Total R-Value The R-values of any two or three materials can be added to determine the total R-value (R.).
11) Find the total R-value for the walls below.
a) Calculate R, for Wall A.
b) Calculate R for Wall B.
c) Which do you prefer and why?
Wall A
Wall B
Outside: Concrete Block (4") Outside: Brick (4")
Middle: Cellulose in Wall (1") Middle: 1" air space
Inside: Plywood (5/8")
Inside: Plywood (5/8")

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?