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Question
What are the economical
6
factors? (This is for Japan)
If the air ventilated from the
toilet is heat recovered, will
7
the odors be transferred to
other rooms?
Between 55 to 60% of the heat energy that escapes with ventilation is
recovered by the Lossnay, so the cooling/heating cost can be reduced by
approximately 43,000 yen per year. The initial costs can be suppressed
down to a 59,000 yen increase when comparing the air conditioner,
Lossnay, and ventilator (list- price base).
Calculation conditions
Cooling:
Room temperature/humidity 26°C, 50%
Outdoor air temperature/humidity 32°C, 70%
Heating:
Room temperature/humidity 20°C, 50%
Outdoor air temperature/humidity 0°C, 50%
Building:
General office facing south on middle floor 100 m
Cooling load (room) 104 W/m
Heating load (room) 77.7 W/m
3
Ventilation volume: 500 m
Without Lossnay:Straight lock fan BFS-50SU . . . . . . . . . . 2 units
With Lossnay:Lossnay LGH-50RX type. . . . . . . . . . . . . . . 1 unit
Cooling/heating load (W):
Without Lossnay
Room Outdoors
Cooling
10400
5560
Heating
7770
5630
Air conditioner:
Without Lossnay : Ceiling-suspended cassette-type air
conditioner PLZ-J140KA9G9 . . . . . . . 1 unit
With Lossnay
: PLZ-J112KA9G9 . . . . . . . . . . . . . . . . . 1 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 ¥/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), this will be: 100 × 30% × 1/3 × 7% =
0.7%. Thus, no problem is seen 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 heat recovery method.)
CHAPTER 11
Answer
2
2
2
/h
With Lossnay
Total
Room Outdoors
15960
10400
2340
13400
7770
2140
Lossnay Q and A
Remarks
There are also
"savings in
maintenance cost",
"ventilation functions",
"soundproofing
effects" as well as
"comfort" and "safety"
which are not visible.
Total
12740
9910
<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.)
101
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