Method for accurately controlling temperature and humidity in construction period of liquid cargo tank enclosure structure of LNG (Liquefied Natural Gas) ship

Abstract

The invention relates to the technical field of ship building, discloses an accurate temperature and humidity control method in the construction period of an LNG ship liquid cargo tank enclosure structure, and aims to carry out dynamic closed-loop control based on the difference value between the dew point temperature and the structure surface temperature through real-time monitoring and accurate calculation of the dew point temperature. And it is ensured that the air dew point temperature in the construction space is always lower than the safety margin set by the surface temperature of the enclosure structure, so that the risk of water vapor condensation is eradicated, and the CCS construction quality and reliability are improved. According to the method, accurate and dynamic control over the temperature and humidity in the construction period of the LNG ship liquid cargo tank enclosure structure is achieved, limitation of traditional static or empirical control is overcome, the structure surface temperature is monitored in real time, the dew-point temperature is calculated, it is ensured that the dew-point temperature is always lower than the safety margin of the structure surface temperature, water vapor condensation is effectively prevented, and the safety performance of the structure is improved. And dew point temperature calculation based on an algorithm is adopted, so that the calculation precision and the real-time performance are improved, and errors caused by manual table look-up or estimation are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shipbuilding, in particular to a temperature and humidity control method for a liquid cargo containment system of an LNG carrier during construction. BACKGROUND

[0002] An LNG carrier is a specialized ship used for transporting liquefied natural gas (LNG), which requires the cargo containment system (CCS) to withstand extremely low temperatures (about -162°C). The CCS, typically composed of multiple layers of insulation and barriers, is critical for the safe storage and transportation of LNG. The construction quality of the CCS is crucial for the operational safety and economic efficiency of the LNG carrier. During the construction of the CCS, the control of the temperature and humidity of the construction space (i.e., the area inside or around the containment system where work is being done) is one of the key steps. Since the containment system isolates the low-temperature area of the cargo hold from the outside environment, changes in the temperature and humidity of the external environment, especially the moisture in the air, can easily condense on the surface of the structure below the dew point temperature. Moisture condensation can damage the performance of the insulation material, corrode the structural components, affect subsequent construction processes (such as bonding and welding), and even pose a potential threat to the long-term reliability of the CCS structure.

[0003] Traditional temperature and humidity control during CCS construction usually relies on experience or relatively broad control parameters (e.g., maintaining the temperature in the cabin within a certain range, and the relative humidity below a certain threshold, such as 20-30°C, RH<70%). This method fails to consider the actual temperature changes on the surface of the structure and does not achieve precise control of the dew point temperature. The temperature of the structure surface is affected by various factors, such as the ambient temperature, the temperature of the ship body, temporary heating / cooling measures, and the progress of construction, which can be much lower than the temperature of the ambient air. Simply controlling the temperature and humidity of the air within a fixed or relatively wide range cannot ensure that the dew point temperature is always lower than the temperature of the structure surface, thus failing to effectively prevent condensation. In addition, the traditional control method often relies on manual monitoring and adjustment, lacking real-time and accuracy, especially under complex external environmental changes (winter, summer, day-night temperature difference, extreme weather), making it difficult to respond effectively.

[0004] Therefore, the prior art lacks an effective control system and method that can dynamically adjust the temperature and humidity in real time and accurately according to the actual temperature changes of the construction space environment and the structure surface, and ensure that the dew point temperature is always lower than the safety margin of the structure surface.

[0005] The patent application with the publication number CN104456854A discloses an air wet temperature control method and system for a swimming room in a ship, which comprises the following steps: measuring a dew point temperature value; performing a refrigeration dehumidification treatment when the dew point temperature value is greater than a preset dew point temperature value; stopping the refrigeration dehumidification treatment when the dew point temperature value after the refrigeration dehumidification treatment is equal to the preset dew point temperature value; measuring an ambient temperature value; performing a heating treatment when the ambient temperature value is less than a preset ambient temperature value, and performing a cooling treatment when the ambient temperature value is greater than the preset ambient temperature value.

[0006] The prior art uses a single dehumidification heat pump system to control the dew point temperature in the ship by refrigeration dehumidification, controls the temperature in the ship by the condensation heat of the dehumidification heat pump system and auxiliary heating of an external hot / cold water source air pipe type radiator, does not involve outdoor fresh air, does not control the relative humidity of the air outlet of the dehumidification heat pump system, and does not provide a detailed structure of the accurate temperature and humidity control system, specific operation and use method, and cannot realize accurate cabin temperature and humidity field control in a fresh air environment.

