Question 3.5: Insulation materials are chosen in part for their mechanical...

(a) For a wrapping pipe insulation, from Table , we choose

pipe insulation (slag or glass):

\left\langle\rho \right\rangle =48  t0 64 Kg/m^{3},  T = 297 K,  \left\langle k \right\rangle = 0.033 W/m-K.

The denser wrapping \left\langle\rho \right\rangle = 160     to       240  kg/m^{3}, adds strength without much increase in \left\langle k \right\rangle (i.e., \left\langle k \right\rangle = 0.048 W/m-K).

(b) For a foam formed in place, from Table, we choose

polyurethane foam (formed in place):

\left\langle \rho \right\rangle=70 Kg/m^{3},          , T = 300 K,                  \left\langle k \right\rangle=0.026 W/m-K 

There are a variety of foams formed in place and depending on the strength needed, different \left\langle \rho \right\rangle are selected.

(c) For an insulating cement that can be applied as a coating to the outside of a pipe, from Table, we choose
cement (insulating):

\left\langle \rho \right\rangle=380     to   480  Kg/m^{3},          , T = 297   K,                  \left\langle k \right\rangle=0.071 W/m-K

(d) For a blanket insulation, from Table, we choose
blanket and felt (aluminosilicate fibers):

\left\langle \rho \right\rangle=96   t0   128  Kg/m^{3},          , T = 297   K,                  \left\langle k \right\rangle=0.036 W/m-K

(e) For a mineral powder insulation, from Table, we choose
diatomaceous-earth powder (coarse):

\left\langle \rho \right\rangle=320 Kg/m^{3},          , T = 1,144   K,                  \left\langle k \right\rangle=0.062 W/m-K

Note that choosing a higher density will generally increase   \left\langle k \right\rangle noticeably