Dual-system frequency-conversion energy-saving temperature and humidity regulation and control equipment

Abstract

The utility model discloses a dual-system variable-frequency energy-saving temperature and humidity regulation and control device, and solves the problems of frosting, unstable temperature and humidity control and the like of the conventional storage environment regulation and control device. The equipment comprises a fixed-frequency compression system and a variable-frequency compression system which are connected into respective circulation loops through a compressor assembly, a heat exchange assembly, a liquid storage assembly, a valve assembly and a fan assembly. The fixed-frequency system has a refrigeration and dehumidification mode, and the variable-frequency system has a refrigeration and heating mode. The equipment is further provided with a sensing module, and after data are transmitted to the central controller for operation, an operation mode is output. The outdoor unit heat exchanger is uniquely designed, the problem of bottom frosting is solved, wide-range temperature and humidity stable control is achieved, frequency conversion adjustment and energy conservation are achieved, draught fans are shared, initial investment is saved, and the system is widely applied to the field of storage environment control.

Description

Technical Field

[0001] This utility model relates to the field of warehouse environment control technology, and in particular to a dual-system frequency conversion energy-saving temperature and humidity control device. Background Technology

[0002] In the field of warehousing environment control, maintaining stable and suitable temperature and humidity conditions is crucial for the storage quality of goods. Currently, air-cooled control equipment faces many challenges in practical applications. Especially under low-temperature heating operation, due to the equipment's own structure and airflow characteristics, the airflow at the bottom of the heat exchanger is relatively small. This directly leads to the equipment being prone to frosting, and once frosted, it is difficult to defrost effectively.

[0003] To address this frosting problem, existing defrosting methods primarily involve automatically shutting down the equipment when the ambient temperature and the outdoor unit's coil temperature fall below a preset value, thus preventing frost formation. However, while this approach can prevent frost formation to some extent, it introduces more serious problems. After the equipment stops, the cooling or heating capacity in the storage room rapidly decreases, and the temperature and humidity within the storage room fluctuate significantly, failing to meet the stringent temperature and humidity control requirements of the storage environment, thereby affecting the storage quality and shelf life of the goods.

[0004] Furthermore, single-system heat pumps also have significant drawbacks during defrosting. Water generated during defrosting in the upper part of the outdoor unit's heat exchanger flows down the fins to the bottom of the exchanger. This low-temperature water further lowers the temperature at the bottom, leading to incomplete defrosting, accelerated frost formation, and reduced heat exchange efficiency. These problems not only affect the local performance of the heat exchanger but also negatively impact the overall heat exchange performance, ultimately resulting in decreased overall operating efficiency, increased energy consumption, and an inability to meet the demands of efficient and stable operation in storage environments.

[0005] In conclusion, developing a storage environment control device that can effectively solve the frosting problem, achieve precise temperature and humidity control, and has efficient heat exchange performance has become a key issue that urgently needs to be addressed in this field. Utility Model Content

[0006] The purpose of this utility model is to provide a dual-system variable frequency energy-saving temperature and humidity control device. Through innovative system design and collaborative operation mechanism, it overcomes the frosting problem faced by existing warehouse environment control equipment, achieves accurate and stable control of temperature and humidity over a wide range, significantly improves the heat exchange performance and operating efficiency of the equipment, and reduces energy consumption and initial investment costs, thus fully meeting the stringent requirements of the warehouse environment for control equipment.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a dual-system variable frequency energy-saving temperature and humidity control device, comprising a fixed-frequency compression refrigeration and dehumidification system A and a variable-frequency compression heat pump system B; both the fixed-frequency compression refrigeration and dehumidification system A and the variable-frequency compression heat pump system B are installed on the outdoor air-cooled unit side; it also includes a compressor assembly, a heat exchange assembly, a liquid storage assembly, a valve assembly, and a fan assembly; the fixed-frequency compression refrigeration and dehumidification system A and the variable-frequency compression heat pump system B form their respective circulation loops through the connection of the compressor assembly, heat exchange assembly, liquid storage assembly, and valve assembly.

