Cooling Load Calculation Rts Program
INTRODUCTION The radiant time series (RTS) method is a new method, derived directly fi'om the heat balance method, for performing design cooling load calculations.
- 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.
- Ombines a full-featured design load calculation program with a simplified user interface. Perfect for engineers and contractors who need to generate loads quickly. Provides all of the sizing and load information needed to design HVAC systems and select air conditioning equipment.
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 radiant time series to radiant part of heat gains to account for time delay in conversion to cooling load.
- 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.
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.
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.
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
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.
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Cooling Load Calculation Rts Program 2
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