evaporative cooling pad, made of corrugated cellulose materials with honeycomb-like structure, is used in evaporative air cooling

pad cooling evaporative honeycomb swamp cooler pads desert corrugated cellulose structure background pattern abstract texture water paper isolated air moistening effect inside panel tree education agriculture plant engineering engineer agricultural greenhouse refrigerator hydroponic planting arrangement thermodynamics heat transfer exchange thermo equipment industry recycle recycling manufacture fibre conditioner dirty efficient materials honeycomblike used systems cool evaporation isolate white