A heat pump type low temperature regenerative rotor fresh air variable frequency dehumidification system for radiant air conditioning

Abstract

The present invention relates to a heat pump type low-temperature regenerative rotary fresh air variable frequency dehumidification system for radiant air conditioning, the system comprising a rotary dehumidification unit, a direct expansion unit, and mutually separated fresh air ducts and regeneration ducts; the rotary dehumidification unit comprises: a dehumidification rotary wheel (12) for heating and dehumidifying air; the dehumidification rotary wheel (12) is simultaneously inserted in the fresh air duct and the regeneration duct; the direct expansion unit comprises: an air-cooled condenser (22) for heating the air in the regeneration duct; an evaporator (23) for recovering heat in the fresh air duct; a variable frequency compressor (21) for providing steam to the air-cooled condenser (22); the air-cooled condenser (22) is located in the regeneration duct, and the evaporator (23) is located in the fresh air duct. Compared with the prior art, the present invention has the advantages of energy saving, high efficiency, and stronger dehumidification capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary dehumidifiers, and in particular to a heat pump type low-temperature regeneration rotary fresh air variable frequency dehumidification system for radiant air conditioning. Background Art

[0002] Rotary dehumidifiers are an important branch of the air conditioning industry and a typical example of heating and dehumidification. Their main component is the rotor, which is coated with a desiccant and has honeycomb-shaped porous channels. Slowly rotating the rotor absorbs moisture from the humid air flowing through it. After absorbing moisture, the rotor is then blown through with a high-temperature dry airflow, dehydrating and regenerating the desiccant. However, the regeneration air heaters in current rotary dehumidifiers consume a large amount of energy to heat the regeneration air to vaporize the moisture absorbed by the desiccant rotor. This heat is then released into the atmosphere along with the regeneration air, resulting in a waste of resources. Therefore, current rotary dehumidifiers suffer from high regeneration energy consumption and resource waste.

[0003] As people's living standards have significantly improved, the demand for thermal comfort in air conditioning systems has also increased. Independently controlled temperature and humidity air conditioning systems, with their advantages of high thermal comfort and excellent energy efficiency, have seen rapid development in recent years. However, in high-temperature and high-humidity regions, problems such as condensation at the radiator terminals and poor cooling capacity are particularly severe, hindering the large-scale implementation of independent temperature and humidity control air conditioning systems. The root cause is the limited dehumidification capacity of chilled water fresh air units. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a heat pump type low-temperature regenerative rotor fresh air variable frequency dehumidification system for radiant air conditioning that is energy-saving, efficient and has stronger dehumidification capacity.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The inventors have proposed a low-energy heat pump-based, low-temperature regenerative rotary fresh air dehumidification system with improved dehumidification capacity. This system leverages the higher-performance dehumidification function of the silica gel rotary wheel, uses the heat pump's evaporator to cool and dehumidify the hot air, and simultaneously uses the heat released by the heat pump's condenser to heat the regenerated air, achieving deep air humidity treatment with low energy consumption. The specific solution is as follows:

[0007] A heat pump type low-temperature regenerative rotor fresh air variable frequency dehumidification system for radiant air conditioning, the system comprising a rotor dehumidification unit, a direct expansion unit, and separate fresh air ducts and regeneration ducts;

[0008] The rotary dehumidification unit comprises:

[0009] Dehumidification wheel, used for heating and dehumidifying air;

[0010] The dehumidification wheel is inserted into both the fresh air duct and the regeneration air duct;

[0011] The direct expansion unit comprises:

[0012] The air-cooled condenser is used to heat the air in the regeneration duct. Although it is named "air-cooled condenser" here, it actually condenses and liquefies the transported steam to release heat and heat the air.

[0013] The evaporator is used to recover heat in the fresh air duct. Although it is called "evaporator" here, it actually evaporates the transported liquid to absorb heat and cool the air.

[0014] Variable frequency compressor, used to provide steam to the air-cooled condenser;

[0015] The air-cooled condenser is located in the regeneration air duct, and the evaporator is located in the fresh air duct.

