Question 1.2A helical coil cooler is used to cool 0.5 kg.s¹ of hot oil from 100°C down to 40°C. Coolingwater with an inlet temperature of 10°C flows inside the coiled tube. The specific heat of theoil is 2 kJ.kg¹.K¹, the specific heat of the water is 4.2 kJ.kg¹.K¹, and the density of water is1000 kg.m.a) Determine the lowest possible cooling water flow rate.(0.48 kg.s¹)b)Determine the inside diameter of the tube if a cooling water flow of 1.5 times the minimumis used, and the recommended flow velocity is 1 m.s. Select an appropriate tube fromthe following standard sizes:Outside diameter (mm)Wall thickness (mm)301.5352.0402.0452.5503.0c) For a heat transfer coefficient of U = 800 W.m2.K, determine the heat transfer surfacearea and the tube length of the heat exchanger. The oil inside the tank is mixed by astirrer and the oil temperature at any location in the tank can be assumed to be equal tothe oil outlet temperature.(Area = 4.12 m², length = 39.7 m)

Hot oil flow rate (mo) = 0.5 kg/sOil inlet temperature (Ti) = 100 °COil outlet temperature (To) = 40…

Answered: A helical coil cooler is used to cool…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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1. Assume steady-state conditions and a thermal conductivity of k 1.5 W/m-K. a. Determine the temperatures at nodes 1, 2, and 3 b. Determine the heat transfer rate/(unit thickness into the page) from the system to the convective fluid. Insulated boundary 129.4 T2 45.8 T = 30°C h = 50 W/m2-K 0.1 m T3 137.0 103.5 0.1 m 172.9 T1 132.8 67,0 Isothermal boundary To = 200°C
NEED FAST, COMPLETE. Ans in SI unit
Calculate the heat loss from a double-pane glass window consisting of two pieces af glass, each having a thickness of 10 mm with a thermal conductivity of k- 1.3 The two glass panes are separated by an air gap of 7 mm. Assume thermal conductivity of air to be k = 0.022- State your assumptions if there are any.
Example 2.8 A 2.8-mm diameter and 15-m long electric wire is covered with a 2.2-mm layer of insulation having thermal conductivity of 0.06 W/m.K. The electric current generates heat at the rate of 115 W. The wire is exposed to an environment at 20°C and a natural convection coefficient of 7 W/m₂K. What will be the temperature at the surface of the pipe? Determine the maximum extra insulation that can be added to enhance cooling.
A 5 cm thick steel pipe, 1.0 m long, with an internal diameter of 8 cm is covered with 4 cm thick insulation. The inside wall temperature of the steel pipe is 100°C. The ambient temperature around the insulated pipe is 24°C. The convective heat-transfer coeffi cient on the outer insulated surface is 50 W/(m² K). Calculate the temperature at the steel insulation interface. The thermal conductivity of steel is 54 W/(m K), and the thermal conductivity of insulation is 0.04 W/(m K).
400 circumferential fins of rectangular profile (k = 386 W/m °C) are installed on a tube having a diameter of 3 cm and 1 m length that is maintained at a temperature of 200°C. The single fin has a length of 2 cm and a thickness of 0.7 mm. The heat is transferred to the surrounding air at 100°C with a convection heat-transfer coefficient of 524 W/m² °C. How many times is the heat transfer rate enhanced when the fins are installed on the tube?
A pipe has a 120 °C inside surface temperature, 10 cm inside diameter, 6 mm wall thickness and 30 W/m °C of thermal conductivity. This pipe is covered by an 8 cm layer of insulation with a thermal conductivity of 0.6 W/m°C, and then followed by a 5 cm layer of insulation with thermal conductivity of 0.3 W/m°C. Ambient air temperature which completely surrounds the system is 20 °C. Calculate the heat loss per meter of length of the pipe, and also the surface temperature of the second insulation layer which is in contact with ambient air if the length of the system is 2 meters.
Liquid food is heated in a tubular heat exchanger. The inner pipe wall temperature is 110 ° C. The internal diameter of the pipe is 40 mm. Product flows at 0.7 kg / s. If the initial temperature of the product is 7 ° C, calculate the convective heat transfer coefficient. The thermal properties of the product are as follows: specific heat = 3.7 kJ / (kg ° C), thermal conductivity = 0.6 W / (m ° C), product viscosity = 500 x 10-6 Pa s, density = 1000 kg / m³ , the product viscosity at 110 ° C = 410 x 10-6 Pa s. a. Find the Reynold number = Answer. b. Find the number Prantl = Answer. c. Find the Nuselt = Answer number d. Convection coefficient = AnswerW / m² ° C.
A saucepan 30 cm in diameter is placed on the stove. The pot is made of stainless plate (k = 15 W / [m ° C]), and contains boiling water at 98 ° C. The bottom of the pot is 0.8 cm thick. The surface temperature in the bottom of the pan in contact with water is 105 ° C. a. If the heat transfer rate through the bottom of the pan is 600 W, determine the temperature of the outside surface of the pan that is exposed to the heating stove. = Answer ° C. b. Find the convective heat transfer coefficient of boiling water = Answer W / m2 ° C
The circular base, 4 mm thick, of a pan with a diameter of 150 mm can be made of materials with different thermal conductivities. When used to boil water, the surface of the base exposed to water is at 105.0 ° C. Heat is transferred from the stove to the pan at a rate of 1400 W. What is the temperature of the surface facing the stove? Consider that the thermal conductivity (in W / (m · K)) of this container is equal to k = 238 W / (m · K)) Provide the answer in ºC to one decimal place
A gas at 500 K is flowing inside a 2-in schedule 40 steel pipe. A cork board insulation of 25 mm thickness covers the steel pipe. The convective heat-transfer coefficient of the gas inside the pipe is 26.5 W/m2-K and the convective coefficient outside the cork board is 16.5 W/m2-K. The surrounding temperature is at 298.15 K. Calculate the heat loss per unit length of 1 m of pipe using resistances, and compute for the U, based on the outside area Ag.
Water flows through a pipe at an average temperature of 7-50°C. The inner and outer radii of the pipe are r,6 cm and ry - 6.5 cm, respectively. The outer surface of the pipe is wrapped with a thin electric heater that consumes 300 W per m length of the pipe. The exposed surface of the heater is heavily insulated so that the entire heat generated in the heater is transferred to the pipe. Heat is transferred from the inner surface of the pipe to the water by convection with a heat transfer coefficient of h55 W/m2 °C. Assuming constant thermal conductivity and one-dimensional heat transfer, express the mathematical formulation (the differential equation and the boundary conditions) of the heat conduction in the pipe during steady operation. Do not solve.. 2 5:46

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