This method was developed as a simpler calculation alternative to difficult and unwieldy calculation methods such as the transfer function method and the Sol-air temperature method. Research completed in revealed some factors which were not accounted for in the original publication of the method; these findings were a result of the ASHRAE research project Additionally, a weighting factor database was generated to help correct for previous inaccuracies. Additional research in Thermal radiation and appliance heat gain with respect to CLTD data was also completed shortly after the original publication of the method. The data is divided into many different sections based on many different variables.
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Split heat gains into radiant and convective parts using 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. Analytically, for each step: 1i.
Interior surfaces heat gain calculation Whenever a conditioned space is adjacent to a space with a different temperature, heat transfer through the separating physical section must be considered.
Floors heat gain calculation For floors directly in contact with the ground or over an underground basement that is neither ventilated nor conditioned, sensible heat transfer may be neglected for cooling load estimates because usually there is a heat loss rather than a gain. Internal heat gains calculation 1v. People The occupants heat gains are distinguished in sensible and latent heat gains.
Appliances The appliances loads are distinguished in sensible load and latent load. Ventilation and Infiltration Air-conditioning design often requires the calculation of the sensible and latent heat gain. Separation of heat gains in radiant and convective fractions The cooling load for each load component lights, people, walls, roofs, windows, appliances etc.
The following table contains recommendations for splitting each of the heat gain components into convective and radiant portions: Radiative Convective fraction fraction 0. In the calculation sheets the results per space are tabulated in the following groups: 1. In a similar way, the system calculation sheets are presented.
In these, the loads of the corresponding to each system spaces are grouped and resolved into the different causes. Ventilation loads for each system are also given. Finally, the shadowing coefficients are presented in separate sheets.
Power Total W 4-lamp pendant 0. Related Papers. By Zaw Moe Khine. By Sai Naung. By ardy suryo prabowo. By aled orn. Download pdf. Remember me on this computer. Enter the email address you signed up with and we'll email you a reset link.
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GRP 158 PART 3
Cooling load temperature difference calculation method