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Developing a Simplified Heat Pump Sizing Procedure. Or Don’t write specs you cant enforce. Current Status. PTCS allows for a full Manual J sizing procedure or the PTCS spreadsheet We don’t know how well this working COTRs “look” at the file, there is no QA follow up

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developing a simplified heat pump sizing procedure

Developing a Simplified Heat Pump Sizing Procedure

Or

Don’t write specs you cant enforce

current status
Current Status
  • PTCS allows for a full Manual J sizing procedure or the PTCS spreadsheet
    • We don’t know how well this working
      • COTRs “look” at the file, there is no QA follow up
      • The printout for most Manual J runs don’t list the inputs making verification impossible if attempted
      • Capacity tables of heat pumps are not required
obstacles to greater sizing
Obstacles to Greater Sizing
  • PTCS does not have the resources to QA the existing sizing procedure
    • Training
    • QA
    • Pre screening of raw data for error checking purposes
a possible approach that can be enforced
A possible approach that can be enforced
  • MUST BE SIMPLE!
  • Simple means a number two pencil and a sheet of paper.
  • Simple means it be error checked in I a minute
  • Simple means the QA person can verify input in 5 minutes
why simple might work
Why Simple Might Work
  • We only care about keeping the balance point below 30F
    • Cooling load is complicated, heating is not
  • We live in a place with dry summers, over sizing the AC will not cause discomfort due to high RH.
  • R410 heat pumps seem to have about 68% of their rated capacity at 30F
  • Limited to insulated homes with sealed and insulated ducts (like the current calculator)
what all this means
What all this Means
  • All we care about is the heat loss at 30F
    • No more “oops I got the wrong city”
    • One size fits all
  • We match that heat loss against 68% of the rated output and this produces the minimum size heat pump PTCS will accept
  • The heat loss procedure can be really simple
how it works
How It Works

Three Ton Hp is the min. size

OR the real simple method: 23,700/3= 660 sq ft per ton

next step
Next Step
  • Fine tune the capacity of heat pumps at 30F table
  • Test with contractors
  • Test with utility managers