Special LED light source cavity and gas-liquid heat dissipation integrated system for plant factory

Abstract

The invention relates to the technical field of agricultural facilities, and discloses an LED light source cavity and gas-liquid heat dissipation integrated system special for a plant factory, which comprises a closed light source cavity, an LED array is arranged in the closed light source cavity, the cavity is provided with at least one air inlet and an air outlet, the inner wall of the cavity is attached to a heat conduction substrate, and the substrate is in thermal contact with the back face of the LED array; the air path heat dissipation module comprises an axial flow fan arranged at the air outlet and a flow guide fan cover, turbulent flow fins are arranged on the inner side of the fan cover, and air flow passes through gaps of the LED array and is disturbed by the turbulent flow fins so as to enhance heat exchange; the liquid path heat dissipation module comprises a micro-channel liquid cooling plate attached to the back face of the heat conduction substrate, a circulation pipeline connected with the liquid cooling plate, and a micro liquid pump driving liquid to circulate. By adopting a gas-liquid dual-mode active heat dissipation structure, only a fan can be started for energy-saving operation at low temperature or low load according to the real-time heat productivity of an LED and the environment temperature level, and liquid circulation heat dissipation or gas-liquid synergistic enhanced heat exchange can be started at high load, so that excellent heat dissipation and temperature control capabilities can be always kept under different working conditions.

Description

Technical Field

[0001] This invention relates to the field of agricultural facility technology, specifically to an integrated system for LED light source cavity and gas / liquid heat dissipation for plant factories. Background Technology

[0002] Plant factories rely on artificial lighting environments to achieve continuous year-round crop production. Their core lies in highly controllable and efficient lighting systems. LEDs, due to their customizable spectrum, low energy consumption, and long lifespan, have become the mainstream light source in plant factories. However, in high-power-density cultivation scenarios, such as multi-layered leafy vegetable cultivation or fruit and vegetable seedling raising, the power of a single light source can reach hundreds to thousands of watts. LED chips generate a significant amount of heat during operation. If this heat cannot be effectively dissipated, the LED junction temperature will rise, accelerating light decay, shortening lifespan, and causing spectral drift, thus affecting the efficiency and quality of plant photosynthesis. Furthermore, excessively high local temperatures in the cultivation environment can lead to root stress and rapid aging, as well as scorching or uneven ripening of leaves and fruits. Therefore, developing an efficient, reliable, and environmentally compatible heat dissipation system is one of the key technologies for ensuring the stable operation of artificial light plant factories.

[0003] Currently, LED heat dissipation in plant factories mainly adopts three types of solutions: First, a pure air-cooling solution, consisting of heat sinks and axial / centrifugal fans. Although simple in structure and low in cost, air has a low specific heat capacity and poor thermal conductivity, resulting in limited heat exchange capacity per unit volume. Furthermore, condensation or dust accumulation on the heat sinks is prone to occur in high-temperature and high-humidity environments, reducing heat exchange efficiency. Second, a pure liquid-cooling solution, utilizing microchannel liquid cooling plates and circulating pumps to drive liquid to remove heat. Liquid has a much higher specific heat capacity and heat transfer coefficient than air, but additional pumping power is still required in plant factory applications, leading to higher system complexity and maintenance costs. Waste heat is usually directly discharged without utilization. Third, a combination of air and liquid cooling, but not integrated. While combining the advantages of both media, the independent arrangement and control of the two systems prevents dynamic optimization based on heat source load. This results in a large space occupation, making it difficult to adapt to the compact shelving layout of plant factories, and also presents the problem of waste heat waste. None of the above solutions can simultaneously meet the requirements of efficient heat dissipation, precise temperature control, compact space, and energy recovery.

[0004] The unique application scenarios of plant factories place higher demands on LED heat dissipation systems: precise temperature control is required to ensure spectral stability (temperature fluctuations should ideally be ≤±2℃) and the uniformity of the surrounding ambient temperature; a compact structure is needed to accommodate shelf height limitations of 250~350 / 450mm; high energy efficiency is required to reduce the combined energy consumption of lighting and heat dissipation; environmental friendliness is essential, meaning high protection levels, safe and pollution-free coolants, and adaptability to humid and dusty environments; and energy recovery capabilities are also necessary to utilize LED waste heat for nutrient solution heating, greenhouse supplementary heating, etc., thereby reducing the overall energy consumption of the planting process. Existing heat dissipation technologies are significantly insufficient in meeting these multi-dimensional requirements. Therefore, there is an urgent need to develop a novel LED light source heat dissipation system that integrates gas-liquid synergistic active heat dissipation, intelligent dynamic temperature control, cascade utilization of waste heat, and a highly integrated structure to improve the energy efficiency and operational reliability of plant factories and effectively reduce operating costs.

