(4) Ventilation Load and Energy Recovery
Ventilation load without
Lossnay (q
)
1
Ventilation load with
Lossnay (q
)
2
Energy recovery (q
)
3
Ventilation load (%)
(5) Recovered Money (Power Rates)
Cost savings
(dollar)
Heating
=
Air specific gravity × ventilation volume
× (indoor enthalpy – outdoor air enthalpy)
=
=
Ventilation load (q
)
1
× ( 1 – enthalpy recovery efficiency)
=
or
=
Air specific gravity × ventilation volume
× (indoor enthalpy – indoor blow enthalpy)
=
q
– q
1
2
=
–
=
or
Ventilation load (q
)
=
1
× enthalpy recovery efficiency
•
Ventilation load =
W =
•
Ventilation load with Lossnay
=
W =
•
Energy recovered =
W =
Heating
=
Energy recovered: kW × Unit price $/kWh ×
operation time Hr/year =
kW ×
=
Hr/year
=
•
CHAPTER 3
General Technical Considerations
=
Air specific gravity × ventilation volume
× (outdoor air enthalpy – indoor enthalpy)
=
=
Ventilation load (q
× ( 1 – enthalpy recovery efficiency)
=
or
=
Air specific gravity × ventilation volume
× (indoor blow enthalpy – indoor enthalpy)
=
q
– q
1
=
=
or
Ventilation load (q
=
× enthalpy recovery efficiency
•
%
Ventilation load =
•
ventilation load with Lossnay
%
=
•
%
Energy recovered =
=
Energy recovered: kW × Unit price $/kWh ×
$/kWh ×
operation time Hr/year =
=
Hr/year
=
Cooling
)
1
2
–
)
1
W =
W =
W =
Cooling
kW ×
$/kWh ×
%
%
%
U-25