[0008] As a further improvement to the technical solution of this utility model, the compressor assembly includes a fixed-frequency compressor and a variable-frequency compressor; the heat exchange assembly includes heat exchanger one, heat exchanger two, and heat exchanger three; the liquid storage assembly includes liquid storage tank one and liquid storage tank two; the valve assembly includes a four-way valve, electronic expansion valve one, electronic expansion valve two, thermostatic expansion valve, solenoid valve one, and solenoid valve two; the outlet of the fixed-frequency compressor is connected to the inlet end of system A of heat exchanger one, the outlet end of system A of heat exchanger one is connected to the inlet of liquid storage tank one, the outlet of liquid storage tank one is connected to solenoid valve one and the inlet of heat exchanger three respectively, the outlet of heat exchanger three is connected to solenoid valve two, the outlets of solenoid valve one and solenoid valve two are connected together to the thermostatic expansion valve, the outlet of the thermostatic expansion valve is connected to the inlet end of system A of heat exchanger two, and the outlet end of system A of heat exchanger two is connected to the inlet of the fixed-frequency compressor.

[0009] As a further improvement to the technical solution of this utility model, the outlet of the variable frequency compressor is connected to the inlet of the four-way valve. The outlets of the four-way valve are respectively: outlet one is connected to the inlet of the heat exchanger system B section, outlet two is connected to the inlet of the variable frequency compressor, outlet three is connected to the outlet of the heat exchanger system B section, the outlet of the heat exchanger system B section is connected to the inlet of the electronic expansion valve one, the outlet of the electronic expansion valve one is connected to the inlet of the liquid receiver two, the outlet of the liquid receiver two is connected to the inlet of the electronic expansion valve two, and the outlet of the electronic expansion valve two is connected to the inlet of the heat exchanger system B section.

[0010] As a further improvement to the technical solution of this utility model, the fan assembly includes a variable frequency fan one and a variable frequency fan two; the variable frequency fan one is disposed on one side of the heat exchanger one; the variable frequency fan two is disposed on one side of the heat exchanger two and the heat exchanger three.

[0011] As a further improvement to the technical solution of this utility model, the pipelines between heat exchanger one and heat exchanger two are independent; heat exchanger one, heat exchanger two and heat exchanger three are all tube-fin heat exchangers.

[0012] As a further improvement to the technical solution of this utility model, the device is provided with temperature sensor one, temperature sensor two, temperature and humidity sensor one, and temperature and humidity sensor two; temperature sensor one is located on the air inlet side of system A on one side of the heat exchanger, temperature sensor two is located on the air inlet side of system B on one side of the heat exchanger, temperature and humidity sensor one is located on the system mixing air inlet side of the heat exchanger, and temperature and humidity sensor two is located on the mixing air outlet section of the air outlet side of the heat exchanger.

[0013] As a further improvement to the technical solution of this utility model, the fixed-frequency compression refrigeration and dehumidification system A has two modes: refrigeration operation and dehumidification operation. When the humidity requirement is lower than RH65%, it can be switched to the dehumidification operation mode to control the humidity.

[0014] As a further improvement to the technical solution of this utility model, the variable frequency compression heat pump system B has two modes: cooling operation and heating operation. The cooling operation mode is a variable load adjustment operation, which can be automatically turned on according to the load changes in the warehouse. The heating operation mode includes temperature adjustment when the temperature is lower than the set temperature, and temperature and humidity adjustment when the humidity is higher than the set humidity and within the allowable temperature range.

[0015] As a further improvement to the technical solution of this utility model, the control mode collects data from the temperature and humidity sensor, transmits it to the central controller, and outputs the corresponding operating mode after calculation.

[0016] As a further improvement to the technical solution of this utility model, the heat exchanger system A and the heat exchanger system B are arranged vertically, with the lower part being a condenser that dissipates heat outward and provides a heat source for defrosting the bottom of the heat pump heat exchanger.