[0005] To address this, we propose a dedicated LED light source cavity and gas / liquid heat dissipation integrated system for plant factories. Summary of the Invention

[0006] To achieve the above objectives, the present invention provides the following technical solution: an integrated system for LED light source cavity and gas / liquid heat dissipation specifically for plant factories, comprising:

[0007] A sealed light source cavity is provided with an LED array inside. The cavity has at least one air inlet and one air outlet. A heat-conducting substrate is attached to the inner wall of the cavity, and the substrate is in thermal contact with the back of the LED array.

[0008] The airflow cooling module includes an axial fan and a guide shroud located at the air outlet. The inner side of the shroud is provided with turbulence fins. The airflow passes through the heat sink on the back of the LED array and is disturbed by the turbulence fins to enhance heat exchange.

[0009] The liquid cooling module includes a microchannel liquid cooling plate mounted on the back of a thermally conductive substrate, a circulation pipeline connected to the liquid cooling plate, and a micro liquid pump that drives the liquid circulation.

[0010] The intelligent temperature control unit includes temperature sensors distributed at the center of the LED substrate, the outlet of the liquid cooling plate, and the air outlet of the cavity; a controller that switches the heat dissipation mode according to the temperature signal; and a frequency conversion drive module that adjusts the fan speed and the liquid pump flow rate.

[0011] The waste heat recovery module includes a heat exchanger and a plant factory auxiliary heating unit connected to its secondary side, which is used to transfer the heat absorbed by the liquid cooling plate to the nutrient solution for heating or the greenhouse for warming; the integrated heating airflow can be returned for indoor environment warming and regulation during low-temperature seasons.

[0012] The airflow-liquid flow coupling structure features a high thermal conductivity interface material that tightly bonds the airflow guide shroud and the liquid cooling plate. The air outlet and the heat exchanger inlet share a ventilation path, allowing the exhausted hot air to participate in the preheating of the secondary liquid.

[0013] Preferably, the controller of the intelligent temperature control unit is programmed to execute three working modes: in the first mode (LED junction temperature T < 60℃), only the fan is started; in the second mode (60℃ ≤ T < 75℃), the fan and the liquid pump operate in coordination; and in the third mode (T ≥ 75℃), the fan and the liquid pump operate at full load and issue an alarm signal.

[0014] Preferably, the microchannel liquid cooling plate has a flow channel cross-sectional size of 0.3-1mm × 1-3mm, a flow channel spacing of 1-3mm, and is made of copper or aluminum alloy. The flow channel surface is polished or microtextured to reduce flow resistance and enhance heat exchange.

[0015] Preferably, the auxiliary heat-using unit of the waste heat recovery module includes a nutrient solution heating coil and a greenhouse heating duct, and the secondary side liquid of the heat exchanger is distributed to different heat-using ends as needed through a three-way valve.

[0016] Preferably, the turbulence fins of the air guide shroud have a height of 2-5 mm, a fin spacing of 5-15 mm, are arranged radially or in parallel, and are made of PVC, aluminum alloy, or stainless steel.

[0017] Preferably, the protection level of the sealed light source cavity is not lower than IP65, and the inner wall is covered with a high reflectivity material with a reflectivity greater than 90%.

[0018] Preferably, the circulating medium of the liquid cooling module is a food-grade coolant, including deionized water with an antibacterial agent or an aqueous solution of ethylene glycol.

[0019] Preferably, the temperature sensor sampling frequency of the intelligent temperature control unit is not less than 1Hz, and the controller uses a PID algorithm for closed-loop temperature control. The fan of the air cooling module and the liquid pump of the liquid cooling module are controlled by the same variable frequency drive module to achieve synchronous adjustment of fan speed and liquid pump flow rate, so as to optimize energy efficiency.

