R134a evaporative condenser with precooling function

Abstract

According to the R134a evaporative condenser with the precooling function, the surface air cooler, the condensing coil and the air cooling finned tube condenser are sequentially arranged on the air flow path, and the cooling water circulation system is arranged, so that the condenser can be switched to operate among the first mode, the second mode and the third mode according to environmental conditions; the problem that the condensation efficiency of an evaporative condenser is limited by the environment wet bulb temperature is solved, inlet air can be pre-cooled in a third mode in high-temperature weather, the enthalpy value of air entering a condensation section is actively reduced, more favorable evaporative cooling conditions are created for a condensation coil, and therefore the cooling effect is prevented from being greatly reduced, and the equipment temperature is prevented from being increased. Air cooling can be started at dry low temperature, evaporative cooling can be started in transition seasons, precooling and evaporative cooling can be jointly started at high temperature and high humidity, the condenser can be matched with an operation strategy with the highest energy efficiency under different working conditions through the self-adaptive adjusting capacity, the problem of insufficient energy efficiency utilization is solved, and the operation efficiency and the energy-saving effect are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of condensers, in particular to an R134a evaporative condenser with precooling. BACKGROUND

[0002] As a component of information technology infrastructure, data centers have become the core of supporting modern social services. Data centers include a large number of servers and equipment, which generate a large amount of heat during operation, and need to be maintained at a normal operating temperature through an efficient cooling system. Traditional cooling methods mainly include air conditioning refrigeration, liquid cooling and air cooling, etc. However, with the continuous expansion of data centers, traditional cooling methods have problems such as low energy efficiency, high energy consumption, high maintenance cost, etc., and there is an urgent need for a more efficient, energy-saving and cost-effective cooling solution. Evaporative condensers, as heat exchange equipment, can utilize water evaporation to remove a large amount of heat during heat exchange, thereby having high heat exchange efficiency, and have been widely used in data center cooling systems.

[0003] Traditional evaporative condensers have some limitations. First, the condensation efficiency of the evaporative condenser is often affected by the environmental wet-bulb temperature and relative humidity, especially in high-temperature weather conditions, its cooling effect will decrease significantly, causing the temperature of the equipment to rise, affecting the stable operation of the data center. Second, the design of the traditional condenser often lacks adaptability to environmental changes, and cannot achieve automatic adjustment, resulting in insufficient energy efficiency under different working conditions, thereby affecting the operating efficiency and energy-saving effect of the overall system. R134a is widely used in cooling systems due to its good thermodynamic performance and low global warming potential. Compared with traditional freon refrigerants, R134a has higher heat conduction efficiency and lower environmental impact, and therefore becomes an ideal choice for data center cooling systems.

[0004] However, the existing R134a-based evaporative condenser design, although it can achieve high cooling effect under certain conditions, still faces problems such as condensation efficiency being limited by environmental temperature, and insufficient energy efficiency utilization in actual application. SUMMARY

[0005] The application provides an R134a evaporative condenser with precooling to solve the problems of condensation efficiency being limited by environmental temperature and insufficient energy efficiency utilization.

[0006] The application provides an R134a evaporative condenser with precooling, comprising: a housing, both sides of which are provided with air inlets; a fan arranged on the housing for driving air to flow into the housing from the air inlets; An air-cooled finned tube condenser for first stage condensation of refrigerant using air; A condensing coil for second stage condensation of refrigerant using water evaporation; A water distribution device for spraying cooling water to the condensing coil; A cooling pad for pre-cooling the cooling water, and for pre-cooling air flowing into a housing; A cooling water circulation system for collecting the sprayed cooling water and delivering the cooling water to the cooling pad and / or the water distribution device; Wherein, the air flowing into the housing flows through the cooling pad, the condensing coil, and the air-cooled finned tube condenser in sequence; By controlling the water delivery path of the cooling water circulation system, the evaporative condenser operates in the following modes: In a first mode, the cooling water circulation system does not deliver water to the water distribution device; In a second mode, the cooling water circulation system delivers water to the water distribution device, and the cooling water delivered to the water distribution device does not flow through the cooling pad; In a third mode, the cooling water circulation system delivers water to the water distribution device, and the cooling water delivered to the water distribution device flows through the cooling pad.

[0007] In some possible embodiments, the air-cooled finned tube condenser and the condensing coil are connected in series through a refrigerant pipeline, which delivers refrigerant preliminarily condensed by the air-cooled finned tube condenser to the condensing coil for further condensation; A water baffle is arranged between the air-cooled finned tube condenser and the condensing coil, and is used to protect the air-cooled finned tube condenser.

[0008] In some possible embodiments, the cooling water circulation system comprises a water tank, a water pump, a main water supply pipeline, and a bypass pipeline; The water tank is used to store circulating water and collect cooling water flowing back from the condensing coil; The inlet of the water pump is connected to the water tank, and is used to deliver the circulating water; The main water supply pipeline passes through the cooling pad, and the bypass pipeline does not pass through the cooling pad; The cooling pad comprises a first cooling pad and a second cooling pad, the first cooling pad is connected to the water tank through the water pump, and the second cooling pad is connected to the water tank through the circulating water pipe in the main water supply pipeline. Circulating water passing through the first cooling pad and the second cooling pad is combined into a storage water pipe through the circulating water pipe in the main water supply pipeline, and the storage water pipe is connected to the water distribution device.

[0009] In some possible embodiments, the cooling water circulation system executes the second mode and the third mode by controlling the on-off state of the main water supply pipeline and the bypass pipeline; In the second mode, the bypass pipeline is turned on, and the section of the main water supply pipeline before the surface air cooler is turned off; In the third mode, the main water supply pipeline is turned on, and the bypass pipeline is turned off.

