Or 25kg per module if we just bring the water to 105C and make very little steam
On Tue, Nov 8, 2011 at 9:06 AM, Berke Durak <[email protected]> wrote: > Cement has more specific heat capacity per mass, but not > per volume. > > One cubic meter of iron can hold something like 3.5 MJ per > kelvin, while the same volume of cement can hold something > like 2.33 MJ per kelvin. > > In addition I'm not sure cement can go above 800 > degrees Celsius, while iron melts at 1500 degrees. > > So one cubic meter of cement at 800 degrees celsius above > background can hold 800 x 2.33 MJ = 1.86 GJ. One cubic > meter of iron at 1500 degrees can hold 5.25 GJ. > > Now take the 9.5 GJ that has been reported. > With cement, you need 9.5e9/1.86e9 = 5.11 cubic meters. > With iron, you need 9.5e9/5.25e9 = 1.81 cubic meters. > > Assume you have 50 modules of 70 cm x 30 cm x 45 cm. > That makes 4.7 cubic meters. Not enough space for cement > (unless you know of some special kind of cement.) > > Using iron, it would fit, but it would weight way too much, at > 250 kg per module. > -- > Berke Durak > >
