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Most of the energy we consume as food is converted to thermal energy in the process of performing all our bodily functions and is ultimately lost from our bodies. Consider a person who consumes 2100 kcal per day (note that what are commonly referred to as food calories are actually kilocalories), of which 2000 kcal is converted to thermal energy. The remaining 100 kcal is used to do work on the environment. The person has a surface area of 1.8m2 and is dressed in a bathing suit.
a. The person is in a room at 200C, with a convection heat transfer coefficient of 3 W/m2K at this air temperature, the person is not perspiring much.Estimate the person's average skin temperature.
b. If the temperature of the environment were 33o C, what rate of perspiration would be needed to maintain a comfortable skin temperature of 33o C?
a vapor compression refrigetarion cycle has a theoretical cop of 4.8 and provides 120000 btuh of cooling. the
A jack-screw has a handle 35 inches long and a pitch of 7/32 inches. If a pull of 15 lbs. is required at the end of the handle to lift a 3,000 lbs.
a gas turbine can assume an ideal brayton cycle has a pressure ratio of 10. it is connected to an electric generator
Investigating A Dynamic Movement in Polar Coordinates
Determine the turbine inlet temperature, the cycle thermal efficiency, and the back-work ratio of this cycle.
i need you to write a report about precipitation hardening of aluminum alloys. i will attach the report format which
design a computer programme using freudestein equation to synthesise a four bar linkage using three precision points also using more than three points.
What happens to the cutting and thrust force as tool rake angle and cutting speed are increased and what is the relation between the cutting and thrust forces to the depth of cut?
using a 3 flute solid carbide 20mm diameter slot drill. with feed rate of 0.175mmtoothrev at a depth of cut of 12mm and
Steam at 15 bar and 350 degrees C is expanded through a 50% reaction turbine to a pressure of 0.14 bar. The stage efficiency is 80% for each stage and the reheat factor is 1.05.
what is the sine wave generated by a phasor of length 9, rotating with an angular velocity of 325 rad/s; and with the phase angle of 0."
explain the factor, which inhibit the use of a very high resolution and a large number of colors for display in the case of raster scanning display devices.
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