update CHP.heating_utilities

[codecov[bot]]

Codecov Report

Merging #90 (7513398) into main (94d4acf) will decrease coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
- Coverage   75.41%   75.40%   -0.01%     
==========================================
  Files          85       85              
  Lines       14523    14522       -1     
  Branches     1590     1590              
==========================================
- Hits        10952    10951       -1     
  Misses       3112     3112              
  Partials      459      459              

Flag	Coverage Δ
unittests	75.40% <100.00%> (-0.01%)	:arrow_down:

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Impacted Files	Coverage Δ
qsdsan/sanunits/_combustion.py	76.80% <100.00%> (-0.12%)	:arrow_down:

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[jiananf2]

the original script has empty CHP.heat_utilities, fixed so that CHP can update heating utilities

[yalinli2]

awesome & thanks!