City University of Hong Kong Department Name

 

Solar air-conditioning

     

      Solar air-conditioning is envisioned as a sustainable mean to provide space conditioning for buildings, as solar energy is considered to be the primary energy source.  Solar air-conditioning is broadly categorized into solar-electric air-conditioning and solar-thermal air-conditioning.  The former mainly covers the solar-electric compression refrigeration, which uses photovoltaic panels to power up a conventional refrigeration machine.  The latter makes use of the solar thermal gain to drive the corresponding heat-driven cycle.  The solar absorption refrigeration, the solar adsorption refrigeration and the desiccant cooling belong to solar-thermal air-conditioning.  Through dynamic plant and building simulation for typical office in subtropical climate, the solar-electric compression refrigeration and the solar absorption refrigeration can have the year-round primary energy saving compared to the conventional electric-driven compression refrigeration.  On the other hand, the solid desiccant cooling, which is commonly designed for full air provision, can also have the energy saving potential comparatively.  To further advance the energy performance of the solar air-conditioning systems, different design strategies can be considered, such as the hybrid design between absorption/adsorption refrigeration and desiccant cooling, the high temperature cooling approach using radiant ceilings, and the articulation to the new indoor ventilation mean like displacement/stratum ventilation.  These strategies can enhance better use of solar thermal gain and reduce auxiliary heating.  As such, the solar air-conditioning systems would become more and more competitive in terms of year-round energy performance.

 

Annual profiles of primary energy consumption of different solar cooling systems and the conventional electric-driven

compression refrigeration for typical office in subtropical Hong Kong

(Abbreviation: AB: absorption refrigeration; ACVCR: conventional air-cooled vapour compression refrigeration; AD: adsorption refrigeration; DE: desiccant cooling; EL: electric compression refrigeration; ME: mechanical compression refrigeration; WCVCR: conventional water-cooled vapour compression refrigeration; et: evacuated tubes; fp: flat plate collectors; pv: photovoltaic panels)

 

Solar hybrid air-conditioning system with absorption chiller and solid desiccant cooling

Solar air-conditioning system using radiant ceiling cooling, as supported by adsorption chiller and desiccant dehumidification


Related publications :

Journal articles:

Fong, K.F., Chow, T.T., Lin, Z., Chan, L.S., Simulation-optimization of solar-assisted desiccant cooling system for subtropical Hong Kong. Applied Thermal Engineering, 30(2-3), 2010, 220-228.

Fong, K.F., Chow, T.T., Lee, C.K., Lin, Z., Chan, L.S., Comparative study of different solar cooling systems for buildings in subtropical city. Solar Energy, 84(2), 2010, 227-244.

Fong, K.F., Lee, C.K., Chow, T.T., Lin, Z., Chan, L.S., Solar hybrid air-conditioning system for high temperature cooling in subtropical city. Renewable Energy, 35(11), 2010, 2439-2451.

Fong, K.F., Chow, T.T., Lee, C.K., Lin, Z., Chan, L.S., Advancement of solar desiccant cooling system for building use in subtropical Hong Kong. Energy and Buildings, 42(12), 2010, 2386-2399.

Fong, K.F., Lee, C.K., Lin, Z., Chow, T.T., Chan, L.S., Application potential of solar air-conditioning systems for displacement ventilation. Energy and Buildings,43(9), 2011, 2068-2076.

Fong, K.F., Lee, C.K., Chow, T.T., Improvement of solar-electric compression refrigeration system through ejector-assisted vapour compression chiller for space conditioning in subtropical climate. Energy and Buildings, 43(12), 2011, 3383-3390.

Fong, K.F., Lee, C.K., Yuen, S.Y., Chow, C.K., Simulation-optimization of solar-thermal refrigeration systems for office use in subtropical Hong Kong. Energy, 36(11), 2011, 6298-6307.

Fong, K.F., Lee, C.K., Chow, T.T., Fong, A.M.L., Investigation on solar hybrid desiccant cooling system for commercial premises with high latent cooling load in subtropical Hong Kong. Applied Thermal Engineering, 31(16), 2011, 3393-3401.

Fong, K.F., Chow, T.T., Lee, C.K., Lin, Z., Chan, L.S., Solar hybrid cooling system for high-tech offices in subtropical climate C Radiant cooling by absorption refrigeration and desiccant dehumidification. Energy Conversion and Management, 52(8-9), 2011, 2883-2894.

Fong, K.F., Lee, C.K., Chow, T.T., Comparative study of solar cooling systems with building-integrated solar collectors for use in sub-tropical regions like Hong Kong. Applied Energy, 90(1), 2012, 189-195.

Fong, K.F., Lee, C.K., Towards net zero energy design for low-rise residential buildings in subtropical Hong Kong. Applied Energy, 93, 2012, 686-694.

Fong, SKF and Lee, CK. Investigation on hybrid system design of renewable cooling for office building in hot and humid climate. Energy and Buildings, 75, 2014, 1-9.

Conference papers:

Fong, K.F. and Chow, T.T., Application potential of solar-assisted desiccant cooling system in sub-tropical Hong Kong. Proceedings of Clima 2007 WellBeing Indoors, Helsinki, Finland, June 2007. (CD-ROM)

Fong, Square K.F., Chow, T.T., Lin, John Z., Chan, Apple L.S., Application potential of solar thermal technologies for buildings in Hong Kong. Conference Proceedings of Joint Hong Kong and Hangzhou Seminar for Sustainable Building, Hangzhou, China, September 2007, pp.118-126.

Fong, K.F. and Chow, T.T., Comparative study of different paradigms of evolutionary algorithm in the context of system optimization for solar desiccant cooling. Proceedings of eSim 2008, Quebec City, Canada, May 2008 (CD-ROM).

Fong, K.F., Lee, C.K., Chow, T.T., Application potential of solar adsorption refrigeration system in subtropical Hong Kong. Proceedings of Renewable Energy 2010, Yokohama, Japan, 27 June – 2 July 2010 (Download).

Lee, C.K., Fong, K.F., Chow, T.T., Solar desiccant cooling for subtropical Hong Kong. Proceedings of First International Conference on Sustainable Urbanization, Hong Kong, China, 15-17 December 2010. (CD-ROM)

Fong, K.F., Lee, C.K., Chow, T.T., Investigation on radiative load ratio of chilled beams on performances of solar hybrid adsorption refrigeration system for radiant cooling in subtropical city. Proceedings of World Renewable Energy Congress 2011, Linköping, Sweden, 8-11 May 2010. (CD-ROM)

 

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