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Calculation Of Lossnay Economical Effects - Mitsubishi Electric Lossnay LGH-15RX3 Technical Manual

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CHAPTER 3 G General Technical Considerations

3. Calculation of Lossnay Economical Effects

The following is a sample questionnaire from which it is possible to assess the economical benefits of using the Lossnay in
particular applications.
(1) Setting of conditions
G
Return air volume (RA)
G
Outdoor air volume (OA) =
G
Air volume ratio (RA/OA) =
G
Air conditions
Season
Dry bulb
Item
temp.
DB [°C]
Outdoors
Indoors
G
Operation time: Heating =
Cooling =
G
Energy:
Heating =
Cooling =
Power rates: Winter: ¥/kWh
(2) Selection of Lossnay model (select from treatment air volume catalog)
G
Model name:
G
Processing air volume per unit RA =
G
Heat recovery efficiency : Heat recovery efficiency
G
Static pressure loss (unit-type) RA=
G
Power consumption (pack-type) = none because of unit type
(3) State of indoor blow air
Temperature [°C]
Enthalpy
[kJ/kg(kcal/kg)]
Numerical value
obtained from above
equation and
psychometric chart
26
3
=
m
/Hr
3
m
/Hr
Winter heating
Wet bulb
Relative
Absolute Enthalpy
temp.
humidity
humidity
× [kg/kg'] (kcal/kg')
WB [°C]
RH [%]
hours/day
hours/day
Type: Electricity
Type: Electricity
3
m
/Hr, OA =
Enthalpy recovery efficiency (cooling) =
Enthalpy recovery efficiency (heating) =
mm H
O OA =
2
Heating
= (Indoor temperature – outdoor air temperature) × = Outdoor air temperature – (outdoor air
heat recovery efficiency + outdoor air
temperature
=
= (Indoor enthalpy – outdoor air enthalpy) ×
enthalpy recovery efficiency + outdoor air
enthalpy
=
G
Dry-bulb temperature
G
Wet-bulb temperature
G
Relative humidity
G
Absolute humidity
G
Enthalpy
Dry bulb
i kJ/kg
temp.
DB [°C]
×
days/month
×
days/month
Cost: ¥
Cost: ¥
Summer: ¥
3
m
, Air volume ratio (RA/OA) =
=
%,
%,
%
mm H
O (Note: Each with filters)
2
temperature – indoor temperature) ×
heat recovery efficiency
=
= Outdoor air enthalpy – (outdoor air
enthalpy – indoor enthalpy) ×
enthalpy recovery efficiency
=
G
=
°C
Dry-bulb temperature
G
=
°C
Wet-bulb temperature
=
%
G
Relative humidity
G
=
kg/kg'
Absolute humidity
G
=
kg/kg (kcal/kg)
Enthalpy
Summer cooling
Wet bulb
Relative
Absolute Enthalpy
temp.
humidity
humidity
× [kg/kg'] (kcal/kg')
WB [°C]
RH [%]
×
months/year = hours/year
×
months/year = hours/year
/kWh
/kWh
/kWh
Cooling
=
=
=
=
=
i kJ/kg
°C
°C
%
kg/kg'
kg/kg (kcal/kg)

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