Cooling Load Calculation Rts Program

Apr 13, 2015 The general procedure for calculating cooling load for each load component (lights, people, walls, roofs, windows, appliances, etc.) with RTS (ASHRAE) is as follows: Calculate 24 h profile of component heat gains for design day (for conduction, first account for conduction time delay by applying conduction time series). Split heat gains into radiant and convective parts. Apply appropriate. They have been updated for use in the examples found in Chapter 18, Nonresidential Cooling and Heating Load Calculations, of the 2017 ASHRAE Handbook-Fundamentals.These spreadsheets allow the user to perform RTS cooling load calculations for lights, people, equipment, walls/roofs, and fenestration components.

Cooling Load Spreadsheet

Cooling Load Spreadsheet

I'd like to double-check our landlord. We're having extensive renovations done to our office, and we've asked that they take a closer look at the cooling. They've come back with a plan that looks pretty similar to what was there, which we felt was inadequate during Georgia summers. I think their AC guy was just looking at the square footage.
I'm an ME, but not in HVAC. I'd love to get a pointer to a spreadsheet or some demo software that would help us put our minds at ease that we won't be cooking next summer.
The rough details for those of you who love to solve problems:
Location: Atlanta, GA
Roof: 48x58ft 2' gypsum with membrane
SW Wall: 48X14ft Brick over block, interior finished
SW Windows: ~40X8ft 1/4' glass with 50% darkening film
NW Wall: 58X14ft block shared with conditioned space, interior finished
NE Wall: 48X14ft Brick over block, interior finished
SE Wall: 48X14ft Brick over block, interior finished
SE Windows: 25x8ft 1/4' glass with 50% darkening film 80% shaded.
Floor: 48x58ft slab on grade.
Occupants: about 20 people and computers
We want to make sure enough cooling gets to the SW windows. They've got 3 tons going over in their new plan, and another 5 ton unit for the rest of the space. Previously we had 2.5 tons near the windows, and it felt inadequate.
I'm not trying to get someone to do work for free, but I did want to provide all the details. A pointer to a good web reference/spreadsheet/demo would be great.

The general procedure for calculating cooling load for each load component (lights, people, walls, roofs, windows, appliances, etc.) with RTS (ASHRAE) is as follows:

Cooling Load Calculation Rts Program 2

  1. Calculate 24 h profile of component heat gains for design day (for conduction, first account for conduction time delay by applying conduction time series).
  2. Split heat gains into radiant and convective parts.
  3. Apply appropriate radiant time series to radiant part of heat gains to account for time delay in conversion to cooling load.
  4. Sum convective part of heat gain and delayed radiant part of heat gain to determine cooling load for each hour for each cooling load component.

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Cooling Load Calculation Rts Program

After calculating cooling loads for each component for each hour, the engine sums those to determine the total cooling load for each hour and selects the hour with the peak load for design of the air-conditioning system. The engine repeats this process for multiple design months to determine the month when the peak load occurs.

Cooling Load Calculation Rts Programming

Heat gain through exterior opaque surfaces is derived from the same elements of solar radiation and thermal gradient as that for fenestration areas. It differs primarily as a function of the mass and nature of the wall or roof construction, because those elements affect the rate of conductive heat.