[0010] In some possible embodiments, the air inlet comprises a first air inlet and a second air inlet; and the condenser further comprises a PVC filler; In the case where the evaporative condenser executes the first mode, air enters the condenser through the first air inlet and the second air inlet, sequentially passes through the PVC filler, the condensing coil, and the air-cooled finned tube condenser, and exchanges heat with the refrigerant in the condensing coil and the air-cooled finned tube condenser to absorb the heat of the refrigerant, and the air that absorbs the heat of the refrigerant is discharged from the fan; In the case where the evaporative condenser executes the first mode, the refrigerant executes a first conversion process, which comprises: gaseous refrigerant enters the condenser from a first refrigerant inlet, is discharged from a first refrigerant outlet after first-stage condensation in the air-cooled finned tube condenser, is transported to a second refrigerant inlet through a refrigerant pipeline, and is subjected to second-stage condensation in the condensing coil, so that the refrigerant is converted from gaseous state to liquid state, and the liquid refrigerant is discharged from a second refrigerant outlet; In the case where the evaporative condenser executes the first mode, air enters the condenser through the first air inlet and the second air inlet, sequentially passes through the PVC filler, the condensing coil, and the air-cooled finned tube condenser, and exchanges heat with the refrigerant in the condensing coil and the air-cooled finned tube condenser to absorb the heat of the refrigerant, and the air that absorbs the heat of the refrigerant is discharged from the fan;

[0011] In some possible embodiments, the air inlet comprises a first air inlet and a second air inlet; and the condenser further comprises a PVC filler; In the case where the evaporative condenser executes the second mode, air enters the condenser through the first air inlet and the second air inlet, sequentially passes through the PVC filler, the condensing coil, and the air-cooled finned tube condenser; In the PVC filler, a first process is executed, which is evaporative cooling of air and a water film formed by the sprayed water in the PVC filler to take away the heat of the air and reduce the temperature of the circulating water; When passing through the condensing coil, a second process is executed, which is heat exchange between the air treated by the PVC filler and a water film formed by the water sprayed by the water distribution device to the outer wall of the condensing coil 3 to absorb the heat of the refrigerant in the condensing coil. When passing through the air-cooled finned tube condenser, a third process is performed, in which air passing through the condensing coil exchanges heat with the refrigerant in the air-cooled finned tube condenser to absorb heat of the refrigerant in the air-cooled finned tube condenser, and the air absorbing the heat of the refrigerant is discharged from the fan.

[0012] In some possible embodiments, the cooling water circulation system comprises a water tank, a water pump, a main water supply pipeline, and a bypass pipeline. When the evaporative condenser performs the second mode, the circulating water in the water tank passes through the water pump, sprays to the condensing coil through the bypass water pipe and the water distribution device, forms a water film on the outer wall of the condensing coil, exchanges heat and humidity with the air entering the first air inlet to absorb heat of the refrigerant in the condensing coil, and the circulating water absorbing the heat flows into the PVC filler, and the first process is performed in the PVC filler. When the evaporative condenser performs the second mode, the refrigerant performs a second conversion process, which is different from the first conversion process in that the refrigerant exchanges heat and humidity with the water film on the outer wall of the condensing coil in the condensing coil.

[0013] In some possible embodiments, the air inlet comprises a first air inlet and a second air inlet; and the condenser further comprises a PVC filler. When the evaporative condenser performs the third mode, air passes through the first air inlet and the second air inlet, enters the condenser, and sequentially passes through the PVC filler, the condensing coil, and the air-cooled finned tube condenser; the first process is performed in the PVC filler; the second process is performed when passing through the condensing coil; and the third process is performed when passing through the air-cooled finned tube condenser. When the evaporative condenser performs the second mode, the circulating water in the water tank passes through the water pump, enters the surface air cooler through the water inlet of the surface air cooler, and after the circulating water pre-cools air in the surface air cooler, sequentially passes through the water outlet of the surface air cooler and the water distribution device, sprays to the condensing coil, forms a water film on the outer wall of the condensing coil, exchanges heat and humidity with the air entering the first air inlet to absorb heat of the refrigerant in the condensing coil, and the circulating water absorbing the heat flows into the PVC filler, and the first process is performed in the PVC filler.

[0014] In some possible embodiments, the cooling water circulation system comprises a water tank, a water pump, a main water supply pipeline, and a bypass pipeline. When the evaporative condenser performs the third mode, the refrigerant performs a third conversion process, which is different from the first conversion process in that the refrigerant is condensed in the first stage in the surface air cooler.

[0015] In some possible embodiments, a filter is further included and arranged at the air inlet.

[0016] According to the above technical solution, the application provides an R134a evaporative condenser with pre-cooling, comprising: a shell, two sides of which are provided with air inlets; a fan arranged on the shell and used to drive air to flow into the shell from the air inlets; an air-cooled finned tube condenser used to condense refrigerant in the first stage by using air; a condensing coil used to condense refrigerant in the second stage by using water evaporation; a water distribution device used to spray cooling water to the condensing coil; a surface cooler used to pre-cool the cooling water and the air flowing into the shell; and a cooling water circulation system used to collect the sprayed cooling water and deliver the cooling water to the surface cooler and / or the water distribution device; wherein the air flowing into the shell flows through the surface cooler, the condensing coil and the air-cooled finned tube condenser in sequence; and by controlling the water delivery path of the cooling water circulation system, the condenser is operated in the following modes: in the first mode, the cooling water circulation system does not deliver water to the water distribution device; in the second mode, the cooling water circulation system delivers water to the water distribution device, and the cooling water delivered to the water distribution device does not flow through the surface cooler; and in the third mode, the cooling water circulation system delivers water to the water distribution device, and the cooling water delivered to the water distribution device flows through the surface cooler.

