cabinet;

(3) Compared with the system with air conditioner or TEC, the system saves electric energy, has simple structure and high reliability.

(4) The part in contact with the main pipe has a pipeline with a height gradually rising (especially a B-shaped structure), thereby preventing the condensate from entering the main pipe, falling to the bottom of the main pipe under the action of gravity, and all accumulating To the bottom of the evaporation end, it affects the heat pipe heat exchanger, and also partially avoids the increase of flow resistance caused by the reverse flow of vapor and liquid. The above designs all reduce the thermal resistance of the system;

(5) By setting up an array of annular heat pipe heat exchangers with parent pipes, the steam can diffuse in the entire heat exchanger. In places where the temperature of the cold source is low, the pressure difference between the evaporation end and the condensation end is large, the condensation is also large, and the temperature is uniform Good performance, adapt to local heat changes, and have a strong ability to adapt to uneven distribution of cold and heat sources;

(6) The heat pipe arrays share one filling port, only need to be filled once, the filling process is simple, and the cost is greatly reduced. Due to the large internal volume, the filling rate accuracy is easy to guarantee, which brings convenience to industrial design and manufacturing;

(7) For a computing center with a large area, the heat generated by each cabinet is collected by installing an air duct, and the heat pipe heat exchanger is designed for centralized processing, which overcomes the increase in thermal resistance due to the increase in the length of the connecting duct ;

(8) In addition to being used for cooling equipment such as communication cabinets, communication base stations, server cabinets, and server rooms, it can also be used for waste heat recovery in HVAC, chemical, energy and other industries.

Description of drawings

Fig. 1 is a kind of heat exchanger in the prior art.

Fig. 2 is a schematic diagram of an annular heat pipe array heat exchanger according to an embodiment of the present invention.

Fig. 3 is a three-dimensional view of an annular heat pipe array heat exchanger according to an embodiment of the present invention.

Fig. 4 is a structural schematic diagram of an annular heat pipe array with hidden fins according to an embodiment of the present invention.

Fig. 5 is an enlarged perspective view showing the connection relationship between the condensation end and the main pipe in Fig. 4 .

Fig. 6 is an enlarged schematic cross-sectional view of the connection relationship between the condensation end and the main pipe in Fig. 4 .

Fig. 7 is a three-dimensional view of an annular heat pipe array heat exchanger according to another embodiment of the present invention.

Fig. 8 is a three-dimensional view of an annular heat pipe array heat exchanger according to another embodiment of the present invention.

Fig. 9 is a three-dimensional view of an annular heat pipe array heat exchanger according to another embodiment of the present invention.

Fig. 10 is a schematic diagram of a large-scale heat exchange system according to an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. In the specification, the same or similar reference numerals designate the same or similar components. The following descriptions of the embodiments of the utility model with reference to the accompanying drawings are intended to explain the overall utility model concept of the utility model, and should not be construed as a limitation of the utility model.

According to the overall utility model idea of the utility model, an annular heat pipe array heat exchanger is provided, which includes a condensation end and an evaporation end, and realizes multi-loop heat exchange through two multi-pass pipelines arranged oppositely. The arrangement of each component will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 2, the high-temperature air in the heat source 2 (such as a communication cabinet) first passes through the evaporation end 101 of the annular heat pipe array heat exchanger 1 (hereinafter referred to as: heat pipe heat exchanger), and the evaporation end 101 of the heat pipe absorbs the air carried by the high-temperature air. The working fluid in the heat pipe absorbs heat and then evaporates, entering the condensation end 102. In the condensation end, the working fluid is condensed and released to the low-temperature air outside the cabinet, thereby realizing the exchange of heat inside and outside the communication cabinet, and no internal and external air exchange. The application of the heat pipe saves the electricity consumption of the air conditioner or TEC while ensuring the temperature in the cabinet.

Figure 3 is a three-dimensional view of the heat pipe heat exchanger, and Figure 4 is a ring circuit with heat exchange fins hidden. The heat pipe heat exchanger can be composed of an annular heat pipe array with a parent pipe.

