Re: [EnergyPlus_Support] Extremely high user design load for heating for HVAC system 3

[Qianmin Zhang <zqianmin@xxxxxxxxx>]

yea, I found out the user design value are closed to my input.

Like what I said, it is a finished design project, so I will assume they selected the correct equipment based on their calculation. But from energyplus hvac summary report, the calculated design air flow is about 400cfm, which is too small compared to the equipment of 1800cfm for a 800ft^2 class room. Above is for zone cooling. For zone heating, the calculated design air flow are less than 70cfm for each classroom zone.

On Fri, Jul 8, 2011 at 12:14 PM, Jason Kirkpatrick <jason.alan.kirkpatrick@xxxxxxxxx> wrote:

 

The user design airflow is the calculated design airflow x the sizing factor

On Fri, Jul 8, 2011 at 2:15 PM, Qianmin Zhang <zqianmin@xxxxxxxxx> wrote:

 

Hello All,

First I want some help to better understand the result. Under HVAC Summary, for both heating, cooling, and airflow rate, there are two objects, one is calculated design, one is user design. I'm not that understand the difference between these two. Is there any relation between these two? Which document should I read to get know these things?

From the report summary, user design load for heating is much too high from my simulation. I used HVAC template, and I don't think I make any special change in my.idf file regarding the system. The weather data I used is Sacramento, CA. I found "zone/sys sensible heating rate" is really large. Could you take a look at my .idf and tell me the problem? It's a simply model. Thanks a lot.

Qianmin

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