[0020] Compared with the prior art, the present invention provides a dedicated LED light source cavity and gas / liquid heat dissipation integrated system for plant factories, which has the following beneficial effects:

[0021] 1. This plant factory-specific LED light source cavity and gas-liquid cooling integrated system utilizes a gas-liquid dual-mode active cooling architecture. Based on the real-time heat generation of the LEDs, it can activate only the fan for energy-saving operation under low load, while enhancing heat exchange through gas-liquid synergy under high load, thus maintaining excellent heat dissipation capabilities under various operating conditions. Actual measurements show that this system can stably control the junction temperature of high-power LEDs at 55–62℃, a decrease of 15–20℃ compared to traditional pure air-cooling solutions, effectively suppressing light decay and spectral drift. Based on the Arrhenius lifetime model, the LED lifespan can be extended by 2–3 times, ensuring the stability and light quality consistency of long-term continuous production in the plant factory.

[0022] 2. This plant factory-specific LED light source cavity integrated with air-liquid cooling system incorporates a waste heat recovery module in the liquid cooling circuit. The heat absorbed by the liquid cooling plate is transferred via a heat exchanger to the nutrient solution heating or greenhouse warming stages of the plant factory, meeting 30%–50% of the auxiliary heating needs and reducing the energy consumption of additional heating equipment. Simultaneously, the hot air (approximately 40°C) exhausted from the air path enters the heat exchanger to participate in the secondary liquid preheating, further reducing the heating burden on the liquid pump and achieving cascaded utilization of heat. The system's overall energy efficiency ratio (light output + heat recovery) can reach 1.8–2.0, more than 50% higher than traditional air-cooled or liquid-cooled solutions, significantly reducing overall planting energy consumption.

[0023] 3. This plant factory-specific LED light source cavity and integrated gas / liquid cooling system, through the integrated design of the light source cavity, liquid cooling plate, and air duct, compresses the overall thickness to ≤80mm, adapting to the shelf height of 250~350 / 450mm in plant factories, saving space and optimizing shelf layout. The intelligent temperature control unit adopts multi-location, multi-point temperature acquisition and PID closed-loop control, with fast response speed (millisecond level) and temperature fluctuation ≤±2℃, avoiding performance degradation of LEDs due to sudden temperature changes. The sealed cavity has an IP65 protection rating, and the high-reflectivity material on the inner wall improves light utilization. The coolant uses a food-grade safe medium to ensure a pollution-free planting environment. The turbulence fins and microchannel design enhance heat exchange and reduce the impact of dust accumulation, enabling the system to operate stably for a long time in humid and dusty environments. It is easy to maintain, economical, and the investment payback period can be shortened to 2-3 years. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example

[0026] An embodiment of an integrated system for LED light source cavity and gas / liquid heat dissipation for plant factories

[0027] A dedicated LED light source cavity and gas / liquid heat dissipation integrated system for plant factories includes:

[0028] A sealed light source cavity is provided with an LED array inside. The cavity has at least one air inlet and one air outlet. A heat-conducting substrate is attached to the inner wall of the cavity, and the substrate is in thermal contact with the back of the LED array.

[0029] The airflow cooling module includes an axial fan and a guide shroud located at the air outlet. The inner side of the shroud is provided with turbulence fins. The airflow passes through the gap of the heat sink plate on the back of the LED array and is disturbed by the turbulence fins to enhance heat exchange.

[0030] The liquid cooling module includes a microchannel liquid cooling plate mounted on the back of a thermally conductive substrate, a circulation pipeline connected to the liquid cooling plate, and a micro liquid pump that drives the liquid circulation.

[0031] The intelligent temperature control unit includes temperature sensors distributed at the center of the LED substrate, the outlet of the liquid cooling plate, and the air outlet of the cavity; a controller that switches the heat dissipation mode according to the temperature signal; and a frequency conversion drive module that adjusts the fan speed and the liquid pump flow rate.

[0032] The waste heat recovery module includes a heat exchanger and a plant factory auxiliary heating unit connected to its secondary side, which is used to transfer the heat absorbed by the liquid cooling plate to the nutrient solution for heating or greenhouse heating; the heated airflow is integrated and returned for indoor environment temperature regulation during low-temperature seasons;

[0033] The airflow-liquid flow coupling structure features a high thermal conductivity interface material that tightly bonds the airflow guide shroud and the liquid cooling plate. The air outlet and the heat exchanger inlet share a ventilation path, allowing the exhausted hot air to participate in the preheating of the secondary liquid.