[0007] Therefore, a new technical solution is needed to solve the above technical problems. SUMMARY

[0008] The purpose of the present application is to provide a temperature and humidity control method for LNG ship liquid cargo tank enclosure construction, which realizes accurate and dynamic control of the temperature and humidity during LNG ship liquid cargo tank enclosure construction, overcomes the limitations of traditional static or empirical control, ensures that the dew point temperature is always lower than the safety margin (3-5℃) of the structure surface temperature by real-time monitoring of the structure surface temperature and calculation of the dew point temperature, effectively prevents water vapor condensation, fundamentally solves the construction quality hidden danger, improves the calculation accuracy and real-time performance by using algorithm-based dew point temperature calculation, and avoids the errors of manual table lookup or estimation.

[0009] The technical solution adopted by the present application is as follows: The temperature and humidity accurate control method for LNG ship liquid cargo tank enclosure construction comprises the following steps: Step a: in the LNG ship liquid cargo tank enclosure construction space, real-time collection of the air temperature T1 and relative humidity RH in the space is performed by a sensor; Step b: real-time monitoring of the temperature T2 of the inner wall and the enclosure structure surface in the cabin is performed by a sensor, and the structure surface is a surface that may appear condensation in the construction process; Step c: the collected air temperature T1, relative humidity RH and structure surface temperature T2 data are input to a control system; Step d: the control system uses a preset algorithm to accurately calculate the dew point temperature T3 of the air in real time according to the input air temperature T1, relative humidity RH, and environmental air pressure and other factors; Step e: the control system compares the calculated dew point temperature T3 with the monitored structure surface temperature T2; Step f: according to the comparison result, the control system dynamically adjusts the temperature and humidity of the air entering the construction space to make the structure surface temperature T2 higher than the dew point temperature T3 by at least 3℃; Step g: during the construction of the LNG ship liquid cargo tank enclosure structure in winter, summer, and extreme weather and other different external environmental conditions, steps a to f are performed.

[0010] By using the above method, the temperature and humidity of the LNG ship liquid cargo tank enclosure structure during construction are accurately and dynamically controlled, overcoming the limitations of traditional static or empirical control. By monitoring the structure surface temperature in real time and calculating the dew point temperature, the safety margin (3-5℃) between the dew point temperature and the structure surface temperature is ensured, effectively preventing water vapor condensation, and fundamentally solving the construction quality problems. The dew point temperature calculation based on algorithm improves the calculation accuracy and real-time performance, avoiding the errors of manual table lookup or estimation Preferably, the sensors in steps a and b include a plurality of high-precision temperature sensors arranged in the construction space for collecting T1, a plurality of high-precision humidity sensors for collecting RH, and a plurality of temperature sensors arranged on the surface of the enclosure structure for monitoring T3.

[0011] By using the above structure, the oxygen content in the construction space is monitored by the sensor, and an alarm is issued when the oxygen content is below the safety threshold.

[0012] Preferably, the control system of steps d and e includes a processor or computing unit for receiving sensor data, executing the dew point temperature calculation algorithm of step d and the comparison logic of step e.

[0013] By using the above structure, the data of the monitoring module can be received, the preset algorithm can be executed to accurately calculate the dew point temperature of the air in real time, and the calculation result can be compared with the structure surface temperature.

[0014] Preferably, in step f, the structure surface temperature T2 is controlled to be 3-5℃ higher than the dew point temperature T3, and the temperature and humidity of the air in step f are adjusted by an air handling and circulation system.

[0015] Preferably, the air treatment and circulation system comprises: a fresh air filter, a dehumidification wheel, a regeneration air heater, a chemical filter, a pre-evaporator, a post-evaporator, a pre-condensed heat recovery heat exchanger, a post-condensed heat heat exchanger, a supply fan, a return air inlet, part of the air extracted from the construction space enters the return air inlet as return air, additional air is introduced into the fresh air filter as fresh air, the dehumidification wheel is arranged behind the fresh air filter, the regeneration air heater is arranged behind the dehumidification wheel, the mixed air entering the fresh air filter and the return air inlet passes through the chemical filter, the pre-evaporator, the post-evaporator, the pre-condensed heat recovery heat exchanger, the post-condensed heat heat exchanger in sequence, and is sent back to the construction space from the supply fan, the fresh air filter, the dehumidification wheel and the regeneration air heater are connected to an air treatment and adjustment module, and the air treatment and adjustment module is connected to a control module.

