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SHENZHEN Cheap Los Angeles Rams Jerseys , Sept. 13 (Xinhua) -- Shenzhen MSU-BIT University, the first Sino-Russian university, held a ceremony on Wednesday to open its inaugural semester with the first class of 113 undergraduate students.


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When shopping for a new freezer or walk-in cooler it's easy to shop by price alone Cheap Green Bay Packers Jerseys , but this isn't always the best decision. Cost of operating your freezer and walk-in cooler is rarely part of the deciding factor but it is actually more important than just the initial cost. Your purchase price is a one-time cost while your monthly electric bill can add up over the years. Let's take a closer look at the insulation that is typically used with walk-ins; extruded polystyrene and foamed-in-place polyurethane.

Construction Process

Freezers and coolers are generally made of protective skin and insulating material comprised of modular panels. Fiberglass and metal are usually what makes up the protective skin. This serves the purpose of protecting your freezer's insulation which doesn't work independently and is actually quite fragile. Insulation is usually made of material that is foam plastic and bonded or injected in the middle of the metal skins. This is what gives the freezer or walk-in heat flow resistance, allowing it to hold the cold temperatures needed.

Insulation Types

With freezers and walk-ins there are two types of plastic foam insulation commonly used, extruded and polyurethane polystyrene. Expanded and Extruded polystyrene are not the same and shouldn't be confused. Expanded polystyrene has different insulating and structural properties and is white. We are going to stick to extruded polystyrene here.

Polyurethane

This insulation can be applied in two different manners during the construction of the freezer. It can be injected or poured between the two metal sheets in a mold to produce a panel for the walk-in. Less commonly Cheap Detroit Lions Jerseys , it is applied by box pouring a 4 foot x 20 foot block of foam. Next, this is cut to the desired thickness and then laminated between the metal sheets forming a panel for the walk-in.

Extruded Polystyrene

While this is the newest when it comes to freezer and walk-in insulation, it has been in use for several years in areas of high moisture as well as high R-value requirements such as cold warehouses. It’s made by extruding the polystyrene through a mold creating the panel to the size needed. It's then planed for perfection. Once finished it’s bonded between metal sheets and ran through a press to form panels for the walk-in.

What Does It Mean

Performance is generally rated in R-value; the higher the value the better insulated it is. Operating temps can affect performance. In comparison with temps from -10 degrees F to 50 Cheap Denver Broncos Jerseys , polyurethane comes out with lower R-values and extruded polystyrene has a higher value. This means polyurethane performs worse at lower temps and extruded polystyrene does better.

Moisture also affects insulation. Dew is often caused by the difference in temperature between a freezer and the outside. Water has a lower R-value than insulation and reduces its effectiveness. Polyurethane allows more presence of water vapor than extruded polystyrene, which means extruded polystyrene insulates better with high moisture conditions. Polyurethane also happens to lose three-quarters of its R-value in the course of five years while extruded polystyrene only loses a quarter. What this means is that a freezer using extruded polystyrene can save you tons of money in energy costs during its lifetime.


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