How To Obtain Efficiency From Characteristic Curves - Mitsubishi Electric Lossnay series Technical Manual

3. How to Obtain Efficiency from Characteristic Curves

How to Read Characteristic Curve
Recovery efficiency
Static pressure outside unit
•
Obtaining the efficiency when supply air and exhaust air volumes are different.
The efficiency obtained from the intake side air volume in each characteristic curve can be corrected with the air volume ratio
in the bottom right chart.
If the intake side and exhaust side duct lengths are greatly different or if a differential air volume is required, obtain the intake
side efficiency from the bottom right chart.
Air volume ratio =
Efficiency obtained
with air volume on
supply side from
characteristic curve
Recovery Static pressure
efficiency outside unit
Low notch air volume
Exhaust air volume
Supply air volume
Supply side efficiency
after correction
CHAPTER 4
Enthalpy recovery efficiency
(heating)
Enthalpy recovery efficiency
(cooling)
Total static pressure loss (or total straight pipe equivalent length)
Static pressure loss related parts
(straight pipe equivalent length total)
Pipe length
High notch air volume
Energy Recovery Efficiency Correction Curve
Energy recovery Exhaust air volume
Air volume ratio =
efficiency
Supply air volume
(%)
0.5 0.6
90
80
70
60
50
40 50 60
Corrected energy recovery efficiency (%)
•
Characteristics
1.2 1.3
0.7 0.8 0.9 1.0 1.1 1.4
70 80 90 100
U-41