Question

using interpolation calculate the enthalpy of saturated liquid
R-134a at P= 680 kPa

a 558 kJ/kg

b 88 kJ/kg

c 350 kJ/kg

d 120 kJ/kg

Answer #1

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Solution

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An ice-making machine operates on the ideal vapor-compression
cycle, using R-134a. The refrigerant enters the compressor as
saturated vapor at 140 kPa and leaves the condenser as saturated
liquid at 600 kPa. Water enters the ice machine at 13oC and leaves
as ice at -4oC, while removing heat at 393 kJ per kg of water.
Estimate the mass flow rate of the refrigerant and the power input
to the ice machine for an ice production rate of 7 kg/h.

1 kg of water in a piston cylinder arrangement is initially in a
saturated liquid state at 1 bar. It undergoes expansion at constant
pressure due to external heat supply to it, to a final state of
saturated vapor.
(i) What is the initial temperature of water in C? (a) 93.50 (b)
96.71 (c) 99.63 (d) 111.4 (e) 12.2
(ii) What is the change in enthalpy of water (kJ/kg-K)? (a)
417.46 (b) 2258.0 (c) 2675.5 (d) 2506.1
(iii) What is...

500 kg of saturated liquid at 11 MPA is heated at constant
pressure until it reaches a temperature of 450 C find the
following: a. enthalpy entropy and specific volume at the end of
the process b. change in entropy in kj/kg k of the process c.
amount of heat needed for the process

Using thermodynamic
tables, and interpolation where needed, at p = 3 bar,
v = 0.5 m3/kg, compute
T in °C and u in kJ/kg. Also locate the state on
sketches of the p–v and T–v
diagrams.

Initially (state 1) a well-insulated rigid tank contains 20 kg
of a saturated liquid-vapor mixture of water at 100 kPa and half of
the mass is in the liquid phase. An electric resistance heater
placed in the tank is now turned on and kept on until all the
liquid in the tank is vaporized (state 2). Determine (a) the
initial specific volume in m3/kg, (b) the final specific
entropy in kJ/kg.K and (c) change of entropy in kJ/K.

Initially (state 1) a well-insulated rigid tank contains 20 kg
of a saturated liquid-vapor mixture of water at 100 kPa and half of
the mass is in the liquid phase. An electric resistance heater
placed in the tank is now turned on and kept on until all the
liquid in the tank is vaporized (state 2). Determine (a) the
initial specific volume in m3/kg, (b) the final specific
entropy in kJ/kg.K and (c) change of entropy in kJ/K.

Ammonia is brought from saturated vapor at 300 kPa to 1400 kPa,
140oC in a steady flow adiabatic compressor.
Thermodynamic properties of ammonia at initial and final states are
given as :
h1= hi = 1431.7 kJ/kg,
s1 = si = 5.4565 kJ/kg-K
h2= he = 1752.8 kJ/kg,
s2= se = 5.7023
kJ/kg-K
h2,s = he,s = 1656.08
kJ/kg
a) Find the actual specific work input to the compressor.
b) Calculate the specific work input to the compressor for
isentropic...

0.75 kg of refrigerant-134a at 120 kPa and 20°C
initially fills a piston-cylinder device. Heat is now transferred
to the refrigerant from a source at 150°C, and the piston which is
resting on a set of stops, starts moving when the pressure inside
reaches 140 kPa. Heat transfer continues until the temperature
reaches 90°C. Assuming the surrounding to be at 25°C and 100 kPa,
determine (a) the work done, (b) the heat transfer, (c) the exergy
destroyed, and (d) the...

0.75 kg of refrigerant-134a at 120 kPa
and 20°C initially fills a piston-cylinder device. Heat is now
transferred to the refrigerant from a source at 150°C, and the
piston which is resting on a set of stops, starts moving when the
pressure inside reaches 140 kPa. Heat transfer continues until the
temperature reaches 90°C. Assuming the surrounding to be at 25°C
and 100 kPa, determine (a) the work done, (b) the heat transfer,
(c) the exergy destroyed, and (d) the...

A piston-cylinder contains 2 kg of refrigerant R-134a at
temperature -20 degrees Celsius and a quality of 20% is heated in
device until it reaches a saturated mixture with quality 60%. a)
Show process on a P-v and P-T diagram b) What is the pressure? c)
What is the change in volume? d) What is the change in the internal
energy? e) Redo the problem if the piston-cylinder assembly is
replaced with a rigid container.

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