[esp-r] operation file - infiltration scheme with default interpolation function?

[Tobias Zitzmann]

Dear users,

I used an operation file to define the internal gains and infiltration 
flow rates for a simple room in winter case. Gains and infiltration rate 
are 250W and 0.5h-1 between 7am-6pm; outside this period the values are 
20W and 0.1h-1. No operation control has been set up. The simulation 
time step is 5min.

As I have expected, the simulation result shows a sudden raise of 
internal gains at 7am and a sudden decrease at 6pm. However, for the 
infiltration rate the solver seems to interpolate linearly between 
7am-8am and between 6pm-7pm.

Thus, the difference between the internal gain scheme without 
interpolation and the infiltration scheme with interpolation leads to 
significant 'room temperature humps' after 7am and 6pm.

Is this linear interpolation procedure the default setting for the 
infiltration scheme in ESP-r? What is the reason for this and is there a 
way to switch it off in the operation file? The only way I was able to 
get rid of the interpolation so far was to use a 5min time step temporal 
file.

Any comments are welcome,

Tobias

-- 
Dr. Tobias Zitzmann
Project Manager
Dept. Thermal Systems and Buildings
Fraunhofer-Institut für Solare Energiesysteme ISE
Heidenhofstraße 2, 79110 Freiburg, Germany
Phone: +49 (0) 7 61/ 45 88-55 82  Fax: +49 (0) 7 61/ 45 88-95 82
tobias.zitzmann(at)ise.fraunhofer.de
http://www.ise.fraunhofer.de