By Edward G. Pita P.E.
Utilizing at the very least arithmetic, this article explores the elemental strategies of air-con and their program to platforms, explaining all strategies in a transparent, sensible demeanour. makes a speciality of difficulties and examples mostly encountered at the task.
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11 graphically describes this definition. 11(a) heat (Q) flows from the high tem- perature body, hot water, in the heating unit to the lower temperature body, the air in the room. 11 (b) shows that heat will flow from the higher temperature body, room air, to the lower temperature body, the air in the refrigerator interior, due to the temperature difference. 12. Of course if there is no temperature difference, there is no heat flow. The most common unit used for heat in the United States is the BTU (British Thermal Unit).
This number is said to have five significant figures, because the value of the fifth digit from the left is known. The number might be used to select a fan, and then to balance the system to obtain this flow rate. However, neither manufacturer's fan ratings or testing instruments can produce that accurate a value. Equipment and instrument ratings are often only accurate to within 2-5% of listed values, therefore there is no point in calculating or measuring data to an excess number of significant figures.
This approach will enable the student to communicate and work with others in the air conditioning field. T OBJECTIVES 5. Explain the differences among temperature, heat, and enthalpy and show the relationship between temperature scales. 6. Describe and use the energy equation. 7. Identify the changes that occur when a substance changes between its liquid and vapor states. 8. Use the saturated property tables for water and the sensible and latent heat equations. 9. Make some general conclusions regarding energy conservation in HVAC.
Air Conditioning Principles and Systems An Energy Approach by Edward G. Pita P.E.