Mitsubishi Electric Lossnay series Technical Manual page 102

Question
What are the economical
factors? (Using Japan
6
specifications)
If the air ventilated from
the toilet is included in
heat-recovery, will the
7
odors be transferred to
other rooms?
Between 55 to 60% of the heat energy that escapes with ventilation is
recovered by Lossnay unit, so the cooling/heating cost can be reduced by
approximately 43,000 yen per year. The initial costs can be reduced down to
a 59,000 yen increase when comparing an air conditioner, Lossnay, and
ventilator (fixed price base).
Calculation conditions
Cooling:
Room temperature/humidity: 78.8°F (26°C), 50%
Outdoor air temperature/humidity: 89.6°F(32°C), 70%
Heating:
Room temperature/humidity: 68°F (20°C), 50%
Outdoor air temperature/humidity: 32°F (0°C), 50%
Building:
General office facing south on middle floor: 1,076ft
Cooling load (room): 9.7 W/ft
Heating load (room): 7.2 W/ft
Ventilation volume: 300 CFM (500 m
Without Lossnay: Straight lock fan BFS-50SU . . . . . . . . . . . . Two units
With Lossnay: Lossnay LGH-F300RX type . . . . . . . . . . . . . . . One unit
Cooling/heating load (W):
Without Lossnay
Room Outdoors
Cooling 10,400 5,560
Heating 7,770 5,630
Air conditioner:
Without Lossnay : Ceiling-suspended cassette-type air
conditioner PLZ-J140KA9G9 . . . . . . . . . One unit
With Lossnay : PLZ-J112KA9G9 . . . . . . . . . . . . . . . . . . . One unit
Operation time:
Cooling 10 hours/day, 26 days/month, 4 months/year,
operation ratio: 0.7
Heating 10 hours/day, 26 days/month, 5 months/year,
operation ratio: 0.7
Power costs (Tokyo Power special industrial power 6 kV supply)
Summer: 16.15 yen /kWh, Other 14.65/kWh
For an example; if the total ventilation volume is 100, and the amount of
odors generated from the toilet, etc., is 30, the total volume of conditioned air
is still three times the ventilation amount. Thus, if the leakage rate of odors is
7% (hydrogen sulphide), it will be: 100 × 30% × 1/3 × 7% = 0.7%, and there
are no problems in terms of total air conditioned air volume. However,
exhaust is usually performed with a separate system. In the case of
ammonia, the rate is 2.8% using the same formula.
Note: (The rotary-type has approximately the same transmission rate, but
for ammonia, the transmission rate is 50% or more than the Lossnay
energy recovery method.)
CHAPTER 11
Answer
2 (100 m 2
2 (104 W/m 2 )
2 2
(77.7 W/m )
3
/h)
With Lossnay
Total Room Outdoors
15,960 10,400 2,340
13,400 7,770 2,140
•
Lossnay Q and A
Remarks
There are also
"savings in
maintenance costs" ,
"ventilation
functions" ,
"soundproofing" as
well as "comfort"
and "safety" .
)
Total
12,740
9,910
<Gas/smoke
transmission rate>
CO : 1%
CO : 2%
2
H S : 3%
2
NH : 3%
3
Smoke : 1% - 2%
Conditions
(Supply and exhaust
fans installed for
suction feed.
Standard treatment air
volume.)
U-93