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You are tasked with designing a system to supply energy to a new block of 30 ‘eco’ flats, providing heat (150 kWh per flat) and electricity (at a constant rate of 5 KW per flat) for one day (24 hours). Electricity will be supplied by proton exchange membrane fuel cells (PEMFCs), fed by hydrogen, and operating under standard conditions (P = 1atm, T = 25°C), with a fuel utilisation of 80% and oxygen utilisation of 100%. For the given property, it would be appropriate to install commercial stacks of 15 individual cells, arranged in series. Hydrogen gas necessary for the 1-day operation is stored in 100L tanks, at 700 atm and room temperature, T = 25°C. Heat will be delivered by an air-source cascade heat pump system, operating under the vapour-compression refrigeration cycle, between temperatures of 10°C (assume air temperature is stable) and 100°C, and using water as the working fluid. The cascade system has two cycles, and an intermediate temperature of 46°C. You are requested to prepare a report for the client, containing the following sections and information: Section 1. Calculations and estimations of the energy parameters, justifying assumptions made. In the fuel cells subsystem: (i) Minimum number of hydrogen tanks required for storage. [20 marks] (ii) Overall subsystem efficiency. [10 marks] In the heat pump subsystem: (i) Sketch of the vapour-compression refrigeration cycle (T-S diagram) [5 marks (ii) Work done at the compressor. [15 marks] (iii) Overall subsystem efficiency. [10 marks]  

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Green is a professional engineer who is employed on a full‐time basis by MajorEng. a large engineering firm. However, for a number of reasons, Green is unhappy and for some time has been thinking about looking for a new job. Although Green's current employment at MajorEng provides good pay and interesting work, Green is finding it difficult to work with Potent P.Eng. who is Green's supervisor at MajorEng. Since joining MajorEng a year ago, Potent has frequently made derogatory jokes and remarks about Green's race and religion ‐ sometimes even in meetings with other engineers and clients. On many occasions, Green has informed Potent that such remarks are offensive, hurtful and inappropriate and has asked Potent to stop. Potent refuses to do so and says that Green should "toughen up and learn to take a joke" if Green expects to have a successful career at MajorEng. Recently Green met with a P.Eng. colleague who is a Vice President at EngCo, another engineering company. Upon hearing that Green was interested in considering other opportunities, the colleague offered Green a part‐time job to work in the evenings and on weekends on a trial basis as an engineer for EngCo. Green would work under the colleague's direct supervision who would take responsibility for the work. In a few months, if Green preferred working at EngCo, Green would resign from MajorEng and become a fulltime employee of EngCo. Use the Codes of Ethics and Professional Conduct as your guides (a) Comment on and discuss Potent's conduct with respect to regulation 941 (b) In relation to the regulation of the practice of professional engineering what should Green consider doing about Potent's conduct? (c) Specify and explain the requirements, if any, that Green must satisfy in order to properly undertake such part‐time employment with EngCo?

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