Question 1 Your first assignment as a graduate engineer in a geothermal energy consultancy sees you on site at the locat

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Question 1 Your First Assignment As A Graduate Engineer In A Geothermal Energy Consultancy Sees You On Site At The Locat 1 (181.31 KiB) Viewed 39 times

Question 1 Your first assignment as a graduate engineer in a geothermal energy consultancy sees you on site at the location of a proposed geothermal power plant development. a) Sensors fitted within an exploratory well at the site return values of 200kPa and 110∘C for pressure and temperature, respectively. What is the state of the geothermal fluid at these conditions? [1 mark] b) Based on this, what type of geothermal power plant would you recommend for generating electricity at the site? Please explain your answer. [2 marks] c) In the end, the client decides that they want to develop a binary cycle power plant at the site. In order to help convince their stakeholders of the decision, they ask you to provide two environmental benefits for choosing this particular technology. [2 marks] d) As part of your firms duty of care to the client, your line manager asks you to provide a balanced response to the client and requests that you also mention two aspects that might have the potential to cause a negative environmental impact. [2 marks] e) Your manager asks you to come up with an initial design for the plant, assuming the plant operates on an ideal Rankine cycle with Propane (C3​H8​) as the working fluid. You are told that the turbine and the condenser should have operating pressures of 1,400 kPa and 100kPa, respectively. As part of your initial assumptions, you decide that the working fluid will arrive at the inlet of the turbine as a dry saturated vapor and will leave the condenser as a saturated liquid. You also decide that a pre-heater is not required. Sketch a layout of the plant, indicating where the geothermal fluid will enter and exit the plant, and draw the corresponding T−s or p−h diagram, labelling each stage of the cycle. [4 marks] Page 3 of 5 f) In order to meet environmental regulations, local planners will only authorise the power plant development if the geothermal fluid is reinjected underground at a temperature of 50∘C or less. What is the value of heat to be transferred from the geothermal fluid across the evaporator in order to satisfy the planner's requirement, given the fluid is being produced at a rate of 164 kg/hr and its specific heat capacity is 4.18 kJ/kg∘C ? [3 marks] g) What is the required mass flow rate of the working fluid to satisfy the heat transfer requirements across the evaporator? [9 marks] h) Calculate the work output by the turbine.