An evaporative condenser

Abstract

This utility model relates to an evaporative condenser; it includes an evaporative condenser body, a gas phase outlet at the top of the evaporative condenser body, an axial flow fan at the gas phase outlet, a circulating water pipe on one side of the bottom of the evaporative condenser body, the bottom of the circulating water pipe being connected to the bottom of the evaporative condenser body, a circulating water pump on the circulating water pipe, and the end of the circulating water pipe being connected to a water distribution pipe located in the upper part of the evaporative condenser body, with a refrigerant coil at the lower part of the water distribution pipe. The inner bottom of the evaporative condenser body is equipped with a dry ice machine venting air heat exchange unit for heat exchange with the circulating water. By utilizing a combined condensation method of dry ice machine venting air, circulating water, and air, the high-temperature superheated gaseous refrigerant is condensed into a liquid refrigerant, and the liquid refrigerant is in a subcooled state, thereby achieving the characteristic of reducing the power consumption of the refrigeration compressor.

Description

Technical Field

[0001] This utility model belongs to the field of evaporative condenser technology, specifically relating to an evaporative condenser that uses the cooling capacity of the air released from a dry ice machine to cool the refrigerant. Background Technology

[0002] An evaporative condenser is a highly efficient heat exchange device. Its main function is to convert high-temperature gaseous refrigerant into liquid refrigerant through heat exchange with sprayed water and air. This process utilizes the latent heat of vaporization of water and the cooling effect of air. The combined use of sprayed water and air achieves effective cooling and condensation of the refrigerant. The evaporative condenser removes heat through heat exchange between air and sprayed water, and its efficiency depends on the "wet-bulb temperature" of the air (a key indicator of air cooling capacity). In high-temperature and high-humidity environments, the wet-bulb temperature of the air increases, reducing the temperature difference with the sprayed water and significantly decreasing heat dissipation capacity. Simultaneously, high-humidity air has a weak capacity to hold water vapor, reducing the evaporation rate of the sprayed water and further weakening the heat exchange effect. This may lead to increased condensing pressure and insufficient system cooling capacity. In industrial production, to achieve the same cooling capacity, the refrigeration compressor needs to provide a higher compression ratio and higher power consumption. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides an evaporative condenser to solve the technical problems existing in the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] An evaporative condenser includes an evaporative condenser body, a gas phase outlet at the top of the evaporative condenser body, an axial flow fan at the gas phase outlet, a circulating water pipe on one side of the bottom of the evaporative condenser body, the bottom of the circulating water pipe being connected to the bottom of the evaporative condenser body, a circulating water pump on the circulating water pipe, and the end of the circulating water pipe being connected to a water distribution pipe located in the upper part of the evaporative condenser body, a refrigerant coil being located at the lower part of the water distribution pipe, and a dry ice machine venting air heat exchange unit being located at the inner bottom of the evaporative condenser body for exchanging heat with the circulating water.

[0006] The beneficial effects of this utility model are as follows: This utility model is applicable to seasons or regions with high temperature and high humidity (which can refer to an air temperature of not less than 30°C and a relative humidity of not less than 60%). By using a dry ice machine to release air, circulating water and air in a comprehensive condensation method, the high temperature superheated gaseous refrigerant is condensed into a liquid refrigerant, and the liquid refrigerant is in a supercooled state, thereby achieving the characteristic of reducing the power consumption of the refrigeration compressor.

[0007] Preferably, the dry ice machine venting heat exchange unit includes a dry ice machine exhaust pipe, which is connected to an venting pipe located outside the evaporative condenser body via a heat exchange coil located at the bottom of the evaporative condenser body.

[0008] Preferably, the dry ice machine exhaust heat exchange unit includes a dry ice machine exhaust pipe, which is connected to a heat exchange coil located at the bottom of the evaporative condenser body, and exhaust holes are evenly distributed at the bottom of the heat exchange coil.

