MEBS6006 Environmental Services I

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Load Estimation (II)

1.  Calculation Methodology

• Basic considerations
• Common methods
• Transfer function method (TFM)
• CLTD/CLF and TETD/TA methods
• Emerging new methods
• Heat Balance (HB) Method
• Radiant time series (RTS) method
• Finite difference method

2.  TFM Calculation Procedures

• Sol-air temperature
• External walls and roofs; ceiling, floors & partitions
• Window glass
• Internal heat gains & infiltration
• Convert heat gain into cooling load

3.  Heating Load

• Design heat load
• Transmission losses & infiltration/ventilation

4.  Practical HVAC Design

• Typical design process
• Computer software (e.g. TRACE 600/700, Carrier E20-II, DOE-2)

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References:

• ASHRAE, 2001. ASHRAE Handbook Fundamentals 2001, Chps. 26-31, American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc., Atlanta, GA. [AV 697 A82 H01]
• Bell, A. A., 2000. HVAC: Equations, Data, and Rules of Thumb, McGraw-Hill, New York. [697.000151 B4] (eBook)
• Boushear, M. (ed.), 2001. Rules of Thumb: Guidelines for Assessing Building Services, 3rd ed., Technical Note TN 15/2001, Building Services Research and Information Association, Bracknell, Berkshire. [P 697 R935]
• Rawlings, R., 1999. Environmental Rules of Thumb, Technical Note TN 12/99, Building Services Research and Information Association, Bracknell, Berkshire, England. [P 628.0942 R25]
• Wang, S. K., Lavan, Z. and Norton, P., 2000. Air Conditioning and Refrigeration Engineering, Chp. 6, CRC Press, Boca Raton. [697.93 W246 a]

Web Links:

• Carrier E20-II and HAP (Hourly Analysis Program)  http://www.carrier-commercial.com/software/
• TRACE 700 (Trane Air Conditioning Economics)   http://www.trane.com/commercial/software/
• DOE-2  http://gundog.lbl.gov/dirsoft/d2whatis.html

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| Created: Aug 2004 | Update: 9 Oct 2004 | By: cmhui@hku.hk |