The recycle ratio (ft³ recirculated/ft³ exhausted) is 2:1. Calculate the condensation rate and the overall cooling requirement in tons if conditioned air is delivered at the same rate, temperature, and relative humidity as in the first part. What percentage of the cooling load on the air conditioner is saved by recirculating the air? Condensation rate: i Ibm/min Cooling load: i tons Percentage savings: i

Estimate the thermal conductivity of tomato juice at 35 ° C. (Water content = 87.0% wet basis). Thermal conductivity of material = AnswerW / m ° C

Heat Conduction The wall (thickness L) of a furnace, with inside temperature 800° C, is comprised of brick material [thermal conductivity = 0.02 W m-¹ K-¹)]. Given that the wall thickness is 12 cm, the atmospheric temperature is 0° C, the density and heat capacity of the brick material are 1.9 gm cm-³ and 6.0 J kg ¹ K¹ respectively, estimate the temperature profile within the brick wall after 2 hours. Solve the partial differential equation ƏT = pc at Ə əx (NOT) k subject to the initial condition TX 2L and = T(x,0) = 800 sin and boundary conditions at the inner (x = L) and outer (x = 0) walls of T = 0 x = 0 = 0 ƏT at x = L əx Find the temperature profile at T = 7200 seconds at = 2 hours.

One side of a copper block 5 cm thick is maintained at 250°C. The other side is covered with a layer of fiberglass 2.5 cm thick. The outside of the fiberglass is main- tained at 35°C, and the total heat flow through the copper-fiberglass combination is 52 kW. What is the area of the slab?