FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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PROBLEM 2.0 The working substance for a Carnot cycle is 9 Ib of air. The volume at the beginning of isothermal expansion
is 10 cu ft and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the
cold body is 90°F. Find
The heat added BTU.
The heat rejected in BTU.
The mean effective pressure in psi
The ratio of expansion during the isentropic process
The overall ratio of compression.
Solve it..
Steam engine with incomplete expansion receives saturated steam at 1.04 Mpa,expands it to 0.105 Mpa where release occurs. Exhaust is to a condenser at 40C.The actual engine uses 6070 kg/h of steam; it has a brake engine efficiency of 60%and a mechanical efficiency of 85%. The electric generator which it drives has anefficiency of 925. (a) For the ideal engine, find the thermal efficiency and the mep.For the actual engine, determine (b) the brake work in kW and the brake thermalefficiency, (c) the indicated work in kW, indicated thermal efficiency and indicatedsteam rate, (d) the combined thermal efficiency and the combined steam rate
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- Carnot cycle operates between 30°C and 350°C. Find the cycle efficiency.arrow_forwardThe efficiency of Carnot cycle operating at a maximum temperature of 460 oF is 50 %. Find the minimum temperature of the cycle.arrow_forward2. A reverse Carnot cycle requires 3 hp and extracts energy from the laketo heat a house .If the house is kept at 70°Fand requires 2110 kj/min... what is the temperature of the lake?arrow_forward
- 3 The total volume displaced in the cylinder for a Carnot Cycle is easily determined with Isothermal expansion ratio True Falsearrow_forwardFind the power output and the low T heat rejection rate for a Carnot cycle heat engine that receives 6 kW at 250 ℃ and rejects heat at 30 ℃.arrow_forwardProvide the given, manual step by step solution, and diagram. A Carnot cycle has an efficiency of 60 %. The heat added is 1000 KJ.What is the heat rejected from the cycle?arrow_forward
- 6. A Reversed Carnot Cycle rejects 833 BTU/lb as heat at a temperature of 1140F. The cycle receives heat at a temperature of 140F. Calculate: a. The change of entropy for the heat rejection process, BTU/lb-R b. The net cycle work in BTU/lbarrow_forwardShow a derivation of final temperature of dual cycle in terms of initial temperature and ratiosarrow_forwardII. Draw the Carnot cycle then prove that the efficiency of a Carnot heat engine is nc=1- TL THarrow_forward
- V5arrow_forwardA Carnot cycle operating on 2kg of methane, have the following properties given at the beginning of isothermal expansion, P=2060 kPaa, T=270oC. The ratio of the isothermal expansion is 1.8 and the isentropic compression is 7.2. Find the volumearrow_forwardDerive the formula of efficiency of the following: b. Diesel Cycle in terms of cutoff ratio rc, specific heat ratio k and compression rarrow_forward
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