Calculation based on DIN 55474
n = 1/a · ( V · b + m · c + A · e · D · t )
n = number of the drying agent units (1 unit is 80g of drying agent in good condition)
a = amount of water vapour to be adsorbed by drying agent unit according to the permitted final moisture content
Final Moisture:
20 % RH a = 3 g
40 % RH a = 6 g
60 % RH a = 8 g
e = correction factor with regard to the final moisture:
for 20 % RH e = 0,9
for 40 % RH e = 0,7
for 60 % RH e = 0,6
v = volume inside the packaging in m³
b = humidity content per m³ air subject to the temperature and relative humidity during the packing, i.e. at 20°C and 85%RH b
= 15g/m³.
m = weight of the hygroscopic packing in kg
c = factor for moisture content per gram of the hygroscopic packing aid subject to the dry condition for wood, paper and
cardboard
with an undefined moisture content c = 140
with defined pre-desiccation c = 0
A = surface of the barrier foil in m²
D = water vapour permeability for the expected climate in g/m² D. Regulation in compliance with DIN 53122 or the
information supplied by the barrier foil manufacturer.
t = transport and storage time in t (days)
E-gen Building:
Comment [TSF1]: Considered only Air
n = 1/6 * ((4.5*8*4) * 15 + 80000 * 0 + 15 * 0.7 * 1 * 30) conditioned space. Additional measure 2 x
250g shall be put in each panel to enhance
the protection.
= 412.5 * 80g Comment [TSF2]: Consider 30 days for
visual check for whether the depletion of
the desiccant to be replaced.
= 33 kg of desiccant * (safety factor 1.2)
=39.6 kg
Electrical Building:
n = 1/6 *
(((1.91*15.2*5.2)+(1.85*15.2*5.2)+(1.55*15.2*5.2)+(1.3*15.2*5.2)+(1.7*14.5
Comment [TSF3]: Considered only Air
*5.2)+(1.98*14.5*5.2) +(1.48*9*4.26)+(1.7*12*4.26) )* 15 + 140000 * 0 + (15 conditioned space. Additional measure 2 x
* 0.7 * 1 * 30)) 250g shall be put in each panel to enhance
the protection.
= 2411.43 * 80g
= 192.9kg of desiccant * (safety factor 1.2)
=231.5 kg
LQ: 1
Level 1 interior area: 3674ft2 = 341.33m2
n = 1/a · ( V · b + m · c + A · e · D · t )
n= 1/6. (341.33*2.55 + 100 * 25 + 30* 0.7 * 1 * 30)
= 666.73 * 80g
= 53kg of desiccants * (safety factor 1.25)
=66.7kg of desiccant required.
Level 2 interior area: 3621ft2 = 336.4m2
n= 1/6. (336.4*2.55 + 100 * 25 + 30* 0.7 * 1 * 30)
= 664.64 * 80g
= 53.2kg of desiccants * (safety factor 1.25)
=66.5kg of desiccant required.
Level 3 interior area: 3562ft2 = 330.92 m2
n= 1/6. (330.92*2.55 + 100 * 25 + 30* 0.7 * 1 * 30)
= 662.3 * 80g
= 53kg of desiccants * (safety factor 1.25)
=66.2kg of desiccant required.
Level 4 interior area: 1544ft2 = 143.44 m2
n= 1/6. (143.44*2.55 + 100 * 25 + 30* 0.7 * 1 * 30)
= 582.62 * 80g
= 46.6kg of desiccants * (safety factor 1.25)
=58.3kg of desiccant required.
Total minimum weight of desiccants required = 66.7 + 66.5 +66.2+58.3 = 257.7 kg Comment [TSF4]: 1kg bag to be
purchased 260. Location to be on the floor
or hang on the panel. 30 days duration,
Number of panel/cabinet/ in level 1 ~= 10 inspection / replacement required after the
designated duration.
Number of panel/cabinet in level 2 ~= 23
Suggest to purchase 300 bags which the
remaining as spares.
Number of panel/cabinet in level 3 ~= 14
Comment [TSF5]: 2 * 250 g of
desiccants on each panel.
Number of panel/cabinet in level 4 ~= 30
Comment [TSF6]: 2 * 250 g of
desiccants on each panel.
Total of 250g bag required = 154
Comment [TSF7]: 2 * 250 g of
desiccants on each panel.
Comment [TSF8]: 2 * 250 g of
desiccants on each panel.
Comment [TSF9]: Suggest to purchase
200 bags which the remaining as spares.
