A compact V-type condenser with a subcooling section

Abstract

This invention relates to a compact V-type condenser with a subcooling section, comprising a V-type heat exchanger and a condensing fan mounted above it. The V-type heat exchanger includes a heat exchanger 1 and a heat exchanger 2 arranged symmetrically and inclined. The V-type heat exchanger is divided into a heat exchange section near the condensing fan and a subcooling section away from the condensing fan. The refrigerant is connected through a manifold, which includes an exhaust manifold and a liquid collection manifold located in the heat exchange section, and a subcooling manifold and a return manifold located in the subcooling section. The refrigerant flows from the exhaust manifold through several heat exchange paths into the liquid collection manifold, then into the subcooling manifold, and finally into the return manifold through several more heat exchange paths. The subcooling section further subcools the already liquefied refrigerant. This invention, without increasing the condensing area, improves the internal heat exchange effect of the refrigerant simply by adjusting the refrigerant flow path, effectively increasing the utilization rate of the heat exchanger area, and has significant economic and promotional value.

Description

Technical Field

[0001] This invention relates to a compact V-type condenser with a subcooling section, belonging to the field of computer room air conditioning technology. Background Technology

[0002] In the data center cooling industry, room-level inverter air conditioners typically employ decentralized air-cooled units. These units consist of indoor and outdoor units (also known as condensers). Air-cooled computer room air conditioners are easy to install and layout, offering flexibility and convenience. Outdoor units can be installed on the roof or suspended from the building's exterior wall, hence their widespread use. Outdoor units are categorized into two types based on their structure: standard (vertical or horizontal) and compact (V-type or U-type, etc.). Since medium to large data centers often have limited outdoor unit installation space, compact condensers, which save floor space, are becoming increasingly popular.

[0003] A condenser is a type of heat exchanger that converts gas or vapor into liquid; its operation is exothermic. The V-type compact condenser is characterized by its small footprint, employing a V-shaped modular structure design that saves up to 70% of floor space. It also effectively reduces condensing pressure and outdoor fan power consumption, resulting in good energy savings. However, the current V-type condenser uses a side-intake, top-outtake airflow design. Air enters from both sides of the V-type heat exchanger, bends, and exits, resulting in low airflow at the bottom of the heat exchanger, far from the fan area. This leads to poor refrigerant heat exchange within the condenser and inefficient use of the heat exchanger area. Therefore, the performance of existing V-type condensers needs further improvement. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a compact V-type condenser with a subcooling section, the specific technical solution of which is as follows:

[0005] A compact V-type condenser with a subcooling section includes a condensing fan and a V-type heat exchanger. The V-type heat exchanger is floor-mounted, and the condensing fan is positioned above the top of the V-type heat exchanger. The condensing fan provides airflow to the V-type heat exchanger; air enters from the outside of heat exchanger one and heat exchanger two, flows to the inside, and is then blown out by the condensing fan. The V-type heat exchanger includes a heat exchange section close to the condensing fan and a subcooling section away from the condensing fan.

[0006] The refrigerant within the condenser is connected via manifolds, which include an exhaust manifold and a liquid collection manifold located in the heat exchange section, and a subcooling manifold and a return manifold located in the subcooling section. Both ends of the exhaust manifold are equipped with needle valves as pressure taps for the internal pressure of the condenser piping. The refrigerant flows from the exhaust manifold through several heat exchange paths into the liquid collection manifold, then into the subcooling manifold, and finally into the return manifold through several more heat exchange paths. Each heat exchange path consists of several U-shaped heat exchange tubes connected in series. The subcooling section further subcools the already liquefied refrigerant. The refrigerant enters from the inside of the heat exchange section, exits from the outside, then enters the inside of the subcooling section and exits from the outside. The heat exchange section and the subcooling section employ a uniform heat exchange process, with the refrigerant flowing counter-currently to the airflow.

