Heat is a kind of energy to cold environment from hot environment. Cooling purpose is to keep the temperature at a value below the ambient temperature of a material. Therefore, each external medium from the cooled material towards the heat flow will occur. Thermal conductivity is a material property of the molecular structure. Heat transfer capability of each item is different from some of the ingredients per unit of time is called proofing very little heat they transmit. Heat transfer is not possible to completely prevent this transition can only be slowed or decreased.
Coolers are equipped with a cooling system to keep the indoor temperature low. Refrigerant is often inevitable need for insulation is made of good heat conducting metal material. In the cooling systems of the account, installation and the operation (the test) insulation quantity and unit of time is taken into account the amount of heat. Insulation material per unit of time the amount of heat transmitted by selecting the most important subject material, price is the shape and practices. Another aspect of the capacities of the insulation material to hold moisture and water. Plenty of water droplets create a water-resistant insulation material not Cooler surfaces with condensation moisture in the air very quickly loses its properties and rot.
Heat insulation is not limited to the body and lid. Special glass, known as Glass, used to prevent air from leaking from the doorway of an insulating material in special fuse. Although a lot of attention to the dimensions and construction techniques can sometimes occur small gaps and holes. Silicone sealants and the like to be used to gain heat by air leakage from the cavity. Another issue of particular commercial coolers heat gain is lighting. They produce heat-saving fluorescent or incandescent lamps beside although not as abundant as illumination elements, known as a lamp.Today, LED lighting elements as well as lower power consumption and is widely used in studying the cooler with less heat production.
Insulation Materials for the cooling system
For cooler in polyurethane and polystyrene insulation it is generally used. Styrofoam is used because it is convenient to use metal skeleton sweating and moisture buildup inflated cork or wood sawdust compressed slabs to prevent moisture build-up of both support and styrofoam. Styrofoam, with inflation and formwork system of polystyrene particles produced by fusion method. Expanded polystyrene rigid foam (EPS) thermoplastic, closed cell, it is a white thermal insulation materials.Styrofoam, often building walls as insulation material used in roofs and floors. In cooler it is easily applied and is preferred because of cheapness. Due to the ease of application in workshops that manufacture commercial coolers are widely used especially in the manufacture of refrigerators showcase.
Styrofoam is not easily used only for decoration and adornment for the insulation is processed.Styrofoam, based on the area of use is produced in the desired concentrations. Features density of the waste material can be replaced in the desired direction and do not cause unnecessary cost increases. Thermal insulation in order usually 15-30 kg / m3 density, for use as packaging material in the 20-100 kg / m3 is produced in intensity. This is known as density and density units 20 are usually sufficient insulation density refrigerant. Effective feature of materials on water absorption rate, is that the pores open or closed. The water absorption rate of closed pore material in direct contact with water is very low and polystyrene, closed cell material. Even if direct contact with water because the water absorption rate is very small, properties change. Another insulating material known as polyurethane have also found a lot of areas in recent years. Polyurethane foam or polyurethane-based products are the two main ingredients to put them in a chemical reaction catalysis and swell (foam) it consists of providing chemical additives.
It starts with the interaction of the polyurethane formation phase constituents of the chemical composition as shown in the figure above. A creamy formation observed 25 seconds time interval 5 when the chemical mixture reaction. Since the end of creaming time begins to foam rise and expansion. After a time it stops rising. Is the duration of gelling time between the stop and the start of the rise. This foam also called blistering or iplikleş time. If it touches the foam at the time of the rise of foam stop sticks addressed. After a while the foam does not stick when touched, handled or touched object. The end of the swelling, until it touches touching time period is called adhesion. After the polyurethane hardens while touching and filled container where tightly. Polyurethane rigid and filling in the form of both insulation and solidify feature skeleton due to home refrigeration sees duty.
Hair will fit into each other with the help mold the hook mounts the interior plastic that adjusting gaps in the interior of the refrigerator forms the outer image, as seen in the picture above. Polyurethane foam is sprayed between the hair and the plastic inner housing. Polyurethane, interior and exterior insulation fulfilling its duty ensures the proper cooling and taped together. Polyurethane during chemical reactions are hazardous to health. Direct contact, smelled or caution should be exercised in a way it might lead to very dangerous consequences to be taken into the body. Commercially sold as spray polyurethane foams are usually used during compression and assembly. A good cost comparison should be made to use as insulation. Penetration and is more advantageous in terms of durability polyurethane. Fill the gap in terms of volume without insulation which ensures superior than styrofoam. Although not very common, except polyurethane and polystyrene plates and compressed wood ripped sheets in various sizes, which are manufactured from wood shavings used as supportive styrofoam materials are also available.
Cooling System Isolation Techniques
Sealants used in household refrigerators is usually polyurethane foam. Factory production in a warm mixture of polyurethane machine is poured between the hair and the plastic inside the cabin. To fill all the gaps cools expanded polyurethane hardens. If used in polyurethane surface it is applied by spraying spraying. It has been building insulation and a large surface of the insulation in order to reduce the costs of using large machines polyurethane market in accordance with small-capacity product for use in the workshop.
When applied to the surface can stick to any ground. To be free from grease and dirt from the ground will be sufficient. At the end insulation it does not create thermal bridges when material is excised. It is made using Styrofoam insulation should be secured primarily by the extent of gluing cut-up silicone adhesives or special styrofoam. Styrofoam is made from wood fibers or hardboard used to support the implementation of the shell surface.
Hardboard, high-density wood fiber board is obtained by applying high pressure and heat by the wet method. Due to the natural structure it is not harmful to human health and also environment-friendly product. Styrofoam cutting very smooth edges have been undertaken, as a result of air leakage from the heat gain can be made by filling therefore edge silicon and other materials. Supporting the view inside the plexiglass and coolers available to make it more aesthetically pleasing. 25 mm thick Plexi are sold in 1.5 and 1000 x 3000 mm. Desirable color and degree of cutting may be formed by heating to 90-130 ° C. If you are the preferred insulation applications which must be studied carefully goggles, masks and gloves used it should be the body of chemicals, etc., directly or respiratory route should be avoided.
Source: MEGEP, Insulation Materials for cooling