Dr. Wei WU


Assistant Professor (School of Energy and Environment)

Dr. Wei WU

Contact Information

Office: YEUNG-G5714
Phone: 3442-4436
Fax: +(852)-3442-0688
Email: weiwu53@cityu.edu.hk

Research Interests

  • Novel absorption heating and cooling technologies
  • Renewable and waste energy technologies
  • Advanced heat pump technologies
  • Natural and low-GWP refrigerants
  • Net-zero energy buildings (NZEBs)

Dr. Wei Wu received his Bachelor’s degree from the Department of Building Environment and Energy Engineering at Huazhong University of Science and Technology in 2010. He obtained his PhD degree from the Department of Building Science at Tsinghua University in 2016. He was formerly a visiting scholar of the Center for Environmental Energy Engineering at University of Maryland in 2013. Since 2016, he served as a guest researcher of the Energy and Environment Division at the National Institute of Standards and Technology. He joined the City University of Hong Kong as an assistant professor in the School of Energy and Environment in July 2018.

Dr. Wu’s research is focused on sustainable building energy technologies. Aiming to mitigate the energy use and environmental impact in building sector from widened and deepened perspectives, his research work has been conducted at multi-levels: (1) investigating merits and potentials of alternative working fluids for heat pumps; (2) proposing a cluster of technologies for performance improvement of heat pumps; (3) exploring design and optimization methods of HVAC systems in net-zero energy buildings. He has obtained 9 patents, and he is now preparing a book titled Absorption Heating Technologies: Efficient Heating, Heat Recovery and Renewable Energy for Springer.

Research Interests:

Dr. Wu’s systematical multi-level research work provides innovative ideas and promising solutions to the developments of sustainable HVAC and buildings. At fluid level, he investigated natural and low-GWP refrigerants for vapor-compression heat pumps as well as alternative working fluids for absorption heat pumps. At equipment level, he conducted many outstanding studies on performance improvement of heat pumps, including novel absorption heating cycles, novel ground source heat pumps, and hybrid heat pumps for renewable/waste energy utilization. At building level, his research was focused on HVAC and PV design and optimization for net-zero energy buildings in different climates. Specific research topics are briefed as follows:

    • Novel absorption heating and cooling technologies. (1) Efficient utilization of fossil fuels; (2) Industrial energy saving; (3) Hybrid absorption-compression cycles; (4) Ionic-liquid absorption cycles.
    • Renewable and waste energy technologies. (1) Solar heating and cooling; (2) Geothermal heating, cooling and power; (3) Waste heating, cooling and power.
    • Advanced heat pump technologies. (1) Novel ground source heat pump (GSHP); (2) Hybrid GSHP for thermal balance and borehole reduction; (3) Hybrid solar-air-source heat pump; (4) Gas-engine heat pump.
    • Natural and low-GWP refrigerants. (1) CO2 GSHP and performance improvement; (2) GSHP using various alternative refrigerants; (3) Advanced CO2 heat pump cycles; (4) Low-GWP cycle simulation and optimization.
    • Net-zero energy buildings (NZEBs). (1) Energy-efficient and cost-effective HVAC in NZEBs; (2) Design and optimization of NZEBs in different climates; (3) Advanced energy systems in NZEBs

Position(s) available

Postdoctoral Fellows / Graduate Students / Research Assistants

  • Duties
    Conducting modeling and experimental research work on the topics of advanced heat pump technologies, energy-efficient HVAC systems, sustainable building technologies, renewable and waste energy technologies.

  • Requirements
    Effective writing and oral communication skills in English are essential. Postdoctoral Fellow applicants must have a PhD degree in Energy Engineering, Building Science, Refrigeration, Thermodynamics, Heat transfer, or a related field. Graduate Student applicants must have a Master’s or Bachelor’s degree in Energy Engineering, Building Science, Refrigeration, Thermodynamics, Heat transfer, or a related field. Excellent undergraduate students are considered for Research Assistants. Candidates with solid modeling skills and rich experimental experiences are preferred.

  • Application
    Please send the CV and supporting documents to Dr. Wu at weiwu53@cityu.edu.hk. Review of applications will begin immediately, and applications will be accepted until the position is filled. Successful applicants will receive competitive salary and benefits, commensurate with qualifications and experiences. Opportunities to attend conferences to present their research and interact with fellow researchers will also be offered. For more information, please email Dr. Wu. Only short-listed candidates will be contacted.