[0034] Specifically, the controller of the intelligent temperature control unit is programmed to execute three operating modes: the first mode (LED junction temperature T < 60℃) only starts the fan; the second mode (60℃ ≤ T < 75℃) the fan and liquid pump operate in coordination; and the third mode (T ≥ 75℃) the fan and liquid pump operate at full load and issue an alarm signal.

[0035] Specifically, the flow channel cross-sectional dimensions of the microchannel liquid cooling plate are 0.3-1mm × 1-3mm, the channel spacing is 1-3mm, the material is copper or aluminum alloy, and the flow channel surface is polished or micro-textured to reduce flow resistance and enhance heat transfer.

[0036] Specifically, the auxiliary heat-using unit of the waste heat recovery module includes a nutrient solution heating coil and a greenhouse heating duct. The secondary side liquid of the heat exchanger is distributed to different heat-using ends as needed through a three-way valve.

[0037] Specifically, the turbulence fins of the air guide shroud are 2-5mm high, the fin spacing is 5-15mm, and they are arranged radially or in parallel. The material is PVC, aluminum alloy or stainless steel.

[0038] Specifically, the protection level of the sealed light source cavity is no less than IP65, and the inner wall is lined with a high reflectivity material with a reflectivity greater than 90%.

[0039] Specifically, the circulating medium of the liquid cooling module is food-grade coolant, including deionized water with antibacterial agents or ethylene glycol aqueous solution.

[0040] Specifically, the temperature sensor of the intelligent temperature control unit has a sampling frequency of no less than 1Hz, and the controller uses a PID algorithm for closed-loop temperature control. The fan of the air cooling module and the liquid pump of the liquid cooling module are controlled by the same variable frequency drive module to achieve synchronous adjustment of fan speed and liquid pump flow rate, so as to optimize energy efficiency.

[0041] Through the above technical solution, this invention employs a gas-liquid dual-mode active heat dissipation architecture. Under low load, only the fan operates for energy saving, while under high load, gas and liquid synergistically enhance heat exchange, thus maintaining excellent heat dissipation capacity under different operating conditions. Actual measurements show that this system can stably control the LED junction temperature at 55–62℃, a decrease of 15–20℃ compared to traditional pure air-cooling solutions, effectively suppressing light decay and spectral drift. Based on the Arrhenius lifetime model, the LED lifespan can be extended by 2–3 times, ensuring the stability and light quality consistency of long-term continuous production in the plant factory. By introducing a waste heat recovery module into the liquid cooling circuit, the heat absorbed by the liquid cooling plate is transferred through a heat exchanger to the nutrient solution heating or greenhouse warming stages of the plant factory, meeting 30%–50% of the auxiliary heating needs and reducing the energy consumption of additional heating equipment. Simultaneously, the hot air (approximately 40℃) discharged from the gas path enters the heat exchanger to participate in the secondary liquid preheating, further reducing the heating burden on the liquid pump and achieving cascade utilization of heat. The system's overall energy efficiency ratio (light output + heat recovery) reaches 1.8–2.0, more than 50% higher than traditional air-cooled or liquid-cooled solutions, significantly reducing overall energy consumption in planting. Through the integrated design of the light source cavity, liquid cooling plate, and air duct, the overall thickness is reduced to ≤80mm, adaptable to the 250–350mm shelf height in plant factories, saving space and optimizing shelf layout. The intelligent temperature control unit employs multi-location, multi-point temperature acquisition and PID closed-loop control, with a fast response speed (millisecond level) and temperature fluctuations ≤±2℃, preventing LED performance degradation due to sudden temperature changes. The sealed cavity has an IP65 protection rating, and the high-reflectivity material on the inner wall improves light utilization. The coolant uses a food-grade safe medium to ensure a pollution-free planting environment. The turbulence fins and microchannel design enhance heat exchange and reduce dust accumulation, enabling the system to operate stably for a long time in humid and dusty environments. Maintenance is convenient and economical, with a payback period shortened to 2–3 years.

[0042] 1. System Overall Parameters

[0043] Application scenario: Seedling racks in plant factories (300mm high per rack)

[0044] Light source cavity dimensions: 1200mm (length) × 200mm (width) × 70mm (thickness)

[0045] LED configuration: 60 COB LEDs, 15W each, 660nm red light + 450nm blue light, total power 900W.

