If the ground temperature is lower than the air inlet temperature in the earth tube , it is not possible to heat the air and therefore there is no heating rate. Check if your ground temperatures are correct . If so, you will need to couple an air heating system.
Regards,
Alberto
----- nasim mirian <nasim_mirian@xxxxxxxxx> escreveu: > Hi all, > > I need some help in modeling the Earth tube system in EnergyPlus, I've tried to use the example file but the results are not reasonable, > for example, the earth tube heating rate equals to zero all the time. > should I couple the earth tube with other HVAC system or not? > > Thanks, > > ------------------------------------ > > Primary EnergyPlus support is found at: > http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx > > The primary EnergyPlus web site is found at: > http://www.energyplus.gov > > The group web site is: > http://groups.yahoo.com/group/EnergyPlus_Support/ > > Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files. > > EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button. > Yahoo! Groups Links > ><*> To visit your group on the web, go to: > http://groups.yahoo.com/group/EnergyPlus_Support/ > ><*> Your email settings: > Individual Email | Traditional > ><*> To change settings online go to: > http://groups.yahoo.com/group/EnergyPlus_Support/join > (Yahoo! ID required) > ><*> To change settings via email: > EnergyPlus_Support-digest@xxxxxxxxxxxxxxx > EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx > ><*> To unsubscribe from this group, send an email to: > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx > ><*> Your use of Yahoo! Groups is subject to: > http://docs.yahoo.com/info/terms/ >