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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
calculate the required diameter of a 3 m long stainless steel annealed rod subjected to an axial tensile load o f 67
A pipe with OD 6.03cm, ID 4.93cm carries steam at 250deg C with h = 200 W/m^2.K The pipe is covered with 2.5cm of magnesia (85%) insulation followed by 2.5cm of polystyrene (k = .025 W/m.K The outer surface is exposed to air at T = 20 deg C with h = ..
water is the working fluid in a regenerative rankine cycle. the pressure and temperature at the turbine inlet are 8mpa
modified brayton cycle is to be analyzed using the air-standard assumption with constant specific heats at a
A pump is used to raise the pressure of water from 0 psig to 55 psia. How much power (in kW) will be required to pump 1.5ft3/s of water? What is the effect of the water temperature on the pump power that is required?
three wires are made of the following materials. one wire is pure al. one wire is pure cu. one wire is pure ni. which
atmospheric air at 98 kpa and 30degc flows into an air conditioning system with a volume flow rate of 2 m3min. to
The spool has a mass of 75 kg and a radius of gyration . It rests on the inclined surface for which the coefficient of kinetic friction is . If the spool is released from rest and slips at A, determine the initial tension in the cord and the angul..
Sea water (p=1025 kg/m3) flows through a pump at 0.21 m3/s. The pump inlet is 0.25m in diameter. At the inlet the pressure is -0.15 in of mercury. The pump outlet, 0.152 m in diameter, is 1.8 m above the inlet. The outlet pressure is 175 kPa. If the ..
a window air conditioner that consumes 1 kw of electricity when running has a coefficient of performance of 3 is placed
A tank of CO2 has a volume of 0.15 m^3, contains 0.8 kg of CO2 at a pressure of 453.4 kPa. 10% percent of the mass is removed in such a way that the pressure falls to 371.8 kPa. Determine the internal energy change for this process.
A well-insulated rigid tank contains 1 kg of air at 30°C. A paddle wheel rotates inside the tank and increases the temperature of the air to 60°C. If the environment is at 100 kPa and 25°C, determine the exergy destroyed and the minimum work input fo..
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