Battery room ventilation calculation software
Battery Room Ventilation Calculation - battMV
battery room ventilation to EN IEC 62485 (replace EN 50272) Standards using hydrogen concentration dilution method
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For Android OS, see aBattMV.
battMV: just point & click design
Design of battery room ventilation using hydrogen concentration dilution method has been made easier with battMV program - a small Windows PC program specially designed for engineers & designers.
Aim: creating a mobile design environment (ShowMe!) for the practising engineers & designers in today's mobile world.
Results: Instant solutions at your fingertips.
Highlights:
battery room ventilation calculations
by Hydrogen concentration dilution method in according to EN IEC 62485-2 and EN IEC 62485-3 (replace EN 50272-2 & EN 50272-3) Standards
"Select & Click" with built-in data like Igas, battery rated capacity, etc
louvre sizer
save results for printing
in SI & IP units
Design Principles . . .
The battery room ventilation is calculated in accordance to EN IEC 62485-2 & EN IEC 62485-3 (replace EN 50272-2 & EN 50272-3) Standards. The ventilation flow rate is calculated using the following formula:
Q = v * q * s * n * Igas * Cn / 100
where
Q = ventilation air flow (CMH)
v = necessary hydrogen dilution factor (depends on % of air-hydrogen mixture)
q = hydrogen release rate, typically=0.00042 m3/Ah
s = safety factor, generally=5 for building projects
n = number of cells
Igas = current producing gas during charging (A/100Ah)
Cn = capacity of a battery (Ah). Note: This refers to rated ampere-hour capacity of lead acid or NiCd cell of the battery.
Igas value
battMV main page
Igas selection
Louvre Sizer
Room Volume Calculator
How to calculate ventilation requirements for a battery room?
Instant results at your fingertips on-the-move with battMV program.
Example (in English units)
A battery room (40 ft x 30 ft x 15 ft high) contains 10 batteries. Each battery has 18 cells. The rated capacity of the battery is 850 Ah. Boost charging method is employed for charging of battery. The hydrogen concentration in the room shall be kept below 1%. Find the hydrogen concentration in the room, and ventilation rate required.
Ignore the volume occupied by the battery.
Instant results
Nos. of cell per battery = 18
Battery rated capacity (Ah) = 850
Nos. of battery = 10
Charging current (A/Ah) = 0.02
H2 release rate (ft³/h) = 0.01474
H2 produced (ft³/h) = 45.1044
Nett room vol (ft³) = 18000.00
% H2 after 1 hr (%) = 0.2506
Allowable H2 (%) = 1
Safety factor = 5
Airflow required (CFM) = 372.11
Room airchange/hr = 1.24
The following duct sizing result is calculated using Ductulator Plus program (to be purchased separately):
Retangular Duct sizing......
Friction loss rate =0.1 in.wc/100'
Duct roughness, e =0.0003 ft
Air volume =372.11 CFM
Duct height =6 in
Duct width =13 in
Duct velocity =697.94 FPM
details...........
(1) Flow area, A = 0.533 sq.ft
(2) Hydraulic dia, Dh = 8.2 in
(3) Reynolds nos, Re = 48,851
(4) Relative roughness, e/Dh = 0.000441
(5) Friction factor, ff = 0.022471
(friction factor solved by ColeBrook equation)
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battMV
Price: USD 7.90 only
OS requirements: Windows
For Android phone OS, see aBattMV
