Calculating Lossnay Cost Savings - Mitsubishi Electric Lossnay series Technical Manual

•
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)