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The closed cell formula creates the magic.
Let’s not beat around the bush. The reason a cold room panel with a polyurethane core works well for so long is basically the closed cell. Imagine a spongy dense material with completely closed and sealed holes. This is how high quality polyurethane core looks like. Cell structure is dense and the high tier closed cell systems are sealed at a rate greater than 95 percent for high tier systems^1. The gas is nearly thermally conductive. The sealed positions are impermeable and result in a panel achieving high thermal insulation with a thermal conductivity of 0.018 to 0.024 W/m·K^4. They are thus only half of what you would have with the rock wool boards. Not only is the thermal conductivity good, but the refrigeration system and the panel will work more efficiently and not let out as much cold. The sealed systems are effective and efficient, with a long term stability of temperatures.
Fall-Resistant
Temperature control requires more than just maintaining a temperature barrier. It requires the structure of the cold room remaining intact over the years. No one wants a cold room with stiff walls that start cracking over the years. The strength of poly rigid foam is both dense and impressively. It actually becomes stronger over the years, even if it's well below freezing. Polyurethane rigid insulation is built tough which is evidenced by the results of a curve test. The linear change rate of the rigid foam, even in -20 C, is a minuscule percentage of less than one. There is no cracking and no shrinking, and still, there is no warping. Because of poly rigid foam’s strength to weight ratio, there is excellent dimensional stability. This is impressive over the years. No one wants cold storage walls that start to warp and cause inconsistent flow, and a high quality cold room poly rigid foam panel stays true even with years of freeze thaw. It stands the test of time and is consistent over the years without the room becoming cold.
Gracefully Aging Without Deteriorating Fast
People are being all too silly thinking that foam insulation could rot or lose effectiveness in 10 years, particularly those with strange inquiries about the durability of these materials in the real world. Due to extreme insulating abilities, polyurethane cores can function for a long time. If the outer skin is undamaged, the other polyurethane core can. Board testing showed polyurethane foam boards installed and in use for 28-33 years, and still fully functional, and still met all the original performance numbers. The cell structures of the insulation core shield the internals of the insulation board from the external world, so moisture is balanced, pestilences are excluded. The average lifespan of a rigid polyurethane insulation board will be up to 30 years, and in some building applications, designs will be expected to last 50 years to 70 years. If the insulation used in the cold room is designed to last, then the cold room will be expected to last longer than the building. You are not signing up for a replacement project every few years. You are making a long time investment.
Moisture is a major problem for cold storage facilities. It is really bad for cold storage insulation because it soaks up and holds heat. It makes insulation less effective, stronger, and does not absorb water. When water gets cold enough, it expands. This will cause cold room storage panels to crack. When insulation gets wet, nasty things can grow. This is bad for anything you may want to store or contain. Polyurethane https://www.glostar-panel.com/ were designed to out do all of the problems presented above. Because of it's closed cell structure, it does not like water. Because the cell walls of the insulation span almost 95 to 98 percent of the total volume, there is less of a likelihood of moisture getting in there. Because the closed facing of the cold room storage insulation panels is water proof and moisture absorbent, there is much less of a likelihood of moisture appearing. This water absorbent will not change. There is not a case, such as in a water storage facility where the closed room storage may get tilted. This is the same case in a water storage facility, and closed storage panels will create a barrier to the water. In the case of water storage where the storage room will get tilted and the closed top may remain dry. The insulation will remain dry and moisture and keep the same temperature, and the unit as well.
Thickness Determines Temperature
Panels tend to ensure consistent temperature for many years since it is designed for specific usage. Not just any size would do. Have strict requirements. For every decrement you need, increase thickness. For basic chilling, which would not go below 5ºC, you could look for 50mm thickness. For running a freezer at minus 18ºC, you go for 100mm to 120mm, and for blast freezers at minus 35 or 40ºC, you should look for thickness of 150mm to 200mm of polyurethane. From the external temperature and internal temperature of the freezer, the thickness of polyurethane foam panels is determined. A panel that is 100mm could easily handle a differential of 30ºC, making it ideal for a minus 15ºC. For a minus 40ºC, a 200mm panel for a differential of 75ºC is recommended. The temperature is smooth and even and should not be cycling. For a panel that is not working at its limit for the application, its capacity is more than adequate. A panel that is working at its limit means it would be quickly deteriorating its performance and would not even be able to maintain the temperature.
The Secrets in the Joints and Seals
The best foams on the market will not do you a bit of good if the air leaks through the joints and seams in the panels. That's why the connection systems are equally as important as the internal materials. A state-of-the-art cold room panel employs a tongue and groove joint that meshes together like interlocking puzzle pieces. This creates a cold air labyrinth that interlocks the adjacent panels. Over and around these joints is a flexible EPDM gasket sealed void, leaving a virtually impenetrable air seal. Once the panels are interlocked and fastened with cam locks, the center joint in the panels behaves monolithically. This monolithic characteristic of materials does not allow the passage of air, gas, or moisture. Joints imply voids, and voids mean there is no air to condense. Fewer voids means a reduction in condensation, and a reduction in condensation means a decrease in frost, which means a decrease in the compromise of the internal insulation materials. This is a characteristic of the internal materials. The elastic materials that comprise these internal joints do not easily crack or dry, so they retain their elasticity and do not externalize themselves. For this reason, the cold room's envelope remains interlocked from the means of installation. This interlocking characteristic is a major factor to why the insulation remains stable and the internal conditions remain consistent. This state-of-the-art building system leaves little to no expansion and/or contraction throughout the system, monolithically maintaining seal protection for decades.
Wrapping It All Up
So what makes a cold room panel with a polyurethane core such an excellent insulator? It comes down to a combination of several smart design choices demonstrated throughout this article. You have closed cell foam that traps an insulating gas. You have dimensional stability that prevents warping. You have ten proven multi-decade aging resistance. You have moisture resistance that forces moisture out. You have thickness choices that perfectly match panel to need. You have very tight joint systems that interlock to prevent moisture intrusion. You have insulating cold room panel systems that make an excellent insulator for whatever you're storing, be it meat, produce, or life saving drugs. Polyurethane panels are excellent compared to other systems. This explains why people with cold storage rely on polyurethane to insulate their cold room panels.