Load Profile (Very high load at Very Short time)

[Lemcarr]

Hi,

I'm doing some study, Its a Electrical Equipment Room, with very high loads for a very short period of time.
I've done it before but not with very short time, I mean the loads (190kW) only occur for 5 seconds every 3 minutes.
The profile manager in IES only manage load per minute.
Any Idea how to do it?

Thanks in Advance

[jholgate]

Just apportion the load over a single minute ie 16kW?

[Lemcarr]

if I will use a portion of 190 kW for 5 seconds, it will be 950 kJ, distributing across the 3 minutes. it will be like 5.3 kW.
..but using a portion, I will not be able to see the effect of the sudden spike in heat load, or how high the temp. rise will be.

[farahghanem]

I do not think you will be able to do this on IES (and possibly any other similar software). The calculations' precision is only in the minutes degree and not the seconds degree as far as I know.

Furthermore, I doubt a 5 second spike would significantly change the room temperature in an electric room. In any case, your best bet would be to approximate the load over a minute and set it up in the profile manager.

It would help if you explain a bit more what is the purpose of the study and what is the equipment that spikes for 5 seconds every 3 minutes.

[PCully]

Hi,

To confirm again here, 1 minute is the lowest timestep you can set for a simulation and accordingly any modelling input is the same. To look at effects and conditions below that may need a more specialist application as Apache simulation is more concerned with study of large spaces over longer periods of time and dynamic effects that will go on at a more Macro level (although this kind of resolution is getting smaller all the time of course)

Phil