Wednesday, June 28, 2017: 9:45 AM-10:45 AM
HVAC&R Systems and Equipment
Chair:
Marija Todorovic, P.Eng., University of Belgrade
Thermal storage systems are energy efficient, resource efficient and reduce load on power plants during peak times. Therefore, employing thermal storage systems reduces carbon footprint and positively affects climate change. This session discusses methods of operating and optimizing thermal storage systems for both heating and cooling. These presentations also indicate rate of return for improvement projects, COP and costs of operation.
1 Experimental Performance Study on a CO2 Heat Pump System with Thermal Storage (LB-17-C061)
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Fang LIU, Ph.D., P.E., Shanghai University of Electric Power
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Weiquan Zhu, Shanghai University of Electric Power
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Yang Cai, Shanghai University of Electric Power
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The experimental performances of a dual-mode CO2 heat pump system coupled with hot and cold thermal storage is investigated in this paper. This combined system was tested by controlling compressor frequency, expansion valve opening and hot and cold circulation water flow rates. Experimental results show that high compressor frequency benefits the combined system performances. Expansion valve opening affects the thermal stratification of thermal storage tanks very slightly. Low hot and cold water flow rates are good for the thermal stratification of thermal storage tanks although high water flow rates can enhance the COP of heat pump system; and thermal stratification in thermal storage tanks is one of the most important impact factors on the COP of heat pump.
2 Integrated Optimisation of PV and Storage Systems for UK Non-Domestic Buildings (LB-17-C062)
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Salvador Acha, Ph.D., Imperial College London
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Arthur Mariaud, Imperial College London
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Ned Ekins-Daukes, Ph.D., Imperial College London
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Nilay Shah, Ph.D., Imperial College London
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Growing concerns about climate change, new decarbonization agenda, research for energy independence and geopolitical evolutions have led countries and industries to rethink their energy consumption. In this research for sustainability, major stakeholders in the UK food retail market are investigating pathways to reduce their carbon footprint. Low-carbon energy production technologies such as photovoltaic systems coupled with battery storage constitute potential solutions, also driven by rising electricity bills. The purpose of this paper is to develop an end-user optimization model assessing potential benefits of photovoltaic systems associated with battery storage for commercial buildings integration.
3 Efficient Interaction between Energy Demand, Surplus HEAT/Cool and Thermal Storage (LB-17-C063)
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Trond Thorgeir Harsem, P.Eng., Norconsult AS
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Janne Grindheim, M.D., Norconsult AS
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This paper discusses new methods for the operation of interacting simulating models. These methods provide tools to step into optimization of combinations of integrated energy systems. The main design issues that are addressed are hydronic flow system and the sizing of storage systems. The hydronic layout is important with respect to utilization of exergy i.e. water temperature, but the research also shows the importance of control strategies on energy savings. A proposed new hydronic layout and control design are described in this paper, as applied to heating, cooling and storage systems.
