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The webinar was presented on January 21, 2015, and focused on the effective use of central heat pump water heaters (HPWHs) and control systems to reduce the energy use in hot water distribution. Presenters and specific topics for this webinar included:

  • Elizabeth Weitzel from the Building America team, Alliance for Residential Building Innovation, presenting Multifamily Central Heat Pump Water Heating. The presentation will focus on the findings of monitoring and evaluation effort of a nominal 10.5 ton central HPWH installed at the UC Davis West Village Zero Net Energy community, which was monitored from October 2011 through February 2013. The unit is one of 45 similar HPWHs installed in student apartment buildings at West Village. Findings from the field monitoring were used to develop and validate a TRNSYS simulation to project performance in various climates. The monitoring provided useful information to the developer and installing contractors as they worked through early issues in implementing a technology new to them. View the presentation.
  • Jordan Dentz and Eric Ansanelli from the Building America team, Advanced Residential Integrated Energy Solutions, presenting Control Strategies to Reduce Energy Consumption of Central Domestic Hot Water. Water heating is typically the second largest energy end use in U.S. buildings, exceeded only by space conditioning. Central domestic hot water (CDHW) systems are commonly used in multifamily buildings to provide domestic hot water. This presentation will summarize the results of a field study in which two types of CDHW controls—demand control and temperature modulation—were retrofit into four existing multifamily buildings in New York. Energy savings, cost savings and resident satisfaction will be presented, including interactive effects with space conditioning systems. View the presentation.