Consider steady-state conditions for one-dimensional conduction in a plane wall having a thermal conductivity k = 40 W/m-K and a chickness L = 0.3 m, with no internal heat generation. T2 L Determine the heat flux, in kW/m2, and the unknown quantity for each case.

IP Heat Transport in the Human Body The core temperature of the human body is 37.0 ∘C∘C, and the skin, with a surface area of 1.40 m2m2, has a temperature of 34.0 ∘C∘C.   Find the rate of heat transfer out of the body under the following assumptions: (i) The average thickness of tissue between the core and the skin is 1.20 cmcm; (ii) the thermal conductivity of the tissue is that of water.         Express your answer using two significant figures.        Without repeating the calculation of part A, what rate of heat transfer would you expect if the skin temperature were to fall to 31.0 ∘C∘C? Express your answer using two significant figures.

An apple is placed in a freezer at -15 ° C. In the beginning, the heat transfer rate on the surface of the apple with a uniform temperature of 20 ° C is 8 W / m2 ° C. Taking the apple as a 9 cm diameter sphere and taking the physical properties p = 840 kg / m2, c, -3.81 kJ / kg ° C, k-0.418 W / m ° C and a = 1.3 * 107 m2 / s, after 65 minutes ) calculate core (° C) and b) surface temperatures (° C).

A hot fluid (60° C) flows inside an copper tube with 1.7 cm OD and 1.5 cm ID. The inside of the pipe has a heat transfer coefficient of 130 W/m2-K. The tube is exposed to a room with air and surrounding walls of 23° C. The heat transfer coefficent between the outside of the walls and the room air is 15 W/m2 K. Draw an equivalent circuit diagram of the heat transfer, and quantify the resistance to heat flow by each of the two convective processes, conduction in the tube, and radiation between the outside of the tube and the room walls. Are any of the resistances negligible to the overall heat transfer, and if so, which ones?

Calculate the spring constant, k, in kN/m.

Choose all applicable cases from the list below where the total system energy is conserved. O isolated system closed system closed system with Q = W closed system with Q = 0 closed system with W = 0 closed system with Q = 0 and W = 0

As the temperature increases, the thermal conductivity of a gas... (A) increases (B) decreases (C) remains constant (D) increases up to a certain temperature and then decrease

Consider the rate of conductive heat transfer from the inside of an animal’s body (at 37 ˚C) tothe cooler surroundings (initially at 22 ˚C). Order the following from lowest to highestimpact. Justify your answer. The outside temperature increases to 27 ˚CThe thermal conductivity of the animal’s insulating layer is doubledThe thickness of the animal’s insulating layer is halvedThe volume of the animal is doubledThe surface of the animal becomes coated in an extremely thin layer of black oil

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