[0017] The condenser adopts the double condensing mode of the air-cooled finned tube condenser and the condensing coil, thereby improving the condensing effect. On the basis of the preliminary condensing of the air-cooled finned tube condenser, the condensing agent is delivered to the condensing coil through the refrigerant pipeline for further condensing, so as to maximize the improvement of the condensing efficiency. The condensing efficiency of the traditional condenser may be significantly reduced under high-temperature weather conditions, while the application is designed by deep condensing, so that the condensing process can better adapt to the change of environmental temperature, reduces the adverse effects of condensing efficiency caused by the fluctuation of external conditions, and ensures the stability and efficiency of the equipment.

[0018] Through the optimized water circulation system, the circulation of the cooling water is more efficient, and the energy waste that may exist in the traditional system is avoided. The pre-cooling air inlet design can work under the condition that the environmental wet-bulb temperature is high, thereby reducing the required cooling power and further improving the overall energy-saving performance of the refrigeration system. In addition, the use of the EC fan improves the air flow control accuracy, so that the air flow and the condensing effect are more matched, thereby avoiding excessive energy consumption and achieving the ideal effect of energy saving. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0020] Figure 1 The structure schematic diagram of the R134a evaporative condenser with pre-cooling provided by the embodiments of the present application.

[0021] Among them, 1-first air inlet; 2-second air inlet; 3-first filter; 4-second filter; 5-first surface cooler water outlet; 6-second surface cooler water outlet; 7-circulating water pipe A; 8-circulating water pipe C; 9-first surface cooler water inlet; 10-second surface cooler water inlet; 11-first water baffle; 12-second water baffle; 13-first surface cooler; 14-second surface cooler; 15-water pump; 16-circulating water pipe E; 17-water tank; 18-circulating water pipe B; 19-circulating water pipe D; 20-water distribution device; 21-refrigerant inlet of condensing coil; 22-refrigerant outlet of condensing coil; 23-condensing coil; 24-PVC filler; 25-third water baffle; 26-refrigerant pipeline; 27-refrigerant inlet of air-cooled finned tube condenser; 28-air-cooled finned tube condenser; 29-refrigerant outlet of air-cooled finned tube condenser; 30-fins of air-cooled finned tube condenser; 31-fan. DETAILED DESCRIPTION

[0022] The embodiments will be described in detail below, examples of which are shown in the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following embodiments do not represent all the embodiments consistent with the present application.

[0023] By Figure 1 It can be seen that the present application provides an R134a evaporative condenser with pre-cooling, which comprises: a shell, both sides of which are provided with air inlets, the shell is a rectangular shell, a fan 31 is arranged on the shell, the fan 31 is an EC fan, the air inlets are arranged symmetrically on both sides of the shell, wherein the air inlets include a first air inlet 1 and a second air inlet 2.

[0024] The shell is used to accommodate and support all other functional components, and provides sealed or guided passages for the flow of air and cooling water. The two air inlets are the entrances for external environment air to enter the interior of the condenser for heat exchange. In some implementations, the shell can be a rectangular box structure made of metal plate, and a continuous air duct is formed inside.

[0025] Fan 31 is used to drive air to flow into the shell from the air inlet. When the fan 31 is running, negative pressure or positive pressure is generated in the shell, thereby driving air to flow into the shell from the air inlets on both sides of the shell, and forcing the air to flow through various heat exchange components in the shell, and finally discharging the heat-exchanged air out of the shell. The fan 31 is used to provide stable and adjustable air flow, ensuring sufficient heat exchange with the refrigerant and cooling water.

[0026] Air-cooled finned tube condenser 28 is used to condense the refrigerant by air. The air-cooled finned tube condenser 28 is a device for exchanging heat between air and refrigerant, including a pipe inside for refrigerant flow, and fins outside for increasing heat exchange area. When air flows through the air-cooled finned tube condenser 28, the air contacts the fins 30 and the pipe surface of the air-cooled finned tube condenser 28, and absorbs the heat released by the high-temperature and high-pressure gaseous refrigerant in the pipe, thereby achieving preliminary cooling and condensation of the refrigerant. This condensation method mainly relies on the change of air sensible heat to take away heat.

[0027] In some embodiments, the air-cooled finned tube heat exchanger uses copper tube and aluminum fin, with a tube diameter D of 12.7 mm and a fin spacing of 2.4 mm, providing strong heat exchange capacity.

[0028] Condensing coil 23 is used to condense the refrigerant by water evaporation. The condensing coil 23 is another heat exchange component that uses the principle of water evaporation to cool the refrigerant. The condensing coil 23 is composed of multiple parallel or coiled pipes through which the refrigerant flows. The water distribution device 20 sprays cooling water onto the outer surface of the condensing coil 23, forming a layer of water film. When air passes through this layer of water film, part of the water evaporates, absorbing a large amount of latent heat of vaporization, thereby efficiently taking away the heat of the refrigerant in the condensing coil 23, achieving deep condensation of the refrigerant.

[0029] In some embodiments, the condensing coil 23 uses a light pipe D18x1.2mm, which is hot-dip galvanized to effectively improve corrosion resistance and service life.

[0030] Water distribution device 20 is used to receive cooling water delivered from the cooling water circulation system and spray or sprinkle it onto the surface of the condensing coil 23. Uniform spraying helps to form a continuous and complete water film on the outer wall of the condensing coil 23, avoiding dry spots, thereby ensuring the efficiency and uniformity of evaporation heat exchange. The water distribution device 20 can be a series of spray pipes with small holes arranged horizontally above the condensing coil 23.

[0031] The surface cooler is arranged on the inner side of the air inlet. When the cooling water flows through the pipes inside the surface cooler, the cooling water transfers its coldness to the air flowing outside the pipes, thereby reducing the temperature of the air. At the same time, the air is cooled when flowing through the surface cooler, and the dry-bulb temperature and the wet-bulb temperature of the air are both reduced. In the meantime, the cooling water is further cooled after flowing through the surface cooler.

