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Explore our high-efficiency agricultural unit coolers and condensing sets configured specifically to minimize kWh/ton power consumption while maintaining strict relative humidity.
Designed for agricultural cold storage rooms, reducing moisture loss in fruits while operating with low-wattage EC motors.
Engineered for rapid field-heat pulldown. Incorporates optimized fin spacing to suppress frost accumulation and save defrost kWh.
High sensible heat ratio (SHR) cooler prevents produce dehydration during extended storage intervals in controlled atmosphere chambers.
Matched scroll compression unit engineered for agricultural cold storage, delivering low lift power consumption during night pulldown.
A comprehensive engineering analysis of agricultural heat loads, fan affinity laws, and system-level power conservation across modern packhouses.
In agricultural post-harvest cooling, fresh produce arrives from fields at temperatures between 25°C and 40°C. Removing sensible heat within the critical 4 to 12-hour window is vital to slow metabolic decay. However, this phase represents up to 70% of peak annual power draw for agricultural cold rooms, requiring air coolers that can deliver massive CFM without excessive kilowatt-hour waste.
Unlike inert frozen goods, harvested fruits and vegetables respire continuously, converting glucose and oxygen into CO2, water vapor, and vital heat ($Q_{resp}$). High-respiration produce such as broccoli, berries, and asparagus require unit air coolers with high Sensible Heat Ratios (SHR > 0.90) to prevent premature frosting, dry-out, and continuous compressor cycle spikes.
Evaporator fans run 24/7 in produce holding rooms to prevent thermal stratification. According to fan affinity laws, fan power varies with the cube of speed ($P \propto RPM^3$). Utilizing electronically commutated (EC) fans with multi-stage VFD modulation delivers a 50% airflow reduction during holding phases while slashing auxiliary power consumption by over 80%.
Globally, post-harvest fruit and vegetable handling accounts for approximately 8% of all electricity consumed across the commercial agri-food supply chain. With electricity tariffs continuing to surge in major horticultural export regions (such as North America, the Mediterranean basin, Southeast Asia, and Latin America), packing facilities and grower-shippers face severe operating margin compression.
The energy consumption of an air cooler in post-harvest refrigeration is fundamentally divided into three distinct operational domains: evaporator fan motor wattage, electric or hot gas defrost energy inputs, and the thermal lift imposed upon the connected condensing unit due to the evaporator's temperature difference ($\Delta T$). Selecting an air cooler with undersized coil surface area forces lower evaporating temperatures ($SST$), causing the condensing unit's Coefficient of Performance (COP) to degrade by roughly 2.5% to 3.5% per degree Celsius drop in evaporation temperature.
| Cooling Phase / Application | Target Produce Temp (°C) | Relative Humidity (RH %) | Air Velocity at Produce Bed | Typical Power Intensity (kWh / Ton) | Recommended Evaporator Type |
|---|---|---|---|---|---|
| Forced-Air Tunnel Pre-Cooling | 0.5°C to 4.0°C | 90% – 95% | 1.5 – 3.0 m/s | 18.5 – 32.0 kWh/t | High Static Pressure, Wide Fin Spacing (8-10mm) |
| Hydrocooling Auxiliary Room | 1.0°C to 3.0°C | 95% – 98% | 0.2 – 0.5 m/s | 12.0 – 20.0 kWh/t | Corrosion-Resistant Evaporative Chiller Coil |
| Controlled Atmosphere (CA) Apple/Pear | -0.5°C to 1.5°C | 92% – 95% | 0.1 – 0.25 m/s | 6.5 – 11.0 kWh/t / month | Dual-Discharge, Low-Velocity EC Fan Cooler |
| Vegetable Packhouse Ante-Room | 8.0°C to 12.0°C | 85% – 90% | 0.3 – 0.8 m/s | 4.0 – 7.5 kWh/t / month | High-SHR Ceiling-Suspended Unit Cooler |
A primary financial loss vector in post-harvest fruit operations is produce transpiration and weight loss (shrinkage). When an air cooler operates with a high coil $\Delta T$ (e.g., $T_{room} - T_{evap} > 6^\circ\text{C}$), excessive moisture condenses on the coil fins, draining away valuable sellable kilograms and accelerating ice buildup. Ice accumulation acts as a thermal insulator, decreasing heat exchange rates, choking fan airflow, and triggering frequent, energy-intensive defrost cycles.
