Cold storage panel selection and pit avoidance | Polyurethane insulation board density, flame retardant grade, vapor barrier layer, floor insulation
The core of cold storage insulation is polyurethane storage board, and the insulation performance and structural strength directly determine the unit load, electricity cost, and condensation inside the storage.
Low temperature cold storage (-18 ℃ and below) recommends a plate thickness of 100-150mm and a density of ≥ 40kg/m ³; Use 75-100mm boards for the preservation warehouse at 0-5 ℃.
Flame retardant rating: B1 level flame retardant, B2 level flammable, priority given to B1 level for cold storage projects; Many low-priced projects use B2 or even B3 boards, which fail fire safety inspections and pose a high risk of fire.
The vapor barrier is a weak point in many engineering projects. When water vapor penetrates into the insulation layer, polyurethane fails to absorb water, and the insulation deteriorates year by year. The interior of the storage board bulges and freezes.
Xitelide's supporting cold storage plan includes the use of neutral silicone sealant on the seams of the storage panels, double-sided vapor barriers on both the inside and outside, and the installation of vapor barriers at the cold bridge position to block the cold bridge.
Floor insulation is easily overlooked. If the low-temperature warehouse floor is not insulated, the ground will frost heave and crack, and the bottom of the warehouse board will be pushed and deformed; The floor of the low-temperature warehouse must be insulated and moisture-proof.
Many low-priced storage boards have insufficient density, and foam materials are secretly reduced, resulting in a soft touch. After six months of use, insulation deteriorates, and the unit runs at full load for a long time, causing power consumption to soar.
Prefabricated cold storage for foreign trade exports is subject to rough sea transportation, and the steel plates used for the storage panels are made of color steel plates with a thickness of 0.6mm or more. Thin steel plates are prone to bumps and dents, which can damage the vapor barrier layer.
The gaps between the warehouse panels and the door frames are the hardest hit areas for heat leakage. The door frames are equipped with electric heating wires to prevent condensation, and the door seals are regularly inspected for aging, resulting in leakage of cold from the door seams.
Judging whether insulation is good or not: Under the same operating conditions of the unit, the startup ratio, return air pressure, and whether there is condensation on the outer wall of the storage plate, condensation on the outer wall=steam insulation failure.
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FAQ
What is the recommended plate thickness for a low-temperature warehouse at -18 ℃? 100–150mm， Density ≥ 40kg/m ³.
2. What is the priority flame retardant level for cold storage? B1 level flame retardant.
What does condensation on the outer wall of the storage board represent? The vapor barrier fails, and water vapor seeps into the insulation layer.
4. Should the low-temperature warehouse floor be insulated? It is necessary to prevent the ground from freezing and cracking.
How to deal with cold leakage in the door gap? Heating wire for door frame, regularly replace aging door seals.
6. Long term consequences of insufficient density of storage boards? Insulation attenuation leads to increased unit load and high power consumption.
What is the recommended thickness for steel plates in prefabricated cold storage? ≥ 0.6mm color steel plate.