[0032] In some embodiments, the surface cooler adopts a copper pipe and aluminum fin design, the copper pipe has a diameter D of 12.7 mm, and the fin spacing is 2.4 mm, which ensures excellent heat conduction and heat exchange performance.

[0033] The cooling water circulation system is used to collect the cooling water after spraying, and deliver the cooling water to the surface cooler and / or the water distribution device 20. The cooling water circulation system collects the cooling water flowing back from the condensing pipe 23 area and the lower part after heat exchange, and then selectively delivers the cooling water to the surface cooler and the water distribution device 20 by the driving of the power, so as to perform the next round of heat exchange. The cooling water circulation system constitutes a circulating path of water-side heat transfer in the condenser, and connects the two links of evaporative cooling and pre-cooling heat exchange through the water path.

[0034] The air is sucked into the shell from the air inlets on both sides of the shell under the driving of the fan 31. The air flowing into the shell first flows through the surface cooler, where the air is indirectly heat-exchanged with the cooling water flowing through the inside of the surface cooler, and the temperature of the air is preliminarily reduced. Then, the air pre-cooled continues to flow to the condensing pipe 23, and the air sweeps the water film formed by the water distribution device 20 on the outer wall of the condensing pipe 23, and the water film evaporates and absorbs a large amount of heat, thereby strongly cooling the refrigerant in the pipe. Finally, the air flows to the air-cooled finned tube condenser 28, and is heat-exchanged with the refrigerant in the air-cooled finned tube condenser 28 again, thereby further absorbing the residual heat of the refrigerant. At this time, the air completes the three-stage heat exchange journey as the cooling medium, and is finally discharged from the shell by the fan 31.

[0035] The condenser can adapt to different environmental conditions, because the water delivery path of the cooling water circulation system can be controlled. By controlling the start-stop and flow direction of the valve or the water pump 15, the flow logic of the cooling water between the surface cooler and the water distribution device 20 is changed, thereby forming three different operation modes, each mode corresponding to different environmental load and energy efficiency requirements.

[0036] In the first mode, the cooling water circulation system does not deliver cooling water to the water distribution device 20, at this time, the water distribution device 20 does not work, and there is no water film on the outer wall of the condensing pipe 23, and the evaporative cooling effect does not occur, and the condensation process completely depends on the sensible heat exchange when the air flows through the air-cooled finned tube condenser 28 and the dry condensing pipe 23. This mode is suitable for the case that the environmental temperature is low and dry, at this time, the cooling capacity of the air itself is sufficient, and the water system does not need to be started to save the energy consumption and water consumption of the water pump 15.

[0037] In the second mode, the cooling water circulation system supplies cooling water to the water distribution device 20, but this portion of cooling water does not flow through the surface cooler. This means that the collected cooling water is directly pumped to the water distribution device 20 and then sprayed onto the condensing coil 23. The water film evaporates on the outer wall of the condensing coil 23, utilizing the latent heat of vaporization of water to efficiently cool the refrigerant. Simultaneously, the air flowing through the area of ​​the condensing coil 23 also participates in the evaporative heat exchange process. However, in this mode, the air flowing through the surface cooler is not pre-cooled because no cooling water flows through it. This mode is suitable for transitional seasons with moderate ambient temperatures. Activating evaporative cooling can significantly improve condensation efficiency, but the benefits of pre-cooling are insufficient to offset the additional energy consumption of the water pump 15. Therefore, bypassing the surface cooler is a more energy-efficient option.

[0038] In the third mode, the cooling water circulation system supplies cooling water to the water distribution device 20. The cooling water supplied to the water distribution device 20 first flows through the surface cooler. At this time, the flow path of the cooling water is the longest, and its function is utilized in stages. The cooling water first flows through the surface cooler, where it cools the air and its own temperature rises. Then, this cooled water, which has been heated, continues to be supplied to the water distribution device 20 and sprayed onto the condenser coil 23. Although its temperature is higher than that of water directly drawn from the water tank 17, the air entering the condenser coil 23 area has been pre-cooled by the surface cooler, and its dry and wet bulb temperatures are lower. Therefore, the evaporative cooling efficiency at the condenser coil 23 is actually higher, which can more effectively condense the refrigerant. This mode is specifically designed for high-temperature and high-humidity summer environments. It uses pre-cooled air to cope with the problem of rising condensing pressure caused by high ambient temperature. Although the water pump 15 has the highest energy consumption, it achieves the highest overall condensing efficiency and system stability.

[0039] Depend on Figure 1 As shown, the unit as a whole, from top to bottom, consists of an EC fan 31, an air-cooled finned tube condenser 28, a third baffle plate 25, a water distribution device 20, a condenser coil 23, PVC packing 24, a first air inlet 1, a second air inlet 2, and a water tank 17. From left to right, the unit consists of a first air inlet 1, a first filter 3, a first surface cooler 13, and a first baffle plate 11. Since the two air inlets are symmetrically arranged, similarly, from right to left, the unit consists of a second air inlet 2, a second filter 4, a second surface cooler 14, and a second baffle plate 12.

[0040] In some embodiments, the air-cooled finned tube condenser 28 and the condensing coil 23 are connected by a refrigerant line 26. After the refrigerant is initially condensed in the air-cooled finned tube condenser 28, it enters the condensing coil 23 through the refrigerant line 26 for deep condensation. A baffle plate C is arranged between the air-cooled finned tube condenser 28 and the condensing coil 23 to prevent the air-cooled finned tube condenser 28 from being affected by water drift.

[0041] The water baffle C between the air-cooled finned tube condenser 28 and the condensing coil 23 can effectively prevent water droplets from entering the air-cooled finned tube condenser 28 during condensation. The heat exchange surface of the air-cooled finned tube condenser 28 is not affected by water droplets, ensuring the working efficiency of the air-cooled finned tube condenser 28 and the stable operation of the equipment.