[0016] Preferably, the temperature and humidity control system in the construction space of the enclosure comprises a special dehumidifier arranged in the cabin, a dehumidifier base, an upper left air pipe in the cabin, an upper right air pipe in the cabin, a lower left air pipe in the cabin and a lower right air pipe in the cabin, the special dehumidifier is communicated with the upper left air pipe in the cabin and the upper right air pipe in the cabin through a supply air return pipe, and is communicated with the lower left air pipe in the cabin and the lower right air pipe in the cabin through a return air supply pipe, a sensor and a monitoring module are arranged in the cabin, and a side door is arranged on the cabin.

[0017] Preferably, the special dehumidifier comprises a screw compressor, a condensed heat heat exchanger, a heat dissipation condenser and an evaporator, the screw compressor is connected to a four-way reversing valve, the four-way reversing valve is connected to the evaporator, a condensed heat recovery control valve and a condensed heat control valve, the condensed heat recovery control valve and the condensed heat control valve are connected to the heat dissipation condenser, the condensed heat recovery control valve and the heat dissipation condenser are provided with the condensed heat heat exchanger, the heat dissipation condenser is connected to the evaporator, and a refrigeration expansion valve, a refrigeration check valve, a heat pump check valve and a heat pump expansion valve are arranged between the heat dissipation condenser and the evaporator, a control module is arranged in the special dehumidifier, and the control module is connected to a monitoring module and a man-machine interface.

[0018] By adopting the above structure, the dew point temperature is monitored and calculated in real time, and dynamic closed-loop control is carried out based on the difference between the dew point temperature and the surface temperature of the structure, so that the dew point temperature of the air in the construction space is always lower than the safety margin set for the surface temperature of the enclosure, thereby eliminating the risk of water vapor condensation and improving the CCS construction quality and reliability.

[0019] Compared with the prior art, the present application has the following beneficial effects: 1. The method of the present application realizes accurate and dynamic control of temperature and humidity during LNG ship liquid cargo tank enclosure construction, overcomes the limitations of traditional static or empirical control, ensures that the dew point temperature is always lower than the safety margin (3-5℃) of the structure surface temperature by real-time monitoring of the structure surface temperature and calculating the dew point temperature, effectively prevents water vapor condensation, fundamentally solves the construction quality hidden danger, uses dew point temperature calculation based on algorithm to improve calculation accuracy and real-time performance, and avoids errors caused by manual table lookup or estimation 2. In the method of the present application, the control system has self-adaptive adjustment capability for different external environments (winter, summer, extreme weather) and construction condition changes, integrates fresh air and return air control as well as heating, cooling and dehumidification equipment, can flexibly adjust temperature and humidity according to actual needs, and realizes energy-saving operation.

[0020] 3. In the device of the present application, the HMI interface provides real-time monitoring and convenient operation, the early warning mechanism timely prompts the risk, improves the reliability and safety of the system, the oxygen content monitoring and the use of chemical filter improve the air quality and personnel safety of the construction space, significantly improve the quality and efficiency of LNG ship CCS construction, and guarantee the long-term performance of the CCS structure. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 Figure 1 is a device diagram of the temperature and humidity accurate control system of the present application during LNG ship liquid cargo tank enclosure construction; Fig. 2 Figure 2 is an air principle diagram of the temperature and humidity accurate control system of the present application; Fig. 3 Figure 3 is a position structure diagram of the refrigeration-heat pump unit system in the special dehumidifier of the present application.

