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Chapter 3: Q1DQ (page 676)

A diesel engine performs 2200 J of mechanical work and discards 4300 J of heat each cycle. (a) How much heat must be supplied to the engine in each cycle? (b) What is the thermal efficiency of the engine?

Short Answer

Expert verified
  1. heat supplied to the engine in each cycle is W=6500J
  2. the thermal efficiency of the engine is e=34%

Step by step solution

01

Step 1:

Work done by diesel engine =2200J

Heat discards =4300J

02

Step 2:

(a) heat supplied to the engine in each cycle.

Calculate heat by,

QH=W+QC(1)

Put values of W and In equation (1),

QH=W+QCQH=2200J+鈥�4300JQH=6500J

Thus, heat supplied to the engine in each cycle is W=6500J

03

Step 3:

(b) the thermal efficiency of the engine.

Here e is thermal efficiency given as,

e=WQH ( 2 )

Put values of w andQHin above equation,

e=WQHe=2200J6500Je=0.34=34%

(c) Thus, the thermal efficiency of the engine is e=34%

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