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Heat Loss/Cold Gain from Set Point Temperature Control

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  • cornstoves
    Most homes are constant volume. Duh! Heating air expands the air! Duh2! When home air gets hot and expands - where does the expanded air go? Outside? That s
    Message 1 of 2 , Nov 1, 2006
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      Most homes are constant volume. Duh!
      Heating air expands the air! Duh2!
      When home air gets hot and expands - where does the expanded air go?
      Outside? That's not too smart. Duh3!
      When home air cools and contracts,what fills the air void? Outside
      air!
      That's not too smart. Duh4!

      With a set point HVAC control system, how many times per day does the
      hot air expand and the cold air contract? Does anyone know?
      Absolutely.
      Every time the HVAC heat actuates, the hot air expands to the outside.
      Every time the HVAC A/C cooler actuates, the air void is filled with
      outside air.
      How many times per day does the HVAC actuate?
      Not many during moderate temperatures so the utility bill is low
      except for the "averaging" of the annual bill where no one will
      notice.
      Multiple HVAC actuations occur during inclement cold or hot ambient
      temperatures so the utility bill is high but the utility bill is
      averages so no one takes notice.

      A corn stove has analog control rather than set point.
      The corn stove temperature remains steady.
      The room air does not repeatedly heat and cool with a corn stove.
      The room air is not constantly being pushed outside as it expands and
      constantly being pulled inside from the outdise as the room air cools.

      The corn stove controls room RH and room temperature at a steady
      pace. Room air stays in the room. Room air is not constantly being
      pushed outside and pulled back inside several time each day as the
      HVAS system actuates and deactivates.

      Water holds more energy than air. How does relative humidity (RH)
      affect the utility bill?
      No humidifier is constantly adding water with a properly operated
      corn stove.
      No de-humidifier is constantly removing water with a properly
      operated corn stove.
      The heat loss and gain to the outside with a corn stove is low RH
      air. The heat loss outside from corn stove heat is low energy air
      with low water content low RH air. At least the heat loss to the
      outside is not charged with high energy RH moisture from inside the
      room.
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