Performs Complete Psychrometric Analysis.Creates Spreadsheet File with Calculated Results.Provides Overall Building Envelope Report.Automates Compliance with ASHRAE Standard 62.Calculates Runout and Main Trunk Duct Sizes.Calculates Both Heating & Cooling CFM Requirements.Calculates Peak Heating and Cooling Loads.Rhvac - Residential HVAC Loads and Duct Sizes All you have to do to switch between the two methods is to enter equivalent Master Data definitions for roofs, walls and glass and then change the Cooling Calculation Method input to the other method. You can actually switch back and forth between RTS and CLTD for any project. The CLTD method, on the other hand, uses exact table values from the Handbook where possible, which means that you can verify the results by hand. That means, for example, that the program gives proper consideration to the effect of an external shading device that shades a window in the morning in a room that peaks in the afternoon. The RTS method is especially accurate because it calculates the delayed effect of radiant heat gains during each of the past 24 hours in determining the current cooling load. The RTS method is described in the latest edition of the ASHRAE Handbook of Fundamentals, while the CLTD method is from earlier editions of the Handbook. 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.Ĭhvac performs cooling calculations using either the CLTD method or the new RTS (Radiant Time Series) method. Comprehensive reports list the general project data, detailed room 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. There is also provision for editing the weather data as well as adding data for other cities. In addition, it can look up outdoor design weather data for over 2000 cities located around the world.

Chvac automatically looks up all cooling load and correction factors necessary for computing loads. The program allows an unlimited number of rooms which can be grouped into as many as 100 air handling systems. The cooling loads can be calculated with either the CLTD method or the new RTS (Radiant Time Series) method. Chvac quickly and accurately calculates the maximum heating and cooling loads for commercial buildings.

Cooling load calculation rts program