[0017] This utility model has the following beneficial effects:

[0018] Overcoming the frosting problem and improving operating efficiency: The outdoor unit heat exchanger in the dual system adopts a unique top-to-bottom arrangement design. The lower system acts as a condenser, continuously dissipating heat to the outside during operation, providing a stable defrosting heat source for the bottom of the heat pump heat exchanger. This fundamentally solves the problem of easy frosting and difficult defrosting at the bottom, significantly improving the overall operating efficiency of the unit, reducing equipment maintenance costs, and extending the service life of the equipment.

[0019] Wide-range stable temperature and humidity control: The refrigeration and dehumidification system, with its efficient cooling and dehumidification capabilities, perfectly meets the temperature and humidity control requirements in the medium and high temperature range; the heat pump system demonstrates excellent temperature and humidity regulation performance in the medium and low temperature range. Working together, the two systems achieve stable and precise control of the temperature and humidity in the storage environment over a wide range. Furthermore, the two systems operate independently; if one system is shut down due to maintenance or malfunction, the other system continues to function normally, ensuring that the storage environment is unaffected and providing reliable protection for goods storage.

[0020] Significant energy-saving and cost advantages: The variable load adjustment characteristics of the variable frequency compressor enable it to operate flexibly according to the actual load changes in the warehouse, avoiding energy waste and achieving significant energy-saving effects; at the same time, the shared design of the fan effectively reduces the number of equipment parts, lowers the initial investment cost, and brings tangible economic benefits to warehousing companies. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of a dual-system variable frequency energy-saving temperature and humidity control device according to the present invention;

[0023] Figure 2 This is a logic flowchart illustrating the temperature control range in an embodiment of the present invention.

[0024] Figure 3 This is a logic flowchart illustrating the humidity control range of an embodiment of the present invention;

[0025] Figure 4 This is a logic flowchart of the outdoor ambient temperature anti-frost control in an embodiment of the present invention.

[0026] In the attached diagram: 1-Fixed frequency compressor; 2-Variable frequency compressor; 3-Liquid receiver one; 4-Liquid receiver two; 5-Four-way valve; 6-Heat exchanger one; 7-Electronic expansion valve one; 8-Electronic expansion valve two; 9-Solenoid valve two; 10-Solenoid valve one; 11-Thermal expansion valve; 12-Heat exchanger two; 13-Heat exchanger three; 14-Variable frequency fan two; 15-Variable frequency fan one. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, upper end, lower end, top, bottom, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] In this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this utility model.

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Please see Figure 1 This utility model provides a technical solution: a dual-system variable frequency energy-saving temperature and humidity control device, including a fixed frequency compression refrigeration and dehumidification system A and a variable frequency compression heat pump system B; both the fixed frequency compression refrigeration and dehumidification system A and the variable frequency compression heat pump system B are installed on the outdoor air-cooled unit side; it also includes a compressor assembly, a heat exchange assembly, a liquid storage assembly, a valve assembly, and a fan assembly; the fixed frequency compression refrigeration and dehumidification system A and the variable frequency compression heat pump system B form their respective circulation loops through the connection of the compressor assembly, heat exchange assembly, liquid storage assembly, and valve assembly.

[0033] Specifically, in this embodiment, the compressor assembly includes a fixed-frequency compressor 1 and a variable-frequency compressor 2; the heat exchange assembly includes heat exchanger 1 6, heat exchanger 2 12, and heat exchanger 3 13; the liquid storage assembly includes liquid storage tank 1 3 and liquid storage tank 2 4; the valve assembly includes a four-way valve 5, an electronic expansion valve 1 7, an electronic expansion valve 2 8, a thermostatic expansion valve 11, a solenoid valve 10, and a solenoid valve 2 9; the outlet of the fixed-frequency compressor 1 is connected to the inlet of system A of heat exchanger 1 6, the outlet of system A of heat exchanger 1 6 is connected to the inlet of liquid storage tank 1 3, the outlet of liquid storage tank 1 3 is connected to solenoid valve 10 and the inlet of heat exchanger 3 13 respectively, the outlet of heat exchanger 3 13 is connected to solenoid valve 2 9, the outlets of solenoid valve 10 and solenoid valve 2 9 are connected together to thermostatic expansion valve 11, the outlet of thermostatic expansion valve 11 is connected to the inlet of system A of heat exchanger 2 12, and the outlet of system A of heat exchanger 2 12 is connected to the inlet of fixed-frequency compressor 1.

