Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 400 °C and expanded through the second-stage turbine. The condenser pressure is 0.04 bar.

Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 400 °C and expanded through the second-stage turbine. The condenser pressure is 0.04 bar.

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

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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Question

Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first
turbine until it is just dry saturated, then it is re-heated to 400 °C and expanded
through
the second-stage turbine. The condenser pressure is 0.04 bar.
High-P
turbine
Low-P
turbine
Reheater
Boiler
P4 = P3 = Pret
reheat
Condenser
find the specific heat input of the system in kJ/kg
to 2.d.p. ?

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