Carbon Emissions of Chiller Systems in Hong Kong Hotels under Climate Change
Building energy simulation is a common technique to forecast future energy use and develop strategies for meeting carbon reduction targets. The purpose of this study is to analyze the trend of electricity use and carbon emissions of chiller systems—the most energy intensive type of system—using building energy simulation for hotels in subtropical zones under climate change. Based on a typical meteorological year weather file for subtropical Hong Kong, weather data were forecasted for climate change scenarios in 2020, 2050 and 2080. The building simulation program EnergyPlus was used to model a reference hotel with two typical chiller system designs. Simulation results show that a system capacity extension by up to 5% could be considered to satisfy the increasing cooling demand for a 15-year operating span. Various strategies have been discussed for chiller systems to reduce carbon emissions by the demand side. A rigorous carbon intensity target by power companies should be in place to reduce the increasing carbon emissions by hotels in subtropical zones.
ASHRAE (2010), “ASHRAE Standard 90.1—Energy standard for buildings except lowrise
residential buildings,” Atlanta, GA: American Society of Heating, Refrigerating
and Air conditioning Engineers, Inc.
Belcher, S.E., Hacker, J.N. and Powell, D.S. (2005), “Constructing design weather data for
future climates,” Building Services Engineering Research and Technology, Vol. 26 No.
, pp. 49–61.
Building Environmental Assessment Method (BEAM) Society Ltd. (2012), “BEAM Plus
existing buildings version 1.2,” available at: http://www.beamsociety.org.hk/files/download/download-20120629115231.pdf (access 24 October 2012).
Building Research Establishment Ltd. (2012), “BREEAM—the world’s leading design
and assessment method for sustainable buildings,” available at: http://www.
breeam.org/(access 24 October 2012).
Chan, A.L.S., Chow, T.T., Fong, K.F. and Lin, Z. (2006), “Generation of a Typical Meteorological
Year for Hong Kong,” Energy Conversion and Management, Vol. 83, pp.
Chan, K. T., Lee, R. H.K. and Burnett, J. (2003), “Maintenance practices and energy performance
of hotel buildings,” Strategic Planning for Energy and the Environment,
Vol. 23 No. 1, pp. 6–28.
Chan, W.W. (2005), “Predicting and saving the consumption of electricity in sub-tropical
hotels,” International Journal of Contemporary Hospitality Management, Vol. 17 No. 3,
Climate Change World Weather File Generator for World-Wide Weather Data—CCWorldWeatherGen
(2012), available at: http://www.serg.soton.ac.uk/ccworldweathergen/(
accessed 29 August 2012).
CLP Holdings Ltd. (2012), “CLP targets to reduce carbon intensity by 75% by 2050,”
available at: https://www.clpgroup.com//ourcompany/news/pages/07122007.
aspx?lang=en (accessed 29 August 2012).
Crawley, D.B., Lawrie, L.K., Winkelmann, F.C., Buhl, W.F., Huang, Y.J., Pedersen, C.O.,
Strand, R.K., Liesen, R.J., Fisher D.E., Witte, M.J. and Glazer, J. (2001), “EnergyPlus:
creating a new-generation building energy simulation program,” Energy and
Buildings, Vol. 33, pp. 319–331.
Crowther, H. and Furlong, J. (2004), “Optimizing chillers and towers,” ASHRAE Journal,
Vol. 46(7), pp. 34–40.
Electrical and Mechanical Services Department (EMSD) (2006), “Fresh water cooling
towers scheme for air conditioning systems,” available at: http://www.emsd.gov.
hk/emsd/eng/pee/psfwct.shtml (accessed 23 October 2012).
Electrical and Mechanical Services Department (EMSD) (2007), “Performance-based
building energy code,” available at: http://www.emsd.gov.hk/emsd/eng/pee/
eersb.shtml (accessed 29 August 2012).
EnergyPlus energy simulation software (2012), available at: http://apps1.eere.energy.
gov/buildings/energyplus/energyplus_about.cfm. (accessed 29 August 2012).
Fumo, N, Mago, P. and Luck, R. (2010), “Methodology to estimate building energy consumption
using EnergyPlus Benchmark Models,” Energy and Buildings, Vol. 42, pp.
Guan, L. (2009), “Preparation of future weather data to study the impact of climate
change on buildings,” Building and Environment, Vol. 44, pp. 793–800.
Gugliermetti, F., Passerini, G. and Bisegna, F. (2004), “Climate models for the assessment
of office buildings energy performance,” Building and Environment, Vol. 39, pp.
Hartman, T. (2001), “All-variable speed centrifugal chiller plants,” ASHRAE Journal, Vol.
