Chapter 5, Problem 5.38P

P3.4 The condensing and evaporating temperatures of a standard vapor compression cycle using R134a are 5°C and 35°C respectively. The heat absorption rate is 12 kW. Calculate (i) the refrigerant flow rate, (ii) the work input to the compressor, and (iii) the COP of the cycle. [Answers: (i) 0.07875 kgs¯¹, (ii) 1.52 kW, (iii) 7.89]

Steam is delivered by a steam generating unit at 1100 psia and 900 °F. After expansion in the turbine to 300 psia, the steam is withdrawn and reheated to the initial temperature. Expansion now occurs to the condenser pressure of 1 psia. For 1 lb/sec of steam in an ideal cycle, find the thermal efficiency.

Steam is produced for an ideal turbine at a pressure of 3.0MPa. The condenser pressure is 2.0kPa. The heat added per kilogram is 2750kJ. Neglecting pump work, determine the thermal efficiency.

Steam is supplied to a two-stage turbine at 40 bar and 350°C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 350°C and expanded through the second-stage turbine. The condenser pressure is 0.035 bar. Calculate the work output and the heat supplied per kilogram of steam for the plant, assuming ideal processes and neglecting the feed-pump term. Calculate also the specific steam consumption and the cycle efficiency

Steam is supplied to a two-stage turbine at 40 bar and 350°C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 350°C and expanded through the second-stage turbine. The condenser pressure is 0.035 bar. Calculate the work output and the heat supplied per kilogram of steam for the plant, assuming ideal processes and neglecting the feed-pump term. Calculate also the specific steam consumption and the cycle efficiency,

Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the firstturbine until it is just dry saturated, then it is re-heated to 400 °C and expandedthroughthe second-stage turbine. The condenser pressure is 0.04 bar. Determine the specific work output of the system to 3 d.p? what is the specific entalphy in kJ/kg for state 2?

Untitled document > A system consists of a turbine and heat exchanger are connected in series. The working fluid is entering the turbine at P= 0.6 Mpa, Tj= 200 °C and leaving it with P2= 0.2Mpa. Then the turbine exit becomes the heat exchanger inlet to increase the fluid temperature to become 800 °C. Considering that the adiabatic power y =1.4 and the specific heat c, = 1.005 KJ/Kg.K. Determine the turbine production work WT and heat exchanger energy needed to be added qHE. T, = 200 °C P, =0.6 Mpa T;? P,- 0.2 Mpa h high HE T- 800 °C P,=? II

1. In a steam power plant steam enters the turbine at 6 bar and 400°C and is expanded isentropic ally to the condenser pressure of 0.1 bar. If the isentropic efficiency of the turbine is 80%, find the actual net work output and the thermal efficiency.

Steam at 5.2 MPa, 4000C expands in a Rankine turbine to 0.036MPa. For 136 kg/s of steam, determine the work, the thermal efficiency, and the steam rate (a) fot the cycle(b) for the turbine, (c) for an actual turbine with the same specifications, the brake steam rate is 4.80 kg/kwh ang the driven electric generator has an efficiency of 93%, Find brake thermal efficiency , brake engine efficiency, combined work, and quality or temperature of exhaust steam. Don't answer the given problem, just give me the schematic diagram and T-S diagram of the given problem