[0007] Furthermore, the V-shaped heat exchanger includes a heat exchanger 1 and a heat exchanger 2 arranged symmetrically and inclined to the left and right, and connected and fixed as a whole by structural components for easy transportation and handling. The bottom of the V-shaped heat exchanger is far from the fan area, resulting in a lower airflow. Based on actual testing and theoretical calculations, the V-shaped heat exchanger is divided into four regions: A, B, C, and D. Region A is the low-velocity region of heat exchanger 1, far from the condenser fan; region B is the high-velocity region of heat exchanger 1, close to the condenser fan; region C is the low-velocity region of heat exchanger 2, far from the condenser fan; and region D is the high-velocity region of heat exchanger 2, close to the condenser fan. Regions B and D constitute the heat exchange section, and regions A and C constitute the subcooling section.

[0008] Furthermore, the exhaust manifold includes exhaust manifold one, exhaust manifold two, exhaust manifold three, and exhaust manifold four. Exhaust manifold one and exhaust manifold two are symmetrically arranged inside the heat exchange section. One end of exhaust manifold three is connected to exhaust manifold one, the other end is connected to exhaust manifold two, the middle part is connected to one end of exhaust manifold four, and the other end of exhaust manifold four is connected to the compressor.

[0009] Furthermore, the liquid collecting pipe includes a first liquid collecting pipe and a second liquid collecting pipe, which are symmetrically arranged on the outer side of the heat exchange section. The subcooling collecting pipe includes a first subcooling collecting pipe and a second subcooling collecting pipe, which are symmetrically arranged on the inner side of the subcooling section. The liquid collecting pipe and the subcooling collecting pipe located on the same side are integrally bent from copper pipe and connected.

[0010] Furthermore, the return liquid collection pipe has a "Y" shaped structure, including two symmetrical liquid inlet pipes and a liquid outlet pipe that connects to the indoor unit. The liquid inlet pipes are symmetrically arranged on the outside of the subcooling section and are all connected to the liquid outlet pipe.

[0011] Furthermore, the exhaust manifold and liquid collection manifold located on the same side of the heat exchange section are connected by nine heat exchange processes, each consisting of 12 U-shaped heat exchange tubes connected in series. The subcooling manifold and return liquid manifold located on the same side of the subcooling section are connected by three subcooling processes, each consisting of four U-shaped heat exchange tubes connected in series. The liquid collection manifold collects refrigerant liquid from the 18 heat exchange processes within the heat exchange section and flows into the subcooling manifold, which then distributes the refrigerant evenly to the six heat exchange processes within the subcooling section.

[0012] Furthermore, the exhaust manifold and liquid collection manifold located on the same side of the heat exchange section are connected by 14 heat exchange processes, each of which consists of 20 U-shaped heat exchange tubes connected in series. The subcooling manifold and return liquid manifold located on the same side of the subcooling section are connected by 4 subcooling processes, each of which consists of 6 U-shaped heat exchange tubes connected in series. The liquid collection manifold collects the refrigerant liquid from the 28 heat exchange processes in the heat exchange section and flows into the subcooling manifold, which then distributes the refrigerant evenly to the 8 heat exchange processes in the subcooling section.

[0013] Furthermore, the condenser fan adopts a stepless speed control device or EC electronic commutation DC frequency converter control, which can automatically adjust the speed of the condenser fan according to the pressure changes inside the condenser pipe to ensure the stability of the system condensing pressure and reduce the noise of the outdoor unit. The condensing resistance in the heat exchange section is less than 40 kPa, the subcooling degree is 5°C, and the single loop length of the condenser ranges from 15 meters to 30 meters.

[0014] Furthermore, the V-type heat exchanger uses 3 rows of internally threaded heat exchange tubes with an inner diameter of 7mm, a hole spacing of 19.05mm, a row spacing of 16mm, a tooth root thickness of 0.24mm, and a tooth height of 0.14mm.

[0015] Furthermore, the V-type heat exchanger uses aluminum fins with a fin wall thickness of 0.105 mm, a fin spacing of 1.5 mm, and a corrugated fin shape.

[0016] The beneficial effects of this invention are:

[0017] This invention improves the system's subcooling by changing the refrigerant flow path of the V-type condenser and designing the area far from the fan with low airflow as a subcooling section. This enhances the refrigerant condensation effect and improves the energy efficiency ratio of the refrigeration system.

