Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
TRNSYS does not perform automatic sizing of equipment and so does not have a mechanism for using a design day weather file. Typically sizing is done by activating ideal heating and cooling in the building model and printing the zone loads for the year. The maximum heating and cooling loads for the zones can be used to determine the equipment size. Then the full HVAC system model can be created in the TRNSYS project and the zone temperatures can be checked versus the setpoints to determine if the equipment size is adequate. If you feel that using the standard weather file is not adequate for your situation, there are programs available that create extreme annual weather files that can be read by TRNSYS.
