Mitsubishi Electric Lossnay series Technical Manual page 42

7.3 Lossnay Operation
(1) Unit Operation Began
Daily Operation Began
Daily Operation Stops
(2) Inspection Date
(3) Months When Units are in Bypass Operation : Three months of April, May, June
(4) Total Operation Time
7.4 Changes Detected in the Lossnay Core
Two Lossnay Cores were removed from the 18 Lossnay LS-200
installed, and static pressure loss and exchange efficiencies were
measured. See chart on right that compares initial operation
to same unit 11 years later. The appropriate air volume for one
Lossnay Core was 300 CFM (500 m
point was ±120 CFM (±200 m
7.5 Conclusion
(1) Changes in the the Lossnay Core after approximately 11 years of use and an estimated 28,000 operation hours were not
found.
The static pressure loss was 0.60 to 0.64 in H
Pa) increase. The exchange efficiencies had decreased slightly to above 300 CFM (500 m
to be insignificant and remained in the measurement error range.
(2) The Core surface was black with dust, but there were no gaps, deformed areas, or mold that would pose problems during
practical use.
: September 1972
}
: 7:00
Average daily operation: 11 hours
: 18:00
: November 1983
: (134 – 33) months × 25 days/month × 11 hours/day = 27,775 hours
3
/hr), and the measurement
3
/hr) of that value.
O at 300 CFM (150 to 160 Pa at 500 m
2
•
CHAPTER 3 General Technical Considerations
Characteristics in change of Lossnay Core over time
90
80
Enthalpy recovery efficiency
during heating
70
300
(1.20)
200
(0.80)
100
(0.40)
0
Data from delivery (1974)
Data from 1983
Heat recovery
efficiency
Static pressure loss
300 500
(180) (300)
Treated air volume
3
/hr), which was a 0.04 in H
3
/hr), however, this is considered
700 CMH
(420) (CFM)
O (10
2
U-33