FIG. 4 is a structural diagram of a heat pipe array, which consists of an upper pipeline 103 - 1 , a middle pipeline 103 - 2 , a lower pipeline 103 - 3 and a main pipe 104 . In the part with fins in the evaporating end 101 and the condensing end 102, the internal pipeline is in a horizontal state, while the parts of the pipelines 103-a and 103-b connecting the evaporating end 101 and the condensing end 102 are in a horizontal direction. The inclination angle of 1°-30° ensures the smooth return of condensed liquid. One more return journey is made on the evaporation end side of the uppermost pipeline 103-1 of the heat pipe heat exchanger 1, and one more return journey is taken on the condensation end side of the lowermost pipeline 103-3 of the heat pipe heat exchanger 1, thereby increasing the The heat exchange area of the evaporating end 101 and the condensing end 102 in the heat pipe heat exchanger.

A connecting main pipe 104 is installed on the loop 103 to connect the pipelines 103-1, 103-2, and 103-3 to form a connected whole. A sealing port for vacuuming and liquid injection is installed on the main pipe 104 . Pipelines 103-1, 103-2, and 103-3 pass through a B-shaped structure (shown in Figure 5 and Figure 6) after coming out of the condensing end, so that the height difference h on both sides reaches or exceeds the pipe diameter, and is connected with the main pipe connected. As shown in Figure 5, the main purpose of designing a structure with a certain height difference on both sides is to prevent the condensate from entering the main pipe when it flows back, and all fall to the bottom of the main pipe, causing the working fluid to not be evenly distributed inside the evaporator.

The packaging process and working mechanism of the heat pipe heat exchanger are:

(1) Ultrasonic cleaning is performed on the heat pipe heat exchanger 1 to remove oil stains on the surface.

(2) Put the heat pipe heat exchanger 1 into a high-temperature drying oven to remove moisture inside the heat pipe heat exchanger.

(3) Vacuum through the sealing port on the main pipe. When the pressure inside the system is less than 1Pa, turn off the vacuum pump and keep the heat pipe heat exchanger 1 in a vacuum state.

(4) Encapsulate a certain amount of liquid working fluid in the heat pipe heat exchanger, these working fluids can be: ethanol, R134a, R22, R410a, R113 and other organic working fluids or Freon-like working fluids, according to the thermal physical properties of the working fluid The liquid filling rate is between 20% and 80%.

The phase change process of the working fluid in the heat pipe heat exchanger 1 is as follows:

The working fluid absorbs heat and evaporates in the evaporating end 101, and is transported to the condensing end through the connecting pipelines 103-a and 103-b between the evaporating end and the condensing end. The way of connection, in the double-sided connecting pipelines of 103-a and 103-b, each loop corresponds to two connecting pipelines, steam can flow to the condensation end in two directions, and the flow resistance of steam is greatly reduced Small. After the liquid is condensed in the condensing end, it flows back to the evaporating end through 103-a, but there is no reflux of condensate in 103-b. This is because the part of 103-b in contact with the main pipe has a B-shaped structure, thus avoiding The condensate enters the main pipe, falls to the bottom of the main pipe under the action of gravity, and all accumulates at the bottom of the evaporating end, which affects the performance of the heat pipe heat exchanger 1, and also partly avoids the increase of flow resistance caused by the reverse flow of vapor and liquid .

1. According to the heat dissipation load and different requirements, the number of loops forming the heat pipe array can be adjusted.

2. According to the heat dissipation load and different requirements, as shown in Fig. 7, the above implementation scheme can be designed as a structure of inner and outer double-layer loops or multi-layer loops.

3. When it is designed as an inner and outer double-layer loop or a multi-layer loop, as shown in Figure 8, it is possible to share a thick mother pipe or an equivalent square cavity.

4. When designing a double-loop or multi-loop structure, as shown in Figure 9, the upper, middle and lower sections can share the main pipe or square cavity respectively.

Based on the same concept of the utility model, the utility model provides a heat exchange system for a communication cabinet or a computer center.

