Stump the Energy Nerd 2014, Part 2

On Day 2 of NESEA's Building Energy 14 conference, Martin Holladay returned to the trade show stage for a second round of Stump the Energy Nerd

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Produced by Dariusz Kanarek


EDITOR’S PICKS

How To Do Everything

Recorded at the demonstration stage at NESEANorth East Sustainable Energy Association. A regional membership organization promoting sustainable energy solutions. NESEA is committed to advancing three core elements: sustainable solutions, proven results and cutting-edge development in the field. States included in this region stretch from Maine to Maryland. www.nesea.org's Building Energy 14 conference in Boston on March 6, 2014, Martin Holladay answers questions from the audience at the second session of “Stump the Energy Nerd.”

Martin responds to questions about:

  • the PHPP spreadsheet,
  • energy modeling programs,
  • HRV(HRV). Balanced ventilation system in which most of the heat from outgoing exhaust air is transferred to incoming fresh air via an air-to-air heat exchanger; a similar device, an energy-recovery ventilator, also transfers water vapor. HRVs recover 50% to 80% of the heat in exhausted air. In hot climates, the function is reversed so that the cooler inside air reduces the temperature of the incoming hot air. systems vs. exhaust-only ventilationMechanical ventilation system in which one or more fans are used to exhaust air from a house and make-up air is supplied passively. Exhaust-only ventilation creates slight depressurization of the home; its impact on vented gas appliances should be considered. systems,
  • vented roof assemblies vs. unvented roof assemblies,
  • the factors that affect asphalt shingle temperatures,
  • unvented cathedral ceilings insulated with cellulose,
  • using basement vents to try to dry out a wet basement,
  • cold-weather performance of polyisoPolyisocyanurate foam is usually sold with aluminum foil facings. With an R-value of 6 to 6.5 per inch, it is the best insulator and most expensive of the three types of rigid foam. Foil-faced polyisocyanurate is almost impermeable to water vapor; a 1-in.-thick foil-faced board has a permeance of 0.05 perm. While polyisocyanurate was formerly manufactured using HCFCs as blowing agents, U.S. manufacturers have now switched to pentane. Pentane does not damage the earth’s ozone layer, although it may contribute to smog. foam,
  • heat-pump water heaters,
  • the carbon footprintAmount of carbon dioxide and other greenhouse gases that a person, community, industry, or other entity contributes to the atmosphere through energy use, transportation, and other means. of conference attendees who travel by airplane, and
  • selecting an appropriate water heater.

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