STP and Cooling


Take Home Midtest Oct 16, 2017
Introduction to Mechanical Engineering

Facilitator : Raldi A. Koestoer

Write in the first case above, Your Name, NPM, Email, Mobile Phone No., Group No.

Conditions: This take home midtest must be done individually. Open book, open note, open internet, it is forbidden to copy-paste.

Date issued Monday 16/10/17 at 08.00. Should be collected from the classroom (every student) direct to the  coordinator and then coordinator to teacher Wednesday 18/10/17 at 16:00. Working with 12 points MSWord Times N Roman typeface. Late submission paper, will be rejected.

Problem 1 (20%)
Explain briefly (0,5-1 page) what do you want to do after completing your studies at UI, in other words what profession you choose just after graduation. Furthermore, what’s your dreams or what would be your goal in the next 15 years (what do you want to be?).

Problem 2 (45-50%)
Power Plant (Steam Power Plant) is an installation for generating electrical energy then the energy will be transmitted and distributed all over the city and the countryside. Fuels used include coal, diesel (HSD) or gas.

(A) Explain with figure of ‘magic square’ as we discussed in the class, the working principle of this power plant, with four main components.

(B) Explain in detail with your own words, complete with figures or schematics illustration,the  functions and the working principles of  the following  components. See the last digit of your NPM (Student’s number). If your last digit include or in between of: 0-3: please choose BOILER and SUPERHEATER, 4-6  TURBINE System, 7-9 CONDENSER system..

(C) Superheated steam passed through the nozzle and pushed the turbine blade. What is the thermodynamic parameter important in this case that make the turbine rotate. Explain and elaborate your understanding.

Problem 3 (30-35%)
Explain with figure

  • How a mechanical refrigeration cooling system works with four main components (Compressor, Condenser, Expansion valve, Evaporator).
  • Fill in your group’s data sheet on the measurement of home refrigerator system. T means the temperature. Depict the freezer in the upperside then continue by tray #1 #2 #3. . Make a table of T and please illustrate the result in graphic.
  • A special working fluid is being used in the system, generally called refrigerant (some say ‘Freon’), why you should use such a strange working fluid on the system, why don’t use only water as the working fluid.
  • Now use your logical thingking to answer the following questions: Why the freezer or icebox is always located in top  upperside ?  (Why don’t they put in the bottom ?).