Complete Analysis of Heat Engine Goal Solve for the efficiency of a heat engine using a five-step process the includes: 1. Making a state table. 2. Making a process table. 3. Calculating the totals for Work, Heat, and Internal-Energy-Change. 4. Identifying the heat input (hot reservoir) and output (cold reservoir). 5. Calculating the efficiency of the engine. Problem Shown in the figure to the right is a cyclic process undergone by a heat engine. Your heat engine shall use 9.0 moles of nitrogen gas (diatomic). During the process a->b, the pressure rises by a factor of 2.0. Solution (1) Fill in the State Table (all pressures in Pascals, all volumes in cubic meters, all temperatures in K). (2) Fill in the Process Table (all entries in Joules). (3) Find the Totals: (4) Find the heat input (from "hot reservoir") and the heat output (to "cold reservoir"): (5) Find the efficiency of the engine: a b C Pressure a->b b->c c->a Work Work = Heat = dU = Q-hot = Q-cold = efficiency = P T₁ Volume P₁ = 100,000 Pa Engine Cycle Heat J J J = 300 K J J % isothermal du с Temperature V
Complete Analysis of Heat Engine Goal Solve for the efficiency of a heat engine using a five-step process the includes: 1. Making a state table. 2. Making a process table. 3. Calculating the totals for Work, Heat, and Internal-Energy-Change. 4. Identifying the heat input (hot reservoir) and output (cold reservoir). 5. Calculating the efficiency of the engine. Problem Shown in the figure to the right is a cyclic process undergone by a heat engine. Your heat engine shall use 9.0 moles of nitrogen gas (diatomic). During the process a->b, the pressure rises by a factor of 2.0. Solution (1) Fill in the State Table (all pressures in Pascals, all volumes in cubic meters, all temperatures in K). (2) Fill in the Process Table (all entries in Joules). (3) Find the Totals: (4) Find the heat input (from "hot reservoir") and the heat output (to "cold reservoir"): (5) Find the efficiency of the engine: a b C Pressure a->b b->c c->a Work Work = Heat = dU = Q-hot = Q-cold = efficiency = P T₁ Volume P₁ = 100,000 Pa Engine Cycle Heat J J J = 300 K J J % isothermal du с Temperature V
Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter12: Thermal Energy
Section: Chapter Questions
Problem 80A
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Step 1: Given:
VIEWStep 2: 1. Making a state table;
VIEWStep 3: 1. Making a state table;
VIEWStep 4: 2. Making a process table.
VIEWStep 5: 3. To calculating the totals for Work, Heat, and Internal-Energy-Change.
VIEWStep 6: 4. The heat input (hot reservoir) and output (cold reservoir). 5. The efficiency of the engine
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(4) Find the heat input (from "hot reservoir") and the heat output (to "cold reservoir")
**The answer above for Q-cold (78567.6 J) is incorrect**
Also part c of the table is not complete. Missing part c
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