1) (Problem 11-56, engel & Boles, 9th Edition). Assume we have steady operating conditions. Neglect kinetic and potential energy changes. The flash chamber is adiabatic. A two-stage compression refrigeration system operates with refrigerant-134a between the pressure limits of 1.4 and 0.10 MPa. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.4 MPa. The refrigerant leaving the low-pressure compressor at 0.4 MPa is also routed to the flash chamber. The vapor in the flash chamber is then compressed to the condenser pressure by the high-pressure compressor, and the liquid is throttled to the evaporator pressure. Assuming the refrigerant leaves the evaporator as saturated vapor and both compressors are isentropic, determine (a) the fraction of the refrigerant that evaporates as it is throttled to the flash chamber, (b) the rate of heat removed from the refrigerated space for a mass flow rate of 0.25 kg/s through the condenser, and (c) the coefficient of performance. 2) (Problem 11-58, engel & Boles, 9th Edition). Reconsider problem C.1. Investigate the effect of various compressor efficiencies of 80, 90, and 100 percent. Report the coefficient of performance as a 1 by 3 matrix. The autograder will generate COP vs compressor efficiency plot.