Calculation Of Lossnay Economical Effects - Mitsubishi Electric Lossnay LGH-100RX3-CAN Technical Manual

CHAPTER 3 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
Return air volume (RA)
Outdoor air volume (OA) =
Air volume ratio (RA/OA) =
Air conditions
Season
Dry bulb
Item temp.
DB [°C]
Outdoors
Indoors
Operation time: Heating =
Cooling =
Energy: Heating = Type: Electricity
Cooling = Type: Electricity
Power rates: Winter:
(2) Selection of Lossnay model (select from treatment air volume catalog)
Model name:
Processing air volume per unit RA =
Heat recovery efficiency : Heat recovery efficiency
(3) State of indoor blow air
Temperature [°C]
Enthalpy [kJ/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
WB [°C] RH [%] × [kg/kg']
hours/day
hours/day
3
m /Hr, OA =
Enthalpy recovery efficiency (cooling) =
Enthalpy recovery efficiency (heating) =
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
=
Dry-bulb temperature
Wet-bulb temperature
Relative humidity
Absolute humidity
Enthalpy
Dry bulb
i temp.
[kJ/kg] DB [°C]
× days/month ×
days/month
× ×
Cost:
Cost:
¥/kWh Summer:
3
m /Hr, Air volume ratio (RA/OA) =
= %,
%,
%
temperature – indoor temperature) ×
heat recovery efficiency
=
= Outdoor air enthalpy – (outdoor air
enthalpy – indoor enthalpy) ×
enthalpy recovery efficiency
=
= °C Dry-bulb temperature
= °C Wet-bulb temperature
= % Relative humidity
= kg/kg' Absolute humidity
= kJ/kg Enthalpy
Summer cooling
Wet bulb Relative Absolute Enthalpy
temp. humidity humidity
WB [°C] RH [%] × [kg/kg']
months/year = hours/year
months/year = hours/year
¥/kWh
¥/kWh
¥/kWh
Cooling
=
=
=
=
=
i
[kJ/kg]
°C
°C
%
kg/kg'
kJ/kg