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. Heat gain through exterior opaque surfaces is derived from the same elements of solar radiation and thermal gradient as that for fenestration areas. The engine repeats this process for multiple design months to determine the month when the peak load occurs. 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.Īfter 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.Apply appropriate radiant time series to radiant part of heat gains to account for time delay in conversion to cooling load.

Split heat gains into radiant and convective parts.Calculate 24 h profile of component heat gains for design day (for conduction, first account for conduction time delay by applying conduction time series).Therefore we are developing Heat load Calculator software based on the RTS method for Indian conditions.The general procedure for calculating cooling load for each load component (lights, people, walls, roofs, windows, appliances, etc.) with RTS (ASHRAE) is as follows: Although simple in concept, RTS involves too many calculations for practical use as a manual method, although it can easily be implemented in a simple computerized spreadsheet. The RTS method is suitable for peak design load calculations, but not for annual energy simulations because of its inherent limiting assumptions. These characteristics of the RTS method make it easier to apply engineering judgment during cooling load calculation. In addition, it is desirable for the user to be able to inspect and compare the coefficients for different construction and zone types in a form showing their relative effect on the result. This method was developed to offer an approach that is rigorous, yet does not require iterative calculations, and that quantifies each component’s contribution to the total cooling load.

It effectively replaces all other simplified (non-heat-balance) methods, such as the transfer function method (TFM), the cooling load temperature difference/cooling load factor (CLTD/CLF) method, and the total equivalent temperature difference/time averaging (TETD/TA) method. The radiant time series (RTS) method is a simplified method for performing design cooling load calculations that are derived from the heat balance (HB) method. Radiant time series method for Indian condition

Cooling load calculation rts program