Stone mix concrete slabs are used to absorb thermal energy from flowing air that

Question

Stone mix concrete slabs are used to absorb thermal energy from flowing air that is carried from a large concentrating solar collector. The slabs are heated during the day and release their heat to cooler air at night. If the daytime airflow is characterized by a temperature and convection heat transfer coefficient of T infinity = 200 degrees celcius and h= 35 w/m^2 K, respectively, determine the slab thickness 2L required to transfer a total amount of energy such that Q/Qo = 0.90 over a t= 8-h period. The initial concrete temperature is Ti=40 degrees celcius.

Explanation / Answer

Ans: The equation for convection can be expressed as: q = h.A. dT (1) where q = heat transferred per unit time (W) A = heat transfer area of the surface (m2) h= convective heat transfer coefficient of the process (W/m2K or W/m2oC)=35 w/m2.K dT = temperature difference between the surface and the bulk fluid (K or degree C) = 200-40 = 160 K Plz explain what is Qo I don't understand it By the way If we know amount of energy required to transfer then from above formula we can find cross sectional area of the slab and correspondingly thickness can be found. If u still can't find thickness describe Qo ,i will give u an exact answer

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