[0034] Specifically, in this embodiment, the outlet of the variable frequency compressor 2 is connected to the inlet of the four-way valve 5. The outlets of the four-way valve 5 are respectively: outlet one is connected to the inlet of the heat exchanger 6 system B section, outlet two is connected to the inlet of the variable frequency compressor 2, outlet three is connected to the outlet of the heat exchanger 6 system B section, the outlet of the heat exchanger 6 system B section is connected to the inlet of the electronic expansion valve 7, the outlet of the electronic expansion valve 7 is connected to the inlet of the liquid receiver 4, the outlet of the liquid receiver 4 is connected to the inlet of the electronic expansion valve 8, and the outlet of the electronic expansion valve 8 is connected to the inlet of the heat exchanger 2 system B section.

[0035] It should be noted that the core of the equipment consists of a fixed-frequency compression refrigeration and dehumidification system A and a variable-frequency compression heat pump system B working together. It is equipped with a fixed-frequency compressor 1 and a variable-frequency compressor 2 as power sources; liquid receiver 1 3 and liquid receiver 2 4 ensure stable storage and supply of refrigerant; a four-way valve 5, electronic expansion valve 1 7, electronic expansion valve 2 8, solenoid valve 1 10, solenoid valve 2 9, and thermostatic expansion valve 11 precisely regulate the direction and flow of refrigerant; heat exchangers 1 6, 2 12, and 3 13 undertake the task of heat exchange; and variable-frequency fans 1 and 2 achieve efficient air circulation.

[0036] In the fixed-frequency compressor 1 system, the outlet of fixed-frequency compressor 1 is closely connected to the inlet end of the heat exchanger 6 system A section. The outlet of the heat exchanger 6 system A section is seamlessly connected to the inlet of the liquid receiver 3. The outlet of the liquid receiver 3 is divided into two paths, which are respectively connected to the inlet of solenoid valve 10 and heat exchanger 3 13. The outlet of heat exchanger 3 13 is connected to solenoid valve 2 9. The outlets of solenoid valve 10 and solenoid valve 2 9 are combined and connected to the thermal expansion valve 11. The outlet of thermal expansion valve 11 is connected to the inlet end of the heat exchanger 2 12 system A section. Finally, the outlet end of the heat exchanger 2 12 system A section is connected back to the inlet of fixed-frequency compressor 1, forming a complete and efficient fixed-frequency system loop.

[0037] Within the variable frequency compressor 2 system, the outlet of variable frequency compressor 2 is connected to the inlet of four-way valve 5. The outlet of four-way valve 5 is divided into three paths: outlet one connects to the inlet of heat exchanger 6 system section B, outlet two connects to the inlet of variable frequency compressor 2, and outlet three connects to the outlet of heat exchanger 2 12 system section B. The outlet of heat exchanger 6 system section B is sequentially connected to electronic expansion valve 7, liquid receiver 4, and electronic expansion valve 8, ultimately connecting to the inlet of heat exchanger 2 12 system section B, thus establishing the circulation path of the variable frequency system. The piping of heat exchanger 6 and heat exchanger 2 12 in the two systems is independent, ensuring that the refrigerant circulates independently in different systems without interference. However, variable frequency fan 1 (fan on one side of the heat exchanger) and variable frequency fan 2 (fan on the other side of the heat exchanger) are shared, effectively integrating resources and improving equipment operating efficiency.

[0038] Specifically, in this embodiment, the fan assembly includes a variable frequency fan 15 and a variable frequency fan 14; the variable frequency fan 15 is disposed on one side of the heat exchanger 6; the variable frequency fan 14 is disposed on one side of the heat exchanger 12 and the heat exchanger 13. It should be noted that the variable frequency fans 15 and 14 adjust their frequencies in real time according to the instructions of the central controller and specific control conditions, thereby achieving precise adjustment of the airflow and further optimizing the heat exchange effect and temperature and humidity control performance of the equipment.