[0009] Preferably, the height of the heat exchange coil is lower than the liquid level of the circulating water at the bottom of the evaporative condenser body, and a primary water replenishment pipe is provided above the circulating water level.

[0010] Preferably, a packing layer is provided at the middle position of the upper part of the primary water supply pipe, and an air inlet is provided on the inner wall of the evaporative condenser body corresponding to the packing layer.

[0011] Preferably, a water collector is provided between the axial flow fan and the water distribution pipe.

[0012] This utility model also includes a PLC control system. The signal input terminal of the PLC control system is connected to the temperature sensor, and the signal output terminal of the PLC control system is connected to the dry ice air release regulating valve. A temperature sensor for measuring the temperature of circulating water is provided at the bottom of the evaporative condenser body, and a dry ice air release regulating valve is provided between the dry ice machine's exhaust pipe and the heat exchange coil.

[0013] Preferably, the top of the evaporative condenser body is provided with a gas phase outlet and a carbon dioxide gas concentration detector. The carbon dioxide gas concentration detector is connected to the signal input terminal of the PLC control system, and the signal output terminal of the PLC control system is connected to an audible and visual alarm.

[0014] An evaporative condenser manufactured according to the above scheme condenses the high-temperature superheated gaseous refrigerant into a liquid refrigerant by utilizing a combined condensation method of dry ice machine venting air, circulating water, and air. The liquid refrigerant is in a subcooled state, thereby reducing the power consumption of the refrigeration compressor. Based on this, the present invention is particularly suitable for seasons or regions with high temperature and humidity. The present invention utilizes the cooling capacity of the air venting from the dry ice machine through heat exchange coils and circulating water, achieving utilization of the cooling capacity of the air venting from the dry ice machine while avoiding condensation of water in the air. Simultaneously, through the tubes of the heat exchange coils… Indirect wall heat exchange enables active cooling of circulating water, offsetting the effects of high temperature and high humidity environments and ensuring a consistently constant refrigerant condensation pressure (e.g., ≤1.4 MPaG for ammonia systems). This reduces the power consumption of the refrigeration compressor by 15-20%. Utilizing dry ice to release air as a stable cold source allows the circulating water at the bottom of the evaporative condenser to be cooled to below 12°C, lowering the condensation temperature by 8-10°C compared to traditional evaporative condensers (below the wet-bulb temperature). It features a simple structure, reasonable design, and effectively utilizes waste cooling energy to prevent condensation in the air while reducing the power consumption of the refrigeration compressor. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is another structural schematic diagram of the present invention.

[0018] Figure 3 This is a schematic diagram showing the positional relationship between the heat exchange coil and the exhaust port of this utility model.

[0019] Figure 4 This is a schematic diagram of the control principle of this utility model.

[0020] Figure 5 This is another control principle diagram of this utility model.

[0021] In the diagram: 1. Evaporative condenser body; 2. Axial flow fan; 3. Circulating water pipe; 4. Circulating water pump; 5. Water distribution pipe; 6. Refrigerant coil; 7. Dry ice machine exhaust pipe; 8. Heat exchange coil; 9. Vent pipe; 10. Exhaust vent; 11. Primary water replenishment pipe; 12. Packing layer; 13. Air inlet; 14. Water collector; 15. PLC control system; 16. Temperature sensor; 17. Dry ice vent regulating valve; 18. Carbon dioxide gas concentration detector; 19. Audible and visual alarm. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] The following is in conjunction with the appendix Figure 1 , 2 This application provides a further detailed description of an evaporative condenser, comprising an evaporative condenser body 1, a gas phase outlet at the top of the evaporative condenser body 1, an axial flow fan 2 at the gas phase outlet, a circulating water pipe 3 on one side of the bottom of the evaporative condenser body 1, the bottom of the circulating water pipe 3 being connected to the bottom of the evaporative condenser body 1, a circulating water pump 4 on the circulating water pipe 3, and the end of the circulating water pipe 3 being connected to a water distribution pipe 5 located in the upper part of the evaporative condenser body 1, a refrigerant coil 6 located at the lower part of the water distribution pipe 5, and a dry ice machine air release heat exchange unit located at the inner bottom of the evaporative condenser body 1 for exchanging heat with the circulating water. This invention provides a technical solution that uses the air released from a dry ice machine to exchange heat with circulating water, thereby reducing the temperature of the circulating water and condensing the high-temperature superheated gaseous refrigerant into a liquid refrigerant. This technical solution is particularly suitable for seasons or regions with high temperature and humidity. The above technical solution can not only reduce the energy consumption of the refrigeration compressor in the subsequent process, but also utilize the cold energy of the air released from the dry ice machine, while avoiding the defect of condensation in the air when releasing the air.

