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How To Obtain Efficiency From Characteristic Curves - Mitsubishi Electric Lossnay LGH-15RX3 Technical Manual

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CHAPTER 4 G Characteristics

3. How to Obtain Efficiency from Characteristic Curves

3.1 Commercial-use Lossnay
How to read Commercial-use Lossnay characteristic curve
Recovery efficiency
5
Static pressure outside unit
4
At 50 Hz, equivalent to 60 Hz at dotted line
G
Obtaining the efficiency when supply air and exhaust air volumes differ
The efficiency obtained from the intake side air value in each characteristic curve can be corrected with the air volume ratio
in the chart on the right.
If the intake side and exhaust side duct lengths differ greatly or if a differential air volume is required, obtain the intake side
efficiency from the chart on the right.
Efficiency obtained
with air volume on
supply side from
characteristic curve
3.2 Building-use Lossnay
How to read LP type Lossnay characteristic curve
6
Heat recovery
efficiency
when exhaust
air volume and
supply air volume
are the same
Required static
3
pressure on
supply side
Required static
4
pressure on
exhaust side
Required air volume on exhaust side
44
Recovery
Static pressure
efficiency
outside unit
Exhaust air volume
Air volume ratio =
Supply air volume
Supply side efficiency
after correction
Exhaust air volume
Air volume ratio =
Supply air volume
Efficiency correction curve
1
Required air volume on supply side
Heat recovery efficiency
2
on supply side when
exhaust air volume and
supply air volume differ
Enthalpy recovery efficiency
(heating)
Enthalpy recovery efficiency
(cooling)
1
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 at 60 Hz
Low notch air volume at 60 Hz
3
Heat recovery efficiency correction curve
Heat recovery
efficiency
(%)
90
80
70
60
50
40
How to read LU, LUT, and LUP type Lossnay characteristic curves
5
7
Heat recovery
efficiency
when exhaust
air volume and
supply air volume
are the same
Static pressure
4
loss on supply
side
Static pressure
5
loss on
exhaust side
6
2
Exhaust air volume
Air volume ratio =
Supply air volume
0.5
0.6
0.7
0.8
50
60
70
80
Corrected heat recovery efficiency (%)
Exhaust air volume
Air volume ratio =
Supply air volume
Efficiency correction curve
1
Required air volume on supply side
3
Required air volume on exhaust side
1.2 1.3
0.9
1.0 1.1
1.4
90
100
6
2
Heat recovery efficiency
on supply side when
7
exhaust air volume and
supply air volume differ

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