A heat engine operating between two reservoirs receives energy Q;=2100 KJ by heat transfer from a hot reservoir(source) at T;= 2000 K and rejects energy Q2=500 KJ by heat transfer to a cold reservoir (sink) at T2= 400 K. Determine the reversible and irreversible efficiencies of heat engine. Calculate ideal and practical efficiency To be: Q, = 2000KJ Q2 = 400KJ %3D %3D -Calculate the reflexive work Wrev -Calculate practical (real) work

A heat engine operating between two reservoirs receives energy Q;=2100 KJ by heat transfer from a hot reservoir(source) at T;= 2000 K and rejects energy Q2=500 KJ by heat transfer to a cold reservoir (sink) at T2= 400 K. Determine the reversible and irreversible efficiencies of heat engine. Calculate ideal and practical efficiency To be: Q, = 2000KJ Q2 = 400KJ %3D %3D -Calculate the reflexive work Wrev -Calculate practical (real) work

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.

See similar textbooks

Similar questions

An inventor claims to have devised a refrigeration cycle operating between hot and cold reservoirs at 308 K and 278 K, respectively, that removes an amount of energy QC by heat transfer from the cold reservoir that is a multiple of the net work input—that is, QC = NWcycle, where all quantities are positive. Determine the maximum theoretical value of the number N for any such cycle.
(II) A nuclear power plant operates at 65% of its maximumtheoretical (Carnot) efficiency between temperatures of 660°Cand 330°C. If the plant produces electric energy at the rateof 1.4 GW, how much exhaust heat is discharged per hour?
A heat engine operates on the Carnot cycle, and has a thermal efficiency of 75 percent. The waste heat from this machine is rejected to a nearby lake at 15 ° C at the rate of 14 kW. Determine the power output of the motor and the temperature of the source, in ° C.
A cycle heat engine does 50 kJ of work per cycle If the efficiency of the heat engine is 75% The heat rejected per cycle is....
A completely reversible heat engine operates with a source at 1500 R and a sink at 500 R. At what rate must heat be supplied to this engine, in Btu/h, for it to produce 5 hp of power?
Q3/ A refrigeration unit is cooling a space to −5°C by rejecting energy to the atmosphere at 20°C. It is desired to reduce the temperature in the refrigerated space to −25°C. Calculate the minimum percentage increase in work required, by assuming a Carnot refrigerator, for the same amount of energy removed.
Plot the Carnot efficiency of Heat engine at thermal power plant over temperature range of 400 - 750 degree celcius
Consider the re-heat regenerative cycle as shown in the figure below:Suppose that the boiler operates at a constant pressure of 15MPa. The High Pressure turbine expands steam until 4MPa. The Low-pressure turbine then achieves expansion to 700 kPa and 20 kPa. Determine the specific work of Pump II in kJ/kg. a.3.66 b.0.69 c.15.23 d.15.84
An inventor comes to an industrialist and claims to have developed a device that operating in a thermodynamic cycle receives 850 kJ of heat from a source at 550 K and produces 300 kJ of net work while rejecting the waste heat to the atmosphere at 350 K. According to the efficiency he should invest or not?
A heat engine having an efficiency of 70% is used to drive a refrigerator having acoefficient of performance of 5 .The energy absorbed from low temperature reservoir by therefrigerator for each KJ of energy absorbed from high temperature source by the engine is
A Carnot heat engine, shown in Fig. 6–47, receives 500 kJ of heat per cycle from a high-temperature source at 652°C and rejects heat to a low-temperature sink at 30°C. Determine the thermal efficiency of this Carnot engine.
It is claimed that a certain cyclical heat engine operates between the temperatures of TH = 448°C and TC = 155°C and performs W = 3.98 MJ of work on a heat input of QH = 4.97 MJ. a. How much heat, in megajoules, would be discharged into the low-temperature reservoir? b. Which choice, by itself, is unreasonable about the claim? 1. The efficiency is greater than the Carnot efficiency for the stated temperatures 2. The work performed is less than the heat input. 3. The temperature difference is greater than 273.15 K. 4. All of these. 5. None of these