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Building America Webinar: Retrofitting Central Space Conditioning Strategies for Multifamily Buildings

The webinar on July 16, 2014, focused on improving the performance of central space conditioning systems in multifamily buildings. Presenters discussed hydronic heating strategies and the evaluation of thermostatically controlled radiator valves (TRVs).

  • Jordan Dentz and Hugh Henderson, Advanced Residential Integrated Energy Solutions (ARIES), discussed the relative effectiveness of various control strategies to improve hydronic space heating performance in three low-rise multifamily buildings in Cambridge, MA. Presenters showed results from an analysis of three boiler control strategies, more aggressive outdoor rest curves, nighttime setback of supply water temperature, and boiler cutoff based on average indoor temperature setpoint. Also, Jordan and Eric Ansanelli reviewed the past research on TRV effectiveness, summarized the results of an industry survey on the use of TRVs and discussed results of a new field test designed to evaluate the effectiveness of new and old TRVs on a steam-heated building with convectors.  View the presentation.
  • Peter Ludwig and Russell Ruch, Elevate Energy, focus on two studies conducted to identify best practices, costs, and savings associated with optimizing steam and hydronic systems through increased main line air venting, replacing radiator vents, improving circulation pump efficiency, and upgrading boiler control systems. Results of these measures included a more even distribution of heat throughout the buildings, increased tenant comfort and a significant natural gas savings. View the presentation.