[0042] In some embodiments, filters are arranged at the first air inlet 1 and the second air inlet 2 arranged symmetrically on both sides to filter the inlet air. The filters include a first filter 3 and a second filter 4 to ensure that the air entering the condenser is effectively filtered, thereby reducing dust, impurities and other pollutants in the air. This design not only effectively improves the heat exchange efficiency of the condenser, but also reduces the maintenance frequency and failure rate caused by the accumulation of pollutants inside the equipment. Through the fine design of the filter, the deposition of impurities in the air on the surface of the air cooler and the condenser can be prevented, avoiding the obstruction of the heat exchange process by these impurities, thereby improving the long-term stability and working efficiency of the entire cooling system.

[0043] In this embodiment, the refrigerant is the more environmentally friendly R134a refrigerant, which has a lower global warming potential and better thermodynamic performance. Compared with traditional freon-based refrigerants, R134a not only has environmental friendliness, but also can provide higher heat conduction effect and reduce cooling energy consumption. The overall system improves economic benefits by improving condensing efficiency, reducing energy consumption, and prolonging equipment life. Especially for large-scale data centers and other energy-intensive industries, it can reduce the operating cost of the data center and improve its economic benefits.

[0044] In some embodiments, the cooling water circulation system includes a water tank 17, a water pump 15, a main water supply pipeline and a bypass pipeline, The water tank 17 is used to store circulating water and collect cooling water flowing back from the condensing coil 23 area; The inlet of the water pump 15 is connected to the water tank 17 for conveying the circulating water; The main water supply pipeline passes through the air cooler, and the bypass pipeline does not pass through the air cooler.

[0045] The main water supply pipeline includes circulating water pipes A7, C8, B18 and D19, and the bypass pipeline is circulating water pipe E16.

[0046] The surface cooler comprises a first surface cooler 13 and a second surface cooler 14, the first surface cooler 13 is supplied with water pumped from a water tank 17 by a water pump 15, and the second surface cooler 14 is supplied with water provided by a circulating water pipe B 18 at the first surface cooler 13, and the circulating water after the first surface cooler 13 and the second surface cooler 14 is respectively converged to a circulating water pipe D 19 by a circulating water pipe A 7 and a circulating water pipe C 8, and then to a water distribution device 20.

[0047] The first surface cooler 13 and the second surface cooler 14 preliminarily reduce the air dry-bulb temperature and wet-bulb temperature, which helps to improve the subsequent condensation efficiency; in the air-cooled finned tube condenser 28, the R134a refrigerant circulates in the coil, and exchanges heat with the external air passing through the inlet; inside the condensing coil 23, the R134a refrigerant circulates in the coil, and exchanges heat with the water film formed by the external sprayed water; the sprayed water outside the condensing coil 23 forms a water film outside the coil, evaporates after absorbing the heat of the R134a refrigerant in the coil, and carries away the heat to achieve cooling; the PVC filler 24 increases the wetted surface area and prolongs the water and air contact time, promotes the evaporation of water and absorbs heat, thereby enhancing the cooling effect. The sprayed water after cooling is circulated through the first surface cooler 13, the second surface cooler 14, the condensing coil 23 and the PVC filler 24 to realize the step-by-step utilization of the cooling capacity of the low-temperature cooling water.

[0048] The cooling water circulation system executes the second mode and the third mode by controlling the on-off state of the main water supply pipeline and the bypass pipeline; in the second mode, the bypass pipeline is turned on, and the section of the main water supply pipeline before the surface cooler is turned off; in the third mode, the main water supply pipeline is turned on, and the bypass pipeline is turned off.

[0049] In some embodiments, when the condenser executes the first mode, the working process of the air system is as follows: air enters the condenser through the first air inlet 1 and the second air inlet 2, passes through the PVC filler 24, the condensing coil 23, and the air-cooled finned tube condenser 28 in sequence, and exchanges heat with the refrigerant in the condensing coil 23 and the air-cooled finned tube condenser 28 to absorb the heat of the refrigerant, and the air that has absorbed the heat of the refrigerant is discharged from the fan 31.

[0050] According to the working process of the fluorine system, the refrigerant performs a first conversion process, which includes: the medium of condensing R134a refrigerant depends entirely on the air entering through the first air inlet 1 and the second air inlet 2, the high-temperature and high-pressure gaseous refrigerant enters the condenser from the first refrigerant inlet, and after the first-stage condensation in the air-cooled finned tube condenser 28, it is discharged from the first refrigerant outlet and transported to the second refrigerant inlet through the refrigerant pipeline 26, and after the second-stage condensation in the condensing coil 23, the refrigerant is converted from a gaseous state to a liquid state, and the liquid refrigerant is discharged from the second refrigerant outlet.

[0051] The first refrigerant inlet is the refrigerant inlet 27 of the air-cooled finned tube condenser, the first refrigerant outlet is the refrigerant outlet 29 of the air-cooled finned tube condenser, the second refrigerant inlet is the refrigerant inlet 21 of the condensing coil, and the second refrigerant outlet is the refrigerant outlet 22 of the condensing coil.

[0052] In some embodiments, when the condenser performs the second mode, air enters the condenser through the first air inlet 1 and the second air inlet 2, and sequentially passes through the PVC filler 24, the condensing coil 23, and the air-cooled finned tube condenser 28. In the PVC filler 24, a first process is performed, which is evaporative cooling of the air with the water film formed by the sprayed water in the PVC filler 24 to remove the heat of the air and reduce the temperature of the circulating water.

[0053] When passing through the condensing coil 23, a second process is performed, which is heat exchange between the air treated by the PVC filler 24 and the water film formed by the water sprayed by the water distribution device 20 to the outer wall of the condensing coil 3 to absorb the heat of the refrigerant in the condensing coil 23.