[0039] Specifically, in this embodiment, the piping between heat exchanger 6 and heat exchanger 12 is independent; heat exchanger 6, heat exchanger 12 and heat exchanger 13 are all tube-fin heat exchangers.

[0040] Specifically, in this embodiment, the device is equipped with temperature sensor one, temperature sensor two, temperature and humidity sensor one, and temperature and humidity sensor two. Temperature sensor one is located on the A system air inlet side of the heat exchanger, temperature sensor two is located on the B system air inlet side of the heat exchanger one (6), temperature and humidity sensor one is located on the system mixing air inlet side of the heat exchanger two (12), and temperature and humidity sensor two is located on the mixed air outlet section of the heat exchanger two (outlet side). It should be noted that this device is equipped with an advanced intelligent control system, using temperature sensors one, two, and temperature and humidity sensors one and two to accurately collect key data during device operation. Temperature sensor one precisely corresponds to the A system air inlet side of the heat exchanger one (6), temperature sensor two precisely corresponds to the B system air inlet side of the heat exchanger one (6), temperature and humidity sensor one accurately corresponds to the system mixing air inlet side of the heat exchanger two (6), and temperature and humidity sensor two precisely corresponds to the mixed air outlet section of the heat exchanger two (outlet side). The data collected in real time by these sensors is quickly transmitted to the central controller. The central controller uses advanced algorithms to perform in-depth calculations and accurately outputs the corresponding operating mode based on the calculation results, thereby realizing the intelligent and automated operation of the equipment.

[0041] Specifically, in this embodiment, the fixed-frequency compression refrigeration and dehumidification system A has two modes: refrigeration and dehumidification. When the required humidity is below RH65%, it can switch to dehumidification mode to control the humidity. It should be noted that during refrigeration operation, while achieving cooling, it also has a certain dehumidification function, capable of meeting the storage needs under normal humidity conditions. When the storage environment has more stringent humidity requirements, such as needing to control the humidity below RH65%, it can flexibly switch to dehumidification mode. Through fine-tuning within the system, it ensures that the humidity in the warehouse remains stable within the required range, comprehensively guaranteeing the humidity conditions for goods storage.

[0042] Specifically, in this embodiment, the variable frequency compressor heat pump system B has two modes: cooling operation and heating operation. The cooling operation mode is a variable load adjustment operation, which can automatically start according to the load changes in the warehouse. The heating operation mode includes temperature adjustment when the temperature is lower than the set temperature, and temperature and humidity adjustment when the humidity is higher than the set humidity but within the allowable temperature range. It should be noted that in the cooling operation mode, the variable frequency compressor 2, with its variable load adjustment characteristics, can automatically adjust its operating parameters in real time according to the load changes in the warehouse, achieving precise temperature and humidity control, meeting the temperature and humidity requirements of the storage environment while minimizing energy consumption. The heating operation mode has a dual function: when seasonal changes or load changes cause the temperature in the warehouse to fall below the set temperature, the system quickly starts the heating function to rapidly raise the temperature in the warehouse, ensuring that the goods are stored in a suitable temperature environment; when the humidity is higher than the set humidity, the system can cleverly operate temperature and humidity adjustment within the allowable temperature range, comprehensively meeting the complex and ever-changing temperature and humidity control needs of the storage environment by precisely controlling the dynamic balance of temperature and humidity.

[0043] Specifically, in this embodiment, the control mode is based on data acquisition from the temperature and humidity sensor, which is transmitted to the central controller and then processed to output the corresponding operating mode. During the operation of the variable frequency compressor 2 system, the compressor frequency is flexibly adjusted, and the corresponding electronic expansion valve automatically and quickly adjusts the throttling opening based on the precise calculation results of the central controller, ensuring a perfect match between the refrigerant flow rate and the compressor's operating state, and maintaining the system's efficient and stable operation.

