Chapter_02 - Chapter 2 1 An Ammonia Vapor Refrigeration Cycle Operates At An Evaporator Temperature Of 16 C And A Condensing Temperature Of 32 C.pdf

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Chapter_02 - CHAPTER 2 1 An ammonia vapor refrigeration cycle operates at an evaporator temperature of 16 C and a condensing te…

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Chapter_02 - CHAPTER 2 1 An ammonia vapor refrigeration... SCHOOL

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CHAPTER 2

1. An ammonia vapor refrigeration cycle operates at an evaporator temperature of –16 C and a condensing temperature of 32 C. Determine the coefficient of performance (a) for an ideal saturation cycle, (b) for wet compression with saturated vapor leaving the compressor, and (c) if the vapor at suction to the compressor is superheated 6 degrees. Solution: (a) Ideal saturation cycle

State points 1 2 3 4 h - h 1442.6 - 351.47 COP = = h -h 1690 - 1442.6 (b) Wet compression cycle 1

4

2

1

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t,C -16 105 32 -16

p , kPa

h , kJ/kg 1442.60 1690.00 351.47 351.47

227.04 1239.60 1239.60 227.04

.

= 4 41

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Chapter_02 - CHAPTER An ammonia vapor blurred refrigeration cycle operates anto evaporator temperature of 16 C and a condensing te… This preview2 1has intentionally sections. Signatup view the full version.

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Type your question here! Please include all relevant details, attachments, and requirements so your tutor can provide a complete answer. CHAPTER 2

State points 1 2 3 4

p , kPa 227.04 1239.60 1239.60 227.04

t,C -16 32 32 -16

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h , kJ/kg 1288.0 1487.18 351.47 351.47

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h -h 1288 - 351.47 = = 4 .70 h - hPrivacy 1487.18 - 1442 .6 By continuing you agree to our Policy, Terms of Use, and Honor Code. COP =

1

4

2

1

(c) With superheat

State points 1 2 3 4 COP =

h h

1

2

h -h

-

4

1

, kPa 227.04 1239.60 1239.60 227.04

,C -10 113 32 -16 .

=

1456 - 351 47

.

, kJ/kg 1456 1713 351.47 351.47

p

t

h

.

= 4 29

1713 - 1442 6

2. A standard vapor compression system produces 20 tons of refrigeration using R-12 as a refrigerant while operating between a condenser temperature of 42 C and an evaporator temperature of –25 C. Ask a homework question Determine (a) the refrigerating effect in kJ/kg, (b) the circulating rate in kg/s, (c) the power https://www.coursehero.com/file/12230069/Chapter-02/ li d (d) h ( ) h h j di k d (f) h l fl i /

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supplied, -(d) the COP, the heatvapor rejected in kW, andoperates (f) theatvolume flow temperature rate in L/s.of 16 C and a condensing te… Chapter_02 CHAPTER 2 1 (e) An ammonia refrigeration cycle an evaporator

2

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Table of important properties: State points 1 2 3 4

,C -25 42 42 -25

, kJ/kg 340.4 377 240.6 240.6

t

v

h

, m 3/kg 131.3

(a) Refrigerating Effect: QA

=

h

1

&= (b) m

-

h

4

.

tons = QA

20

& (h (c) W& = m

-

2

Q& (d) COP = &A W

(e) Q& R (f) V&

=

& (h m

.

. kJ kg

= 340 4 - 240 6 = 99 8

2

h

=

1

(20 )(3 .516 )

.

.

= 0 7046

kg s

99 8

) = ( 0.7046 )(377

( 20 )(3 .516)

.

.

.

- 340 4 ) = 25 79

kW

.

= 2 73

25 79

-

h

4

) = (0 .7046 )(377

.

.

- 240 6 ) = 96 10

kW

&

= m v1 = (0.7046 )(131.3) = 92.5 L s

3

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Type your question here! Please include all relevant details, attachments, and requirements so your tutor can provide a complete answer. CHAPTER 2

3. An ammonia simple saturation cycle operates between evaporator and condenser temperatures of –20 C and 35 C, respectively. The system is to be used in producing 5000 kg of ice at –12 C from water at 29 C in 20 hrs. Assuming losses to be 20 percent of the heat to be absorbed from the water, determine (a) the mass flow rate, (b) the heat rejected in the condenser, and (c) the power required by the compression.

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per ton o rerigeraTon TR s L TR s m v m V 10 1 0011 050 022 3 1 1 c TR kW h h m Bicol University

Fig 17 5 381 C condenser temperature 1033 C solution temperature x 2 0675

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