[0022] 1. Special dehumidifier; 2. Dehumidifier base; 3. Supply / return air pipe; 4. Return / supply air pipe; 5. In-cabin upper left air pipe; 6. In-cabin upper right air pipe; 7. In-cabin lower left air pipe; 8. In-cabin lower right air pipe; 9. Ship cabin; 10. Side door; 11. Sensor; 12. Monitoring module; 13. Control module; 14. Human-machine interface; 15. Air treatment and adjustment module; 21. Fresh air filter; 22. Dehumidification runner; 23. Regeneration air heater; 24. Chemical filter; 25. Pre-evaporator; 26. Post-evaporator; 27. Pre-condensation heat recovery heat exchanger; 28. Post-condensation heat exchanger; 29. Supply fan; 30. Return air outlet; 31. Screw compressor; 32. Four-way reversing valve; 33. Condensation heat recovery control valve; 34. Condensation heat exchanger; 35. Condensation heat control valve; 36. Radiator condenser; 37. Refrigeration expansion valve; 38. Refrigeration check valve; 39. Heat pump check valve; 40. Heat pump expansion valve; 41. Evaporator. DETAILED DESCRIPTION

[0023] As Figs. 1-3 shown, the LNG ship liquid cargo tank enclosure construction period temperature and humidity accurate control method, characterized in that: comprising the following steps: Step a: in the LNG ship liquid cargo tank enclosure construction space, through the sensor 11 real-time collection of the space of the air temperature T1 and relative humidity RH; Step b: through the sensor 11 real-time monitoring of the cabin inner wall and the temperature T2 of the enclosure surface, the structure surface is the surface that may appear condensation in the construction process; Step c: the air temperature T1, relative humidity RH and the structure surface temperature T2 data collected are input to the control system; Step d: the control system uses the preset algorithm, according to the input of the air temperature T1 and relative humidity RH and environmental pressure and other factors, real-time accurate calculation of the dew point temperature T3 of the air; Step e: the control system compares the calculated dew point temperature T3 with the monitored structure surface temperature T2; Step f: according to the comparison result, the control system dynamically adjusts the temperature and humidity of the air entering the construction space, so that the structure surface temperature T2 is at least 3℃ higher than the dew point temperature T3; Step g: in the winter, summer and extreme weather and other different external environmental conditions during the LNG ship liquid cargo tank enclosure construction period, execute the above steps a to step f.

[0024] The sensor 11 in step a and step b includes a plurality of high-precision temperature sensors arranged in the construction space for collecting T1, a plurality of high-precision humidity sensors for collecting RH, and a plurality of temperature sensors arranged on the enclosure surface for monitoring T3.

[0025] The control system of step d, step e includes a processor or computing unit for receiving sensor data, executing dew point temperature calculation algorithm of step d and comparison logic of step e.

[0026] In step f, the structure surface temperature T2 is controlled to be 3℃ to 5℃ higher than the dew point temperature T3, and the temperature and humidity of the air in step f are adjusted by an air handling and circulating system. When the difference between the calculated dew point temperature T3 and the monitored structure surface temperature T2 is close to or less than the set safety threshold (for example, less than 3℃), the control system in the control module 13 triggers an alarm signal.

[0027] The air treatment and circulation system comprises: a fresh air filter 21, a dehumidification wheel 22, a regeneration air heater 23, a chemical filter 24, a pre-stage evaporator 25, a post-stage evaporator 26, a pre-stage condensation heat recovery heat exchanger 27, a post-stage condensation heat heat exchanger 28, a supply fan 29, and a return air inlet 30. Part of the air extracted from the construction space enters the return air inlet 30 as return air, and additional air is introduced into the fresh air filter 21 as fresh air. The dehumidification wheel 22 is arranged behind the fresh air filter 21, and the regeneration air heater 23 is arranged behind the dehumidification wheel 22. The mixed air from the fresh air filter 21 and the return air inlet 30 passes through the chemical filter 24, the pre-stage evaporator 25, the post-stage evaporator 26, the pre-stage condensation heat recovery heat exchanger 27, and the post-stage condensation heat heat exchanger 28 in sequence, and is then sent back to the construction space by the supply fan 29. The fresh air filter 21, the dehumidification wheel 22, and the regeneration air heater 23 are connected to the air treatment and conditioning module 15, and the air treatment and conditioning module 15 is connected to the control module 13. The air treatment and conditioning module 15 is connected to the control module 13, and is used to adjust the temperature and humidity of the air entering the construction space according to the instructions of the control module 13. The air treatment and conditioning module 15 further comprises a chemical filter for chemically filtering the air entering the construction space.