[0016] Furthermore, the rotary dehumidification unit further comprises:

[0017] Chilled water coil, used to cool the hot and humid air in the fresh air duct;

[0018] Water-cooled condenser provides cooling source for the cold water coil;

[0019] The cold water coil is located in the fresh air duct;

[0020] The cold water coil comprises a first cold water coil close to the fresh air duct inlet and a second cold water coil away from the fresh air duct inlet. The first cold water coil and the second cold water coil are respectively arranged on both sides of the dehumidification wheel;

[0021] The evaporator is located between the first cold water coil and the dehumidification wheel.

[0022] Furthermore, the cold water coil is connected to the water-cooled condenser, the outlet pipe and the inlet pipe of each cold water coil are connected by a branch pipe, and a three-way proportional regulating valve is provided at the connection node.

[0023] When the demand for a certain cold water coil is low or even not needed, the participation level of each cold water coil can be adjusted through a three-way valve.

[0024] Furthermore, a flow regulating component is provided between the air-cooled condenser and the variable frequency compressor, and the flow regulating component is connected in parallel with the evaporator.

[0025] When the air in the fresh air duct no longer needs to be further cooled, the evaporator does not need to participate, and its participation level can be controlled by the opening of the flow regulating component.

[0026] The flow regulating component may be a liquid injection expansion valve and / or a liquid injection solenoid valve.

[0027] Furthermore, the direct expansion unit further comprises a water-cooled condenser that provides a cold source for the system;

[0028] A bypass solenoid valve is provided between the air-cooled condenser and the variable frequency compressor, and the bypass solenoid valve is connected in parallel with the water-cooled condenser.

[0029] When the air-cooled condenser fails to release enough heat, the water-cooled condenser can be used to provide additional cooling, allowing the evaporator to meet refrigerant operating conditions. The degree of water-cooled condenser participation can be adjusted by adjusting the opening of the bypass solenoid valve.

[0030] Furthermore, a liquid reservoir and / or a filter and / or a gas separator is provided between the air-cooled condenser and the variable frequency compressor.

[0031] Furthermore, a refrigeration solenoid valve and / or a refrigeration expansion valve is provided on the evaporator inlet pipe.

[0032] Furthermore, the air inlet of the fresh air duct is provided with a primary filter, and the air outlet is provided with a medium filter;

[0033] The air outlet of the fresh air duct is provided with a fresh air fan, and the air outlet of the regeneration air duct is provided with a regeneration fan.

[0034] Furthermore, a temperature sensor for monitoring temperature is provided in the fresh air duct and / or the regeneration air duct.

[0035] The temperature sensor can be arranged between the first cold water coil and the evaporator, between the evaporator and the dehumidification wheel, and between the dehumidification wheel and the air-cooled condenser.

[0036] Furthermore, the system further includes an unloading circuit connected in parallel with the variable frequency compressor, and an unloading solenoid valve is provided on the circuit.

[0037] The unloading circuit can help start and stop the variable frequency compressor.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] (1) In the present invention, the direct expansion unit is used to first provide a heat source for the system to regenerate the rotor, and then provide an evaporation recovery mechanism to recover part of the heat in the hot and humid air to the direct expansion unit, thereby achieving energy saving.

[0040] (2) In the present invention, parallel branches are provided for the evaporator, condenser, water-cooling coil, etc., which makes it easy to control the degree of participation of these key components, making the operation of the entire process more scientific and reasonable;

[0041] (3) In the present invention, the rotary dehumidification system includes a water-cooled coil, an evaporator, a rotary wheel, and a multi-stage dehumidification section, and has a stronger dehumidification capacity;

[0042] (4) The present invention is based on the higher performance dehumidification function of the silica gel wheel, and uses the evaporator to cool and dehumidify the hot air. At the same time, the heat released by the condenser heats the regenerated air, and achieves deep treatment of air humidity with low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the dehumidification fresh air system in the embodiment;

