FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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A cycle heat engine does 60KJ of work per cycle. If th efficiency of the heat engine is 60%. The heat rejected per cycle is?
A heat engine of 30% efficiency drives a heat pump of COP 5. The heat is transferred both from engine and the heat pump to circulating water for heating the building in winter. Find the ratio of heat transfer to the circulating water from heat pump to the heat transfer to the circulating water from the heat
A cycle HE does 60kJ of work per cycle. If the efficiency of the heat engine is 60%. The heat rejected per cycle is.
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- A fraction of some power to a motor (1), 2 kW, is turned into heat transfer at 500 K (2) and then it dissipates in the ambient at 300 K (3). Give the rates of exergy along the process 1-2-3.arrow_forwardIf COP of heat pump is 4, find the efficiency of heat engine working between the same temperature range.arrow_forwardI need the answer as soon as possiblearrow_forward
- Carnot machine operates between a hot reservoir at 200°C and a cold reservoir at 20°C. When operated as an engine it receives 1000 kJ/kg, find the work output in kJ/kg.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 tank of water has a shaft rotating at 60 rpm with a torque of 40 N-m that is stiring the water. A heater is also present that operates at 120V and draws 4A of current. Heat is then removed from the water such the the total energy content of hte water is constant. How much heat is removed?arrow_forward
- Find the COP of refrigerator working between temperatures 350 K and 1050 K. What will be efficiency of heat engine operating in same temperature range?arrow_forwardSuppose 400 kW of power potential is wasted during the process as a result of irreversibility. Let say the heat pump received heat at a rate of 1000 kJ/s from a heat source. The reversible power of the present process is found to be 800 kW. Find unavailable heat, which is rejected to the sink.arrow_forwardA tank of water has a shaft rotating at 60 rpm with a torque of 40 N-m that is stirring the water. A heater is also present that operates at 120V and draws 4A of current. Heat is then removed from the water such the total energy content of the water is constant. How much heat is removed?arrow_forward
- A 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_forward4arrow_forward/Heat is transferred from a tank of water in a refrigerator at(OC) degrees to a tank of boiling water at (100 C) degrees. With a reversible machine (heat pump). Calculate the Heat drawn from the refrigerator. if it was The heat transferred to the tank of boiling water is 2254kJ.arrow_forward
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