It is desired to cool an organic liquid from 65oC to 40oC using water as cooling medium. The organic liquid shall enter 5m/s and at the average temperature its properties are: density = 810 kg/m3, viscosity = 1 cp, specific heat = 2.1 KJ/kg-K and thermal conductivity = 0.14 W/m-K. The cooling water shall enter at 28oC and leave at 35oC. Suppose a double pipe heat exchanger composed of 1 inch and 2 inch sch 40 Steel pipes are used. Determine the length of the exchanger needed (m) for (a) counter-current flow (b) co-current flow.

Example • The cylinder is made from aluminum with diameter and thickness of 5 cm and 1 cm respectively. The wall temperature in the inside of cylinder is 50°C, while the temperature of the air is 30°C. the coefficient of convection in the air is 10 W/m2-C. Calculate the heat loss from the cylinder per unit length! • Calculate the thickness of the insulation so heat loss from cylinder will decrease 50% of initial condition. Thermal conductivity of the isolator (k) : 0.5 W/m°C state.pptx 7 MB VIEW Tampilkan semua

1. A plastic (k = 0.5 W/m K) pipe carries a coolant at -35 °C with a heat-transfer coefficient of 300 W/m².K. The pipe ID is 3 cm and the OD is 4 cm. The exterior pipe surface is exposed to air at 25°C with a heat-transfer coefficient of 20 W/m²K. Radiative heat transfer may be neglected in this problem. (a) Calculate the rate of heat transfer to the coolant per meter of pipe length. (b) Calculate the temperature of the exterior pipe surface.

À wall of area 30 m² having a density of 1500 kg/m', thermal conductivity 30 W/m.K, and specific heat capacity 4 kJ/kg.K. The temperature distribution across a wall 0.5 m thick at a certain instant of time is given as T(x) = 30-5 x-7x The wall is generating a uniform heat (q.) of 1000 W. (1) Find the rate of heat transfer entering and leaving the wall (in W). (2) Find rate of energy stored in Watt. (3) Find (dFT/dx²) (4) Derive the change in temperature with respect to time equation (time rate of temperature change)- remember to substitute the value of (d T/dx²) from (part 3) and values of all other properties into final equation. %3D

Transport Phenomena Question

A copper electric wire of radius R, = 1 mm is isolated by a layer of PVC so that the outer radius of the wire Rg = 2 mm, as shown in Figure below. The wire exchanges heat with the air at 20°C according to a heat transfer coefficient h=20 W/m2°c: Given that : k=copper electrical conductivity=4.0 × 1070hm-'m¯! kpvc= PVC thermal conductivity = 0.3- m°C kco = copper thermal conductivity = 100 m°C %3D (amp/m)² And that the electrical heating source is given by : S, amp²s /kgm³ If the temperature (T,) on the outer surface (r = RG) is 25°C, what is the electrical current C (amp) that passes through this wire? Dont forget to state your hypothesis clearly.     Hi, Could you please tell me what the book's name is? Thank you!

Choose the word from the word bank below that best matches each statement. Constant Equilibrium Increases Temperature Chemical Endothermic Reactant Closed system Exothermic Reversible 6. When writing an endothermic reaction, heat energy is stated as a 7. The double-headed arrow indicates that a reaction is 8. A chemical reaction that absorbs energy is an 9. A chemical reaction that releases energy is an 10. Le Chatelier's Principle states that the equilibrium of a will shift so as to relieve the stress, thereby restoring equilibrium. J