[0028] The temperature and humidity control system for the construction space of the enclosure comprises a special dehumidifier 1 arranged in the cabin 9, a dehumidifier base 2, an upper left air duct 5 in the cabin, an upper right air duct 6 in the cabin, a lower left air duct 7 in the cabin, and a lower right air duct 8 in the cabin. The special dehumidifier 1 is connected to the upper left air duct 5 and the upper right air duct 6 in the cabin through the air supply and return duct 3, and is connected to the lower left air duct 7 and the lower right air duct 8 in the cabin through the air return and supply duct 4. The cabin 9 is provided with a sensor 11 and a monitoring module 12, and the cabin 9 is provided with a side door 10. The monitoring module 12 further comprises a sensor for monitoring the oxygen content in the construction space, and the control module 13 is configured to issue an alarm when the oxygen content is below a safety threshold.

[0029] The dedicated dehumidifier 1 includes a screw compressor 31, a condensation heat exchanger 34, a heat dissipation condenser 36, an evaporator 41, a four-way reversing valve 32 connected to the screw compressor 31, the four-way reversing valve 32 connected to the evaporator 41, a condensation heat recovery control valve 33, a condensation heat control valve 35, the condensation heat recovery control valve 33 and the condensation heat control valve 35 connected to the heat dissipation condenser 36, the condensation heat recovery control valve 33 and the heat dissipation condenser 36 provided with the condensation heat exchanger 34, the heat dissipation condenser 36 connected to the evaporator 41, the heat dissipation condenser 36 and the evaporator 41 provided with a refrigeration expansion valve 37, a refrigeration check valve 38, a heat pump check valve 39 and a heat pump expansion valve 40, the dedicated dehumidifier 1 provided with a control module 13, and the control module 13 connected to a monitoring module 12 and a human-machine interface 14. Real-time monitoring data (including T2, RH, T2 and T3) and parameter setting and adjustment functions are provided through the human-machine interface 41 (HMI). The human-machine interface 14 (HMI) is connected to the control module 13, used for displaying real-time data and system status, and allowing an operator to set and adjust parameters.

[0030] When the application is used, in summer high temperature and high humidity conditions: mainly through cooling and refrigeration dehumidification to reduce air temperature and humidity, so that the dew point temperature is greatly reduced. In winter low temperature conditions: mainly through heating air, and if the humidity is too high, dehumidification is needed (possibly using a rotary dehumidifier), the core is to prevent structure low temperature surface condensation. In transition season or large diurnal temperature range conditions: the control system dynamically switches heating / cooling / dehumidification mode according to real-time monitoring data, and accurately maintains temperature and humidity in the target range. Always take keeping the structure surface temperature 3-5℃ higher than the dew point temperature as the primary control target, and other temperature and humidity parameters are means to serve this target.

[0031] The content displayed on the HMI interface includes various real-time parameters, historical curves, alarm information, system state diagram, etc.) and how the operator sets parameters, selects modes and troubleshoots through the HMI. The triggering condition and alarm mode of the early warning mechanism when the surface temperature of the structure in the cabin is 3℃ higher than the dew point temperature in the cabin. Adjust the opening of the fresh air valve for real-time adjustment when the oxygen content monitoring is lower than the set value, and the chemical filter runs for 24 hours. The dedicated dehumidifier realizes data storage and remote access through information technology (such as cloud platform).

[0032] The application provides a temperature and humidity accurate control method for a liquid cargo tank enclosure structure of an LNG ship during construction, aiming to ensure that the air dew point temperature in the construction space is always lower than the safety margin of the set surface temperature of the enclosure structure by monitoring in real time, accurately calculating the dew point temperature, and performing dynamic closed-loop control based on the difference between the dew point temperature and the surface temperature of the structure, thereby eliminating the risk of water vapor condensation and improving the CCS construction quality and reliability. The temperature and humidity accurate control method can overcome the shortcomings of the prior art, such as a wide temperature and humidity parameter range, insufficient control accuracy, and inability to effectively prevent condensation, and accurately adjusts the temperature and humidity of the construction space.

[0033] The above-described embodiments are merely preferred embodiments of the application and are not intended to limit the scope of the application. Various modifications and improvements to the technical solutions of the application made by those skilled in the art without departing from the design spirit of the application shall fall within the protection scope of the application as defined by the claims.

