vibra's profile - activity

@Archmage， Thanks for your advice.To make the building arrive at the conditions I desired, I made a weather file with constant data, put the building in it. But I found even though I make all the weather data constant, the solar parameter was still changing according to time (High at noon Low at midnight). How can I make it constant.

Thank you for your answer. I ask this question because I want to analyze if the model is sensitive to the initial condition. (If a tiny change of the initial condition will impact the result a lot).

I want to change the initial condition of the simulation. (like the indoor temperature at the very beginning) But I found this from the documentation:

EnergyPlus “runs” the first day of the environment (starting with a set of hard-coded initial conditions) until the loads/temperature convergence tolerance values are satisfied or until it reaches “maximum number of warmup days."

Does it mean there is no chance I can modify the initial condition?

Thanks. I'm looking into the example file. I also have another question. I want to change the initial condition of the simulation. (like the indoor temperature at the very beginning) But I found this from the documentation:

EnergyPlus “runs” the first day of the environment (starting with a set of hard-coded initial conditions) until the loads/temperature convergence tolerance values are satisfied or until it reaches “maximum number of warmup days.

Does it mean there is no chance I can modify the initial condition?

Yes.I'm trying to identify the building as a black box. The HVAC system could be considered as input to the system. I need to know what exactly the value of the input is.

Thank you for your reply, Neal. This is my idea: when temperature is greater than 24C, Cooling start with constant T (15C) and constant flow rate. When temperature is lower than 20C, Heating start with constant T (27C) and constant flow rate.
I'm using energy+ for parameter optimization. So I hope the HVAC model could be as simple as possible.

I want to build a simplest hvac system in energy plus with constant air temperature and constant air flow rate. Is it possible? Can I use ZoneHVAC:IdealLoadsAirSystem to build it?