Modern agricultural evaporators developed by Kewei Cold utilize large fin surface areas with inner-grooved copper tube arrays. By holding an operating $\Delta T$ within a narrow window of 3.0°C to 4.5°C, room relative humidity naturally stays above 90% to 95% without requiring external humidification power, reducing fruit mass shrinkage below 1.2% while trimming defrost energy consumption by up to 42% annually.
In post-harvest facilities operating near 0°C (such as table grapes, stone fruits, apples, and leafy brassicas), frost formation is unavoidable. Conventional timed electric defrosting introduces significant parasitic electrical loads, often consuming 15% to 25% of total evaporator power draw while inadvertently reheating the cold room. Transitioning to demand-based pressure-differential defrosting, combined with water defrost or hot gas bypass loops, removes frost in less than 8 minutes, dramatically shortening recovery pulldown runtimes and preserving product crispness.
Kewei Cold Chain Intelling Manufacturing Co., Ltd. is located in Danzao, an important town of Intelligent Manufacturing in southern China. The factory has a construction area of more than 40000 square meters. It integrates design, manufacturing and service,integrates all kinds of refrigeration products, intelligent software and cold chain supporting hardware, and realizes a complete cold Chain Intelligent Manufacturing ecology.
Equipped with robotic sheet metal punching, automatic tube expanders, and helium leak detection chambers, our 40,000 m² facility engineers commercial cold storage evaporators and condensing units designed to perform reliably under continuous agricultural harvesting conditions.
Since its establishment in 1998,it has risen rapidly in the refrgeration industry with its professional level and cutting-edge technology in R&D and manufacturing. In 2003, it obtained CE certification and IOS9001 international quality and management system certification; In 2010, a modern chemical plant focusing on the production of refrgeration equipment and other series productd was completed, and large amount of money was invested in the construction of several automatic production lines. In 2013, it became the first brand in the refrgeration industry; In 2015, the integrated refrigerator for cold storage was launched; In 2017, it became a cold storage engineering design manufacturer.
Over the past 25 years,the enterprise has been developing continuously. It is a high-tech unit in Guangdong Province,a private science and technology enterprise in Guangdong Province,a famous trademark in Guangdong Province,and a leading brand in the refrgeration industry.The company's innovative R&D technology,environmental protection and energy-saving product advantages,reasonable market price and perfect after-sales service have established Kewei as a leader in the industry.
The product has a reasonable fin design and high heat exchange efficiency, effectively lowering energy consumption during forced air agricultural pulldown cycles.
Using water defrosting and efficient hot gas distribution, the defrosting process is fast, saving substantial electric power in zero-degree holding rooms.
This high-efficiency unit is equipped with aerodynamically contoured blades that maximize throw distance while minimizing fan motor brake horsepower.
Explore our comprehensive lineup of energy-optimized air coolers, condensing units, and aerodynamic axial fan systems engineered for fruit and vegetable packhouses.
Precision temperature tolerance with low acoustic profile and reduced fan motor power consumption.
Engineered with corrugated hydrophilic aluminum fins to enhance turbulence and heat transfer coefficients.
Balanced air-throw design keeps temperature homogeneous across fruit pallet stacks, eliminating hot spots.
Matched scroll compression unit providing stable suction pressures and high COP under fluctuating post-harvest loads.
Using water defrosting and aerodynamic fan cowlings to lower defrost electrical load by over 30%.
High-efficiency axial fan assembly designed for high backpressure applications like forced-air fruit cooling tunnels.
Precision temperature regulation designed for fragile produce to prevent chill injury and cellular rupture.
Even two-way air throw creates draft-free environments for vegetable preparation and packaging zones.
Technical guidance for cold room operators, agricultural engineers, and packhouse facility managers.
Close fin spacing (< 4.5mm) increases initial heat transfer in dry rooms, but in high-humidity agricultural storage (90%+ RH), frost bridges the fins quickly. This chokes airflow, creates excessive static pressure, and forces frequent electric defrosting. Using 7mm to 9mm fin spacing on agricultural evaporators sustains airflow, extends intervals between defrosts by up to 300%, and cuts net daily kWh consumption by 18% to 26%.
Electronically Commutated (EC) fans consume 30% to 65% less electricity than standard shaded-pole or PSC motors. In a commercial 500-ton fruit holding facility where evaporator fans run 8,000 hours per year, upgrading to EC motors typically yields a financial return on investment (ROI) within 9 to 14 months based on standard commercial electricity rates.