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Re: [TRNSYS-users] question about the fan

Jason,
 You are not the only person to have run into this quirk. It is not intuitive but when you change the units of an input (by selecting Pa instead of atm in your case), TRNSYS does not insert an automatic unit conversion into your input file. The fan model is still expecting its pressure input in atmospheres and the weather data component is still providing pressure in pascals. What you need to do is to insert an equation into your input file to convert from Pa to atm. Changing units by selecting something from a pulldown menu in the Studio has an effect only at the interface level - when the interface writes the input file, it makes all the conversions back again. It is safe to change the units of parameters and it is safe to change the units of unconnected inputs.
Kind regards,
 David



jason chan wrote:
Hi,

I do not know why TRNSYS give me error when I made the connection between the atmospheric pressure and the inlet air pressure for the fan (type 662-2). Here I attach the component in this email. Thank you



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