ABSTRACT
In the late 1960s, under the sponsorship of the Department of Housing and Urban Development, Tamami Kusuda began to develop a computer program to help architects and engineers predict the thermal performance of a building. The computer program was named the National Bureau of Standards Load Determination (NBSLD) program. It combines algorithms for transient conduction in the building structure, solar heat gains and radiant transfer, and convection between building surfaces and the room air to allow the prediction of temperatures and heating and cooling loads under dynamic conditions. NBSLD was developed with the cooperation of ASHRAE's Task Group on Energy Requirements, in particular the Subcommittee on Heating and Cooling Load Calculations which Kusuda chaired. The members of the subcommittee shared their specialized work and computer algorithms. Kusuda developed and implemented the NBSLD framework for putting the algorithms together, and, together with NBS staff, filled in the missing components of the complete model.
