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Calculating Lossnay Cost Savings - Mitsubishi Electric Lossnay series Technical Manual

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CHAPTER 3
General Technical Considerations

2. Calculating Lossnay Cost Savings

Use the following pages to assess the economical benefits of using the Lossnay in particular applications.
(1) Conditions
Return air volume (RA)
Outdoor air volume (OA) =
Air volume ratio (RA/OA) =
Air conditions
Season
Dry bulb
temp.
Item
DB
[°F]
[°C]
Outdoors
Indoors
Operation time: Heating =
Cooling =
Energy:
Heating = Type: Electricity
Cooling = Type: Electricity
Power rates: Winter:
(2) Lossnay Model
Model name:
Processing air volume per unit RA =
Energy recovery efficiency : Energy recovery efficiency
Static pressure loss (unit-type) RA=
Power consumption (pack-type) = none because of unit type
(3) Indoor Blow Air Conditions
[°F]
Temperature
[°C]
[Btu/lb]
Enthalpy
[kJ/kg]
Data obtained from
above equation
and
psychrometric chart
U-24
3
=
CFM (m
/hr)
3
CFM (m
/hr)
Winter Heating
Wet bulb
Relative
Absolute
temp.
humidity
humidity
WB
RH
×
[°F]
[%]
[Ib/Ib']
[°C]
[%]
[kg/kg']
hours/day ×
hours/day ×
dollar/kWh
CFM (m
3
/hr), OA =
Enthalpy recovery efficiency (cooling) =
Enthalpy recovery efficiency (heating) =
Pa OA =
Heating
=
(Indoor temperature – outdoor air temperature) ×
energy recovery efficiency + outdoor air
temperature
=
=
(Indoor enthalpy – outdoor air enthalpy) ×
enthalpy recovery efficiency + outdoor air
enthalpy
=
Dry-bulb temperature
Wet-bulb temperature
Relative humidity
Absolute humidity
Enthalpy
Enthalpy
Dry bulb
i kJ/kg
temp.
DB
(Btu/Ib)
[°F]
(kcal/kg')
[°C]
days/month ×
days/month ×
Cost:
Cost:
Summer:
CFM (m
3
/hr), Air volume ratio (RA/OA) =
=
%,
%,
%
Pa (Note: Each with filters)
=
Outdoor air temperature – (outdoor air
temperature – indoor temperature) ×
energy recovery efficiency
=
=
Outdoor air enthalpy – (outdoor air
enthalpy – indoor enthalpy) ×
enthalpy recovery efficiency
=
=
°F (°C)
Dry-bulb temperature
=
°F (°C)
Wet-bulb temperature
=
%
Relative humidity
=
Ib/Ib' (kg/kg')
Absolute humidity
=
Btu/Ib (kg/kg)
Enthalpy
Summer Cooling
Wet bulb
Relative
Absolute
temp.
humidity
humidity
WB
RH
×
[°F]
[%]
[Ib/Ib']
[°C]
[%]
[kg/kg']
months/year =
hours/year
months/year =
hours/year
dollar/kWh
dollar/kWh
dollar/kWh
Cooling
=
=
=
=
=
Enthalpy
i kJ/kg
(Btu/Ib)
(kcal/kg')
CFM (m
3
/hr)
°F (°C)
°F (°C)
%
Ib/Ib' (kg/kg')
Btu/Ib (kg/kg)

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