[0046] Target temperature control: LED junction temperature ≤ 65℃, cavity temperature ≤ 45℃

[0047] 2. Sealed light source cavity

[0048] Material: 6063-T5 aluminum alloy profile, CNC machined and welded.

[0049] Inner wall treatment: Adhere 99% reflectivity aluminum foil to improve light utilization to over 92%.

[0050] Air inlets: One Φ80mm removable stainless steel filter (100μm pore size) on each of the top two sides.

[0051] Air outlet: Φ100mm at the bottom center, equipped with a guide cone to reduce turbulence.

[0052] Thermally conductive substrate: 5mm thick oxygen-free copper plate (thermal conductivity 401W / m·K), surface mirror polished to reduce contact thermal resistance.

[0053] 3. Airflow cooling module

[0054] Fan: Axial flow fan AFB0612HH, maximum air volume 120 CFM (approximately 3.4 m³ / h). 3 ( / min), speed adjustable from 0 to 3000 rpm, PWM control.

[0055] Airflow guide shroud: made of curved PVC material with a radius of curvature R = 150mm. It has 12 evenly distributed baffle fins (3mm high, 10mm spacing) on ​​the inner side, arranged radially to guide airflow to evenly cover the gaps between the LED array (LED spacing 5mm).

[0056] Airflow path: Air inlet → Cavity → LED gap → Turbine fins → Air outlet → Common air duct → Heat exchanger air inlet

[0057] 4. Liquid cooling module

[0058] Liquid cooling plate: Copper microchannel plate, channel cross-section 0.5mm × 2mm, spacing 2mm, total length 1200mm, channel cross-sectional area 1200mm². 2 Laser welded to the back of the thermally conductive substrate

[0059] Coolant: 50% ethylene glycol aqueous solution (freezing point -35℃, boiling point 106℃, food grade certified)

[0060] Circulation pump: Miniature magnetically driven centrifugal pump, flow rate adjustable from 0 to 500 mL / min, power 8W

[0061] Heat exchanger: Plate stainless steel heat exchanger, with the primary side (liquid-cooled plate circuit) and secondary side (nutrient solution circuit) arranged in counter-current flow, heat exchange area 0.5m². 2 Pressure drop ≤ 5 kPa

[0062] 5. Intelligent temperature control unit

[0063] Sensors: NTC thermistors (B value 3950K), positioned at the center of the LED substrate, the liquid cooling plate outlet, and the cavity air outlet, with an accuracy of ±0.5℃ and a sampling frequency of 10Hz.

[0064] Controller: STM32F407 microcontroller, running PID algorithm, outputting PWM signal to fan and liquid pump mode settings:

[0065] Mode 1 (T<60℃): Fan 1500rpm, liquid pump off.

[0066] Mode 2 (60℃≤T<75℃): Fan 2500rpm, liquid pump 200mL / min

[0067] Mode 3 (T≥75℃): Fan 3000rpm, liquid pump 500mL / min, alarm output.

[0068] 6. Waste heat recovery module

[0069] Secondary side circuit: Nutrient solution heating coil (Φ10mm stainless steel pipe, total length 30m, wound around the bottom of the planting trough), greenhouse heating air duct (aluminum flat pipe, equipped with axial flow fan).

[0070] Flow control: The three-way solenoid valve automatically distributes the flow rate according to the nutrient solution temperature and greenhouse requirements.

[0071] Heat recovery benefits: The nutrient solution preheating rate is 1.2℃ / min, and it takes about 8 minutes to raise the temperature of 50L of nutrient solution from 18℃ to 28℃; winter greenhouse heating can reduce electric heater energy consumption by about 40%.

[0072] 7. Airflow-fluid flow coupling structure

[0073] Shared air duct: 200mm×100mm cross-section, smooth inner wall to reduce air resistance, and equipped with baffles to prevent airflow short-circuiting.

[0074] Hot air is first preheated in a heat exchanger to heat the secondary liquid before being discharged into the greenhouse or outdoors, reducing direct discharge of waste heat.

[0075] A high thermal conductivity silicone grease (thermal conductivity 6 W / m·K, thickness 0.1 mm) is applied between the liquid cooling plate and the thermally conductive substrate.

[0076] 8. Test Data and Verification

[0077] Ambient temperature 25℃, LED at full load for 2 hours:

[0078] The average junction temperature was 59.3℃, with a fluctuation of ±1.8℃.

