[esp-r] Re: Climate smeared out

[Jon Hand]

There is an option in ESP-r to alter the timing assumptions in the
solar radiation data. Look for the half-hour option.  That might
alter the performance a few hours.

And you can use sub-hourly climate data via the temporal data
facility.  For example, if you had 15 minute data then the
averaging would be over a different time-scale.

And what happens if you do not ask for averaging of the simulation
data and save data at higher frequencies?

Please clarify whether the data below is from a simulation actually
at one time step per hour saved at one time step per hour  OR is
is 15 minute timesteps saved onced per hour?

Regards, Jon Hand

________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Bakker, L.G. (Leo) [leo.bakker at tno.nl]
Sent: 10 March 2010 10:26
To: esp-r at lists.strath.ac.uk
Subject: [esp-r]  Climate smeared out

Dear all,

When I look at the climate data from the clm76 with the clm module I get:
Hr    dr.n.dad  df.nrad
 8    0.     0.
 9    0.    31.
10  341.    67.
11  513.    75.
12  568.    77.
13  151.    83.
14   58.    67.
15    0.    28.
16    0.     0.

when I look at the same data with the res module climate I get:

# Timestep performance metrics.
# Lib: blokje.res: Results for blokje
# Period: Sun-01-Jan at 00h30(1967) to Sun-31-Dec at 23h30(1967) : sim at 60m, output at 60m
Time  Directnorsolar(W/m^2) Diffusesolar(W/m^2)
06h30       0.00       0.00
07h30       0.00       7.75
08h30      85.25      32.25
09h30     298.75      60.00
10h30     483.75      73.50
11h30     450.00      78.00
12h30     232.00      77.50
13h30      66.75      61.25
14h30      14.50      30.75
15h30       0.00       7.00
16h30       0.00       0.00


It seems that the data is averaged over time for some reason.

The problem I have with this is that I am studying the effects of controlled shading and averaging data over the hours seem to effect the results.

There is for instance one particular day where only one hour has direct radiation of 100 W/m2 which is averaged around that hour (25 50 and 25 again).

If this would be 600W/m2 and it would be averaged to 150, 300 and 150 W/m2 and the solar shading would be set to close above levels of 350W/m2 it would not be closed due to the averaging effects...

This worries me.

I have the following questions:

Is it me doing something wrong?
How can I stop this averaging?
What are alternatives?

Thanks in advance,

Leo Bakker
TNO Buildings and Construction research













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