asapp 2nd wall has a al Steady state heat transfer thru a 3 layered wall. 1st...
Help mee!! Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe of 0.1 m inside diameter at a flow rate of 0.2 m/h and at an average temperature of 70 °C. The pipe length is 2.5 m and the inside pipe wall temperature is 60 °C Assume that the pipe thickness is small and the steel heat conductivity is high enough so that the thermal resistance of the pipe wall is negligible. Calculate: (a) The...
A concrete wall of a house is 45 cm thick and has a surface area 20m x 5 m. The inside temperature of the wall is 47 °C and the outside air temperature is 14 °C. Thermal conductivity of the concrete wall is 0.8 W/mK. Calculate the heat transfer rate through the wall by conduction and its thermal resistance.
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2) through a plane wall of thickness 8, surface area A and the thermal conductivity k. The thermal resistance for the set up is + (a) AC ) (b) A (i + + ) (c) 2 (na + + n2) (d) A (na + b +h2) (2 pts) An increase in convective heat transfer coefficient over a fin will (a) increase effectiveness (b) decrease effectiveness...
1. A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated below. On a cold winter day the convection heat transfer coefficients are ho = 60 W/m2K and hi = 30 W/m2K. The total wall surface area is 350 m2. (a) Determine the heat transfer rate through the wall in Watts. (b) If the wind were blowing violently, raising ho to 300 W/m2K, determine the percentage increase in the heat transfer rate. (c) What is...
4. A wall, 4 m wide in steady-state experiences uniform volumetric heat generation " = 300 , shown in Figure 1. The wall has constant thermal conductivity k=5 and is exposed to air T = 293 K on both sides. At x=L: T(L) = T2 = 300 K, and h2 = 120 At r= -L: T-L) = T. (a) Determine the temperature distribution T(x) in the wall. Partial Ans: C = -240 (b) What is the temperature (in K) at...
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6 m * 3.0 m) with a heat transfer coefficient of 255 W/m2K. On the other side of the heat exchanger wall a gas flows, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high (k = 3 W/m K) as shown in the figure below. The fins are 3 m long and the heat transfer...
Question 11 (15 points) The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6 m * 3.0 m) with a heat transfer coefficient of 255 W/m2 K. On the other side of the heat exchanger wall a gas flows, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high (k = 3 W/m K) as shown in the figure below. The fins are 3 m...
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6 m 3.0 m) with a heat transfer coefficient of 255 W/m2K. On the other side of the heat exchanger wall a gas flows, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high (k = 3 W/m K) as shown in the figure below. The fins are 3 m long and the heat transfer coefficient...
ncat transfer system. Question 3-30 points The steady-state temperature distribution in a one-dimensional wall of 20 W/m-K and thickness L 20 cm is of the form T(x) Ax Bx +Cx + D, where A 20 Crn, B-l 50°C/㎡, C =-120°C/m, D-200 ℃ Find (i) the heat generation rate per unit thermal conductivity, k
Heat Transfer Question Answer is given. Please show all work and how to reach the answer. 3.57 A composite cylindrical wall is composed of two materials of thermal conductivity k and kp, which are separated by a very thin, electric resistance heater for which interfacial contact resistances are negligible. Resistance heater r2 Internal flow T h A Ambient air T h Liquid pumped through the tube is at a temperature Ta and provides a convection coefficient h, at the inner...