City University of Hong Kong is an equal opportunity employer and we are committed to the principle of diversity. We encourage applications from all qualified candidates, especially applicants who will enhance the diversity of our staff.

Selected Awards

  • The Special Postgraduate Scholarship of Tsinghua University (Highest honor for Tsinghua graduate students, 10 each year), 2015
  • The Outstanding Postgraduate Researcher of Tsinghua University (Highest honor for Tsinghua student researchers, 10 each year), 2014
  • The XiaAnshi Scholarship (4 graduates majored in HVAC&R in China), 2015
  • The Excellent Paper Award of Chinese Association of Refrigeration, 2015
  • National Scholarship for PhD students, 2014
  • First-class Scholarship of Tsinghua University, 2013
  • Distinguished Bachelor Thesis of Hubei Province, 2010
  • Built Environment Award for HVAC students in China, 2009

Selected Publications

  • W Wu*, T You, J Wang, BL Wang, WX Shi, XT Li. A novel internally hybrid absorption-compression heat pump for efficiency improvement and capacity adjustment. Energy Conversion and Management, 2018. (online)
  • W Wu*, T You, HY Zhang, XT Li. Comparisons of Different Ionic Liquids Combined with Trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) as Absorption Working Fluids. International Journal of Refrigeration, 2018, 88: 45–57.
  • W Wu, HM Skye*, PA Domanski. Selecting HVAC Systems to Achieve Comfortable and Cost-effective Residential Net-Zero Energy Buildings. Applied Energy, 2018, 212: 577-591.
  • W Wu*, HY Zhang, T You, XT Li. Thermodynamic Investigation and Comparison of Absorption Cycles Using Hydrofluoroolefins and Ionic Liquid. Industrial & Engineering Chemistry Research, 2017, 56 (35): 9906–9916.
  • W Wu, HY Zhang, T You, XT Li*. Performance comparison of absorption heating cycles using various low-GWP and natural refrigerants. International Journal of Refrigeration, 2017, 82: 56-70.
  • W Wu, WX Shi, J Wang, BL Wang, XT Li*. Experimental investigation on NH3–H2O compression-assisted absorption heat pump (CAHP) for low temperature heating under lower driving sources. Applied Energy, 2016, 176: 258-71.
  • W Wu, SY Ran, WX Shi, BL Wang, XT Li*. NH3-H2O water source absorption heat pump (WSAHP) for low temperature heating: Experimental investigation on the off-design performance. Energy, 2016, 115: 697-710.
  • W Wu, BL Wang, S Shang, et al. Experimental investigation on NH3-H2O compression-assisted absorption heat pump (CAHP) for low temperature heating in colder conditions. International Journal of Refrigeration, 2016, 67: 109–124.
  • W Wu, XT Li*, You T, BL Wang, WX Shi. Combining ground source absorption heat pump with ground source electrical heat pump for thermal balance, higher efficiency and better economy in cold regions. Renewable Energy, 2015, 84:74-88.
  • W Wu, WX Shi, XT Li*, BL Wang. Air source absorption heat pump in district heating: Applicability analysis and improvement options. Energy Conversion and Management, 2015, 96: 197–207.
  • W Wu, WX Shi, BL Wang, XT Li*. Annual performance investigation and economic analysis of heating systems with a compression-assisted air source absorption heat pump. Energy Conversion and Management, 2015, 98: 290-302.
  • W Wu, XT Li*, You T, BL Wang, WX Shi. Hybrid ground source absorption heat pump in cold regions: Thermal balance keeping and borehole number reduction. Applied Thermal Engineering, 2015, 90: 322-334.
  • W Wu, BL Wang, WX Shi, XT Li*. An overview of ammonia-based absorption chillers and heat pumps. Renewable and Sustainable Energy Reviews, 2014, 31: 681–707.
  • W Wu, T You, BL Wang, WX Shi, XT Li*. Simulation of a combined heating, cooling and domestic hot water system based on ground source absorption heat pump. Applied Energy, 2014, 126: 113–122.
