Monday, July 29, 2019

Comparison of Building Energy Modeling Programs: HVAC Systems (Free PDF)

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This technical report summarizes methodologies, processes, and main assumptions of three building energy modeling programs (BEMPs) for HVAC calculations: EnergyPlus, DeST, and DOE-2.1E. This is a joint effort between Lawrence Berkeley National Laboratory, USA and Tsinghua University, China. It is part of a research project under the five-year collaborative research program of the U.S.-China Clean Energy Research Center for Building Energy Efficiency (CERC-BEE). Energy Foundation, an industrial partner of the CERC-BEE, is the co-sponsor of this work.

The fact that large discrepancies exist in simulated results when different BEMPs are used to model the same building has caused increasing concern. Immediate research is needed to identify main elements that contribute towards the discrepancies of simulation results. This will help users get an in-depth understanding of BEMPs and how to improve accuracy of simulation results. This will also help build a foundation for building energy code development and energy labeling programs as they rely on building energy simulations. In order to achieve these objectives, it is essential to identify and understand the differences between widely used BEMPs and the way these differences influence simulation results. This will involve a detailed comparison of these BEMPs from key user inputs, modeling methods, and source code to results. The goal of this BEMP comparison work is to develop new methods and processes to perform scientific comparisons, and to summarize a list of advantages and disadvantages of the three BEMPs, based on an in-depth understanding of their modeling capacities, mathematical algorithms, assumptions and limitations.

Executive summary
1. Introduction
2. Overview of the three programs
3. HVAC Component Calculation Methods
4. Control strategies
5. Comparison of HVAC system simulations
6. Case study
7. Conclusions

Author Details
"Xin Zhou1"

"Tianzhen Hong"

"Da Yan1"

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