CEA Energy Modeling & Simulation Tools 3

Question 1

Which DOE-2 simulation engine component handles the calculation of hourly heating and cooling loads?

Accepted Answer

LOADS

Answer

The LOADS module in DOE-2 calculates space heating and cooling loads using the weighting factor method before passing results to the SYSTEMS module.

Question 2

In TRACE 700, what does the 'Design Day' cooling calculation determine?

Accepted Answer

Peak cooling load used to size coils and air handlers

Answer

TRACE 700's Design Day cooling calculation finds the peak load under worst-case summer conditions to properly size HVAC components.

Question 3

What is the purpose of 'parametric analysis' in energy modeling software?

Accepted Answer

To systematically vary input parameters and compare resulting energy impacts

Answer

Parametric analysis runs multiple simulations with varied inputs (e.g., insulation levels, window types) to identify which measures have the greatest energy impact.

Question 4

In EnergyPlus, what object type is used to model a variable air volume (VAV) terminal unit?

Accepted Answer

AirTerminal:SingleDuct:VAV:Reheat

Answer

The AirTerminal:SingleDuct:VAV:Reheat object models a VAV box with reheat coil that varies airflow based on zone demand.

Question 5

Which metric best describes how closely a simulation model matches measured building energy use?

Accepted Answer

Coefficient of Variation of Root Mean Square Error (CV-RMSE)

Answer

CV-RMSE normalizes the root mean square error by the mean measured value, providing a percentage-based accuracy metric for model calibration.

(CEA) Certified Energy Analyst Practice Test

(CEA) Certified Energy Analyst Practice Test

CEA Energy Modeling & Simulation Tools 3