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Residential HVAC

Calculations are based on:

  • Performance maps from: D. Cutler, J. Winkler, N. Kruis, C. Christensen, M. Brendemuehl. 2013. Improved Modeling of Residential Air Conditioners and Heat Pumps for Energy Calculations. NREL/TP-5500-56354. https://www.nrel.gov/docs/fy13osti/56354.pdf.
  • Assumptions for c_d (cycling derate)
  • Assumptions for rated fan power (W/cfm)

Single-speed air conditioners

To calculate COP:

$ python air_conditioner.py SEER

Example w/ results:

$ python air_conditioner.py 13
COP_cooling: 4.0

Single-speed heat pumps

To calculate COP:

$ python heat_pump.py SEER HSPF

Example w/results:

$ python heat_pump.py 13 7.7
COP_cooling: 4.04
COP_heating: 3.38

Tests

Tests provide expected COPs for a given set of SEER/HSPF values.

To run all tests:

$ python tests.py

Testing ACs:
SEER = 8...
SEER = 10...
SEER = 13...
SEER = 14...
SEER = 15...
.
Testing HPs:
SEER = 8, HSPF=6.0...
SEER = 10, HSPF=6.2...
SEER = 13, HSPF=7.7...
SEER = 14, HSPF=8.2...
SEER = 15, HSPF=8.5...
.
----------------------------------------------------------------------
Ran 2 tests in 0.008s

OK

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