By Samuel C. Sugarman
Updated with chapters on ventilating and hard structures and HVAC platforms, this 3rd variation of a bestseller covers the diversity of HVAC structures. The coverages is into parts and controls for air, water, heating, ventilating, and air con and readers will study why one part or approach should be selected over one other. New details is integrated on occupancy convenience, technique functionality, thermodynamics, warmth move, construction envelope conditioned area, heating and cooling load calculations, air duct basics, water pipe basics, variable move water platforms, refrigeration elements, piping basics, imperative plant water chiller optimization, and the newest warmth restoration technologies.
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Extra info for HVAC Fundamentals
Density and speciﬁc volume are reciprocals. Once speciﬁc volume is found on the psych chart, density is calculated using the equation: density = 1/speciﬁc volume. 33). Enthalpy Enthalpy (h) is a thermodynamic property, which serves as a measure of heat energy. Chapter 2 discussed heat in terms of temperature and Btu. To review: temperature is an indication of heat intensity and Btu is the quantity of heat in a substance. Enthalpy is the measurement of the heat content of a substance used in psychrometrics to ﬁnd the amount of heat necessary for various processes.
The air leaves the cooling coil at 55°FDB, 53°FWB and 90%RH (B). A line drawn between the two points illustrates the changes in the air as it goes through the cooling and dehumidifying process. ” The dry bulb temperature, wet bulb temperature, dew point temperature and speciﬁc humidity decrease. Relative humidity has increased. HVAC CALCULATIONS AND THE PSYCHROMETRIC CHART A condition point is the condition of the air at a given point in the HVAC system such as the supply air, room air/return air, outside air, mixed air, entering or leaving a heating or cooling coil, etc.
Standard Air Dot Some psych charts have a dot indicating standard air (#14, Figure 3-1). Standard air is dry air with the following properties: 30 HVAC Fundamentals Table 3-1 ———————————————————————————————— Speciﬁc Humidity Air Temperature Relative Humidity ———————————————————————————————— 60 gr/lb 60 gr/lb 60 gr/lb 100ºF 70ºF 55ºF 21% 54% 94% ———————————————————————————————— inch Temperature ≈ 70°F. 075 pounds per cubic foot HVAC PROCESSES ON THE PSYCHROMETRIC CHART Sensible Heating Sensible heating is heat added to the air, which causes the air temperature to increase.
HVAC Fundamentals by Samuel C. Sugarman