  • W Wu, BL Wang, WX Shi, XT Li*. Absorption heating technologies: A review and perspective. Applied Energy, 2014, 130: 51–71.
  • W Wu, T You, BL Wang, WX Shi, XT Li*. Evaluation of Ground Source Absorption Heat Pumps Combined with Borehole Free Cooling. Energy Conversion and Management, 2014, 79: 334–343.
  • W Wu, BL Wang, WX Shi, XT Li*. Techno-economic Analysis of Air Source Absorption Heat Pump: Improving Economy from a Design Perspective. Energy and Buildings, 2014, 81: 200–210.
  • W Wu, BL Wang, WX Shi, XT Li*. Performance Improvement of Ammonia/absorbent Air Source Absorption Heat Pump in Cold Regions. Building Services Engineering Research and Technology, 2014, 35(5): 451–464.
  • W Wu, BL Wang, T You, WX Shi, XT Li*. A potential solution for thermal imbalance of ground source heat pump systems in cold regions: Ground source absorption heat pump. Renewable Energy, 2013, 59: 39–48.
  • W Wu, WX Shi, BL Wang, XT Li*. A new heating system based on coupled air source absorption heat pump for cold regions: Energy saving analysis. Energy Conversion and Management, 2013, 76: 811–817.
  • W Wu, BL Wang, WX Shi, XT Li*. Crystallization Analysis and Control of Ammonia-Based Air Source Absorption Heat Pump in Cold Regions. Advances in Mechanical Engineering, 2013, doi:10.1155/2013/140341.
  • W Wu, XL Zhang, XT Li*, WX Shi, BL Wang. Comparisons of different working pairs and cycles on the performance of absorption heat pump for heating and domestic hot water in cold regions. Applied Thermal Engineering, 2012, 48: 349–358.
  • XT Li*, W Wu, WF Chuck. Energy demand for hot water supply for indoor environments: Problems and perspectives. Indoor and Built Environment, 2015; 24(1): 5–10.
  • XT Li*, W Wu, XL Zhang, WX Shi, BL Wang. Energy saving potential of low temperature hot water system based on air source absorption heat pump. Applied Thermal Engineering, 2012, 48: 317–324.
  • HY Zhang, B Gao*, W Wu, HY Li, Q Zhong, YY Chen, WJ Liu, YN Song, YX Zhao, XQ Dong, MQ Gong*, EC Luo, JY Hu. Helmholtz free energy equation of state for propane and R134a binary mixture. International Journal of Refrigeration, 2018, 89, 1-10.
  • T You, W Wu, WX Shi, BL Wang, XT Li*. An overview of the problems and solutions of soil thermal imbalance of ground-coupled heat pumps in cold regions. Applied Energy, 2016, 177: 515-536.
  • T You, XT Li*, W Wu, WX Shi, BL Wang, K Soga. Coupled heating of ground-coupled heat pump system with heat compensation unit: Performance improvement and borehole reduction. Energy Conversion and Management, 2017, 148: 57-67.
  • S Shang, XT Li*, W Wu, BL Wang, WX Shi. Energy-saving analysis of a hybrid power-driven heat pump system. Applied Thermal Engineering, 2017, 108: 54-65.
  • J Wang, BL Wang, W Wu, XT Li, WX Shi*. Performance analysis of an absorption-compression hybrid refrigeration system recovering condensation heat for generation. Applied Thermal Engineering, 2016, 108: 54-65.
  • T You, BL Wang, W Wu, WX Shi, XT Li*. Performance analysis of hybrid ground-coupled heat pump system with multi-functions. Energy Conversion and Management, 2015, 92, 47-59.
  • PL Zhang, BL Wang, W Wu, WX Shi, XT Li*. Heat recovery from Internet data centers for space heating based on an integrated air conditioner with thermosyphon. Renewable Energy, 2015, 80, 396–406.
  • T You, WX Shi, BL Wang, W Wu, XT Li*. A new ground-coupled heat pump system integrated with a multi-mode air-source heat compensator to eliminate thermal imbalance in cold regions. Energy and Buildings, 2015, 107, 103-112.
  • T You, BL Wang, W Wu, WX Shi, XT Li*. A new solution for underground thermal imbalance of ground-coupled heat pump systems in cold regions: heat compensation unit with thermosyphon. Applied Thermal Engineering, 2014, 64(1), 283-292.