[0054] When passing through the air-cooled finned tube condenser 28, a third process is performed, which is heat exchange between the air passing through the condensing coil 23 and the refrigerant in the air-cooled finned tube condenser 28 to absorb the heat of the refrigerant in the air-cooled finned tube condenser 28, and the air absorbing the heat of the refrigerant is discharged from the fan 31.

[0055] Specifically, under the action of the fan 31 above the unit, air enters the R134a evaporative condenser through the first air inlet 1 and the second air inlet 2, and the air entering the first air inlet 1 and the second air inlet 2 successively passes through the PVC filler 24, the condensing coil 23, and the air-cooled finned tube condenser 28. In the PVC filler 24, the air is directly evaporatively cooled with the water film formed by the spray water falling into the PVC filler 24, and the water evaporates to absorb heat, thereby reducing the circulating water temperature while taking away the heat of the air. When passing through the condensing coil 23, the air treated by the PVC filler 24 exchanges heat with the uniform water film formed by the water sprayed by the water distribution device 20 to the outer wall of the condensing coil 23, thereby taking away the heat of the R134a refrigerant in the condensing coil 23. The working air then passes through the air-cooled finned tube condenser 28, exchanges heat with the R134a refrigerant in the air-cooled finned tube condenser 28, and the air after absorbing the heat of the R134a refrigerant is discharged from the EC fan 31.

[0056] According to the water system working process, the circulating water in the water tank 17 is sprayed by the water pump 15 through the bypass water pipe and the water distribution device 20 to the condensing coil 23 to form a water film on the outer wall of the condensing coil 23. The water film exchanges heat and moisture with the air entering the first air inlet 1 to absorb the heat of the refrigerant in the condensing coil 23. The circulating water after absorbing heat flows into the PVC filler 24 to perform the first process in the PVC filler 24.

[0057] Specifically, the circulating water in the water tank 17 is sprayed by the water pump 15 through the bypass water pipe 16 directly by the water distribution device 20 to the condensing coil 23 to form a uniform and continuous water film on the outer wall of the condensing coil 23. The water film exchanges heat and moisture with the air entering the first air inlet 1, and the water film continuously evaporates to take away the heat of the R134a refrigerant in the condensing coil 23. The working circulating water falls into the PVC filler 24 under the action of gravity. Similarly, the circulating water forms a uniform water film in the PVC filler 24 to directly evaporatively cool the air entering the first air inlet 1 and the second air inlet 2, thereby reducing the temperature of the air and the circulating water. The circulating water after being cooled by heat and moisture exchange in the PVC filler 24 falls back into the water tank 17 by gravity.

[0058] According to the water system working process, the circulating water in the water tank 17 is sprayed by the water pump 15 through the bypass water pipe and the water distribution device 20 to the condensing coil 23 to form a water film on the outer wall of the condensing coil 23. The water film exchanges heat and moisture with the air entering the first air inlet 1 to absorb the heat of the refrigerant in the condensing coil 23. The circulating water after absorbing heat flows into the PVC filler 24 to perform the first process in the PVC filler 24.

[0059] Specifically, in the dry and wet mode, the medium condensing R134a refrigerant depends on the air entering through the first air inlet 1 and the second air inlet 2, and relies on the circulating water to form a continuous and uniform water film to evaporate and absorb heat. The high-temperature and high-pressure gaseous R134a refrigerant enters the unit from the refrigerant inlet 27 of the air-cooled finned tube condenser, is preliminarily condensed by the air entering through the first air inlet 1 and the second air inlet 2 in the air-cooled finned tube condenser 28, is discharged from the refrigerant outlet 29 of the air-cooled finned tube condenser, is sent to the refrigerant inlet 21 of the condensing coil through the refrigerant pipeline 26, and is subjected to heat and humidity exchange with the water film on the outer wall of the condensing coil 23 and is deeply condensed. The high-temperature and high-pressure liquid R134a refrigerant is sent out of the unit from the refrigerant inlet 22 of the condensing coil.

[0060] In the high-temperature mode, the pre-cooling mode is executed, and in the pre-cooling mode, the EC fan 31, the water pump 15, the first surface cooler 13, and the second surface cooler 14 are all turned on. At this time, the circulating water in the water tank 17 is pre-cooled by the first surface cooler 13 and the second surface cooler 14 after being cooled by the air entering through the first air inlet 1 and the second air inlet 2, and is then sent to the water distribution device 20 through the circulating water pipe D19 and then sprayed to the condensing coil 23. The pre-cooling mode not only pre-cools the air entering through the first air inlet 1 and the second air inlet 2, but also utilizes the cold energy of the low-temperature circulating water in stages.

[0061] In some embodiments, when the condenser executes the third mode, air passes through the first air inlet 1 and the second air inlet 2, enters the condenser, and sequentially passes through the PVC filler 24, the condensing coil 23, and the air-cooled finned tube condenser 28. In the PVC filler 24, the first process is executed. When passing through the condensing coil 23, the second process is executed. When passing through the air-cooled finned tube condenser 28, the third process is executed.

[0062] According to the working process of the air system, under the action of the EC fan 31 above the unit, air enters the R134a evaporative condenser after being preliminarily cooled by the first air inlet 1, the second air inlet 2, the first surface cooler 13, and the second surface cooler 14. The pre-cooled air sequentially passes through the PVC filler 24, the condensing coil 23, and the air-cooled finned tube condenser 28. In the PVC filler 24, the water film formed by the sprayed water falling into the PVC filler 24 is directly evaporatively cooled, and the water evaporates and absorbs heat, thereby reducing the temperature of the circulating water while removing the heat of the air. When passing through the condensing coil 23, the air entering through the PVC filler 24 exchanges heat with the uniform water film formed by the water sprayed by the water distribution device 20 to the outer wall of the condensing coil 23, thereby removing the heat of the R134a refrigerant in the condensing coil 23. The worked air then passes through the air-cooled finned tube condenser 28, exchanges heat with the R134a refrigerant in the air-cooled finned tube condenser 28, and is discharged from the EC fan 31 after absorbing the heat of the R134a refrigerant.

