Mitsubishi Electric Lossnay LGH-F1200RX5-E, Technical Manual

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U-41
CHAPTER 4
•
Characteristics
High notch air volume
3. How to Obtain Efficiency from Characteristic Curves
How to Read Characteristic Curve
•
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.
90
0.5 0.6 0.7
50 60 70 80 90 100
0.8 0.9 1.0 1.1 1.4
1.2 1.3
80
70
60
50
40
Ef
ficiency obtained fr
om suppl
y side air v
olume (%)
Energy recovery
efficiency
(%)
Air volume ratio =
Exhaust air volume
Supply air volume
Corrected energy recovery efficiency (%)
Recovery
efficiency Static pressure
outside unit
Temper
ature
recover
y efficienc
y
Enthalpy recovery efficiency
(heating)
Enthalpy recovery efficiency
(cooling)
Static pressure loss related parts
(straight pipe equivalent length total)
Pipe length
Recovery efficiency
Low notch air volume
Total static pressure loss (or total straight pipe equivalent length)
Static pressure outside unit
Efficiency obtained
with air volume on
supply side from
characteristic curve
Air volume ratio =
Exhaust air volume
Supply air volume
Supply side efficiency
after correction
Energy Recovery Efficiency Correction Curve