[0044] Specifically, in this embodiment, the heat exchanger system A and the heat exchanger system B are arranged vertically, with the lower part being a condenser that dissipates heat outward and provides a heat source for defrosting the bottom of the heat pump heat exchanger.

[0045] It should be noted that:

[0046] Temperature control:

[0047] Reference Figure 2 The controller of this equipment is pre-set with precise temperature parameter ranges to meet the stringent temperature requirements of the storage environment. During actual operation, if both temperature and humidity exceed the preset ranges, the system will prioritize temperature control. This is because temperature stability often plays a crucial role in the preservation quality of goods in a storage environment.

[0048] The system collects and accurately compares real-time data from temperature and humidity sensors installed on the inlet and outlet sides of the heat exchanger. When the detected temperature exceeds the set value, the fixed-frequency system A quickly activates the cooling mode. At this time, the fans on both sides of the heat exchanger operate at a low frequency, which ensures adequate airflow to meet initial cooling needs while reducing energy consumption and improving energy efficiency to some extent.

[0049] If the temperature fails to reach the set range within the preset time, the system will automatically activate the fixed-frequency system A and the variable-frequency system B to work together. At this time, both systems operate in cooling mode, and the fans on both sides of the heat exchanger (variable-frequency fan 2 14) switch to high-frequency operation to accelerate airflow and enhance heat exchange. Simultaneously, the variable-frequency compressor 2 operates at low frequency, finely adjusting the cooling capacity output based on the actual temperature deviation to ensure that cooling requirements are met while avoiding excessive cooling and energy waste.

[0050] As the temperature gradually approaches the set range, the system will sequentially and orderly stop the operation of relevant equipment according to the pre-set control program, thereby achieving precise temperature control and maintaining a stable temperature in the storage environment.

[0051] When the detected temperature value is lower than the set range, the inverter system B immediately starts operating in heating mode. By precisely controlling the operating parameters of the heat pump system, the system efficiently transfers heat to the storage space, causing the temperature to quickly rise back to the set range. Once the set value is reached, the system will gradually stop heating operation according to the control program, ensuring the temperature stabilizes within a suitable range.

[0052] Humidity control:

[0053] Reference Figure 3 The controller also has a strictly preset humidity parameter range to ensure that the humidity of the storage environment meets the requirements for goods storage. When the detected humidity value is higher than the set value, the fixed-frequency system A will start the dehumidification mode first. At this time, the fans on both sides of the heat exchanger (variable frequency fan 2 14) operate at a low frequency to ensure that the air can pass through the dehumidification system slowly and evenly during the dehumidification process, thereby improving the dehumidification effect.

[0054] If the humidity level does not reach the set range within a certain time, the system will activate the fixed-frequency system A and the variable-frequency system B to work together. Fixed-frequency system A will continue dehumidification, while variable-frequency system B will operate in cooling mode. This collaborative working mode further reduces the air temperature and increases the amount of water vapor condensation in the air, thereby improving dehumidification efficiency. Simultaneously, the fans on both sides of the heat exchanger (variable-frequency fan 2 14) will continue to operate at low frequency, ensuring that the system achieves efficient dehumidification while maintaining reasonable energy consumption. Variable-frequency compressor 2 will operate at low frequency according to the actual humidity deviation, precisely adjusting the cooling capacity to optimize the dehumidification effect.

[0055] When the humidity reaches the set range but the temperature is below the set value, the system will intelligently switch to the heating mode of inverter system B. At this time, the fans on both sides of the heat exchanger (inverter fan 2 14) switch to high-frequency operation to accelerate air circulation, allowing heat to be quickly and evenly distributed in the storage space, while increasing the heating rate. Inverter compressor 2 operates at high frequency, increasing the heating output, further reducing humidity while raising the temperature, ensuring that both humidity and temperature reach the set range. Once both temperature and humidity reach the set values, the system will sequentially stop the equipment operation according to the control program, achieving precise dual control of temperature and humidity.

