 # the property tables moind the stated properties for the following ...

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the property tables moind the stated properties for the following 1 Glyouthink any quantity is undefined enter the value -1) phase saturated liquid liquid - saturated Prapour mature compressed A six- cylinder four stroke internal combustion engine can be ideal Diesel cycle. The inlet air temperature and pressure are 19.3°C and 95kPa, respectively. The compression is 17.4, and the peak temperature is 1870K (Work to four significant figures throughout.) 2 a) Calculate the pressure and temperature at the end of the compression stroke pressure kPa temperature = K b) What is the cut-off ratio? c) Calculate the pressure and temperature at the end of the power stroke pressure kPa temperature K d) Complete the following table for specific heat and work for all four processes (take state to be the beginning of the compression stroke) Process q(kJ/kg) w (kJ/kg) 1->2 2->3 3->4 e) Calculate the following specific net work out - kJ/kg specific heat supplied kJ/kg thermal efficiency f) lithe bore diameter is 95mm, the stroke is 119mm, and the engine running at 4000rpm, calculate the following volume of the cylinder mass net power output kW An ideal vapour compression refrigeration cycle uses R134a as the working fluid. During the throttle process, the temperature 3 drops from 35°C to -20°C. a) Determine the lower and upper pressures in the cycle (give your answer to as many significant figures as in the property tables) lower pressure bar upper pressure bar b) Determine the specific enthalpy and specific entropy of the fluid entering the compressor specific enthalpy = kJ/kg (to S isignificant figures) specific entropy KJ/kg. K (to significant figures) c) Calculate the specific entropy and specific enthalpy of the fluid leaving the compressor specific entropy = kJ/kg.K (to 5 significant figures) specific enthalpy = kJ/kg (to decimal place) d) Determine the specific enthalpy in the throttle specific enthalpy kJ/kg (to 5 significant figures) e) Complete the table for specific heat and work for all four processes (give your answers to 1 decimal place) (take state 1 to be the start of the compressor) specific heat specific work Process (kJ/kg) (kJ/kg) 1-+2 2->3 3->4 4->1 f) Evaluate the coefficients of performance of the cycle if the device is acting as refrigerator and as heat pump (give answers to 3significant figures) COP COP

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