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CN-121977251-A - Industrial dual-mode heat exchange cooling and heating air conditioning system and control method thereof

CN121977251ACN 121977251 ACN121977251 ACN 121977251ACN-121977251-A

Abstract

The application relates to the field of industrial air conditioners, in particular to an industrial dual-mode heat exchange cooling and heating air conditioning system and a control method thereof. The four-way reversing valve comprises a compressor, a four-way reversing valve, an indoor heat exchanger, an air cooling module and a water cooling module, wherein four interfaces of the four-way reversing valve are respectively connected with an exhaust port of the compressor, a return port of the compressor, a first interface of the indoor heat exchanger and a first pipeline, an inlet of the air cooling module is connected with the four-way reversing valve through the first pipeline, an outlet of the air cooling module is connected with a second pipeline, the water cooling module comprises a water tank, a heat exchange pipe group, a water pump, a water distributor, a filler layer and a cooling fan, and the water tank is provided with a water level gauge. The application enforces the serial heat dissipation flow of pre-cooling by air cooling and deep cooling by water cooling, and precisely controls the temperature of the refrigerant at the air cooling outlet to be in a reasonable interval, and the system can maximally utilize the advantages of two heat dissipation modes during refrigeration.

Inventors

  • LIU SHANFENG

Assignees

  • 航兴智能科技(东莞)有限公司

Dates

Publication Date
20260505
Application Date
20260210

Claims (10)

  1. 1. An industrial dual-mode heat exchange cooling and heating air conditioning system, comprising: the device comprises a compressor, a four-way reversing valve, an indoor heat exchanger, an air cooling module and a water cooling module; the four interfaces of the four-way reversing valve are respectively connected with an exhaust port of the compressor, a return port of the compressor, a first interface of the indoor heat exchanger and a first pipeline; The inlet of the air cooling module is connected with the four-way reversing valve through the first pipeline, and the outlet of the air cooling module is connected with the second pipeline; The water cooling module comprises a water tank, a heat exchange tube group, a water pump, a water distributor, a packing layer and a cooling fan; the water tank is provided with a water level gauge, the heat exchange tube group is accommodated in the water tank, the inlet of the heat exchange tube group is connected with the outlet of the air cooling module through the second pipeline, the outlet of the heat exchange tube group is connected with a third pipeline, the water inlet of the water pump is communicated with the inside of the water tank, the water outlet of the water pump is connected with the water distributor, the water distributor and the packing layer are arranged above the water tank, and the cooling fan is arranged on the side part or the top of the packing layer and is used for driving air to flow through the packing layer; the second interface of the indoor heat exchanger is connected with the outlet of the heat exchange tube group through the third pipeline; The system also comprises a control unit, wherein the control unit is electrically connected with the compressor, the four-way reversing valve, the air cooling module, the water pump, the cooling fan and the water level gauge.
  2. 2. The industrial dual-mode heat exchange cold and warm air conditioning system according to claim 1, wherein the air cooling module comprises an air cooling heat exchanger and a module fan for driving air to flow through the air cooling heat exchanger, and the module fan of the air cooling module and the cooling fan of the water cooling module are arranged independently to form two sets of air paths which are isolated from each other in space and air flow organization.
  3. 3. The industrial dual-mode heat exchange cooling and heating air conditioning system according to claim 1, wherein the water tank is further provided with a temperature sensor for detecting the temperature of water in the water tank, and the temperature sensor is electrically connected with the control unit.
  4. 4. The industrial dual-mode heat exchange cooling and heating air conditioning system according to claim 1, wherein a drain valve is arranged at the bottom of the water tank and is electrically connected with the control unit.
  5. 5. The dual-mode heat exchange air conditioning system according to claim 1, wherein the filler layer is a honeycomb or corrugated paper filler.
  6. 6. A control method for the industrial dual-mode heat exchange cooling and heating air conditioning system according to any one of claims 1 to 5, characterized by comprising the steps of: S1, responding to a selection instruction of a refrigerating mode or a heating mode, controlling the four-way reversing valve to correspondingly switch, and starting the compressor; If the refrigerating mode is selected, the four-way reversing valve is controlled to be switched to a first state so as to form a circulating passage for enabling the refrigerant to sequentially flow through the compressor, the air cooling module, the heat exchange tube group of the water cooling module and the indoor heat exchanger; if a heating mode is selected, the four-way reversing valve is controlled to be switched to a second state so as to form a circulating passage for enabling the refrigerant to sequentially flow through the compressor, the indoor heat exchanger, the heat exchange tube group of the water cooling module and the air cooling module; and S2, according to the mode selected in the step S1, executing a heat radiation device control process corresponding to the mode.
  7. 7. The control method according to claim 6, wherein when the cooling mode is selected in step S1, the radiator control process in step S2 includes the steps of: The high-temperature refrigerant discharged by the compressor is controlled to flow through the air cooling module firstly; Monitoring the ambient temperature Ta, and controlling the operation of the air cooling module to ensure that the refrigerant temperature Tf flowing out of the air cooling module meets the conditions that Ta+5 ℃ is less than or equal to Tf and less than or equal to Ta+15 ℃; monitoring the water temperature Tw in the water tank; and when the water temperature Tw reaches or is higher than a first water temperature threshold T1, starting a water pump and a cooling fan of the water cooling module.
  8. 8. The control method according to claim 7, wherein after the water pump and the cooling fan of the water cooling module are started, the control process further comprises the steps of: Continuously monitoring the water temperature Tw; when the water temperature Tw falls below a second water temperature threshold T2, the water pump and the cooling fan are turned off, wherein T2 < T1.
  9. 9. The control method according to claim 7, characterized by further comprising, before step S1, a pre-judgment step of: Acquiring the current load rate L and the ambient temperature Ta of the system; and if the load rate L is lower than a preset load threshold value and the ambient temperature Ta is lower than a preset temperature threshold value, controlling a water pump and a cooling fan of the water cooling module to be kept closed when a refrigeration mode is executed.
  10. 10. The control method according to claim 6, wherein when the heating mode is selected in step S1, the heat sink control process in step S2 includes the steps of: And controlling the drain valve of the water tank to be opened so as to drain water in the water tank, and controlling the water pump and the cooling fan of the water cooling module to be closed.

