Q1: A rotary countercurrent dryer is fed with ammonium nitrate containing 5%moisture at the rate of 1.5 kg/s, and discharges the nitrate with 0.2% moisture. The airenters at 405 K and leaves at 355 K; the humidity of the entering air being 0.007 kgmoisture/kg dry air. The nitrate enters at 294 K and leaves at 339 K.Neglecting radiation losses, calculate the mass of dry air passing through the dryer andthe humidity of the air leaving the dryer. Latent heat of water at 294 K = 2450 kJ/kg.Specific heat capacity of ammonium nitrate = 1.88 kJ/kg K. Specific heat capacity ofdry air = 0.99 kJ/kg K. Specific heat capacity of water vapor = 2.01 kJ/kg K.

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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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The plot to the right shows the 1-D steady-state solution to the Pennes bioheat equation with T = 37°C at x = 0 (body core) and T = 43°C at x = 0.01 (body surface). The thermal conductivity is 0.5 W m-l °C-'. This scenario describes some surface tissue thermal conductivity (WI(m°C)) 0.5 blood perfusion rate (1/5) T("C) 43 heating (e.g., laser). Which trace represents the highest value of the blood perfusion rate. 42 41 A 40 А. А В. В 39 38 E С.С 0.002 X(m) 0.010 0.004 0.006 0.008 D. D Е. Е
plz write neatly, do not copy and paste solution
Answer: 24.187 °C
Formaldehyde at 52.688 bar and 175.65 ℃ passes through a heater-expander and emerges at 39.516 bar and 420.45 ℃. There is no work into or out of the heater, but heat is supplied. Calculate the heat transfer into the heater-expander per mole of formaldehyde
1. (a) Hot oil at a flow rate of 5.5 kg/s (average cp = 1.92 kJ/kgK) enters an existing counter-flow exchanger at 435 K and is cooled by water entering at 325 K (under pressure) and flowing at a rate of 7.2 kg/s and the water exit temperature is 350 K. The overall heat transfer coefficient based on the outside area is 685 W/m²K (Average specific heat of water is 4.187 kJ/kgK). (i) Calculate the exit oil temperature. (ii) Calculate the heat transfer area. (b) The fluid in (a) enters an existing co-current-flow exchanger at the same conditions. (i) Calculate the heat transfer area. (ii) Explain the performance of both heat exchangers.
4. The right figure shows a simple combustion calorimeter. The sample is ignited electrically. After a few minutes the temperature of the water and calorimeter is constant at AT higher than the starting temperature. Determine the heat of combustion of a sample from the following data: Sample mass Calorimeter mass Water mass 4 g 500 g 5000 g The heat of combustion is defined as = Sample Inlet 0 75 400 Temperature °F 70.0 Cvcalorimeter Cywater Ufinal products of combustion Pressure, psig Elevation, ft Velocity, ft/s AT Stirrer Uinitial fuel+oxygen Au combustion msample 5. A steady-flow water power plant has the following inlet and outlet conditions: Oxygen Outet 0 0 50 70.1 Water Thermometer Heavy steel bomb 0.12 cal/g °C 1.0 cal/g °C 5 °C
Stefan-Boltzman law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in °K) A. +4 T4 B. C. D. O 1 t4 1 T4
2. A piston-cylinder device initially contains 0.8 kg of nitrogen gas at 160 kPa and 240 °C. The nitrogen gas is now expanded to a pressure of 100 kPa isothermally. Determine the work boundary during this process. 3. A frictionless piston-cylinder device contains 6 kg vapor at 600 kPa and 400 °C. When heat is transferred to the system, the vapor temperature is increasing up to 500 °C. Calculate the work net during this heat transfer process.

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