The evaporating temperature is determined by the design temperature of the cold, generally 5 ° C lower than the coolant (indirect cooling) temperature and 10 ° C lower than the cold air temperature (direct cooling). In some cold rooms where the relative humidity requirements are very strict, the difference between the cold air temperature and the evaporating temperature varies depending on the requirements of the relative humidity between the cold, such as the cold room for storing fruits and vegetables, and the value of the nail requires 90%, then the TE value Should be controlled at 5-6 °C. Reducing TE means increasing the evaporation temperature, which is beneficial to reducing the dry consumption of food, and is also beneficial to improving the operating conditions of the refrigerator and increasing the cooling capacity of the refrigerator. Cooling systems are classified into direct cooling systems and indirect cooling systems. Direct cooling uses the evaporation of the refrigerant to directly cool the object to be cooled; and indirect cooling refers to the transfer of heat from the object to be cooled to the refrigerant through the intermediate medium. Evaporation circuit This circuit consists of the cooling equipment and valves and pipes of the cold room. Commonly used cooling equipments include cooling pipes (wall pipes, top pipes, shelving pipes, etc.), air coolers (or chillers), and evaporators for cooling liquids (horizontal shell and tube, riser type) , spiral tube, etc.). The cooling pipe is gradually replaced by the air cooler because of the poor heat exchange effect, the large amount of steel and the difficulty in defrosting. Evaporators for cooling liquids are typically used in indirect cooling systems. An air cooler is a cooling device that forces air circulation. Dry chillers are widely used in cold storage. They are divided into two types: floor-standing and ceiling-mounted. Each is divided into three types: freezing, cooling and freezing. The air cooler is composed of a rack (including a water receiving tray, a flushing water pipe or an electric heating pipe, etc.), an evaporating pipe group (ie, a cooling coil), and a fan (a split flow type and a centrifugal type). Floor-standing chillers are generally bottom-in and top-exhaust, so the fan is installed in the upper part, and the ceiling-type chiller is generally side-in, side-discharge (single-side air supply) or bottom-in and side-exhaust ( Double-sided air supply type), the fan is mounted on the side or bottom. Since the load between the cold rooms is not constant, especially in the freezing room and the cooling room, the load is large when the goods are fed, and the load is gradually reduced during the cooling process. Therefore, in order to adapt to such load changes, the cooling fan should adopt a double speed (also called variable air volume). Fan. When the load is large, the wind speed and the large air volume are used, and the cooling speed is fast; when the load is small, the small wind speed and the breeze amount are used to reduce the dry consumption of the food. According to the different ways of returning the liquid, the chiller is divided into two types: “up and down†and “down and downâ€. "_Upward and downward" has the advantages of less refrigerant circulation, no liquid column static pressure and oil stains not staying in the cooling coil. The disadvantage is that it is difficult to achieve uniform liquid supply. "Bottom in and out" can uniformly supply liquid and better exert the heat transfer effect of the cooling coil. The disadvantage is that the circulation of the refrigerant is large, and there is a liquid column, especially the oil is easily retained in the cooling coil.
Purpose of visor for Bike Helmet:
While we are riding with this kind of helmet with visor installed on the helmet above our eyes, not only can protect our face and eyes from tree branches along the road track . The visor acts as a shield against all the low hanging tree branches. When the rider is at higher speed, these branches can work as a whip and put a high amount of pressure on the rider's face. But also is very stylish, people love to have our bike helmet to protect them and also make them outstanding when riding the bike.
We had developed and produced many new helmets. In order to make helmets with good quality and affordable price, we try our best to achieve that. Before deciding on one as it provides comfort for you while cycling, you really need to take care of yourself with a good bike helmet. If you are riding a bike at least twice a week, usually with visor type won`t let you down.
Bright day riding lovers need to consider the helmet should prevent sunburn. In fact when wearing a fully protected bicycle you will be able to see through your sunglasses no matter what! This is important for those wanting safety while exploring urban places or doing nature walks like trail runs. The good news of these types, protective helmets and their ability with protection against sunlight are not limited only by one area such as cycling in summer.
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