Heat Transfer Defined
Heat transfer is the movement of heat from one place to another, or within a substance or between substances. Heat exchange is also called heat transfer, the heat flow and the heat flow. This movement of heat from one place to another, or within a substance or between substances. With a mechanical refrigeration is the movement of heat, heat transfer business refrigeration service people.
Previously, we hooked up with the idea of cooling with Central air conditioning and household refrigerator. Each of these requires several steps, heat transfer to achieve the goal. The heat content is not the same thing as heat transfer. Enthalpy is involved, how much thermal energy contained in matter. Heat transfer, on the other hand, are treated as a lot of heat moves from one substance to another. Remember, when the heat is transferred to the heat content of the original substance falls by the same amount that the heat content of the destination substances increases.
Like all forms of energy, heat flows from a higher energy level to a lower energy level.
It may help to think of heat, like a flowing "downhill"as water. If the water level is the same for the two ponds, connected by a channel, no water flow between them. If one above the other, streams of water in a pond on the lower level. Similarly, heat will flow without temperature difference. Then, it flows from a higher energy level (warmer) to the lowest (cooler). Just like water, the greater the difference in temperature, thefaster it flows.
In the occupied area in cold climates, heat will flow out. Heat loss. When it is hot outside, heat flows from the hot outside air into the cooler air in the room. This heat gain. If the temperature inside and outside the premises, no heat will flow. No heat from the space, nor heat gain in him.
Similarly, if the temperature of the air that passes through the coil higher than that of the refrigerant in the winding pipes, heat will flow from the air into the refrigerant. Coil, in this case, provides cooling capacity. If the refrigerant temperature is equal to the air flowing through the coil, there is no heat transfer, and, therefore, the cooling capacity is provided by the coil. If the temperature is lower than that of the refrigerant in the winding pipes, heat will flow from the refrigerant inside the coil to move the air through the coil. Because the air heats up, we can say that the coil provides heating capacity in this situation...
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Refrigeration 