Claims

1. A method for precise temperature and humidity control during the construction of the LNG carrier cargo tank containment structure, characterized by: Includes the following steps: Step a: Within the construction space of the LNG carrier's cargo tank enclosure structure, the air temperature T1 and relative humidity RH within the space are collected in real time using sensors; Step b: Monitor the temperature T2 of the inner wall and enclosure structure surface of the cabin in real time using sensors. The structure surface is a surface where condensation may occur during construction. Step c: Input the collected air temperature T1, relative humidity RH, and structure surface temperature T2 data into the control system; Step d: The control system uses a preset algorithm to accurately calculate the dew point temperature T3 of the air in real time based on the input air temperature T1, relative humidity RH, and ambient air pressure. Step e: The control system compares the calculated dew point temperature T3 with the monitored structural surface temperature T2; Step f: Based on the comparison results, the control system dynamically adjusts the temperature and humidity of the air entering the construction space so that the surface temperature T2 of the structure is at least 3°C ​​higher than the dew point temperature T3. Step g: During the construction of the LNG carrier's cargo tank containment structure, under different external environmental conditions such as winter, summer, and extreme weather, perform steps a to f above.

2. The method for precise temperature and humidity control during the construction of the LNG carrier cargo tank containment structure according to claim 1, characterized in that: The sensors in steps a and b include multiple high-precision temperature sensors arranged in the construction space to collect T1, multiple high-precision humidity sensors to collect RH, and multiple temperature sensors arranged on the surface of the enclosure structure to monitor T3.

3. The method for precise temperature and humidity control during the construction of the LNG carrier cargo tank containment structure according to claim 1, characterized in that: The control system in steps d and e includes a processor or computing unit for receiving sensor data, executing the dew point temperature calculation algorithm in step d, and the comparison logic in step e.

4. The method for precise temperature and humidity control during the construction of the LNG carrier cargo tank containment structure according to claim 1, characterized in that: In step f, the surface temperature T2 of the structure is controlled to be 3°C to 5°C higher than the dew point temperature T3. The temperature and humidity of the air in step f are adjusted by an air handling and circulation system.

5. The method for precise temperature and humidity control during the construction of the LNG carrier cargo tank containment structure according to claim 4, characterized in that: The air handling and circulation system includes: a fresh air filter, a dehumidifying impeller, a regenerating air heater, a chemical filter, a pre-stage evaporator, a post-stage evaporator, a pre-stage condensing heat recovery heat exchanger, a post-stage condensing heat exchanger, a supply fan, and a return air vent. Part of the air drawn from the construction space is returned to the return air vent, and supplementary air is introduced as fresh air into the fresh air filter. The dehumidifying impeller is located behind the fresh air filter, and the regenerating air heater is located behind the dehumidifying impeller. The mixed air introduced from the fresh air filter and the return air vent passes sequentially through the chemical filter, the pre-stage evaporator, the post-stage evaporator, the pre-stage condensing heat recovery heat exchanger, and the post-stage condensing heat exchanger, before being returned to the construction space by the supply fan. The fresh air filter, the dehumidifying impeller, and the regenerating air heater are connected to the air handling and regulation module, which is connected to the control module.

6. The method for precise temperature and humidity control during the construction of the LNG carrier cargo tank containment structure according to claim 1, characterized in that: The temperature and humidity control system within the construction space of the enclosure structure includes a dedicated dehumidifier installed in the cabin, a dehumidifier foundation, an upper left duct, an upper right duct, a lower left duct, and a lower right duct. The dedicated dehumidifier is connected to the upper left and upper right ducts of the cabin via supply and return air ducts, and to the lower left and lower right ducts of the cabin via return and supply air ducts. Sensors and monitoring modules are installed inside the cabin, and a side door is provided in the cabin.

7. The method for precise temperature and humidity control during the construction of the LNG carrier cargo tank containment structure according to claim 6, characterized in that: The dedicated dehumidifier includes a screw compressor, a condensing heat exchanger, a radiating condenser, and an evaporator. A four-way reversing valve is connected to the screw compressor. The four-way reversing valve is connected to the evaporator, a condensing heat recovery control valve, and a condensing heat control valve. Both the condensing heat recovery control valve and the condensing heat control valve are connected to the radiating condenser. A condensing heat exchanger is installed between the condensing heat recovery control valve and the radiating condenser. The radiating condenser is connected to the evaporator. A refrigeration expansion valve, a refrigeration check valve, a heat pump check valve, and a heat pump expansion valve are installed between the radiating condenser and the evaporator. The dedicated dehumidifier has a built-in control module, which is connected to a monitoring module and a human-machine interface.

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