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The wall of a refigerator is constructed of fiberglass insulation (K=0.035W/moC) sandwiched between two layers of 1mm thick sheet metal(K=15.1W/moC). the refrigerated space is maintained at 3oC, and the average heat transfer coefficients at the inner and outer surfaces of the wall are 4W/m^2oC and 9W/m^2oC respectively. The kitchen air is at average temperature of 25oC. It is observed that condensation occurs on the outer surfaces of the refrigerator when the temperature of the outer surface drops to 20oC. Determine the minimum thickness of fibreglas insulation that needs to be used in the wall in order to avoid condensation on the outer surfaces.
What is the composition, in atom percent, of an alloy that consists of 5.5 wt% Pb and 94.5 wt% Sn?
Advanced Stress Analysis
Aim of this demonstration is to use measurements of the load required to propagate a crack (tear) in packaging tape to determine its fracture toughness and Describe the fracture behaviour of the insulation tape loaded with a small crack. Explain w..
what is the specific volume, internal energy (kj/kg) and enthalpy (kj/kg) for water at 1.8 mpa and 120 Degrees C? Locate the state on p-v diagram and document assumptions.
your job is to create a design of Rankine cycle that create the most possible power from this heat source . you may use any working fluid for which you can find the properties , assume the turbines 92% efficient and pumps 85%
Steady State Thermal analysis can be use to simulate and obtain results to support the design optimization / objectives
Examine the influence of the vibration on the grain size, microstructure and mechanical properties of aluminium-silicon alloys (Al-Si) during solidification.
Classify the sections of the components in automatic control system.
Evaluate the reduction in pump BHP required by heating the oil from 50° F to 100° F. Suppose efficiency of 80% (HP)
Focus mainly of consumer items such as iPods, coke bottles, running shoes
Vector integral - stokes therom, Evaluate the line integral by stokes theorem (clock wise as seen by a person standing at the origin).
If the maximum temperature in the cycle is not to exceed 2200 K, determine the thermal efficiency and the mean effective pressure.
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