Engineering, 12.11.2019 02:31, amorosoavap5cejz
For heat transfer purposes, a human body can be modeled with a layer of skin 3-mm thick which inner temperature (slightly less than the core temperature) of 35o c and thermal conductivity of 0.3 w/m k. to reduce the heat loss rate, a person wears special sporting gear (snow suit and wet suit) made from nanostructured silica aerogel insulation with an extremely low thermal conductivity of 0.014 w/m k. the emissivity of the outer surface of the snow and wet suits is 0.95. assume a person has a surface area of 1.8 m 2 and is dressed in a suit. take the surrounding and air temperature to be both at 10o c with convection coefficient of 2 w/m2 k for air and 200 w/m2 k for water. what thickness of aerogel insulation is needed to reduce the heat loss rate to 100 w (a typical metabolic heat generation rate) in air and water? what are the resulting skin temperatures?
Answers: 2
Engineering, 04.07.2019 19:10, jimena15
10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.
Answers: 2
Engineering, 04.07.2019 19:10, lexie223
Acircular aluminum shaft mounted in a journal is shown. the symmetric clearance gap between the shaft and journal is filled with sae 10w-30 oil at t 30°c. the shaft is caused to turn by the attached mass and cord. develop and solve a differential equation for the angular speed of the shaft as a function of time.
Answers: 2
For heat transfer purposes, a human body can be modeled with a layer of skin 3-mm thick which inner...
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