3- A reaction turbine is supplied with steam at (60 bar, 600 C°). The condenser pressure is (0.07 bar). If the reheat factor can be assumed to be (1.04) and the stage efficiency is constant throughout at (80%). Calculate the steam flow required in (ton/hr) for a diagram power of (25 MW). (Ans. 75.6 ton/hr) The cteam co ncu ntion at full lead for a l2 MW +urbine ic 116 6+en/brl At half lead the

3- A reaction turbine is supplied with steam at (60 bar, 600 C°). The condenser pressure is (0.07 bar). If the reheat factor can be assumed to be (1.04) and the stage efficiency is constant throughout at (80%). Calculate the steam flow required in (ton/hr) for a diagram power of (25 MW). (Ans. 75.6 ton/hr) The cteam co ncu ntion at full lead for a l2 MW +urbine ic 116 6+en/brl At half lead the

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

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The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.
3- A reaction turbine is supplied with steam at (60 bar, 600 C°). The condenser pressure is (0.07 bar). If the reheat factor can be assumed to be (1.04) and the stage efficiency is constant throughout at (80%). Calculate the steam flow required in (ton/hr) for a diagram power of (25 MW). (Ans. 75.6 ton/hr) 4- The steam consumption at full load for a (3 MW) turbine is (16.6 ton/hr). At half load the steam consumption is (9.1 ton/hr). Applying Willan's line, estimate the steam consumption at no load, and the consumption at a load of (2.5 MW). (Ans. 1.6 ton/hr; 14.1 ton/hr)
The condensing pressure for a Rankine engine is 0.001325 MPavac. Calculate the following for steam flow rate = 1 kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa. Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: Ideal turbine work (KW). Ans.____________________________ Heat rejected at condenser (KJ/sec). Ans.____________________________ Mass of cooling water in kg/sec if cp H2O = 4.18 KJ/kg-K, and inlet temp of water to condenser = 20 deg C, outlet temp is 35 deg C. Ans.____________________________ Pump work in KW. Ans.___________________________
The condensing pressure for a Rankine engine is 0.001325 MPavac. Calculate the following for steam flow rate = 1 kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa. Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: Pump work in KW. Ans. Ideal heat rate in KJ/KW-hr. Ans. Rankine engine efficiency (%). Ans. Cycle thermal efficiency ( %). Ans
Example 4.5: Stem expands in a turbine from 25 bar and 300°C to a condenser pressare of 20 KPa. Evaluate the Rankine cycle efficiency. What is the efficiency if the initial tempprature of steam is 500°C instead of 300°C ? Now if the boiler pressure is increased to 60 bar maintaining the steam temperature at turbine inlet at 500°C, calculate the efficiency. Assume the condenser pressure to rmain constant in all the cases. n-25 bar
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Q.2: A refrigeration system using refrigerant 22 is to have a refrigerating capacity of 80 kW. The cycle is a standard vapor-compression cycle in which the evaporating temperature 42°C. -8°C and the condensing temperature (a) Determine the volume flow of refrigerant measured in cubic is meters inlet at the to the compressor. second per (b) Calculate the power required by the compressor. (c) At the entrance to the evaporator what is the fraction of vapor in the mixture.
The condensing pressure for a Rankine engine is 0.001325 MPavac. Calculate the following for steam flow rate = 16.3846 kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa. Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: PV and TS diagrams of the cycle showing ideal and actual process lines Heat rejected at condenser (KJ/sec). Ans.____________________________ Mass of cooling water in kg/sec if cp H2O = 4.18 KJ/kg-K, and inlet temp of water to condenser = 20 deg C, outlet temp is 35 deg C. Ans.___________________________
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5. Sketch a Rankine eycle on T-s diagram and derive the thermal efficiency for a rankine eycle from its 4 steps. Show on T-S plot and discuss what is the effect of a. Increasing superheat b. decreasing condenser pressure c. Adding friction at pump and turbine
The condensing pressure for a Rankine engine is 0.001325 MPavac. Calculate the following for steam flow rate = 1 + (200/13) kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa. Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: PV and TS diagrams of the cycle showing ideal and actual process lines Heat rejected at condenser (KJ/sec). Ans.____________________________ Mass of cooling water in kg/sec if cp H2O = 4.18 KJ/kg-K, and inlet temp of water to condenser = 20 deg C, outlet temp is 35 deg C. Ans.____________________________ Rankine engine efficiency (%). Ans.____________________________ Cycle thermal efficiency ( %). Ans.____________________________
3.5 An ammonia refrigeration system operates between saturated suction temperature of -20°C, and saturated discharge temperature of +40°C. Com- pare the COP of the cycle using wet compression with that of the cycle using dry compression. Assume that the vapour leaving the compressor is saturated in the case of wet compression, and the vapour entering the compressor is saturated in the case of dry compression. The refrigerant leaves the condenser as saturated liquid.