Demonstration of TRNSYS use in building simulations

 TRNSYS is a modular transient system simulation program that has been commercially available since  1975. The primary use of TRNSYS is to model  thermal energy systems. Although TRNSYS was  originally developed for use with solar thermal  applications, an effort has been made to broaden the  scope of TRNSYS by increasing the number of general HVAC components and improving the  usability of the building model. Some of the more  recently available HVAC models include the ASHRAE  Primary and Secondary Toolkits and FIVACSIM+  components. Additionally, an interfáce with D0E2 was  developed allowing TRNSYS to read, D0E2  generated, building load files.  

Mie modeling of buildings can, be done with varying degrees of complexity. A simple single conductance  method is the simpliest model. A detailed single zone  component is also available. Finally, a multizone  model is available that also calculates the interaction  between zones.