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Humans are able to control their heat production rate and heat loss rate to maintain a nearly constant core temperature of under a wide range of environmental conditions. This process is called Thermoregulation. From the perspective of calculating heat transfer between a human body and its surrounding, we focus on a layer of skin and fat, with its outer surface exposed to the environment and its inner surface at a temperature slightly less than the core temperature, . Consider a person with a skin/fat layer of thickness and effective thermal conductivity . The person has a surface area and is dressed in a bathing suit. The emissivity of the skin is .When the person is in still air at and the convection heat transfer to the air is characterized by a free convection coefficient of ,a) Express the energy balance at the skin surface in function of the heat transfer three modesb) Determine an equation for the skin surface temperaturec) By linearizing the radiation term by , evaluate the skin surface temperature ford) Determine the rate of heat loss to the environmente) Repeat parts c) and d) without linearizationWhen the person is in water at , what is the skin surface temperature and heat loss rate? Heat transfer to the water. Note that liquid water is opaque to thermal radiation and heat loss from the skin surface is only by convection with a convection coefficient
a shrink fit assembly is to be performed on a pin and collar. with the starting dia. being 0.875 the pin needs to be
a w16 x 50 steel beam supports a uniform load and a concentrated load. the distributed load is 1.5 kipft and
Oil flows at a rate of 12gpm from a vented tank (pressure at point 1 is zero) through 1 inch inner diameter pipes and elbows, and through a pump and motor as shown. The pump adds HHPp= 3hp to and the motor extracts HHPm= 1hp from the fluid power.
A 4 pole, 9 coil, simplex wave wound machine with 20 turns per coil is rotating in a field of 3T, and pole area of 100cm2. Find the maximum torque generated from a 100V source, and an armature resistance of 1 ?. Find the current, if the machine has b..
the drinking water needs of a residential hall with 20 students is to be met by a bubbler type water fountain. the
Teresa measures the distance that a traverse system moves an object for a given computer-controlled input pulse. She makes 100 readings, and the mean value is 6.832 m with a sample standard deviation of 1.0 cm. The errors in the measurements are assu..
consider an electrolytic cell for producing hydrogen and oxygen mi h2so4 0.5mmii where mi and mii are carbon rods. a
tom and jim are kicking a ball which has a mass of 490g back and forth. tom kicks the ball with a speed of 5ms
Calculate the time evolution for a population of burning particles. Assume that the surface area burning rate, f, is 0.5 mm2 /min. Assume a diameter interval Di = 0.2 mm centered around the following diameters di with specified fuel feed rate dist..
water at 20degc flows past a circular cylinder in cross-flow at a freestream velocity of 0.5 ms. the cylinder is 0.02m
a car is moving with a constant speed of 40 kmh along a straight road which heads towards a large vertical wall and
Discuss in detail how the various thermal, visual and auditory factors can affect the comfort of the users of these spaces. State clearly any acceptable parameters that are relevant in your discussion. Justify the values you have stated.
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