[0024] Furthermore, attached Figure 1As shown, the dry ice machine venting heat exchange unit includes a dry ice machine exhaust pipe 7, which is connected to a venting pipe 9 located outside the evaporative condenser body 1 via a heat exchange coil 8 located at the bottom of the evaporative condenser body 1. The technical solution adopted by the dry ice machine venting heat exchange unit in this invention is as follows: the venting air in the dry ice machine exhaust pipe 7 enters the heat exchange coil 8, allowing heat exchange between the venting air and the circulating water; the venting air after heat exchange is then discharged through the venting pipe 9.

[0025] Furthermore, attached Figure 2 , 3 As shown, the dry ice machine venting heat exchange unit includes a dry ice machine exhaust pipe 7, which is connected to a heat exchange coil 8 located at the bottom of the evaporative condenser body 1. Exhaust holes 10 are evenly distributed at the bottom of the heat exchange coil 8. Another technical solution for the dry ice machine venting heat exchange unit described in this invention is as follows: the venting air in the dry ice machine exhaust pipe 7 enters the heat exchange coil 8, allowing heat exchange between the venting air and the circulating water; further, to fully utilize the cooling capacity of the venting air, the venting air enters the circulating water through the exhaust holes 10, allowing the circulating water to cool down sufficiently; even further, after being cooled by sufficient contact with the circulating water, the venting air rises further, allowing it to mix with normal air for cooling; the above method can fully utilize the cooling capacity of the venting air and saves on the installation of an venting pipe. Figure 2 As shown, the dry ice machine's exhaust pipe 7 is connected to the upper layer of the heat exchange coil 8, and the lower layer of the heat exchange coil 8 is provided with an exhaust port 10, which is located towards the bottom of the evaporative condenser body 1.

[0026] Furthermore, the height of the heat exchange coil 8 is lower than the liquid level of the circulating water at the bottom of the evaporative condenser body 1, and a primary water replenishment pipe 11 is provided above the circulating water level. In order to ensure the heat exchange effect, the heat exchange coil 8 in this utility model is set in the circulating water. Furthermore, when the amount of circulating water is small, circulating water can be replenished through the primary water replenishment pipe 11 to achieve long-term stable operation of this utility model.

[0027] Furthermore, a packing layer 12 is provided at the middle position of the upper part of the primary water supply pipe 11, and an air inlet 13 is provided on the inner wall of the evaporative condenser body 1 corresponding to the packing layer 12. The air inlet 13 is used for external air to enter the evaporative condenser body 1. When the second technical solution described above is adopted, the external air can be mixed with the exhaust air to achieve the characteristic of reducing the air temperature.

[0028] Furthermore, a water collector 14 is provided between the axial flow fan 2 and the water distribution pipe 5. By setting up the water collector 14, water can be recycled, thereby improving the utilization rate of circulating water.

