The ASHRAE Handbook is published in a series of four volumes, one of which is revised each year, ensuring that no volume is older than four years. The Handbook can be purchased at the ASHRAE Bookstore by clicking on this link.
TC 4.1 is responsible for writing and maintaining the following two chapters in the ASHRAE Handbook - Fundamentals Volume
Cooling Load Calculation Methods. Heat balance method (HBM) Radiant time series (RTS) method. Application of the RTS method and the CTS method. Heating Load Calculation Methods. Worked Examples. Appendix A10.1 - MATLAB Code for Cooling Load due to People. Appendix A10.2 - MATLAB Code for Cooling Load due to Wall Conduction. ASHRAE Fundamentals presents a RTS method in detail for cooling load calculations. The RTS approach may be further developed by combining relevant equations, and sorting and rearranging equations in a close-form. The close-form of the RTS approach can reduce the amount of calculations, and is useful for developing a new procedure to.
Chapter 17 - Residential Cooling and Heating Load Calculations
This chapter covers cooling and heating load calculation procedures for residential buildings. It covers detailed heat balance methods that serve as the basis for the cooling load calculation, and simplified cooling load procedures suitable for hand calculations. Discussion of straightforward heating load calculations are also included.
Chapter 18 - Nonresidential Cooling and Heating Load Calculations
This chapter covers cooling and heating load calculation procedures for non-residential buildings. The chapter starts by explaining fundamental load calculation principles. Next the common elements of cooling load calculation are described (e.g., internal heat gain, ventilation, infiltration, moisture migration, fenestration heat gain). Finally, two methods of heating and cooling load calculation are discussed: the heat balance (HB) method and the radiant time series (RTS) method. Extensive examples using the ASHRAE HQ buiiilding in Atlanta are used to illustrate application of the principles described in this chapter.
TC 4.1 is working on the revision of these chapters for the 2025 edition of the ASHRAE Handbook - Fundamentals.
Comment on the Handbook: ASHRAE welcomes your comments on the Handbook or a specific Handbook chapter. To submit a comment about any aspect or part of the Handbook series, you can use the Handbook Comment Form.
Review a Handbook Chapter: To provide your feedback about a specific Handbook chapter, you can answer the brief survey questions on the Handbook Chapter Review Form.
Commercial HVAC 'ASHRAE' Loads
Chvac quickly and accurately calculates the maximum heating and cooling loads for commercial buildings. The cooling loads can be calculated with either the CLTD method or the new RTS (Radiant Time Series) method. The program allows an unlimited number of zones which can be grouped into as many as 100 air handling systems. Chvac automatically looks up all cooling load and correction factors necessary for computing loads. In addition, it can look up outdoor design weather data for over 2000 cities located around the world. There is also provision for editing the weather data as well as adding data for other cities. Comprehensive reports list the general project data, detailed zone loads, air handler summary loads, outside air loads, total building loads, building envelope analysis, tonnage requirements, CFM air quantities, chilled water flow rates (if applicable), and complete psychrometric data with entering and leaving coil conditions. Other outstanding features include ASHRAE Standard 62 analysis, automatic building rotation, 360 degree wall orientations, tilted glass, exterior shading, internal operating load profiles, variable indoor design temperatures, people diversity, pretreated outside air, seasonal infiltration and ventilation rates, reheat loads, duct gains and losses, and return air plenums. Chvac project data files can also be used by Elite Software's EZDOE energy analysis program.
Cooling Load Calculation Rts Programming
Features
Calculates Peak Heating & Cooling Loads
Determines Building Tonnage and Room CFM Requirements, and Runout Duct Sizes
Uses either the RTS or CLTD calculation method
Computes CFM Air Quantities With Psychrometrics
Calculates from Manually Entered Data or Directly from Floor Plans Created with Drawing Board
Links with Elite Software's Energy Audit and EZDOE Energy Programs
Transfers data to the eQUEST and PowerDOE Energy Analysis Programs
Allows 30 Walls, 30 Windows, and 12 Roofs per Zone
Automates Compliance with ASHRAE Standard 62
Calculates in both Metric and English Units
Converts any project from English to Metric units and vice-versa
Allows Simultaneous Infiltration and Ventilation
Calculates Runout and Main Trunk Duct Sizes
Selects Equipment from ARI/GAMA Databases
Allows Virtually Unlimited Number of Zones
Zones May be Optionally Grouped Under VAV Boxes
Prints Numerous Color Pie Charts and Bar Graphs
Creates Spreadsheet Output File