[TRNSYS-users] problem about type 121b auxiliary heating

[Jeff Thornton]

<Sorry to make you misunderstanding. i intend to make the heating not
working, then i set the heating point as a low level instead of a normal
20 C. because i wanna see the comparison and differences between the case
with type 121 and without type 121, as i said i made the heating not
running, So i meaned the results for the two cases should be the same, the
type 121 which is added for heating doesnt running.   However, cooling
consumption of the case with type 121(but i set it not work at all ) is
lower than the case wihout it, and the plot for the room temperature is
also different. >

The room temperature plot shouldn't be the same.  In one case you are
keeping the building at a minimum of 20 C and cooling the building when it
hits the cooling setpoint temperature.  In the second case, the building
can fall well below 20 C and must come up much farther before cooling
comes on.  I'm guessing that there are quite a few days in the shoulder
seasons where the cooling is on with a heating setpoint of 20 C and not on
at all if the building wasn't being heated.  Imagine your building is
heated on a cold night to 20 C and the next day is warm.  The internal
gains and passive solar gains could raise the building temperature from 20
C to 25 C and the cooling system would turn on.  Now imagine that same
cold night without heating.  The zone could fall down to 5 C and the next
days passive solar and internal gains may raise it all the way up to 22
but cooling remains off.

Jeff


Jeff Thornton
President - TESS, LLC

22 North Carroll Street - Suite 370
Madison WI 53703 USA

Phone: 608-274-2577
Fax: 608-278-1475
E-mail: thornton at tess-inc.com
Web: www.tess-inc.com