MEBS6006 Environmental Services I

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Energy Calculations

1.  Background

• From load estimation to energy calculations
• Tasks at different design stages

2.  Calculation Methodology

• Basic considerations
• Common methods:
• TFM, CLTD/CLF and TETD/TA methods
• Heat balance and radiant time series methods

3.  Transfer Function Method

• Basic concepts and components
• Sol-air temperature
• Calculation procedures

4.  Energy Calculation Methods

• Steady-state methods: degree-day method, variable base degree-day method, bin and modified bin methods
• Dynamic simulation methods

5.  Building Energy Simulation

• General approach
• Four major elements
• Information flow
• Examples of building energy simulation tools
• Energy-10  http://www.nrel.gov/buildings/energy10.html
• DOE-2 (VisualDOE 4.0) http://www.archenergy.com/products/visualdoe/

[Download PowerPoint file in PDF format]

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References:

• ASHRAE, 2009. ASHRAE Handbook Fundamentals 2009, Chapter 19 - Energy Estimating and Modeling Methods, American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc., Atlanta, GA. [ebook via Knovel]
• Hui, S. C. M., 1998. Simulation based design tools for energy efficient buildings in Hong Kong, Hong Kong Papers in Design and Development, Vol. 1, 1998, pp. 40-46, Department of Architecture, University of Hong Kong. [HTML]
• Kreider, J. F, (ed.), 2001. Handbook of Heating, Ventilation, and Air Conditioning, Chapter 6: HVAC Design Calculations, Section 6.2: Simulation and Modeling -- Building Energy Consumption, CRC Press, Boca Raton, Florida. [ebook via ENGnetBASE]

Web Links:

• Energy-10  http://www.nrel.gov/buildings/energy10.html
• DOE-2 (VisualDOE 4.1) http://www.archenergy.com/products/visualdoe/

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| Created: Aug 2004 | Update: 13 Sep 2009 | By: cmhui@hku.hk |