Evaporative Cooling Pads for Greenhouse Cooling

‌I‌. System Overview

The PVC drainage ditch evaporative cooling system is an evaporative cooling device mainly made of polyvinyl chloride (PVC). It is widely used for summer cooling in greenhouses, livestock farms, and other facilities. The system utilizes the principle of evaporative heat absorption, where water evaporates as it passes through a cooling pad in contact with air, effectively removing heat and achieving efficient temperature reduction.

II‌. Core Components

Structural Features

Integrated Water Collection Tank Design: The tank can hold all the water required by the system, eliminating the need for an external water tank.

Rodent-Proof Cover: The tank cover is designed to prevent rodents from entering while optimizing the return water flow.

Modular Installation: Employs snap-fit ​​connectors; lengths can be flexibly combined.

‌III‌. Working Principle

The PVC Deep Sump Evaporative Cooling System operates through the following cycle:

1. Water Circulation: The circulation pump draws cooling water from the deep sump and delivers it to the distribution pipe at the top of the cooling pad.

2. Uniform Water Distribution: Water flows evenly across the corrugated surface of the cooling pad via the flow guide.

3. Evaporative Heat Absorption: Hot, dry air is drawn through the cooling pad by the fan. As water evaporates from the pad surface, it absorbs latent heat from the air.

4. Cooled Air Delivery: The air exiting the cooling pad is cooled and humidified before entering the greenhouse or facility.

5. Water Recirculation: Un-evaporated water returns to the deep sump and is recirculated after automatic makeup water replenishment.

The heat required for evaporation is drawn directly from the air itself, requiring no additional energy input—this is the core principle behind the system’s energy efficiency.

‌IV‌. Key Advantages

Corrosion Resistance and Long Service Life

• PVC Material Advantage: All components are manufactured from UV-stabilized PVC or stainless steel, offering complete corrosion resistance—no rust issues.

• Extended Lifespan: PVC cooling pads have a significantly longer service life compared to traditional paper-based pads, eliminating the need for frequent replacement.

Water Conservation and Environmental Friendliness

• Recirculating Water: System water is continuously recirculated within the deep sump; only evaporative losses require replenishment.

• Automatic Makeup: A float valve automatically maintains water level, simplifying management.

Easy Maintenance

• Easy Cleaning: PVC cooling pads can be cleaned directly with a pressure washer without risk of damage.

• Accessible Inspection: The flow guide features a hinged design, allowing easy opening to inspect water distribution.

• Quick Replacement: Cooling pads are secured with clip-on fasteners, enabling tool-free replacement.

High Cooling Efficiency

• Optimized Water Distribution: The specialized flow guide design ensures complete pad wetting while minimizing water splash, maximizing evaporation efficiency.

• Low Air Resistance: PVC cooling pads offer low pressure drop (only 0.40 inches of water column at 300 ft/min air velocity), reducing fan energy consumption.

Hygiene and Safety

• Mold and Bacteria Resistance: PVC material does not support mold or bacterial growth, ensuring a hygienic environment for crop production or livestock rearing.

• Rodent-Proof Design: The enclosed sump cover effectively prevents rodent intrusion into the system.