Auto Parts are components of an automotive, and serve for automotive.
As the machining market competition of automotive parts increased fiercely , the concept of environmental protection, and continuously upgrade on the technology, these years, the auto parts are being procured world widely.
In terms of the application, auto parts can be divided into engine system, running system, steering system, braking system, and body accessories.
In daily life, in automotive industry, we can easily find auto parts, such as Piston, connecting rod, crankshaft, crankshaft, piston ring, flywheel, pressure plate, clutch, gearbox, variable speed shift operating mechanism, transmission shaft, universal joint, the wheel hub etc.
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Whether it is heating or cooling, we must keep warm, we must close the doors and windows, to minimize the exchange of internal and external temperatures. But don't forget that there are many heat sources in the room, such as people, electrical appliances, cooking, and in winter, the indoor temperature can be 5-10 degrees higher than the outdoor temperature.
In the summer these heat sources still cause the room temperature to rise. The favorable factors in the winter have become an unfavorable factor in the summer. At the same time, despite the adoption of insulation measures, radiation heat dissipation cannot be avoided. In winter, the indoor temperature is dissipated outward and the heat source is small. In summer, the outdoor temperature is high and the heat source is large. In the summer, the amount of heat received from the outside is much greater than the amount of heat emitted from the interior in winter.
To sum up the above two points, if the outdoor temperature in winter is -5 degrees, as long as the heating is increased by 10 degrees, the indoor temperature can be brought close to 15 degrees, and the human feeling is enough. In summer, if the outdoor temperature is 35 degrees, the cooling needs to be reduced by 20 degrees in order to make the indoor temperature close to 30 degrees.
Therefore, the amount of heat that needs to be released in summer cooling is much higher than that in winter. The demand for cooling is higher than heating.
2. Since the freezing point of water is 0 degrees, the "heat capacity" that cold water can provide is less than that of hot water.
In winter, 50 degrees of hot water can be provided, and there is a temperature difference of 50 degrees relative to outdoor. The coldest summer can only provide 0 degrees of cold water, compared with only 30 degrees outside the temperature difference.
The efficiency of refrigeration is only about half that of heating.
Therefore, the ability to cool with cold water is much less than that with hot water.
3, condensation. The water droplets on the cold water pipe make the home moist, and the humidity will feel hotter.
In fact, some schools use ice cubes for cooling in the summer, and some ice cubes will be placed on long-distance trucks. But used experience is very general, far worse than air conditioning.
1. The requirements for winter heating are not the same as the requirements for summer cooling.