[0056] Outdoor ambient temperature anti-frost control:

[0057] Reference Figure 4 The controller is pre-set with key temperature parameters to address the impact of outdoor temperature variations on equipment operation. When the outdoor temperature is below the limit, the system will prioritize the temperature and humidity control requirements inside the warehouse to ensure the storage environment is unaffected.

[0058] The system collects and compares data in real time using temperature sensors installed on the air inlet side of the heat exchanger, specifically in systems B and A. When a temperature value is detected to be not less than the set value, the system terminates the current monitoring process normally according to the control program.

[0059] If the temperature is lower than the set value, the inverter system B will immediately switch to cooling mode, and the fan on one side of the heat exchanger (inverter fan-15) will stop running. This reduces the entry of cold outdoor air and lowers the risk of frost formation due to excessively low equipment surface temperature.

[0060] If the temperature does not exceed the set value within the preset time, the system will activate the fixed-frequency system A and the variable-frequency system B to work together, with both systems operating in cooling mode. At this time, the fan on one side of the heat exchanger (variable-frequency fan-15) will operate at a low frequency to ensure adequate airflow while reducing the heat exchange rate on the equipment surface and preventing the temperature from becoming too low.

[0061] When the temperature exceeds the set value, the fixed-frequency system A will run continuously for 5 minutes. This design is to prevent the equipment from frequently starting and stopping due to temperature fluctuations, further consolidate the anti-frost effect, and ensure that the equipment operates stably under complex outdoor temperature conditions.

[0062] In summary, the present invention has the following advantages over the prior art:

[0063] Overcoming the frosting problem and improving operating efficiency: The outdoor unit heat exchanger in the dual system adopts a unique top-to-bottom arrangement design. The lower system acts as a condenser, continuously dissipating heat to the outside during operation, providing a stable defrosting heat source for the bottom of the heat pump heat exchanger. This fundamentally solves the problem of easy frosting and difficult defrosting at the bottom, significantly improving the overall operating efficiency of the unit, reducing equipment maintenance costs, and extending the service life of the equipment.

[0064] Wide-range stable temperature and humidity control: The refrigeration and dehumidification system, with its efficient cooling and dehumidification capabilities, perfectly meets the temperature and humidity control requirements in the medium and high temperature range; the heat pump system demonstrates excellent temperature and humidity regulation performance in the medium and low temperature range. Working together, the two systems achieve stable and precise control of the temperature and humidity in the storage environment over a wide range. Furthermore, the two systems operate independently; if one system is shut down due to maintenance or malfunction, the other system continues to function normally, ensuring that the storage environment is unaffected and providing reliable protection for goods storage.

[0065] Significant energy-saving and cost advantages: The variable load adjustment characteristics of the variable frequency compressor enable it to operate flexibly according to the actual load changes in the warehouse, avoiding energy waste and achieving significant energy-saving effects; at the same time, the shared design of the fan effectively reduces the number of equipment parts, lowers the initial investment cost, and brings tangible economic benefits to warehousing companies.

[0066] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A dual-system variable frequency energy-saving temperature and humidity control device, characterized in that: It includes a fixed-frequency compression refrigeration and dehumidification system A and a variable-frequency compression heat pump system B; both the fixed-frequency compression refrigeration and dehumidification system A and the variable-frequency compression heat pump system B are located on the outdoor air-cooled unit side; it also includes a compressor assembly, a heat exchange assembly, a liquid storage assembly, a valve assembly, and a fan assembly; the fixed-frequency compression refrigeration and dehumidification system A and the variable-frequency compression heat pump system B form their respective circulation loops through the connection of the compressor assembly, heat exchange assembly, liquid storage assembly, and valve assembly.