[0018] Compared with existing technologies, this invention can improve the internal heat exchange effect of the refrigerant and effectively improve the heat exchanger area utilization rate by simply adjusting the refrigerant flow without increasing the condensation area. It has great economic and promotional value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention, wherein: A and C are subcooling sections, B and D are heat exchange sections, and the dashed lines are airflow traces;

[0020] Figure 2 This is a diagram showing the arrangement of the manifold of the present invention;

[0021] Figure 3 This is a refrigerant flow diagram for Example 1;

[0022] Figure 4 This is a refrigerant flow diagram for Example 2;

[0023] In the diagram, 1-condenser fan, 2-V-type heat exchanger, 2a-heat exchanger one, 2b-heat exchanger two, 3-exhaust manifold, 3a-exhaust manifold one, 3b-exhaust manifold two, 3c-exhaust manifold three, 3d-exhaust manifold four, 4-liquid collection manifold, 4a-liquid collection manifold one, 4b-liquid collection manifold two, 5-subcooling manifold, 5a-subcooling manifold one, 5b-subcooling manifold two, 6-return liquid manifold, 7-needle valve. Detailed Implementation

[0024] The invention will now be described in further detail with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the system includes a condenser fan 1 and a V-type heat exchanger 2. The V-type heat exchanger 2 is floor-mounted and comprises two symmetrically inclined heat exchangers, 2a and 2b, connected and fixed as a whole by structural components for easy transport and handling. The condenser fan 1 is positioned above the top of the V-type heat exchanger 2, providing airflow. The dashed lines represent the airflow path; air enters from the outside of heat exchangers 2a and 2b and flows to the inside before being blown out by the condenser fan 1.

[0026] The bottom of the V-type heat exchanger 2 is far from the fan area, resulting in a lower airflow. Based on actual testing and theoretical calculations, the V-type heat exchanger 2 is divided into four regions: A, B, C, and D. Region A is the low-velocity region of heat exchanger 2a, far from the condenser fan 1; region B is the high-velocity region of heat exchanger 2a, close to the condenser fan 1; region C is the low-velocity region of heat exchanger 2b, far from the condenser fan 1; and region D is the high-velocity region of heat exchanger 2b, close to the condenser fan 1. Regions B and D are the heat exchange sections, while regions A and C are the subcooling sections.

[0027] The condenser fan 1 adopts a stepless speed control device or EC electronic commutation DC frequency converter control, which can automatically adjust the speed of the condenser fan 1 according to the pressure changes inside the condenser pipe to ensure the stability of the system condensing pressure and reduce the noise of the outdoor unit. The condensing resistance in the heat exchange section is less than 40 kPa, the subcooling is 5℃, and the single loop length of the condenser should be 15-30 meters. The V-type heat exchanger 2 uses 3 rows of 7mm inner diameter internal thread heat exchange tubes, with a hole spacing of 19.05mm, a row spacing of 16mm, a tooth root thickness of 0.24mm, and a tooth height of 0.14mm. The V-type heat exchanger 2 uses aluminum fins with a fin wall thickness of 0.105mm, a fin spacing of 1.5mm, and a corrugated fin type.

[0028] The refrigerant inside the condenser is connected through a manifold, such as... Figure 2 As shown, the manifold includes an exhaust manifold 3, a liquid collection manifold 4, a subcooling manifold 5, and a return manifold 6. The exhaust manifold 3 and liquid collection manifold 4 are located in the heat exchange section, while the subcooling manifold 5 and return manifold 6 are located in the subcooling section. Refrigerant flows from the exhaust manifold 3 into the liquid collection manifold 4, and then sequentially into the subcooling manifold 5 and the return manifold 6. The subcooling section further subcools the already liquefied refrigerant. The refrigerant enters from the inside of the heat exchange section and exits from the outside, then enters the inside of the subcooling section and exits from the outside. The heat exchange section and the subcooling section employ a uniform heat exchange process, and the refrigerant flow direction is counter-current to the air flow direction.