[0079] The fan consumes 18W, the liquid pump consumes 12W, totaling 30W (traditional air cooling is 50W, liquid cooling is 60W).

[0080] The nutrient solution was preheated to the set temperature in 8.3 minutes, meeting the requirements for seedling cultivation.

[0081] The overall energy efficiency ratio (including light output and heat recovery) is 1.92.

[0082] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dedicated LED light source cavity and gas / liquid heat dissipation integrated system for plant factories, characterized in that: include: A sealed light source cavity is provided with an LED array inside. The cavity has at least one air inlet and one air outlet. A heat-conducting substrate is attached to the inner wall of the cavity, and the substrate is in thermal contact with the back of the LED array. The airflow cooling module includes an axial fan and a guide shroud located at the air outlet. The inner side of the shroud is provided with turbulence fins. The airflow passes through the gaps in the LED array and is disturbed by the turbulence fins to enhance heat exchange. The liquid cooling module includes a microchannel liquid cooling plate mounted on the back of a thermally conductive substrate, a circulation pipeline connected to the liquid cooling plate, and a micro liquid pump that drives the liquid circulation. The intelligent temperature control unit includes temperature sensors distributed at the center of the LED substrate, the outlet of the liquid cooling plate, and the air outlet of the cavity; a controller that switches the heat dissipation mode according to the temperature signal; and a frequency conversion drive module that adjusts the fan speed and the liquid pump flow rate. Waste heat recovery module, including heat exchanger and its secondary side connected auxiliary heating unit for plant factories, is used to transfer the heat absorbed by liquid cooling plate to nutrient solution heating or greenhouse temperature increase. The airflow-liquid flow coupling structure features a high thermal conductivity interface material that tightly bonds the airflow guide shroud and the liquid cooling plate. The air outlet and the heat exchanger inlet share a ventilation path, allowing the exhausted hot air to participate in the preheating of the secondary liquid.

2. The integrated system for LED light source cavity and gas / liquid heat dissipation for plant factories according to claim 1, characterized in that: The controller of the intelligent temperature control unit is programmed to execute three working modes: in the first mode (LED junction temperature T < 60℃), only the fan is started; in the second mode (60℃ ≤ T < 75℃), the fan and the liquid pump operate in coordination; and in the third mode (T ≥ 75℃), the fan and the liquid pump operate at full load and issue an alarm signal.

3. The integrated system for LED light source cavity and gas / liquid heat dissipation for plant factories according to claim 1, characterized in that: The microchannel liquid cooling plate has a flow channel cross-sectional size of 0.3~1mm×1~3mm, a flow channel spacing of 1~3mm, and is made of copper or aluminum alloy. The flow channel surface is polished or microtextured to reduce flow resistance and enhance heat exchange.

4. The integrated system for LED light source cavity and gas / liquid heat dissipation for plant factories according to claim 1, characterized in that: The auxiliary heat-using unit of the waste heat recovery module includes a nutrient solution heating coil and a greenhouse heating duct. The secondary side liquid of the heat exchanger is distributed to different heat-using ends as needed through a three-way valve.

5. The integrated system for LED light source cavity and gas / liquid heat dissipation for plant factories according to claim 1, characterized in that: The turbulence fins of the air guide shroud have a height of 2-5mm and a fin spacing of 5-15mm, arranged radially or in parallel, and are made of PVC, aluminum alloy or stainless steel.

6. The integrated system for LED light source cavity and gas / liquid heat dissipation for plant factories according to claim 1, characterized in that: The sealed light source cavity has a protection level of not less than IP65, and its inner wall is lined with a high reflectivity material with a reflectivity greater than 90%.

7. The integrated system for LED light source cavity and gas / liquid heat dissipation for plant factories according to claim 1, characterized in that: The circulating medium of the liquid cooling module is a food-grade coolant, which includes deionized water with antibacterial agent or an aqueous solution of ethylene glycol.

8. The integrated system for LED light source cavity and gas / liquid heat dissipation for plant factories according to claim 1, characterized in that: The temperature sensor of the intelligent temperature control unit has a sampling frequency of no less than 1Hz, and the controller uses a PID algorithm for closed-loop temperature control. The fan of the air cooling module and the liquid pump of the liquid cooling module are controlled by the same variable frequency drive module to achieve synchronous adjustment of fan speed and liquid pump flow rate to optimize energy efficiency.