EAT223 – THERMOFLUIDS AND ENGINES


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Moderated November 2016
University of Sunderland
Faculty of Applied Sciences
Department of Computing, Engineering and Technology
EAT223 – THERMOFLUIDS AND ENGINES
Assignment 1 of 1
The following learning outcomes will be assessed:
Knowledge
Critical knowledge of the fundamental concepts and analytical methods in the solution of a range of problems related to thermodynamics, fluid mechanics, and heat transfer.
Skills
Design and analyse a variety of air standard cycles and vapour power cycles.
Important Information
You are required to submit your work within the bounds of the University Infringement of Assessment Regulations (see your Programme Guide). Plagiarism, paraphrasing and downloading large amounts of information from external sources, will not be tolerated and will be dealt with severely. Although you should make full use of any source material, which would normally be an occasional sentence and/or paragraph (referenced) followed by your own critical analysis/evaluation. You will receive no marks for work that is not your own. Your work may be subject to checks for originality which can include use of an electronic plagiarism detection service.
Where you are asked to submit an individual piece of work, the work must be entirely your own. The safety of your assessments is your responsibility. You must not permit another student access to your work.
Where referencing is required, unless otherwise stated, the Harvard referencing system must be used (see your Programme Guide).
Please ensure that you retain a duplicate of your assignment. We are required to send samples of student work to the external examiners for moderation purposes. It will also safeguard in the unlikely event of your work going astray.
Submission Date and Time
Before 4pm, Wednesday 22nd March 2017
Submission Location
SunSpace Dropbox
Page 2 of 3
Moderated November 2016
This assignment is set out in two parts, where the first part should help you build the second. You will be allocated one from each of a-e, A-E, and 1-4 (as defined below) to ensure you have an individual set of data for the assignment.
PART 1: IDEAL STANDARD RANKINE CYCLE (50% of marks)
You are required to analyse a standard Rankine cycle by both hand calculation and using the simulation package CyclePad, in order to validate the software. The cycle specifications are as follows:
 Boiler pressure: (a) 40; (b) 45; (c) 50; (d) 55 bar; (e) 60 bar (as assigned).
 Boiler output temperature: (A) 450; (B) 500; (C) 525; (D) 550C; (E) 575C (as assigned).
 Condenser pressure: (1) 0.6; (2) 0.65; (3) 0.7; (4) 0.75 bar (as assigned).
Assume the mass flow rate is 1 kg/s, so that derived work and heat quantities are specific (i.e. per kg of steam). Use a summary table to compare the following:
 The specific enthalpy at each point in the cycle, determined both by hand calculation, and by CyclePad.
 The net work (Wnet).
 The heat in (Qin).
 The thermal efficiency (ηth).
PART 2: REHEAT RANKINE CYCLE (50% of marks)
*** You should perform this analysis using CyclePad only. ***
In order to improve the net work output and efficiency of the plant, you are required to investigate the implementation of a two-stage reheat Rankine cycle (as covered in class). Use the same pressures and temperature assigned in Part 1. However, you must choose a pressure for the second stage i.e. the lower pressure turbine and explain how you chose it.
For your chosen design, use another summary table to compare the quantities listed above, obtained from the CyclePad analysis of the reheat Rankine cycle.
More detailed submission requirements are summarised overleaf.
Hints on using CyclePad
(i) You can download a free copy of CyclePad from the following link. If you have any trouble obtaining it, email me and I will send you a copy.
http://www.qrg.northwestern.edu/software/cyclepad/cyclesof.htm
(ii) You will find a Rankine Cycle Solved in the CyclePad library. Use this to help you get started with the first part of the assignment. It comprises four parts: heater, turbine, cooler and pump, corresponding to the boiler, turbine, condenser and feed pump, respectively.
(iii) Note that both heater and cooler are modelled as isobaric (i.e. constant pressure), and both turbine and pump are modelled as adiabatic and isentropic.
(iv) In the second part, you can use the Reheating Vapor Cycle Solved in the library as a template.
Page 3 of 3
Moderated November 2016
Submission requirements
You should keep the material to the minimum necessary to fulfil the following, in the order indicated.
Stage 1 (50%)
 A summary table, which includes your manually calculated results (as outlined above) and the CyclePad results.
 Detailed cycle hand calculations, including an annotated diagram of the cycle schematic. This can be hand written, but must be neat and legible.
 Screenshots of the CyclePad Cycle Properties window, the Assumptions Made window, and the T-s diagram generated by the software.
Stage 2 (50%)
 A summary table, showing the CyclePad specific enthalpy results for the reheat Rankine cycle.
 An annotated diagram of the cycle schematic.
 Screenshots of the CyclePad Cycle Properties window, the Assumptions Made window, and the T-s diagram generated by the software.
Untidy or illegible work will be penalised.
This assignment is worth 30% of the total module mark.

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