In the implementation of the small heat exchange system, for example, it is oriented to the heat dissipation of the cabinet. Due to the small size of the cabinet, the air distribution inside the cabinet can be realized by relying on the fan on the evaporating end of the heat pipe heat exchanger. For large-scale heat dissipation systems, such as heat exchange in data centers, many groups of similar cabinets will be stored. If similar heat pipe heat exchangers are installed on each rail, the system will be complicated and installation will be difficult. In this embodiment, the heat generated by each cabinet is collected through the air duct, and the heat generated by the heat pipe heat exchanger is used for centralized processing.

As shown in Figure 10, the heat released by the heat sources 2 (such as cabinets) at different positions is collected through the air duct 3, and the heat is exchanged with the outside through the heat pipe heat exchanger 1. The direction of the arrow in the figure is the direction of hot air flow.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above descriptions are only specific embodiments of the utility model and are not intended to limit the utility model. For new models, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims (11)

1. An annular heat pipe array heat exchanger, comprising a condensation end and an evaporation end, characterized in that: Both the condensation end and the evaporation end include multiple horizontal pipelines; The heat exchanger also includes two multi-pass pipelines, the two multi-pass pipelines are oppositely arranged, and each multi-pass pipeline is connected to the horizontal pipelines at the condensation end and the evaporation end, so that the heat exchanger forms a multi-pass pipeline. A closed loop, the two multi-way pipelines are the first multi-way pipeline and the second multi-way pipeline. 2. The annular heat pipe array heat exchanger according to claim 1, wherein the multi-channel horizontal pipelines at the evaporating end include the upper pipeline at the evaporating end, and at least part of the upper pipeline at the evaporating end is provided with One end is connected to the first multi-way pipeline, and the other end is connected to the second multi-way pipeline through one or more turns at the evaporation end. 3. The annular heat pipe array heat exchanger according to claim 1, wherein the multi-channel horizontal pipelines at the condensing end include a lower pipeline at the condensing end, and at least part of the lower pipeline at the condensing end is provided with One end is connected to the second multi-way pipeline, and the other end is connected to the first multi-way pipeline through one or more turns at the condensing end. 4. The annular heat pipe array heat exchanger according to claim 1, further comprising a vertically arranged main pipe, the main pipe communicates with the plurality of closed loops, so that the plurality of closed loops Implement media swapping. 5. The annular heat pipe array heat exchanger according to claim 4, wherein the main pipe is arranged between the first multi-pass pipeline and the condensation end, or is arranged between the second multi-pass pipeline and the condensation end In between, the main pipe is provided with a heat exchange medium filling port. 6. The annular heat pipe array heat exchanger according to claim 4, characterized in that, part of the first multi-pass pipeline and the second multi-pass pipeline have an inclination angle of 1-30° with respect to the horizontal direction . 7 . The annular heat pipe array heat exchanger according to claim 4 , wherein the horizontal pipeline at the condensing end is connected to the main pipe through a connection pipeline with increased height, so as to prevent condensate from entering the main pipe. 8 . 8 . The annular heat pipe array heat exchanger according to claim 1 , further comprising a plurality of vertical main pipes, respectively communicating with parts of the plurality of closed loops. 9. An annular heat pipe array heat exchanger, comprising a condensation end and an evaporation end, characterized in that: Both the condensation end and the evaporation end include multiple horizontal pipelines; It also includes N groups of 2N multi-pass pipelines arranged opposite to each other, and each multi-pass pipeline is connected to the horizontal pipelines at the condensation end and the evaporation end, so that the heat exchanger forms N groups of closed loops; It also includes N vertically arranged main pipes, each of which is in communication with each of the closed loops, wherein N is a natural number greater than 2. 10 . The annular heat pipe array heat exchanger according to claim 9 , wherein the multi-channel horizontal pipes at the condensation end and the evaporation end are distributed in multiple layers inside and outside. 11 . 11. A heat exchange system for a communication cabinet or a computer center, comprising the annular heat pipe array heat exchanger according to any one of claims 1-10, and also comprising an air duct for collecting heat, and the end of the air duct leads to The evaporation end of the annular heat pipe array heat exchanger of the heat exchange system.