Common practice in chemical processing plants

Assignment Help Mechanical Engineering

Reference no: EM13946214

Common practice in chemical processing plants is to clad pipe insulation with a durable, thick aluminum foil. The functions of the foil are to confine the batt insulation and to reduce heat transfer by radiation to the surroundings. Because of the presence of chlorine (at chlorine or seaside plants), the aluminum foil sur- face, which is initially bright, becomes etched with in-service time. Typically, the emissivity might change from 0.12 at installation to 0.36 with extended service. For a 300-mm-diameter foil-covered pipe whose surface temperature is 90°C, will this increase in emissivity due to degradation of the foil finish have a significant effect on heat loss from the pipe? Consider two cases with surroundings and ambient air at 25°C: (a) quiescent air and (b) a cross-wind velocity of 10 m/s.

Reference no: EM13946214

Questions Cloud

How you address such issues while ensuring project integrity : What are some of the ethical issues you might face in the capacity of a Systems Analyst?

Identify the full name of the author : Author and title: Identify the full name of the author and the title of the work. Genre: What type of writing is it (op-ed, newspaper article, magazine article, speech, book Excerpt, other)? What's it for

Should the manufacturer pay for an opinion : Calculate the breakeven point in sales dollars using the contribution margin ratio approach. How many pizzas must be sold to earn $60,000 profit per annum before tax?

Electrical heater of problem : Consider the electrical heater of Problem 7.49. If the blower were to malfunction, terminating airflow while the heater continued to operate at 1000 W/m, what tem- perature would the heater assume?

Common practice in chemical processing plants : Common practice in chemical processing plants is to clad pipe insulation with a durable, thick aluminum foil. The functions of the foil are to confine the batt insulation and to reduce heat transfer by radiation to the surroundings.

Program to convert number to words : Write a program that stores and converts a number entered in Roman numerals to an integer value. Your program must consist of a class named Roman.

Evaluate properties-appropriate film temperature : Consider the hot water pipe of Problem 7.56, but under convection coefficient as a function of only !iT = Ts - Too, where Ts is the sensor temperature. Evaluate properties at an appropriate film temperature and show what effect this approximation ..

Finite-difference method of solution : Use the finite-difference method of solution to obtain qf when the convection and radiation coefficients are based on local, rather than average, tem- peratures for the fin. How does your result compare with the analytical solution of part (a)?

Identify two risks in each of these strategies : Buy a system created for another school and modify it to fit this school's specific requirements

User Account

All Pages