Void ratio determines a rainwater harvesting module can load how much water, then how to calculate the void ratio? Check below examples, hope it will help.
Given: p = m/v , p= 0.92g per cubic centimeter, m is weight, V is volume.
Take 1 CBM M2016S tank as example 1
Each M2016S tank is 9.42kg, total 4pcs tank per CBM (1CBM=1000000 cubic centimeter)
m=9.42X4=37.68kg, V= 37.68/0.92≈40.96, 40.96/1000000≈0.00004
The void ratio of each M2016S is 96%.
Take 1 CBM M2015F tank as example 2 (When installation, 2pcs tank only use 1 big plate, so during the calculation we need take out excess spare plate)
Each M2015F tank is 11.97kg, total 5pcs tank per CBM
m=11.97X5=59.85kg, 59.85-6.68(4pcs spare plate)=53.17kg,
V=53.17/0.92≈57.79, 57.79/1000000≈0.00005
The void ratio of each M2015F is 95%.
Below is our Rainwater Harvesting tanks NEWEST void ratio:
| Item No | M2016S | M2016B | M2014 | M2015H | M2015F |
| Void Rate | 96% | 96.1% | 95% | 94% | 95% |