[0029] The exhaust manifold 3 includes exhaust manifold 1 3a, exhaust manifold 2 3b, exhaust manifold 3c, and exhaust manifold 4 3d. Exhaust manifold 1 3a and exhaust manifold 2 3b are symmetrically arranged inside the heat exchange section. One end of exhaust manifold 3c is connected to exhaust manifold 1 3a, the other end is connected to exhaust manifold 2 3b, and the middle part is connected to one end of exhaust manifold 4 3d. The other end of exhaust manifold 4 3d is connected to the compressor. Both ends of exhaust manifold 3c are equipped with needle valves 7, which serve as pressure taps for the internal pressure of the condenser piping.

[0030] The liquid collection pipe 4 includes a first liquid collection pipe 4a and a second liquid collection pipe 4b, which are symmetrically arranged on the outer side of the heat exchange section. The subcooling collection pipe 5 includes a first subcooling collection pipe 5a and a second subcooling collection pipe 5b, which are symmetrically arranged on the inner side of the subcooling section. The liquid collection pipe 4 and the subcooling collection pipe 5, located on the same side, are integrally bent copper pipes and connected to each other. The return liquid collection pipe 6 has a "Y" shaped structure, including two symmetrical inlet pipes and an outlet pipe connecting to the indoor unit. The inlet pipes are symmetrically arranged on the outer side of the subcooling section and are all connected to the outlet pipe.

[0031] Example 1:

[0032] like Figure 3As shown, the exhaust manifold 3 and the liquid collection manifold 4, located on the same side of the heat exchange section, are connected by nine heat exchange processes, each consisting of 12 U-shaped heat exchange tubes connected in series. The subcooling manifold 5 and the return liquid manifold 6, located on the same side of the subcooling section, are connected by three subcooling processes, each consisting of four U-shaped heat exchange tubes connected in series. The liquid collection manifold 4 collects refrigerant liquid from the 18 heat exchange processes within the heat exchange section and flows into the subcooling manifold 5, which then distributes the refrigerant evenly to the six heat exchange processes within the subcooling section.

[0033] This embodiment uses a 3-row, 40-column configuration, with a heat exchange tube length of 2m and an air volume of 7500m³ / h. 3 The refrigerant flow rate is 300 kg / hr, the return air temperature is 35℃, the return air humidity is 30%RH, the refrigerant flow rate is 300 kg / hr, the heat exchange capacity is 15.2 kW, the air-side outlet temperature is approximately 41.5℃, and the refrigerant-side heat transfer coefficient using the subcooled section is 3973 W / m². 2 .k, without subcooling section, 3382W / m 2 Compared to no subcooling, an increase of 1°C in subcooling can improve the system's energy efficiency ratio by 0.1 W / W, which is 2.6%.

[0034] Example 2:

[0035] like Figure 4 As shown, the exhaust manifold 3 and the liquid collection manifold 4, located on the same side of the heat exchange section, are connected by 14 heat exchange processes, each consisting of 20 U-shaped heat exchange tubes connected in series. The subcooling manifold 5 and the return liquid manifold 6, located on the same side of the subcooling section, are connected by 4 subcooling processes, each consisting of 6 U-shaped heat exchange tubes connected in series. The liquid collection manifold 4 collects the refrigerant liquid from the 28 heat exchange processes within the heat exchange section and flows into the subcooling manifold 5. The subcooling manifold 5 then evenly distributes the refrigerant to the 8 heat exchange processes within the subcooling section.

