By Samuel C. Sugarman
Updated with chapters on ventilating and arduous platforms and HVAC structures, this 3rd variation of a bestseller covers the diversity of HVAC structures. The coverages is into elements and controls for air, water, heating, ventilating, and air con and readers will research why one part or procedure can be selected over one other. New details is incorporated on occupancy convenience, procedure functionality, thermodynamics, warmth move, construction envelope conditioned house, heating and cooling load calculations, air duct basics, water pipe basics, variable circulation water platforms, refrigeration elements, piping basics, crucial plant water chiller optimization, and the most recent warmth restoration technologies.
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Extra resources for HVAC Fundamentals
Determining Air Properties from the Psychrometric Chart Exercise: The return air from a conditioned space has these two prop- 34 HVAC Fundamentals erties: 75°FDB and 50%RH. 073 pounds per cubic feet (calculated) Using the Psychrometric Chart Exercise: An HVAC engineer has determined that the optimum indoor temperature for a conditioned space in Wichita, Kansas is 75°FDB at 63°FWB. The design outside air is 98°FDB, 73°FWB. The conditioned space design sensible cooling load is 194,400 Btuhs and the total load is 228,700 Btuht.
A seated person in an ofﬁce, for instance, gives off approximately 225 Btuh of sensible heat into the conditioned space. Enthalpy units of sensible heat are in Btu/lb°F. The change in the sensible heat level as measured with an ordinary thermometer is sensible temperature. Sensible temperature is measured in degrees Fahrenheit (°F) and it is indicated as dry bulb (db) temperature. Sensible temperatures are written °Fdb. For example, 55°Fdb. ” The heat released by boiling water is an example of latent heat.
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. On the psych chart, enthalpy represents the energy in 28 HVAC Fundamentals one pound of dry air and the grains of moisture associated with it at a given condition.