FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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2.Two Carnot heat engines run in series with the efficiency of first engine is k times the second. If the
thermal reservoir at low and high temperatures were denoted by TL and TH, find the simplified ratio
of heat absorbed to heat rejected by the second heat engine in terms of TL, TH and k only.
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- 4.31 A refrigerator using R-134a as the refrigerant is used to keep a space at -10°C by rejecting heat to ambient air at 22 °C. R-134a enters the compressor at 140 kPa as a saturated vapor and leaves at 800 kPa and 70°C. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is 2600 W. Determine (a) the mass flow rate of R-134a, (b) the COP, (c) the exergy destruction in each component of the cycle, (d) the second-law efficiency of the cycle, and (e) the total exergy destruction in the cycle.arrow_forwardQ2 (a) Describe briefly four characteristics of a heat engine. Sketch a simple diagram of a heat engine to show the process and direction of heat and work.arrow_forwardDevelop the general energy balance applied to closed systemsarrow_forward
- A claim states that a heat pump has been invented that requires work to be done on the system of 400kJ and delivers energy to its surrounding by heat transfer of 300kJ. Such device is possible True Falsearrow_forwardThermodynamics questionarrow_forward... .. Two Carnot refrigeration A and B operate in series. The refrigerator A absorbs energy at rate Q1(kJ/s) from a body at temperature 300K, and reject energy as heat to a body at temperature T. The refrigerator B absorbs the same quantity of energy which is rejected by refrigerator A from a body at temperature T, and rejects energy as heat to a body at temperature 1200K. If both refrigerators have the same C.O.P, then work input to refrigerator A is 1.5Q1 O Other O 1.4Q1 O 1.1Q1 O 1.3Q1 Oarrow_forward
- A refrigerator operates at steady-state with a COP of 4.5 and power input of 0.8kW. If energy is rejected from the refrigerator to the surroundings at 20°C because of heat transfer from metal coils, the rate of energy rejection is computed as kW and the lowest theoretical temperature inside the refrigerator would be °C.arrow_forwardAn inventor comes to you saying he has invented a refrigerator that maintains a room at 20F while operating in a location at 80F with a coefficient of performance of 8.5, is this possible?arrow_forwardThe first step of a thermodynamic cycle is an isobaric process with increasing volume. The second is an isochoric process, with decreasing pressure. The last step may be either an isothermal or adiabatic process, ending at the starting point of the isobaric process. Sketch a graph of these two possibilities, and comment on which will have greater net work per cycle.arrow_forward
- A heat engine has a solar collector receiving 600 Btu/h per square foot, insidewhich a transfer medium is heated to 800 R. The collected energy powers aheat engine that rejects heat at 100 F. If the heat engine should deliver 8500Btu/h, what is the minimum size (area) of the solar collector?arrow_forwardPlease help me out. Thermodynamics. Thank you.arrow_forwardFind the mean effective pressure of the thermodynamic cycle shown in the figure below.arrow_forward
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