Description

Industrial dual-mode heat exchange cooling and heating air conditioning system and control method thereof Technical Field The application relates to the field of industrial air conditioners, in particular to an industrial dual-mode heat exchange cooling and heating air conditioning system and a control method thereof. Background In the field of industrial refrigeration and air conditioning, in order to ensure efficient and stable operation of a compressor in refrigeration cycle, the compressed high-temperature high-pressure gaseous refrigerant must be effectively cooled and condensed. The refrigerant heat dissipation technology commonly adopted in the current industry is mainly divided into an air-cooled system and a water-cooled system, and the two systems have fundamental differences in principle, structure and application scene. The core device of the air-cooled heat dissipation system mainly depends on ambient air as a cooling medium, is a finned tube type heat exchanger, and makes the ambient air flow through the fin surfaces of the heat exchanger through forced ventilation (usually driven by an axial flow fan), so that heat of refrigerant in the tube is taken away. The technology has the remarkable advantages that the system is relatively simple in structure, no additional water circulation loop and related auxiliary equipment are needed, so that daily operation and maintenance work is very few, the common problems of scaling, corrosion, leakage, freezing in winter and the like of the water system are basically avoided, and the technology has certain attractive force in the aspects of maintenance convenience and initial investment cost. However, the heat dissipation capability of air-cooled systems presents an inherent bottleneck that is difficult to overcome. The heat exchange efficiency is seriously dependent on the logarithmic average temperature difference between the refrigerant and the air, the flow rate and the flow velocity of the air side, the cleanliness of the surface of the fin and the dry bulb temperature of the air. In hot summer, especially under the working condition that a large amount of process waste heat exists in an industrial factory building to cause the ambient air temperature to be high, the cooling potential of the air serving as a cooling medium is greatly reduced. At this time, the temperature difference between the refrigerant and the ambient air is remarkably reduced, which directly results in a sharp reduction in heat transfer amount per unit time according to the basic law of heat transfer. Even if the air quantity of the fan is increased to increase the air flow rate, the marginal effect of heat transfer enhancement is rapidly reduced, and the huge power consumption of the fan is accompanied. The end result is that the refrigerant temperature and pressure at the outlet of the air cooled heat exchanger are still maintained at a higher level, which makes the compressor face a higher exhaust gas back pressure, the same refrigeration capacity has to be maintained with a larger compression ratio and power consumption, the overall energy efficiency ratio of the system is significantly deteriorated, and even overload protection of the compressor can be triggered, and the reliability of continuous operation of the equipment is affected. In the water-cooled technology, water is used as an intermediate cooling medium, and a water circulation system is built through a closed or open cooling tower. In a typical industrial water cooling unit, high-temperature refrigerant firstly transfers heat to circulating cooling water in a water cooling heat exchanger (usually a shell-and-tube or plate-type heat exchanger), the heated cooling water is pumped to the top of a cooling tower, direct contact heat and mass transfer is carried out between the cooling water and air flowing upwards in the tower through a spraying device, the water temperature is effectively reduced by utilizing vaporization latent heat absorbed by partial evaporation of the cooling water, and the cooled water is recycled to the water cooling heat exchanger for reuse. The process fully utilizes the high specific heat capacity of water and the huge heat dissipation potential of evaporative cooling, so that the refrigerant can be stably cooled to a level which is closer to the temperature of an environmental wet bulb, the load of a compressor is effectively reduced, and the running efficiency of a system is improved. However, the cost of such high performance is the high complexity and continuous operational burden of the system. The cooling tower and its matched system includes several parts of water pump, water distributor, stuffing, water collector, tower blower, water tank, water treating device, etc. and has large occupied area, high initial investment, continuous maintenance and management, including regular replenishment of water loss caused by evaporation and drift, chemical addition to prevent scale formation, inh