Re: [TRNSYS-users] TRNSYS-users Digest, Vol 76, Issue 48

[David BRADLEY <d.bradley@tess-inc.com>]

Jiang,
The first method is the correct one. The heating and cooling types that are built into Type56 are idealized and are intended to calculate the energy required to keep the space at a given temperature. The resulting loads give you an idea of the size of equipment needed to maintain those set points. By defining a thermostat and a delivery device you are able to calculate the actual energy required (accounting for the non-idealities of the equipment, the controls, and the delivery). Make sure that when you define your equipment and use the ventilation type for delivery you also reduce your simulation timestep to something reasonable for making control decisions (1 minute or 5 minutes probably).
best,
 David

On 4/13/2011 13:27, Jay Zhu wrote:

Dear All:

I have a question about the connection between the external heating and cooling source, such as water source heat pump, air source heat pump , and the building type 56, i tried two methods to simulate .
1, use the ventilation, supplied air flow ,air T, Humidity
2, use the heating and cooling type, supplied cooling power and heating power.
From the manual , either way should work, However, the results for the two cases have a big difference in my simulation.

Does anyone know the reasons or have some relative experience?   Thank you in advance！

Best

Jiang

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