An art school specializes in metal sculptures and to save money and space they don't have ametal workshop with traditional power tools and cutting torches. To make the sculptures thestudents gather scrap metal and use a specialized steamer that heats the already thin metalenough to easily bend and can be used inside around other flammable materials as it is steampowered. The steamer creates the steam and then heats it through a funnel from 100 to 450 °C.Use steam tables to find what the heat input in Watts (W) of the funnel is if a continuous streamof steam at a rate of 50 kg/s undergoes the heating process at a constant pressure.Assumption: We are assuming that the P(bar) of saturation is at 0.1 for our steam tables

Answered: Assumption: We are assuming that the…

Engineering

Mechanical Engineering

Assumption: We are assuming that the P(bar) of saturation is at 0.1 for our steam tables

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.8P

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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

An art school specializes in metal sculptures and to save money and space they don't have a
metal workshop with traditional power tools and cutting torches. To make the sculptures the
students gather scrap metal and use a specialized steamer that heats the already thin metal
enough to easily bend and can be used inside around other flammable materials as it is steam
powered. The steamer creates the steam and then heats it through a funnel from 100 to 450 °C.
Use steam tables to find what the heat input in Watts (W) of the funnel is if a continuous stream
of steam at a rate of 50 kg/s undergoes the heating process at a constant pressure.
Assumption: We are assuming that the P(bar) of saturation is at 0.1 for our steam tables

Expert Solution

Step 1

Given:

The streamer creates the steam at a pressure of 0.1 bar from 100 to 450 ^oC. and the mass flow rate of steam is 50 kg/sec.

From the Steam Table determine the properties of steam,

$A t P = 0.1 b a r, T_{s} = 99.606 ° C, A t P = 0.1 b a r a n d T = 100 ° C S p e c i f i c e n t h a l p y o f s t e a m, h_{1} = 2675.8 k J / k g A t P = 0.1 b a r a n d T = 450 ° C S p e c i f i c e n t h a l p y o f s t e a m, h_{2} = 3382.8 k J / k g$

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