Thermo question A reversible power cycle and a reversible heat pump cycle operate between hot and...
4.A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures TC and TH, respectively. If the coefficient of performance is 3.3 and TH = 75°F, determine TC, in °F. 5.A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures TC and TH, respectively. If TC = -26°C and TH = 40°C, determine the coefficient of performance.
A power cycle operates between hot and cold reservoirs at 600 K and 300 K, respectively. At steady state the cycle develops a power output of 0.45 MW while receiving energy by heat transfer from the hot reservoir at the rate of 1 MW. (a) Determine the thermal efficiency and the rate at which energy is rejected by heat transfer to the cold reservoir, in MW. (b) Compare the results of part (a) with those of a reversible power cycle...
Question 12 PHYSICS 120 (a) Carefully explain the difference between irreversible and reversible processes. Also explain what the second law of thermodynamics dictates about reversible processes. (You may find it helpful to compare water freezing at 0 °C and super- cooled water freezing at-5 °C.) [5 marks A heat engine operates with an efficiency n = 0.30 between two energy reservoirs at temperatures of 450 K and 293 K. The engine does 90 J of work per cycle. (b) Draw...
Q2. A heat pump cycle is operating reversibly between a warm reservoir at 20o C and a cold reservoir at -5o C. A second heat pump cycle is also operating reversibly between a hot reservoir at 30o C and a cold reservoir whose temperature, TC, is unknown. Given that the coefficient of performance of the first heat pump cycle is twice that of the second cycle, determine TC (in o C). Q3. You see a newspaper advertisement from an organization...
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by heat transfer from a cold reservoir at temperature Tc and rejects energy by heat transfer to a reservoir at an intermediate temperature T greater than Te. The second cycle receives energy by heat transfer from the reservoir at temperature T and rejects energy by heat transfer to a higher-temperature reservoir at TH. Obtain an expression for the coefficient of performance of a single reversible...
At steady-state, a refrigeration cycle operating between hot and cold reservoirs at 300 K and 275 K, respectively, removes energy by heat transfer from the cold reservoir at a rate of 600 kW. (a) If the coefficient of performance is 4, determine the power input required, in kW (b) Determine the minimum theoretical power required for any such cycle.
At steady-state, a refrigeration cycle operating between hot and cold reservoirs at 300 K and 275 K, respectively, removes energy by heat transfer from the cold reservoir at a rate of 600 kW. (a) If the coefficient of performance is 4, determine the power input required, in kW (b) Determine the minimum theoretical power required for any such cycle.
A reversible power cycle whose thermal efficiency is 39% receives 50 kJ by heat transfer from a hot reservoir at 310oC and rejects energy by heat transfer to a cold reservoir at temperature TC. Determine the energy rejected, in kJ, and TC, in oC. Determine the entropy production for the cycle, σcycle, in kJ/K.
Problem 5.040 SI At steady state, a refrigeration cycle operating between hot and cold reservoirs at 300 K and 275 K, respectively, removes energy by heat transfer from the cold reservoir at a rate of 100 kw. (a) If the cycle's coefficient of performance is 4, determine the power input required, in kW. (b) Determine the minimum theoretical power required, in kW, for any such cycle.
5.75 A heating system must maintain the interior of a building at TH = 20 degree C when the outside temperature is T = 2 degree C. If the rate of heat transfer from the building through its walls and roof is 16.4 kW, determine the electrical power required, in kW, to heat the building using (a) electrical-resistance heating, (b) a heat pump whose coefficient of performance is 3.0, (c) a reversible heat pump operating between hot and cold reservoirs...