[0029] like Figure 1 , 4 As shown, this utility model also includes a PLC control system 15. The signal input terminal of the PLC control system 15 is connected to the temperature sensor 16, and the signal output terminal of the PLC control system 15 is connected to the dry ice venting valve 17. A temperature sensor 16 for measuring the circulating water temperature is provided at the bottom of the evaporative condenser body 1, and a dry ice venting valve 17 is provided between the dry ice machine's exhaust pipe 7 and the heat exchange coil 8. This utility model can be controlled manually or automatically, preferably using the above-mentioned automatic control solution. This solution monitors the circulating water temperature in real time through the temperature sensor 16. When the circulating water temperature does not reach the target threshold, the PLC control system 15 controls the dry ice venting valve 17 to be in the open state. When the circulating water temperature reaches the target threshold, the PLC control system 15 controls the dry ice venting valve 17 to be in the open / closed state.

[0030] Furthermore, such as Figure 2 , 5 As shown, the top of the evaporative condenser body 1 is equipped with a gas phase outlet and a carbon dioxide gas concentration detector 18. The carbon dioxide gas concentration detector 18 is connected to the signal input terminal of the PLC control system 15, and the signal output terminal of the PLC control system 15 is connected to the audible and visual alarm 19. When the second technical solution of this utility model is adopted, the carbon dioxide concentration at the outlet of the evaporative condenser body 1 can be detected by setting the carbon dioxide gas concentration detector 18 to avoid the carbon dioxide concentration from being too high and causing harm to the health of on-site personnel. For example, in actual operation, the carbon dioxide gas concentration detector 18 detects the concentration at the gas phase outlet of the evaporative condenser body 1 in real time. When the concentration is greater than 0.5%, the PLC control system 15 controls the audible and visual alarm 19 to start and controls the dry ice air release regulating valve 17 to reduce its opening. When the concentration is greater than 1%, the PLC control system 15 controls the audible and visual alarm 19 to start and controls the dry ice air release regulating valve 17 to close.

[0031] The working principle of this utility model is as follows: the inlet of the refrigerant coil 6 is connected to the high-temperature superheated gaseous refrigerant. The circulating water is transported from the circulating water pipe 3 to the water distribution pipe 5 through the circulating water pump 4, and is evenly sprayed onto the refrigerant coil 6 through the water distribution nozzle in the water distribution pipe 5 to form a water film. The high-temperature superheated refrigerant in the refrigerant coil 6 exchanges heat with the circulating water and air in the refrigerant coil 6, and the high-temperature superheated refrigerant is condensed into a liquid state. The temperature of the liquid refrigerant is 8-10°C lower than the traditional evaporation and condensation temperature. The high-temperature superheated refrigerant in the refrigerant coil 6 condenses and releases heat, while the water outside the refrigerant coil evaporates and absorbs heat, causing some of the circulating water in the water distribution nozzle to turn into water vapor. Under the strong suction of the axial fan 2, the water vapor enters the water collector 14, separating the humid air from the unevaporated water. The humid air is discharged to the upper side of the water collector 14, while the unevaporated water is isolated to the lower side of the water collector 14 and falls to the packing layer, where it undergoes mass transfer and heat exchange with the rising air. Finally, it falls to the bottom of the evaporative condenser body 1 for recycling. When the first technical solution mentioned above is adopted, the vent air in the dry ice machine's exhaust pipe 7 enters the heat exchange coil 8, allowing the circulating water to exchange heat with the heat exchange coil 8. This achieves the utilization of the vent air's cooling capacity and the reduction of the circulating water temperature. After the circulating water temperature is reduced, it is transported from the circulating water pipe 3 to the water distribution pipe 5 via the circulating water pump 4 and evenly sprayed onto the refrigerant coil 6 through the water distribution nozzle in the water distribution pipe 5. The vent air after heat exchange then enters the vent pipe 9 through the heat exchange coil 8 for external discharge. During the above process, the temperature sensor 16 monitors the water temperature of the circulating water in real time. When the water temperature of the circulating water does not reach the target threshold, the PLC control system 15 controls the dry ice air release regulating valve 17 to be in the open state. When the water temperature of the circulating water reaches the target threshold, the PLC control system 15 controls the dry ice air release regulating valve 17 to be in the open / closed state. When the second technical solution mentioned above is adopted, the vented air in the dry ice machine's exhaust pipe 7 enters the heat exchange coil 8, allowing the circulating water to exchange heat with the heat exchange coil 8. After heat exchange, the vented air enters the circulating water through the exhaust port 10, allowing the two to come into full contact and achieve further cooling. After further cooling, the vented air leaves the circulating water and continues to rise, mixing with the rising air from the air inlet 13 to achieve further cooling. The above method can achieve triple utilization of the vented air's cooling capacity. In addition to conventionally detecting the temperature of the circulating water, a carbon dioxide gas concentration detector 18 is also required to detect the carbon dioxide concentration at the outlet of the evaporative condenser body 1 to avoid excessive carbon dioxide concentration from harming on-site personnel. This utility model adopts a comprehensive condensation method using dry ice machine vented air, circulating water, and air to condense the high-temperature superheated gaseous refrigerant into a liquid refrigerant, and the liquid refrigerant is in a subcooled state. It can achieve the characteristics of utilizing the cooling capacity of the dry ice machine's vented air while reducing the energy consumption of the refrigeration compressor.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An evaporative condenser, comprising an evaporative condenser body (1), a gas phase outlet at the top of the evaporative condenser body (1), an axial flow fan (2) at the gas phase outlet, a circulating water pipe (3) on one side of the bottom of the evaporative condenser body (1), the bottom of the circulating water pipe (3) being connected to the bottom of the evaporative condenser body (1), a circulating water pump (4) on the circulating water pipe (3), the end of the circulating water pipe (3) being connected to a water distribution pipe (5) located in the upper part of the evaporative condenser body (1), and a refrigerant coil (6) at the lower part of the water distribution pipe (5), characterized in that: The bottom of the evaporative condenser body (1) is provided with a dry ice machine air heat exchange unit that can exchange heat with circulating water.

