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Evaporative Cooling Pad – Efficient, Durable for Greenhouse

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Oct . 16, 2025 14:35 Back to list

Evaporative Cooling Pad – Efficient, Durable for Greenhouse

Inside the fan-and-pad revival: what’s really happening with greenhouse cooling pads

If you’re shopping for an evaporative cooling pad (often paired with high-efficiency exhaust fans), you’ve probably noticed the market heating up again. To be honest, after touring factories in Jinwang Western Street, Industrial Zone, Anping County, Hengshui, Hebei, China, I came back convinced: the classic fan-and-pad system is having a moment.

Evaporative Cooling Pad – Efficient, Durable for Greenhouse

What’s driving the trend

Energy prices, water-smart designs, and better resins. In fact, the new cellulose cores with anti-microbial treatments deliver higher saturation efficiency at lower static pressure. Many customers say they’re getting 7–10°C drops in midsummer greenhouses—of course, real-world use may vary with climate and water quality, per ASHRAE guidance [1].

System snapshot (fan + pad)

The “greenhouse ventilation cooling system” I inspected is straightforward: a bank of evaporative cooling pad panels on the intake side and high-volume fans on the exhaust side. The fan assembly—blades, belt pulley, hub, belt, bearings, supports, shutters, frame, safety mesh, and motor—pulls air through the wet pad, driving adiabatic cooling. Simple physics, still effective.

Evaporative Cooling Pad – Efficient, Durable for Greenhouse

Technical specifications (typical pad media)

ParameterSpec (≈ / typical)
Base paperCellulose kraft, 120–150 gsm, cross-linked resin
Flute geometry45°/45° or 45°/15° cross-corrugated
Thickness100, 150, 200 mm
Saturation efficiency≈ 75–92% @ 1.0–1.5 m/s face velocity [1]
Pressure drop≈ 20–45 Pa (clean, wet)
Water qualityTDS ≤ 800 ppm recommended; pH 6–8
Service life3–7 years (maintenance and water chemistry dependent)
Fire/moldASTM E84 and ASTM G21 options available [2][3]

Manufacturing and testing flow

Materials are cut, resin-impregnated, corrugated, and cross-laminated; then oven-cured (≈60–70°C), edge-sealed, and framed (galvanized or 304 SS). QC includes thickness tolerance (±2 mm), pressure-drop sampling, water distribution uniformity, and optional ASTM G21 fungal resistance tests. Fan assemblies get bearing run-in and shutter cycle tests. It sounds dry, but these steps really matter for a evaporative cooling pad that lasts.

Evaporative Cooling Pad – Efficient, Durable for Greenhouse

Applications and advantages

  • Greenhouses and nurseries: fast drop in canopy temps, better VPD control.
  • Poultry/livestock houses: heat-stress reduction without misting.
  • Industrial workshops, textiles, and even data center pre-cool (select sites).

Advantages? Low kWh per ton of cooling, modular maintenance, and—surprisingly—quieter than many DX systems. However, water management and scale control are non-negotiable.

Evaporative Cooling Pad – Efficient, Durable for Greenhouse

Vendor snapshot (real-world differences)

Vendor Paper/resin Mold test Lead time Certs
Yize Machine (Hebei) 150 gsm, high solids resin ASTM G21 pass (report on request) ≈ 12–20 days ISO 9001, CE (motor), RoHS
Vendor A 130 gsm, std resin Basic in-house ≈ 20–30 days ISO 9001
Vendor B Mixed lots Not stated ≈ 25–35 days -

Customization checklist

Height/width to fit bays, 100/150/200 mm thickness, 45/45 vs 45/15 flutes (airflow vs efficiency trade), edge coatings, galvanized vs 304 frames, PVC/PP water headers, and anti-scale dosing. For hotter, dry sites, I’d lean thicker pads and 45/45; humid sites, bigger fans and careful water recirculation.

Evaporative Cooling Pad – Efficient, Durable for Greenhouse

Case notes and field data

Shandong tomato house (2 ha): 150 mm evaporative cooling pad, 1.2 m/s face velocity, ΔT 8–11°C at 34°C DB/22°C WB; pad DP ≈ 28 Pa clean; ECaF fans pulled 38,000 m³/h per bay. Poultry site in Henan: dust load was high, but with weekly flush, pads held efficiency for an extra season—customers said maintenance felt “oddly easy.”

Final thought

Actually, the secret isn’t magic media—it’s balanced airspeed, clean water, and honest testing. Pick a supplier that shows you real ASTM/ASHRAE data and motor certificates, not just pretty photos. The rest falls into place.

Authoritative citations

  1. ASHRAE Handbook—HVAC Systems and Equipment, Evaporative Air-Cooling chapter.
  2. ASTM E84: Standard Test Method for Surface Burning Characteristics of Building Materials.
  3. ASTM G21: Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi.
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