2. The dual-system variable frequency energy-saving temperature and humidity control equipment according to claim 1, characterized in that: The compressor assembly includes a fixed-frequency compressor and a variable-frequency compressor; the heat exchange assembly includes heat exchanger one, heat exchanger two, and heat exchanger three; the liquid storage assembly includes liquid storage tank one and liquid storage tank two; the valve assembly includes a four-way valve, electronic expansion valve one, electronic expansion valve two, thermostatic expansion valve, solenoid valve one, and solenoid valve two; the outlet of the fixed-frequency compressor is connected to the inlet of system A of heat exchanger one, the outlet of system A of heat exchanger one is connected to the inlet of liquid storage tank one, the outlet of liquid storage tank one is connected to solenoid valve one and the inlet of heat exchanger three respectively, the outlet of heat exchanger three is connected to solenoid valve two, the outlets of solenoid valve one and solenoid valve two are connected together to the thermostatic expansion valve, the outlet of the thermostatic expansion valve is connected to the inlet of system A of heat exchanger two, and the outlet of system A of heat exchanger two is connected to the inlet of the fixed-frequency compressor.

3. The dual-system variable frequency energy-saving temperature and humidity control equipment according to claim 2, characterized in that: The outlet of the variable frequency compressor is connected to the inlet of the four-way valve. The outlets of the four-way valve are respectively: outlet one is connected to the inlet of the system B section of heat exchanger one; outlet two is connected to the inlet of the variable frequency compressor; outlet three is connected to the outlet of the system B section of heat exchanger two; the outlet of the system B section of heat exchanger one is connected to the inlet of the electronic expansion valve one; the outlet of the electronic expansion valve one is connected to the inlet of the liquid receiver two; the outlet of the liquid receiver two is connected to the inlet of the electronic expansion valve two; and the outlet of the electronic expansion valve two is connected to the inlet of the system B section of heat exchanger two.

4. The dual-system variable frequency energy-saving temperature and humidity control equipment according to claim 2, characterized in that: The fan assembly includes a variable frequency fan one and a variable frequency fan two; the variable frequency fan one is located on one side of the heat exchanger one; the variable frequency fan two is located on one side of the heat exchanger two and the heat exchanger three.

5. The dual-system variable frequency energy-saving temperature and humidity control equipment according to claim 2, characterized in that: The piping between heat exchanger one and heat exchanger two is independent; heat exchanger one, heat exchanger two and heat exchanger three are all tube-fin heat exchangers.

6. The dual-system variable frequency energy-saving temperature and humidity control equipment according to claim 2, characterized in that: The device is equipped with temperature sensor one, temperature sensor two, temperature and humidity sensor one, and temperature and humidity sensor two. Temperature sensor one is located on the air inlet side of system A on one side of the heat exchanger, temperature sensor two is located on the air inlet side of system B on one side of the heat exchanger, temperature and humidity sensor one is located on the system mixing air inlet side of the heat exchanger, and temperature and humidity sensor two is located on the mixing air outlet section of the air outlet side of the heat exchanger.

7. The dual-system variable frequency energy-saving temperature and humidity control equipment according to claim 6, characterized in that: The fixed-frequency compression refrigeration and dehumidification system A has two modes: refrigeration operation and dehumidification operation. When the humidity requirement is lower than RH65%, it can be switched to dehumidification operation mode to control the humidity.

8. A dual-system variable frequency energy-saving temperature and humidity control device according to claim 6, characterized in that: The variable frequency compression heat pump system B has a cooling operation mode and a heating operation mode. The cooling operation mode is a variable load adjustment operation, which can be automatically activated according to the load changes in the warehouse. The heating operation mode includes temperature adjustment when the temperature is lower than the set temperature, and temperature and humidity adjustment when the humidity is higher than the set humidity and within the allowable temperature range.

9. A dual-system variable frequency energy-saving temperature and humidity control device according to claim 8, characterized in that: The control mode is based on the data collected by the temperature and humidity sensor, which is transmitted to the central controller and then processed to output the corresponding operating mode.

10. A dual-system variable frequency energy-saving temperature and humidity control device according to claim 2, characterized in that: The heat exchanger system A and the heat exchanger system B are arranged vertically, with the lower part being the condenser, which dissipates heat outward and provides a heat source for defrosting the bottom of the heat pump heat exchanger.

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