Choosing PVC-Framed Evaporative Cooling Systems for Greenhouses and Poultry Houses

PVC-framed evaporative cooling pad systems achieve efficient cooling by utilizing the principle of heat absorption through water evaporation, offering energy efficiency far superior to traditional compressor-based refrigeration. Featuring advantages such as corrosion resistance, rodent-proof design, integrated water collection troughs, and modularity for easy maintenance, these systems are widely used in international agricultural markets for greenhouses and poultry houses. With cooling efficiencies reaching 80–90%, key selection criteria include pad thickness, dimensions, and honeycomb flute angles.

What is a PVC-framed evaporative cooling pad system?
The core principle of evaporative cooling is simple: as warm air passes through a wetted, honeycomb-structured pad, the evaporation of water absorbs heat from the air, thereby lowering the air temperature. This process eliminates the need for compressors or refrigerants, achieving significant cooling solely through natural water evaporation.

PVC-framed systems engineer this principle into a practical solution: the evaporative pad is secured within a frame made of corrosion-resistant PVC, which integrates the water distribution system, bottom collection trough, and structural supports. Compared to traditional aluminum or stainless steel frames, PVC frames offer superior resistance to corrosion and aging in humid environments while remaining lightweight and cost-effective.

Why are PVC-framed systems highly favored in the market?

Significant Energy Efficiency
Evaporative cooling consumes far less energy than traditional compressor-based refrigeration. The Coefficient of Performance (COP)—the ratio of cooling output to the electrical input for pumps and fans—is a key metric for measuring the system’s efficiency. For large-scale greenhouses or poultry houses, this translates to substantially lower electricity costs—an advantage that is particularly pronounced in regions with sustained high summer temperatures.

Reliable Cooling Performance
Data indicates that evaporative cooling pads can achieve efficiencies of 80% to over 90%. By properly selecting pad thickness (ideally 100–150 mm) and airflow velocity (0.6–1.6 m/s), the temperature of air entering the facility can be reduced by 9°C or more. For poultry houses, this effectively mitigates heat stress, helping to maintain feed intake and weight gain in the livestock.

Optimized Structural Design
The design details of modern PVC frame systems are noteworthy:

Uniform Water Distribution: A specialized baffle design ensures water permeates the entire surface of the cooling pad evenly, preventing efficiency losses caused by dry spots. Some systems feature integrated hinged baffles that can be opened without tools for inspection and cleaning.

Integrated Water Trough: The bottom trough of the PVC frame holds the entire volume of water required by the system (approximately 30 liters per meter), eliminating the need for a separate external water tank. A float valve system automatically maintains a constant water level, reducing water waste.

Rodent-Proof Design: The trough cover is specially designed to prevent rodents from accessing the water, a feature crucial for maintaining hygiene in poultry houses and grain storage facilities.

Modular Installation: A snap-fit ​​profile design simplifies installation and pad replacement, allowing non-specialists to handle routine maintenance.

Cost-Effectiveness Throughout the Lifecycle
In terms of procurement costs, PVC frame systems are generally more competitively priced than those made of stainless steel or aluminum alloy. Regarding service life, the corrosion-resistant properties of PVC ensure greater durability in environments with constant high humidity, eliminating the need for frequent frame component replacements. While the cooling pads themselves are typically replaced on an annual basis, the frame system is designed to last for over a decade.