Hot oil at a flow rate of 7.2 kg/s (average c,b) ]= 1.92 kJ/kgK) enters an existing counter-flowone to one heat exchanger at 385 K and iscooled by water entering into the shell side ofthe exchanger at 295 K (under pressure) andflowing at a rate of 4.5 kg/s and the water exittemperature is 345 K. The outside surface areais 15 m?. (Average specific heat of water is4.187 kJ/kgK)(1) Calculate the exit oil temperature.(i)(ii) Calculate the overall heat transfer coefficient.(iii) Calculate the overall thermal resistance.

Given: Inlet hot oil Temperature = T1 = 385 K Inlet water Temperature = T3 = 295 K Outlet water…

Answered: Hot oil at a flow rate of 7.2 kg/s…

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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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).
A horizontal steam pipe has an outer diameter of 8.9 cm and passes through a large room whose walls are at 293K. The pipe wall has a temperature of 410 K and an emissivity of 0.85. The air temperature in the room is 296 K. Calculate the rate of heat loss per unit length from the pipe by radiation and natural convection. Ans. 281 W/m of pipe by radiation; 217 W/m of pipe by convection.
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.
Hot oil is to be cooled in a double- tube counter- flow heat exchanger. The copper inner tubes have a diameter of 2 cm and negligible thickness. The inner diameter of the outer tube (the shell) is 3 cm. Water flows through the tube at a rate of 0.5 kg/ s, and the oil through the shell at a rate of 0.8 kg/ s. Taking the average temperatures of the water and the oll to be 45°C and 80°C, respectively, determine the overall heat transfer coefficient of this heat exchanger. Use the Table 1 if needed. The properties of water at 45 °C are as follows: Pr = 3.91 m2/s Kinematic viscosity, v = 0.602 x 10-6 p= 990.1 kg/m3 The properties of oil at 80 °C are as follows: Kinematic viscosity, v = 3.794 x 10-5 k = 0.637 W/m.K Pr = 499.3 m2/s k = 0.138 W/m.K Table 1: p= 852 kg/m3 Nusselt Number for fully developed laminar flow in a circular annulus with one surface insulated and the other isothermal Di/Do Nu Nu. 0.00 0.00 3.66 0.05 17.46 4.06 0.10 11.56 4.11 0.25 7.37 4.23 0.50 5.74 4.43 1.00 4.86 4.56
A gas at 450K is flowing inside a 2-in steel pipe, schedule 40. The pipe is insulated with 51 mm of lagging having a mean k = 0.0623 W/mK. The convective heat transfer coefficient of the gas inside the pipe is 30.7 W/m²K and the convective coefficient on the outside surface of the lagging is 10.8 W/m²K. The air is at a temperature 300 K. (a) Calculate the heat loss per unit length of 1 m of pipe using resistances (b) Repeat using the overall Uo based on the outside area Ao.
Hollow Sphere Saturated steam at 267°F is flowing inside a hollow sphere with an ID of 0.824 in. and an OD of 1.05 in. The pipe is insulated with 1.5 in. of insulation on the outside. The convective heat transfer coefficient inside and outside the pipe is hi = 1000 Btu/hr/ft2/°F and ho = 2 Btu/hr/ft2/°F, respectively. The mean thermal conductivity of the metal is 45 W/m/K or 26 Btu/hr/ft/°F, while that of the insulation material is 0.064 W/m/K or 0.037 Btu/hr/ft/°F. a. Calculate the heat loss for 1 ft of pipe using resistances if the surrounding air is at 80°F. b. Calculate the temperature profile developed for this system. c. Calculate the inside and outside overall heat transfer coefficients.
Number 3 A food product with 73% moisture content in a 5 cm diameter can wants to be frozen. The density of the product is 970 kg / m³, the thermal conductivity is 1.2 W / (m K), and the initial freezing temperature is -1.75 ° C. After 10 hours in the freezing medium -25 ° C, the product temperature becomes -10 ° C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder. identify: a. h = Answer in W / (m² K).
2. The wall of a furnace is made up of a material which has thermal conductivity of 1.65 W/m•C and a thicknesses 250 mm. The inner side of the furnace wall is exposed to hot gases at 1000 °C with a convection coefficient of 25 W/m2°C and the inside the surface is at 800 °C. The air outside the furnace is at 25°C with a convection coefficient of 12 W/m2°C. a. Draw a clear diagram representing the system b. Determine the temperature of the outside surface of the furnace C. The rate of heat loss from the furnace.
Pls provide a complete and step by step solution. TY!
Problem 3 A novel material is suddenly exposed on one side to a fluid material. The material has an overall thermal gradient of °C W -7,000 with a thermal conductivity of 23.8. The fluid m m.K • has a temperature of 30° C and a heat transfer coefficient of 325 W m². K. material. . Calculate the temperature at the surface of the
A food product with 73% moisture content in a 10 cm diameter can wants to be frozen. The density of the product is 970 kg / m³, the thermal conductivity is 1.2 W / (m K), and the initial freezing temperature is -2.5 ° C. After 14 hours in the freezing medium -40 ° C, the product temperature becomes -10 ° C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder. h = Answer W / (m² K).
Hot brine from a geothermal well passes through 120 3 cm-O.D., 1 mm-wall- thickness, 16 m-long titanium alloy (k = 14 W/m K) tubes. Refrigerant-113 boils on the exterior of the tubes at 150°C, with an outside heat transfer coefficient of 20,000 W/m² K. The hot brine enters the tubes at 210°C, and the bulk velocity in each tube is 2 m/s. Calculate the following quantities. (i) Rep, the Reynolds number inside a tube (ii) hei, the inside heat transfer coefficient (iii) U, the overall heat transfer coefficient

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