[0044] As shown in the figure, the symbols are: first cold water coil 11, dehumidification wheel 12, second cold water coil 13, water-cooled condenser 14, variable frequency compressor 21, air-cooled condenser 22, evaporator 23, bypass solenoid valve 24, liquid reservoir 25, gas separator 26, unloading solenoid valve 27, primary filter 31, medium filter 32, fresh air fan 41, and regeneration fan 42. DETAILED DESCRIPTION

[0045] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0046] Example

[0047] A heat pump type low temperature regenerative rotor fresh air variable frequency dehumidification system for radiant air conditioning, such as Figure 1 The system includes a rotary dehumidification unit, a direct expansion unit, and a fresh air duct and a regeneration duct separated from each other;

[0048] The rotary dehumidification unit includes: a cold water coil for cooling the hot and humid air in the fresh air duct; a water-cooled condenser 14 for providing a cold source for the cold water coil; a dehumidification wheel 12 for heating and dehumidifying the air; the dehumidification wheel 12 is inserted in both the fresh air duct and the regeneration duct; the cold water coil is located in the fresh air duct;

[0049] The direct expansion unit includes: an air-cooled condenser 22 connected in sequence, used to heat the air in the regeneration air duct; an evaporator 23, used to recover heat in the fresh air duct; a variable frequency compressor 21, used to provide steam to the air-cooled condenser 22; the air-cooled condenser 22 is located in the regeneration air duct, and the evaporator 23 is located in the fresh air duct.

[0050] A liquid reservoir 25 and / or a filter and / or a gas separator 26 may be provided between the air-cooled condenser 22 and the variable frequency compressor 21. A refrigeration solenoid valve and / or a refrigeration expansion valve may be provided on the inlet pipe of the evaporator 23. The air inlet of the fresh air duct is provided with a primary filter 31, and the air outlet is provided with a medium-efficiency filter 32; the air outlet of the fresh air duct is provided with a fresh air fan 41, and the air outlet of the regeneration air duct is provided with a regeneration fan 42. Temperature sensors for monitoring the temperature are provided in the fresh air duct and / or the regeneration air duct. The temperature sensors may be provided between the first cold water coil 11 and the evaporator 23, between the evaporator 23 and the dehumidification wheel 12, and between the dehumidification wheel 12 and the air-cooled condenser 22. An unloading circuit is also included in parallel with the variable frequency compressor 21, and the circuit is provided with an unloading solenoid valve 27. The unloading circuit can facilitate the start-up and shutdown of the variable frequency compressor 21.

[0051] In this embodiment, the cold water coil includes a first cold water coil 11 close to the fresh air duct inlet and a second cold water coil 13 away from the fresh air duct inlet. The first cold water coil 11 and the second cold water coil 13 are respectively arranged on both sides of the dehumidification wheel 12; the evaporator 23 is located between the first cold water coil 11 and the dehumidification wheel 12.

[0052] In this embodiment, the chilled water coils are connected to the water-cooled condenser 14. The outlet and inlet pipes of each chilled water coil are connected by branch pipes, and a three-way proportional control valve is installed at the connection point. When the demand for a particular chilled water coil is low or even not required, the three-way valve can be used to adjust the participation of each chilled water coil.

[0053] In this embodiment, a flow control assembly is provided between the air-cooled condenser 22 and the variable-frequency compressor 21, and is connected in parallel with the evaporator 23. When the air in the fresh air duct no longer requires further cooling, the evaporator 23 is no longer required to cool the air, but its degree of participation can be controlled by the opening of the flow control assembly. The flow control assembly can be a liquid injection expansion valve and / or a liquid injection solenoid valve.

[0054] In this embodiment, the direct expansion unit also includes a water-cooled condenser 14, which provides a cooling source for the system. A bypass solenoid valve 24 is installed between the air-cooled condenser 22 and the variable-frequency compressor 21, connected in parallel with the water-cooled condenser 14. When the air-cooled condenser 22 fails to release sufficient heat, the water-cooled condenser 14 provides additional cooling, allowing the refrigerant in the evaporator 23 to meet acceptable operating conditions. The degree of contribution of the water-cooled condenser 14 can be adjusted by adjusting the opening of the bypass solenoid valve 24.

