Wednesday, January 27, 2016: 9:45 AM-10:45 AM
Cutting-Edge Technologies
Chair:
Joy Altwies, Ph.D., P.E., University of Wisconsin-Madison
This session addresses three applications of thermal storage to offset energy consumption and increase building efficiency. A ventilated concrete slab is evaluated as a thermal storage to preheat outdoor air introduced into an air source heat pump system and showed an increase in the coefficient of performance (COP) and a decrease in energy consumption in the evening. Secondly a design build project utilized computational fluid dynamics (CFD) modeling to determine the number of chilled water storage tanks required to supplement chillers in the event of a power outage. Lastly, 'pre-cooling' control strategies are modeled and tested to find the temperature change and energy saving when incorporated prior to a demand response event.
1 Using Building's Thermal Mass As Short-Term Integrated Energy Storage (OR-16-C074)
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Navid Ekrami, Ryerson University
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Alan Fung, Ph.D., P.E., Ryerson University
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Effectivness of a ventilated concrete slab (VCS) as a thermal storage integrated with an Air Source Heat Pump (ASHP) and Building Integrated Photovoltaic/Thermal (BIPV/T) collector was studied. Design criteria of air channels inside the slab are discussed considering the mass flow rate of air and size of channels. A TRNSYS model of BIPV/T systems was used to estimate potential thermal generation of the BIPV/T panels in the winter. Generated thermal energy was stored in the VCS and then released back to the ASHP during night-time operation.
2 CFD Design and Validation of a Thermal Storage Tank System and Its Impact in a Design-Build Project (OR-16-C075)
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Michael Kilkeary, P.E., Southland Industries
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Robert Huston, Southland Industries
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This paper discusses how the use of advanced engineering tools in HVAC industry has increased as the cost of computational fluid dynamics (CFD) has become more affordable for engineering firms. We employed CFD in a design-build project in which conventional engineering tools were not sufficient to address the design challenges of developing an efficient chilled water thermal storage system. The system utilized a series of vertical tanks to store chilled water to supplement chillers in the event of a power failure. Chilled water is routed from the storage tanks to critical equipment during chiller re-start, bridging the gap in time that the chillers are unable to provide set-point chilled water due to power failure and subsequent required time to re-start.
3 Utilizing Passive Thermal Storage for Improving Residential Air-Conditioning Demand Response (OR-16-C076)
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Josh R. Wall, Ph.D., CSIRO Energy
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Harshal Upadhye, Electric Power Research Institute
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Jeremy Stoddard, CSIRO Energy
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As air conditioning (AC) has evolved from luxury to almost necessity, the rapid uptake of residential AC systems is creating major problems for our electricity network infrastructure, particularly on peak summer days. By using automated demand response (DR) signals, energy service providers aim to constrain the electrical demand that these systems place on the network. One such DR signalling scheme is Australian Standard 4755.3.1 that defines how air conditioning appliances respond to a set of initiating signals for reducing energy consumption. This paper highlights potential benefits obtained when performing ‘pre-cooling’ control strategies in summer prior to a demand response event.
