How can I know the exact void ratio of rainwater harvesting module?

2017-06-16

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 cubiccenti meter, m is weight, V is volume.

Take 1 CBM M2016Stank as example 1

    EachM2016S 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 

Thevoid 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)

     EachM2015F 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

Thevoid ratio of each M2015F is 95%.

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