[0063] In the case that the condenser executes the second mode, the circulating water in the water tank 17, through the water pump 15, enters the surface cooler through the water inlet of the surface cooler, and after the circulating water pre-cools the air in the surface cooler, it successively passes through the water outlet of the surface cooler, the water distribution device 20, the water distribution device 20 sprays to the condensing coil 23, forms a water film on the outer wall of the condensing coil 23, and the water film exchanges heat and humidity with the air inlet of the first air inlet 1 to absorb the heat of the refrigerant in the condensing coil 23. After absorbing the heat, the circulating water flows into the PVC filler 24, and the first process is executed in the PVC filler 24.

[0064] Specifically, the circulating water in the water tank 17 first enters the first surface cooler 13 through the first surface cooler water inlet 9 under the action of the water pump 15, and is sent to the second surface cooler water inlet 10 through the circulating water pipe B 18 to enter the second surface cooler 14; the circulating water after pre-cooling the air in the first surface cooler 13 is discharged from the first surface cooler 13 through the first surface cooler water outlet 5, and after the water outlet of the second surface cooler 14 is combined through the circulating water pipe A 7, it is sent to the water distribution device 20 through the circulating water pipe D 19; the circulating water after pre-cooling the air in the second surface cooler 14 is discharged from the second surface cooler 14 through the second surface cooler water outlet 6, and after the water outlet of the first surface cooler 13 is combined through the circulating water pipe C 8, it is sent to the water distribution device 20 through the circulating water pipe D 19; and then sprayed to the condensing coil 23, forming a uniform and continuous water film on the outer wall of the condensing coil 23, and exchanging heat and humidity with the air after the first air inlet 1 and the second air inlet 2 are preliminarily cooled. The water film continuously evaporates to take away the heat of the R134a refrigerant in the condensing coil 23, and the working circulating water falls into the PVC filler 24 under the action of gravity, and similarly, the circulating water forms a uniform water film in the PVC filler 24 and directly evaporative cooling with the air after the first air inlet 1 and the second air inlet 2 are preliminarily cooled, reducing the temperature of the air while reducing the temperature of the circulating water. The circulating water after being cooled by the heat and humidity exchange of the PVC filler 24 and the air falls back to the water tank 17 by gravity.

[0065] In the case that the condenser executes the third mode, the refrigerant executes a third conversion process, and the difference between the third conversion process and the first conversion process is that the first stage condensation is performed in the surface cooler.

[0066] Specifically, according to the working process of the fluorine system, in the pre-cooling mode, the working principle of the fluorine system is similar to that of the dry-wet mode: the medium for condensing R134a refrigerant depends on the air entering through the first air inlet 1 and the second air inlet 2, and the air is preliminarily cooled by the first surface cooler 13 and the second surface cooler 14, and also depends on the circulating water to form a continuous and uniform water film to evaporate and absorb heat. The gaseous R134a refrigerant at high temperature and high pressure enters the unit from the refrigerant inlet 27 of the air-cooled finned tube condenser, is preliminarily condensed in the air-cooled finned tube condenser 28 by relying on the air entering through the first air inlet 1 and the second air inlet 2 and being preliminarily cooled by the first surface cooler 13 and the second surface cooler 14, and is discharged from the refrigerant outlet 29 of the air-cooled finned tube condenser, and then is sent to the refrigerant inlet 21 of the condensing coil through the refrigerant pipeline 26. After heat and humidity exchange with the water film on the outer wall of the condensing coil 23 and deep condensation, the liquid R134a refrigerant at high temperature and high pressure is sent out of the unit from the refrigerant inlet 22 of the condensing coil.

[0067] The similar parts among the embodiments provided in the present application can be referred to each other, and the specific embodiments provided above are only a few examples under the general concept of the present application, and do not constitute a limitation on the protection scope of the present application. For those skilled in the art, any other embodiments extended according to the present application scheme without creative labor shall fall within the protection scope of the present application.

Claims

1. An R134a evaporative condenser with pre-cooling, characterized in that, include: The casing has air inlets on both sides; A fan, mounted on the housing, is used to drive air from the air inlet into the housing; Air-cooled finned tube condensers are used to perform the first stage of condensation of the refrigerant using air. Condensing coils are used to perform secondary condensation of the refrigerant by utilizing water evaporation. A water distribution device is used to spray cooling water onto the condenser coil; A surface cooler is used to precool the cooling water and to precool the air flowing into the housing; A cooling water circulation system is used to collect the cooling water after spraying and to transport the cooling water to the surface cooler and / or the water distribution device; The air flowing into the housing passes sequentially through the surface cooler, the condenser coil, and the air-cooled finned tube condenser. By controlling the water supply path of the cooling water circulation system, the evaporative condenser can be operated in the following mode: In the first mode, the cooling water circulation system does not supply water to the water distribution device; In the second mode, the cooling water circulation system supplies water to the water distribution device, and the cooling water supplied to the water distribution device does not flow through the surface cooler; In the third mode, the cooling water circulation system supplies water to the water distribution device, and the cooling water supplied to the water distribution device flows through the surface cooler.

2. The R134a evaporative condenser with pre-cooling according to claim 1, characterized in that, The air-cooled finned tube condenser and the condensing coil are connected in series via a refrigerant pipeline. The refrigerant pipeline delivers the refrigerant, which has been initially condensed by the air-cooled finned tube condenser, to the condensing coil for further condensation. A baffle plate is provided between the air-cooled finned tube condenser and the condensing coil, and the baffle plate is used to protect the air-cooled finned tube condenser.

