Initially, a dlosed system consists of 21b of water vapor at the temperature and volume of 300°F and 20 f, The System is Compressed isothermally to a volume of 9.05 A, and there is energy transfer by work of magnitude 70.8 Btu into the SyStem. Negleckng the ecects of kinetic and potential energy, calculate the value of the heat Hransfer n Btu.

The figure below is the basic plot of pressure vs. volume for the Dual Standard Cycle. Constant pressure heat addition 3 4 = constant Нeat IN Adiabatic expansion Heat OUT (Constant volume heat rejection) Constant volume heat addition Adiabatic compression Volume (V) Using the Dual Air Standard Cycle and the following data: Assume constant properties of air. R= 287 J/kgK; Cp = 1005 J/kgK; Cv = 718 J/kgK;y = 1.4 Cycle compression ratio = 11 (v1/v2) Air conditions prior to compression: Pressure = 1.6 bar; Temperature = 298K Heat added at constant volume = 290000 J/kg Heat added at constant pressure = 579000 J/kg a) Calculate the pressure at the end of the compression process. P2 = bar Pressure (P) LO

Stefan-Boltzman law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in °K) A. +4 T4 B. C. D. O 1 t4 1 T4

As shown in the figure below, a reversible power cycle receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc by heat transfer to a cold reservoir at Tc. Hot reservoir Boundary- ZOH R Cold reservoir O at-T (a) If TH=600 K and Tc=400 K, what is the thermal efficiency? (b) If TH-500°C, Tc-20°C, and Wayde 200 kJ, what are QH and Qc. each in kJ? (c) If n = 50% and Tc= 40°F, what is TH, in °F? (d) If n = 40% and TH - 727°C, what is Tc. in °C? W cycle