. Can you identify the cycle (Otto, Diesel, Carnot, and so on)?
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- I need help on this assignment: Exhaust gases from the turbine of a simple Brayton cycle are quite hot and may be used for other thermal purposes. One proposed use is generating saturated steam at 110℃ from water at 30℃ in a boiler. This steam will be distributed to several buildings on a university campus for space heating. A Brayton cycle with a pressure ration of 6 is to be used for this purpose. Plot the following:(a) The mechanical power produced,(b) the flow rate of the produced steam,(c) the maximum cycle temperature, all as functions of the rate at which heat is added to the cycle.A spark ignition engine that operates on Otto cycle has a compression ratio of 10. At the beginningof the compression process, air is at 100 kPa and 25 C. 750 kJ/kg of heat is transferred to air duringthe constant-volume heat-addition process. Consider the variation of specific heats withtemperature. (a) Describe with the aid of diagrams the operational sequence of four stroke spark ignitionengines (b) Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines (c) What is the difference between four and two stroke engines?(d) Explain the relationship between thermal efficiency (?) and compression ratio (r).(e) Why are high compression ratios not used in spark ignition engines?(f) Determine the pressure and temperature at the end of the heat addition process(g) Determine the net-work output, the thermal efficiency, and the mean effective pressure forthe cycle.An ammonia ice plant operates on simple saturation cycle at the following temperatures. Condensing temperature 40°C Evaporating temperature -15°C It produces 10 tons of ice per day at -5°C from water at 30°C. Determine: (a) Capacity of the refrigeration plant. (b) Mass flow rate of refrigerant. (c) Isentropic discharge temperature. (d) Compressor dimensions (bore and stroke) if its volumetric efficiency is assumed as 65%. The compressor is to run at 1400 rpm. Take stroke/ bore ratio (L/D) as 1.2. (e) Horsepower of the compressor if its adiabatic efficiency is taken as 85% and mechanical efficiency as 95%. (f) Theoretical and actual COP.
- DIESEL ENGINE WITH WHR BOILER PROBLEM: A WHR(waste-heat-recovery) boiler is used to recover the heat from the exhaust gases of a 1250 hp Diesel engine. The engine is an 8-cylinder, 16” x 12”, 300 rpm having an exhaust gas temperature of 750 °F. It is operated most of the time at 80 % of its capacity with a fuel consumption of 0.40 lb/hp hr. Ambient room temperature is 82 °F. If the exhaust gas leaves the boiler at 40 °F higher than the temperature of the steam generated at 60 psia, D and S, and if jacket water at 150 °F is used for boiler feed, sketch the set-up and estimate the amount of steam produced. Assume a boiler efficiency of 75 %. Note: Please include the units. Thank you!A power producing equipment with a 4 cylinder, 4- stroke and operating in an air standard diesel cycle has a bore of 10cm and stroke of 12cm. Determine the engine displacement in each cycle.Provide a complete given and computation. Include all the decimals. In a reheat cycle steam at 8.0 MPa and 485C enters the turbine and expands to 1.4 MPa. At this point, the steam is withdrawn and passed through a reheater. It re-enters the turbine at 1.3 MPa and 720°C. Expansion now occurs to the condenser pressure of 0.006 MPa.For the cycle and 1 kg of steam determine (a)the steam flow for an engine and (b) For the engine output of 40,000kW.
- In a refrigerant 22 refrigeration system the capacity is 180 kW at a temperature of "-30°C." The vapor from the evaporator is pumped by one compressor to the condensing pressure of 1500 kPa. Later the system is revised to a two-stage compression · operating on the cycle shown in Fig. 16-16 with intercooling but no removal of flash gas at 600 kPa. a) Calculate the power required by the single compressor in the original system b) Calculate the total power required by the two compressors in the revised system.Concentrating solar collectors are used to provide the heat source for a Rankine cycle using water as the working substance. The design specifications require a power output of 10 MW. Commercially available collectors allow steam to be generated at 2500 kPa and 3000C. The cycle low pressure is assumed to be 7.5 kPa. Determine (a) the cycle thermal efficiency; (b) the steam flow rate.B.) the net work per cycle per cylinder and the thermal efficiency of the cycle c.) the mean effective pressure d.) power output for an engine speed of 3000 rpm
- One way to augment thrust is to add a reheat or afterburning system. For an afterburning gas turbine, draw a modified T-S diagram clearly indicating the region which applies to the reheat.What is the major disadvantage of afterburning?Answer the following: A.) What is the significance of using multiple feedwater heaters? (Write your reference) B.)What is the difference of using multiple feedwater heaters and using only one feedwater heater with their efficiency of cycle? C.) State other things/ways to increase efficiency of a cycle, other than using multiple feedwater heaters.What are the advantages of 1-reheater 2-economizer 3-fixed row of steam turbine.