[TRNSYS-users] single Room simulation

[David Bradley]

Sebastian,
  I would think that all you would need would be Type56 and Type109 
(plus Type33 and Type69 I think). You can just set the cooling 
temperature in your zones to 24.2C and allow the cooling equipment to 
have unlimited power, then take a look at the maximum cooling load that 
was required. That should give you the required system size. Keep in 
mind three things:

1. Type109 reads a typical (average) weather year file - not an extreme 
one and typically (right or wrong) system sizing is done based on a 
worst-case scenario, not on an average year.

2. If you plan for your lab to have temperature setups and setbacks, 
your max cooling load will be enormous because technically the load is 
infinite when your set point temperature comes back from its set up 
condition. I would recommend using a constant setpoint in order to find 
your system size.

3. The Type56 output QSENS is sensible cooling only! In order to get a 
latent component, you must also impose an RH setpoint on the zone and 
look at the QLAT output from Type56. This isn't ideal because often the 
latent cooling is an effect of the sensible cooling (not something that 
can be controlled separately). We wrote a component based on some curve 
fits that calculate the amount of latent cooling that a "cooling coil 
type" of cooling device can do based on zone temperature and ambient wet 
bulb (If I am remembering correctly). Its latent cooling ability turns 
into a negative moisture gain on the space, which is fed back to Type56. 
The component will be part of the TESSLibs 3.0 but for the moment is an 
individual component.
Kind regards,
 David


Sebastian Schlott wrote:
> My Problem,
>
> I have 2 rooms, used as a lab.
>
> In this rooms there is a thermal load of 15kw which has to be cooled away.
>
> The ambition is the simulation of the room temperature. 
> Target: 24°C +- 0,2 °C
> Question: Is the installed system strong enough, which systempower do I need?
>
> At the moment the installed system has not the ability to cool 15 kw away.
>
> is it enough to use the build (type56) and weather data(Type109) to simulate this situation?
>
> Mit freundlichem Gruß
>
> i. A. Sebastian Schlott
>
>
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