2. The evaporative condenser according to claim 1, characterized in that: The dry ice machine exhaust heat exchange unit includes a dry ice machine exhaust pipe (7), which is connected to an exhaust pipe (9) located outside the evaporative condenser body (1) via a heat exchange coil (8) located at the bottom of the evaporative condenser body (1).

3. An evaporative condenser according to claim 1, characterized in that: The dry ice machine exhaust heat exchange unit includes a dry ice machine exhaust pipe (7), which is connected to a heat exchange coil (8) located at the bottom of the evaporative condenser body (1). The bottom of the heat exchange coil (8) is evenly distributed with exhaust holes (10).

4. An evaporative condenser according to claim 2 or 3, characterized in that: The heat exchange coil (8) is set at a height lower than the bottom level of the circulating water inside the evaporative condenser body (1), and a primary water replenishment pipe (11) is provided above the circulating water level.

5. An evaporative condenser according to claim 2 or 3, characterized in that: A packing layer (12) is provided at the middle position of the upper part of the primary water supply pipe (11), and an air inlet (13) is provided on the inner wall of the evaporative condenser body (1) corresponding to the packing layer (12).

6. An evaporative condenser according to claim 2 or 3, characterized in that: A water collector (14) is provided between the axial flow fan (2) and the water distribution pipe (5).

7. An evaporative condenser according to claim 1, characterized in that: It also includes a PLC control system (15), the signal input terminal of the PLC control system (15) is connected to the temperature sensor (16), and the signal output terminal of the PLC control system (15) is connected to the dry ice air release regulating valve (17). The bottom of the evaporative condenser body (1) is equipped with a temperature sensor (16) for measuring the temperature of the circulating water, and a dry ice air venting valve (17) is provided between the dry ice machine exhaust pipe (7) and the heat exchange coil (8).

8. An evaporative condenser according to claim 7, characterized in that: The top of the evaporative condenser body (1) is provided with a gas phase outlet and a carbon dioxide gas concentration detector (18). The carbon dioxide gas concentration detector (18) is connected to the signal input terminal of the PLC control system (15), and the signal output terminal of the PLC control system (15) is connected to the audible and visual alarm (19).

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