EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
9th Edition
ISBN: 9781119321453
Author: Sonntag
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 5, Problem 5.18P
To determine
Rate of cooling and COP of the window air conditioner.
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.11 The refrigerator (R) shown in Fig. F3.i! is a closed syster: thet oper-
ates in cycles while in communication with the cold space (T;) and the
building (T). The refrigeration load (QL) reaches the cold space by leak-
ing from T to T across the thermal insulation system (I), which is a
closed system operating steadily. If the work required by the refrigera-
tor is WR, what is the net heat transferred by systems (R) and (I) to the
building (Tg)?
The net heat transferred by (R) and (I) to the building (QR) is
removed by a heat pump (HP) that functions cyclically as a closed
system. The heat pump requires the work WHp and rejects heat to the
ambient of temperature T, which is warmer than the building. Together,
the closed systems (R), (I), (B), and (HP) perform the function of
removing the refrigeration load Q, by rejecting heat to the ambient T.
T
(В)
Тв
(HP)
E WHP
WR
(R)
(I)
TL
Te,
Figure P3.11
38
ENTROPY GENERATION, OR EXERGY DESTRUCTION
The total work requirement is WR + WHP, and…
150 kJ of work is done in a rigid container while the internal energy increases by 95 kJ. Find the heat transfer, in kJ.
Air is heated at constant pressure from 2 7
degrees C to 57 degrees C at 3 bar in a
heater from an infinite heat source at
temperature 227 degrees C Find the gain
in availability of air and the effectiveness
of the heater. Assume To = 280K and
Cp =1.0 kj/kgK.
Chapter 5 Solutions
EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
Ch. 5 - Prob. 5.1PCh. 5 - A windowmounted air conditioner removes 3.5kJ from...Ch. 5 - Prob. 5.18PCh. 5 - R410A enters the evaporator (the cold beat...Ch. 5 - A large heat pump should upgrade 4MW of heat at...Ch. 5 - A car engine 5g/s fuel (equivalent to addition of...Ch. 5 - Prob. 5.45PCh. 5 - R134a fills a 0.1m3 capsule at 20°C, 200kPa. It is...Ch. 5 - Air in a piston/ cylinder goes through a Carnot...Ch. 5 - Consider the previous problem and assume the...
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- THERMODYNAMICS A certain gas expand from 7ft3 to 23ft3 while the pressure remains constant at 17.5psia. Find the work nonflow in the system in BTU.arrow_forwardIn a turbine, steam enters with an enthalpy of 1275 Btu/lb, and leaves with an enthalpy of 1115 Btu/lbm. The transferred heat is 13 Btu/ibm. Find the turbine work in hp where the steam flow rate is 5 lbm/sec?arrow_forwardA water cooler for drinking water should cool 25 L/h water from 18 C to 10 C while the water reservoirs also gains 60 W from heat transfer. Assume that a small refrigeration unit with a COP of 2.5 does the cooling. Find the power input to the unit.arrow_forward
- A closed constant-volume system receives 10Kj of paddle work. The system contains a nitrogen at 340kpa, 5C and occupies 0.1m^3. Find the heat in KJ (Gain or Loss) if the final temperature is 127C. Please use: Q=AU+W (Observe direction) ideal gas equation to find mass table.arrow_forward.The thermal efficiency of a heat engine is 30%, the heat rejected from the engine is 30kJ, evaluate the heat input to the engine.arrow_forwardA solar collector absorbed 40W/m2 heat from the atmosphere. This is equal to the convection brought by air for drying purpose. If the temperature of the air is 40C while the solar collector area's temperature is 80C and neglecting effect of radiation, find the convective heat transfer coefficient.arrow_forward
- Q.4/A combination of a heat engine driving a heat pump, the heat energy supplied to the heat engine is 5040 J, and the temperature of the hot reservoir Tmin is 30 °C and the thermal efficiency of the heat engine is 41%. The work energy W12 of heat engine goes to the heat pump that the coefficient of performance COPHP=1.3. Find: a) The Tmaxmax of the heat engine, b) The Tminmin of the heat pump, c) The work done between two engines d) Qrej of the heat pump T max 150 °C Qadd = 5040 J. W 12 Н.Е. Н.Р. Qrej 30 °C T minarrow_forward2. A closed constant volume system receives 10.5 kJ of paddle work. The system contains oxygen at 344 kPa, 278 K and occupies 0.06 cu. m. Find the heat (gain or loss) if the final temperature is 400 K.arrow_forwardA mixing chamber with heat transfer receives 2 kg / s of R - 134a at 1 MPa, 50 ° C in one line and 1 kg / s of R - 134a at 15 ° C, quality 40% in a line with a valve. The outgoing Now is at 1 MPa, 70 ° C Find the rate of heat transfer to the mixing chamberarrow_forward
- Milk must be received and cooled from 80 ˚F to 38 ˚F in 5hours. If 4000 Gallons of freshmilk received having S.G of 1.03 and CP=0.935 BTU per lb ˚F, find the refrigerationcapacity.arrow_forwardSolve fast. Expert pls.arrow_forward(15%) A small expander (a turbine with heat transfer) has 0.05 kg/s helium entering at 1000 kPa, 550 K and leaving at 250 kPa, 300 K. The power output on the shaft measures 55 kW. Find the rate of heat transfer, neglecting kinetic energies.arrow_forward
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