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2009 ASHRAE HANDBOOK FUNDAMENTALS -CHP17_HEAT_LOAD-CALCS(1).pdf
The ASHRAE Technical Committees that prepare these chapters provide new information, clarify existing content, delete obsolete materials, and reorganize chapters to make the Handbook more understandable and easier to use. Chapter 9, Thermal Comfort, has new content on personal environmental control PEC systems; the effect of occupant and air motion on clothing insulation; and multisegment thermal physiology models. Chapter 10, Indoor Environmental Health, has new content on microbiology; health effects of fine particulate matter and noise; pathogens with potential for airborne transmission; semivolatile organic compounds SVOCs ; ozone; and dampness. Chapter 14, Climatic Design Information, includes a complete replacement of the data tables for locations worldwide—an increase of locations from the edition of the chapter. Chapter 18, Nonresidential Cooling and Heating Load Calculations, includes new plug load data, an elevation correction example, an equation summary, and an entirely new master example section based on the renovated ASHRAE headquarters building. Chapter 19, Energy Estimating and Modeling Methods, has new content on the comprehensive room transfer function CRTF method; ground heat transfer; a variable-speed vapor compression heat pump model; and validation, verification, and calibration. Chapter 26, Heat, Air, and Moisture Control in Building Assemblies—Material Properties, was extensively reorganized and updated with new content on insulation thermal conductivity data; insulation types; capillary-active insulation materials CAIMs ; and thermal resistance and air and water vapor permeability.
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T HIS chapter covers cooling and heating load calculation procedures for residential buildings, including detailed heat- balance methods that serve as the basis for cooling load calculation. Dehumidification Issues. Dehumidification occurs during cool- ing unit operation only, and space condition control is usually limited to use of room thermostats sensible heat-actuated Simple cooling-load procedures, suitable for hand calculations, are devices. Excessive sensible capacity results in short-cycling and provided for typical cases. Straightforward heating load calculation severely degraded dehumidification performance. In addition to these general features, residential buildings can be Procedures in this chapter are based on the same fundamentals as categorized according to their exposure: the nonresidential methods in Chapter However, many charac- teristics distinguish residential loads, and Chapter 18s procedures Single-Family Detached.