Mitsubishi Electric Lossnay LGH-F1200RX5-E, Technical Manual

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