3. The R134a evaporative condenser with pre-cooling according to claim 1, characterized in that, The cooling water circulation system includes a water tank, a water pump, a main water supply pipeline, and a bypass pipeline; The water tank is used to store circulating water and collect cooling water flowing back from the condenser coil; The inlet of the water pump is connected to the water tank and is used to transport the circulating water; The main water supply pipeline passes through the surface cooler, while the bypass pipeline does not pass through the surface cooler. The surface cooler includes a first surface cooler and a second surface cooler. The first surface cooler is connected to the water tank via the water pump. The second surface cooler is connected to the water tank via a circulating water pipe in the main water supply pipeline. The circulating water passing through the first surface cooler and the second surface cooler converges into a storage water pipe via the circulating water pipe in the main water supply pipeline. The storage water pipe is connected to the water distribution device.

4. The R134a evaporative condenser with pre-cooling according to claim 3, characterized in that, The cooling water circulation system executes the second mode and the third mode by controlling the on / off state of the main water supply pipeline and the bypass pipeline; In the second mode, the bypass pipeline is open, and the section of the main water supply pipeline before the surface cooler is closed; In the third mode, the main water supply pipeline is open, and the bypass pipeline is closed.

5. The R134a evaporative condenser with pre-cooling according to claim 1, characterized in that, The air inlet includes a first air inlet and a second air inlet; the condenser also includes PVC filler. When the evaporative condenser is operating in the first mode, air enters the condenser through the first air inlet and the second air inlet, passes through the PVC packing, condenser coil, and air-cooled finned tube condenser in sequence, and exchanges heat with the refrigerant in the condenser coil and air-cooled finned tube condenser to absorb the heat of the refrigerant. The air that has absorbed the heat of the refrigerant is discharged from the fan. When the evaporative condenser is operating in the first mode, the refrigerant performs a first conversion process, which includes: gaseous refrigerant entering the condenser from the first refrigerant inlet, undergoing first-stage condensation in the air-cooled finned tube condenser, being discharged from the first refrigerant outlet, being transported to the second refrigerant inlet via a refrigerant pipeline, undergoing second-stage condensation in the condensing coil, and the refrigerant being converted from a gaseous state to a liquid state, with the liquid refrigerant being discharged from the second refrigerant outlet; Wherein, the first refrigerant inlet is the refrigerant inlet of the air-cooled finned tube condenser, the first refrigerant outlet is the refrigerant outlet of the air-cooled finned tube condenser, the second refrigerant inlet is the refrigerant inlet of the condensing coil, and the second refrigerant outlet is the refrigerant outlet of the condensing coil.

6. The R134a evaporative condenser with pre-cooling according to claim 1, characterized in that, The air inlet includes a first air inlet and a second air inlet; the evaporative condenser also includes PVC packing. When the evaporative condenser is operating in the second mode, air enters the condenser through the first air inlet and the second air inlet, and passes sequentially through the PVC packing, the condenser coil, and the air-cooled finned tube condenser. In the PVC packing, a first process is performed, in which the air and the water film formed by the sprayed water falling into the PVC packing are evaporated and cooled to remove the heat from the air and reduce the temperature of the circulating water. When passing through the condenser coil, a second process is performed. The second process is that the air treated by the PVC filler exchanges heat with the water film formed by the water distribution device sprayed onto the outer wall of the condenser coil to absorb the heat of the refrigerant in the condenser coil. When passing through the air-cooled finned tube condenser, a third process is performed. The third process involves the air passing through the condensing coil exchanging heat with the refrigerant in the air-cooled finned tube condenser to absorb the heat from the refrigerant in the air-cooled finned tube condenser. The air that has absorbed the heat from the refrigerant is then discharged from the fan.

7. The R134a evaporative condenser with pre-cooling according to claim 6, characterized in that, The cooling water circulation system includes a water tank, a water pump, a main water supply pipeline, and a bypass pipeline; When the evaporative condenser is in the second mode, the circulating water in the water tank is sprayed onto the condensing coil through the water pump, bypass water pipe and water distribution device, forming a water film on the outer wall of the condensing coil. The water film exchanges heat and moisture with the incoming air at the first air inlet to absorb the heat of the refrigerant in the condensing coil. The circulating water after absorbing heat flows into the PVC packing and performs the first process in the PVC packing. When the evaporative condenser is operating in the second mode, the refrigerant performs a second conversion process. The difference between the second conversion process and the first conversion process is that the refrigerant exchanges heat and moisture with the water film on the outer wall of the condensing coil.

8. The R134a evaporative condenser with pre-cooling according to claim 1, characterized in that, The air inlet includes a first air inlet and a second air inlet; the condenser also includes PVC filler. When the evaporative condenser is in the third mode, air passes through the first air inlet and the second air inlet, passes through the surface cooler, enters the condenser, and sequentially passes through the PVC packing, condenser coil, and air-cooled finned tube condenser; the first process is performed in the PVC packing; the second process is performed when passing through the condenser coil; and the third process is performed when passing through the air-cooled finned tube condenser. When the evaporative condenser is operating in the second mode, the circulating water in the water tank is pumped and enters the surface cooler through the inlet. After the air is pre-cooled by the surface cooler, the circulating water passes through the outlet of the surface cooler and the water distribution device in sequence. The water distribution device sprays water onto the condenser coil, forming a water film on the outer wall of the condenser coil. The water film exchanges heat and moisture with the incoming air at the first air inlet to absorb heat from the refrigerant in the condenser coil. The circulating water that has absorbed heat flows into the PVC packing and performs the first process within the PVC packing.

9. The R134a evaporative condenser with pre-cooling according to claim 8, characterized in that, The cooling water circulation system includes a water tank, a water pump, a main water supply pipeline, and a bypass pipeline; When the evaporative condenser is in the third mode, the refrigerant performs a third conversion process, which differs from the first conversion process in that the first stage of condensation is performed in the surface cooler.

10. The R134a evaporative condenser with pre-cooling according to claim 1, characterized in that, It also includes a filter, which is disposed at the air inlet.

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