[0036] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A compact V-type condenser with a subcooling section, characterized in that: The device includes a condenser fan (1) and a V-type heat exchanger (2). The V-type heat exchanger (2) is installed on the ground. The condenser fan (1) is located above the top of the V-type heat exchanger (2). The V-type heat exchanger (2) includes a heat exchange section close to the condenser fan (1) and a subcooling section away from the condenser fan (1). The refrigerant in the condenser is connected through a manifold. The manifold includes an exhaust manifold (3) and a liquid collection manifold (4) located in the heat exchange section, and a subcooling manifold (5) and a return liquid manifold (6) located in the subcooling section. The exhaust manifold (3) is equipped with a needle valve (7). The refrigerant flows from the exhaust manifold (3) through several heat exchange processes into the liquid collection manifold (4), then into the subcooling manifold (5), and then into the return liquid manifold (6) through several heat exchange processes. Each heat exchange process is composed of several U-shaped heat exchange tubes connected in series. The exhaust manifold (3) includes exhaust manifold one (3a), exhaust manifold two (3b), exhaust manifold three (3c) and exhaust manifold four (3d). Exhaust manifold one (3a) and exhaust manifold two (3b) are symmetrically arranged inside the heat exchange section. One end of exhaust manifold three (3c) is connected to exhaust manifold one (3a), the other end is connected to exhaust manifold two (3b), and the middle part is connected to one end of exhaust manifold four (3d). The other end of exhaust manifold four (3d) is connected to the compressor. The needle valve (7) is arranged at both ends of exhaust manifold three (3c). The liquid collecting pipe (4) includes a liquid collecting pipe one (4a) and a liquid collecting pipe two (4b), which are symmetrically arranged on the outside of the heat exchange section; the subcooling pipe (5) includes a subcooling pipe one (5a) and a subcooling pipe two (5b), which are symmetrically arranged on the inside of the subcooling section; the liquid collecting pipe (4) and the subcooling pipe (5) located on the same side are connected by integrally bent copper pipes.

2. The compact V-type condenser with a subcooling section as described in claim 1, characterized in that: The V-type heat exchanger (2) includes a heat exchanger 1 (2a) and a heat exchanger 2 (2b) arranged symmetrically and inclined to the left and right, and are connected and fixed by structural components. The V-type heat exchanger (2) is divided into four regions: A, B, C and D. Region A is the low wind speed region of heat exchanger 1 (2a) away from the condenser fan (1), region B is the high wind speed region of heat exchanger 1 (2a) close to the condenser fan (1), region C is the low wind speed region of heat exchanger 2 (2b) away from the condenser fan (1), and region D is the high wind speed region of heat exchanger 2 (2b) close to the condenser fan (1). Regions B and D are the heat exchange section, and regions A and C are the subcooling section.

3. The compact V-type condenser with a subcooling section as described in claim 1, characterized in that: The return liquid collection pipe (6) has a "Y" shaped structure, including two symmetrical inlet pipes and an outlet pipe that connects to the indoor unit. The inlet pipes are symmetrically arranged on the outside of the subcooling section and are all connected to the outlet pipe.

4. The compact V-type condenser with a subcooling section as described in claim 1, characterized in that: The exhaust manifold (3) and liquid manifold (4) located on the same side of the heat exchange section are connected by 9 heat exchange processes, each of which consists of 12 U-shaped heat exchange tubes connected in series. The subcooling manifold (5) and return liquid manifold (6) located on the same side of the subcooling section are connected by 3 subcooling processes, each of which consists of 4 U-shaped heat exchange tubes connected in series.

5. The compact V-type condenser with a subcooling section as described in claim 1, characterized in that: The exhaust manifold (3) and liquid collection manifold (4) located on the same side of the heat exchange section are connected by 14 heat exchange processes, each of which consists of 20 U-shaped heat exchange tubes connected in series. The subcooling manifold (5) and return liquid manifold (6) located on the same side of the subcooling section are connected by 4 subcooling processes, each of which consists of 6 U-shaped heat exchange tubes connected in series.

6. The compact V-type condenser with a subcooling section as described in claim 1, characterized in that: The condenser fan (1) adopts a stepless speed control device or EC electronic commutation DC frequency converter control. The condensation resistance in the heat exchange section is less than 40 kPa, the subcooling degree is 5℃, and the single loop length of the condenser ranges from 15 meters to 30 meters.

7. The compact V-type condenser with a subcooling section as described in claim 1, characterized in that: The V-type heat exchanger (2) uses 3 rows of internally threaded heat exchange tubes with an inner diameter of 7mm, a hole spacing of 19.05mm, a row spacing of 16mm, a tooth root thickness of 0.24mm, and a tooth height of 0.14mm.

8. The compact V-type condenser with a subcooling section as described in claim 1, characterized in that: The V-type heat exchanger (2) uses aluminum fins with a fin wall thickness of 0.105 mm, a fin spacing of 1.5 mm, and a corrugated fin shape.

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