, pp. 43–52.
Hong, T. and Jiang, Y. (1995), “Stochastic weather model for building HVAC systems,”
Building and Environment, Vol. 30, pp. 521–532.
Huang, J. (2006), “The impact of climate change on the energy use of the US residential
and commercial building sectors,” LBNL Report 60754. Berkeley, CA: Lawrence
Berkeley National Laboratory.
International Organization for Standardization (ISO) (2011), “ISO 50001:2011—Energy
management systems—requirements with guidance for use,” ISO Press.
Joudi, K.A. and Namik, H.N.H. (2003), “Component matching of a simple vapor com
pression refrigeration system,” Energy Conversion & Management, Vol. 44, pp.
Kharseh, M. and Altorkmany, L. (2012), “How global warming and building envelope
will change buildings energy use in central Europe,” Applied Energy, Vol. 97, pp.
Lam, K.S. (2007), “Greenhouse gas emission and its control in Hong Kong--submitted to
Legislative Council-panel on environmental affairs,” available at: http://www.
Lam, T.N.T., Wan, K.K.W., Wong, S.L. and Lam, J.C. (2010), “Impact of climate change
on commercial sector air conditioning energy consumption in subtropical Hong
Kong,” Applied Energy, Vol. 87, pp. 2321–2327.
Manske, K.A., Reindl, D.T. and Klein, S.A. (2001), “Evaporative condenser control in
industrial refrigeration systems,” International Journal of Refrigeration, Vol. 24, pp.
Saaty, T.L. (1996), “Decision making with dependence and feedback: The analytic network
process,” RWS Publications, Pittsburgh, PA.
Teng, C.C., Horng, J.S., Hu, M.L., Chien, L.H. and Shen, Y.C. (2012), “Developing energy
conservation and carbon reduction indicators for the hotel industry in Taiwan,”
International Journal of Hospitality Management, Vol. 31, pp. 199–208.
Typical meteorological year (TMY) weather file for Hong Kong (2012), available at:
region=2_asia_wmo_region_2/country=CHN/cname=China (accessed 29 August
U.S. Green Building Council (2012), “Leadership in Energy and Environmental Design
(LEED) is an internationally recognized green building program,” available at:
https://new.usgbc.org/leed (accessed 24 October 2012).
Wan, K.K.W., Li, D.H.W., Liu, D. and Lam, J.C. (2011), “Future trends of building heating
and cooling loads and energy consumption in different climates,” Building and Environment,
Vol. 46, pp. 223–234.
Wong, S.L., Wan, K.K.W., Li, D.H.W. and Lam, J.C. (2012), “Generation of typical weather
years with identified standard skies for Hong Kong,” Building and Environment,
Vol. 56, pp. 321–328.
Yang, J., Chan, K.T., Wu, X.S., Yang, X.F., Zhang, H.Y. (2012), “Performance enhancement
of air-cooled chillers with water mist: Experimental and analytical investigation,”
Applied Thermal Engineering, Vol. 40, pp. 114–120.
Yik, F.W.H., Burnett, J. and Prescott, I. (2001), “Predicting air conditioning energy consumption
of a group of buildings using different heat rejection methods,” Energy
and Buildings, Vol. 33, pp. 151–166.
York by Johnson Controls. (2012), “AIRAH (NSW) presentation on chiller products,”
ACTNSW/PPNSW_17-07-2012-SK.PDF (access 27 October
Yu, F.W. and Chan, K.T. (2005), “Electricity end-use characteristics of air-cooled chillers
in hotels in Hong Kong,” Building and Environment, Vol. 40, pp. 143–151.
Yu, F.W. and Chan, K.T. (2006), “Low-energy design for air-cooled chiller plants in airconditioned
buildings,” Energy and Buildings, Vol. 38, pp. 334–339.
Yu, F.W. and Chan, K.T. (2009), “Environmental performance and economic analysis of
all-variable speed chiller systems with load-based speed control,” Applied Thermal
Engineering, Vol. 29, pp. 1721–1729.
Yu, F.W. and Chan, K.T. (2010), “Simulation and electricity savings estimation of air
cooled centrifugal chiller system with mist pre-cooling,” Applied Energy, Vol. 87,
Yu, F.W. and Chan, K.T. (2010), “Economic benefits of optimal control for water-cooled
chiller systems serving hotels in a subtropical climate,” Energy and Buildings, Vol.
, pp. 203–209.
Yu, F.W., Chan, K.T. and Sit, R.K.Y. (2012), “Climatic influence on the design and operation
of chiller systems serving office buildings in a subtropical climate,” Energy
and Buildings, Vol. 55, pp. 500–507.