[0055] Under dehumidification conditions, the hot and humid air is pre-cooled by the first cold water coil 11, then cooled and dehumidified by the evaporator 23, and then enters the dehumidification wheel 12 for further heating and dehumidification. It then passes through the second cold water coil 13, cools to a suitable temperature, and is delivered to the room.

[0056] On the regeneration side of the wheel, outdoor fresh air or indoor exhaust air is introduced, heated by the air-cooled condenser 22 , passes through the dehumidification wheel 12 , and is then discharged by the regeneration fan 42 .

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above disclosed technical content to modify or modify the present invention into equivalent embodiments with equivalent variations. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A heat pump type low temperature regenerative rotor fresh air variable frequency dehumidification system for radiant air conditioning, characterized in that: The system includes a rotary dehumidification unit, a direct expansion unit, and separate fresh air ducts and regeneration ducts; The rotary dehumidification unit comprises: A dehumidification wheel (12) for heating and dehumidifying the air; The dehumidification wheel (12) is inserted into both the fresh air duct and the regeneration air duct; The direct expansion unit comprises: an air-cooled condenser (22) for heating the air in the regeneration air duct; an evaporator (23) for recovering heat in the fresh air duct; A variable frequency compressor (21) for providing steam to an air-cooled condenser (22); The air-cooled condenser (22) is located in the regeneration air duct, and the evaporator (23) is located in the fresh air duct; The rotary dehumidification unit further comprises: Chilled water coil, used to cool the hot and humid air in the fresh air duct; A water-cooled condenser (14) provides a cooling source for the cold water coil; The cold water coil is located in the fresh air duct; The cold water coil comprises a first cold water coil (11) close to the fresh air duct inlet and a second cold water coil (13) away from the fresh air duct inlet. The first cold water coil (11) and the second cold water coil (13) are respectively arranged on both sides of the dehumidification wheel (12); The evaporator (23) is located between the first cold water coil (11) and the dehumidification wheel (12); The cold water coil is connected to the water-cooled condenser (14), the outlet pipe and the inlet pipe of each cold water coil are connected by a branch pipe, and a three-way proportional regulating valve is provided at the connection node; The direct expansion unit further includes a water-cooled condenser (14) that provides a cold source for the system; A bypass solenoid valve (24) is provided between the air-cooled condenser (22) and the variable frequency compressor (21), and the bypass solenoid valve (24) is connected in parallel with the water-cooled condenser (14); A flow regulating assembly is provided between the air-cooled condenser (22) and the variable frequency compressor (21), and the flow regulating assembly is connected in parallel with the evaporator (23); The system further comprises an unloading circuit connected in parallel with the variable frequency compressor (21), and an unloading solenoid valve (27) is provided on the circuit.

2. A heat pump type low temperature regenerative rotor fresh air variable frequency dehumidification system for radiant air conditioning according to claim 1, characterized in that: A liquid storage device (25) and / or a filter and / or a gas separator (26) is further provided between the air-cooled condenser (22) and the variable frequency compressor (21).

3. A heat pump type low temperature regenerative rotor fresh air variable frequency dehumidification system for radiant air conditioning according to claim 1, characterized in that: The inlet pipe of the evaporator (23) is provided with a refrigeration solenoid valve and / or a refrigeration expansion valve.

4. A heat pump type low temperature regenerative rotor fresh air variable frequency dehumidification system for radiant air conditioning according to claim 1, characterized in that: The air inlet of the fresh air duct is provided with a primary filter (31), and the air outlet is provided with a medium filter (32); The air outlet of the fresh air duct is provided with a fresh air fan (41), and the air outlet of the regeneration air duct is provided with a regeneration fan (42).

5. A heat pump type low temperature regenerative rotor fresh air variable frequency dehumidification system for radiant air conditioning according to claim 1, characterized in that: A temperature sensor for monitoring temperature is provided in the fresh air duct and / or the regeneration air duct.

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