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HVAC ResLoad-J Help THIS IS THE FIRST ACCA-APPROVED MOBILE HVAC MANUAL J (Version 8) LOAD CALC NATIVE APP FOR THE APPLE IPAD. The HVAC ResLoad-J app performs heating and cooling block and room-by-room load calculations based upon industry standard calculation methods (ACCA Manual J8). Some jurisdictions require “ACCA Approved”software whenever a heating or cooling load is performed for a residential heating and cooling load. This is due to the quality of ACCA’s body of research into the methodologies for load calculations, and the quality of their certification body. This HVAC ResLoad-J app is ACCA-approved and can be used for the purposes of compliance in jurisdictions where the law requires ACCA approval for load calculation software.

HVAC ResLoad-J - Part 4 April 3, 2014 The above will display about 11 minutes of the total 56 minutes of the video in your browser. If you wish to view the entire thing, download it to your desktop or DropBox by clicking the 'Download' button that appears above the video. If you download it to your desktop, just double-click it and it will open your default video software. If you download it to your DropBox account, you will be able to view the entire video through the browser. Training Webinar for HVAC ResLoad-J - Part 1 October 24, 2013 Table of Contents.

Heat load calculations – heat gain for air conditioner sizing Cooling Heat load calculations spacer Search this site: Using: All Words Any Words Phrase W. Tombling Ltd. Wembley House Dozens Bank West Pinchbeck Spalding Lincolnshire PE11 3ND U.K.

Telephone +44 (0) 1775 640 049 Facsimile +44 (0) 1775 640 050 Email You are here:- > > > determining the size of air conditioner required Heat load or heat gain A building or room gains heat from many sources. Inside occupants, computers, copiers, machinery, and lighting all produce heat.

Warm air from outside enters through open doors and windows, or as ‘leakage’ though the structure. However the biggest source of heat is solar radiation from the sun, beating down on the roof and walls, and pouring through the windows, heating internal surfaces. The sum of all these heat sources is know as the heat gain (or heat load) of the building, and is expressed either in BTU (British Thermal Units) or Kw (Kilowatts). For an air conditioner to cool a room or building its output must be greater than the heat gain.

It is important before purchasing an air conditioner that a heat load calculation is performed to ensure it is big enough for the intended application. Heat load calculations There are several different methods of calculating the heat load for a given area: Quick calculation for offices For offices with average insulation and lighting, 2/3 occupants and 3/4 personal computers and a photocopier, the following calculations will suffice: Heat load (BTU) = Length (ft.) x Width (ft.) x Height (ft.) x 4 Heat load (BTU) = Length (m) x Width (m) x Height (m) x 141 For every additional occupant add 500 BTU. If there are any additional significant sources of heat, for instance floor to ceiling south facing windows, or equipment that produces lots of heat, the above method will underestimate the heat load. In which case the following method should be used instead. A more accurate heat load calculation for any type of room or building The heat gain of a room or building depends on: The size of the area being cooled The size and position of windows, and whether they have shading The number of occupants Heat generated by equipment and machinery Heat generated by lighting By calculating the heat gain from each individual item and adding them together, an accurate heat load figure can be determined.

Step One Calculate the area in square feet of the space to be cooled, and multiply by 31.25 Area BTU = length (ft.) x width (ft.) x 31.25 Step Two Calculate the heat gain through the windows. If the windows don’t have shading multiply the result by 1.4 North window BTU = Area of North facing windows (m. Sq.) x 164 If no shading, North window BTU = North window BTU x 1.4 South window BTU = Area of South facing windows (m. Sq.) x 868 If no shading, South window BTU = South window BTU x 1.4 Add the results together. Total window BTU = North window + South window Step Three Calculate the heat generated by occupants, allow 600 BTU per person. Occupant BTU = number of people x 600 Step Four Calculate the heat generated by each item of machinery - copiers, computers, ovens etc.