FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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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.
A 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.
Suppose 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.
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- A refrigerator (COP = 2.5) is used to maintain a lab temperature at 24° C for that 60 MJ of heat is absorbed. Then its work input would be?arrow_forward3.0 A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat leakage from the surroundings into the cold storage is estimated to be 28 kW. The actual C.O.P. of the refrigeration plant used is one fourth that of an ideal plant working between the same temperatures. Find the power required to drive the plant.arrow_forward3.0 A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat leakage from the surroundings into the cold storage is estimated to be 30 kw. The actual C.O.P. of the refrigeration plant used is one third that of an ideal plant working between the same temperatures. Find the power required to drive the plant.arrow_forward
- A large heat pump should upgrade 4 MW of heat at 65 C to be delivered as heat at 145 C. What is the minimum amount of work input that will drive this?arrow_forwardQ.3 Find the increase in unavailable energy associated with transfer of 800kJ of heat from a constant temperature system at 600K to another constant temperature at 400K. The ambient temperature is 300K. A 150kJ В 182kJ C 200kJ D 220kJarrow_forwardAir 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.arrow_forward
- An inventor draws 25000 kJ/h of heat from a heat well at -30°C, which requires 1.2 kW of power. He claims to have developed a refrigeration cycle that dumps heat into the heat source at 20°C. environment There is no other energy transfer with Evaluate this claim.arrow_forwardA heat engine receives 5 kW at 800 K and 15 kW at 1000 K rejecting energy by heat transfer at 600 K. Assume it is reversible and find the power output, W.?arrow_forwardDiagram pleasearrow_forward
- A Carnot Engine receives 250 KJ/s of heat form a heat-source reservoir at 525ºC and rejects heat to a heat-sink reservoir at 50ºC. What is the power developed and heat rejected?arrow_forwardA solar energy based heat engine which receives 80 kJ of heat at 100 deg C and rejects 70 kJ of heat to the ambient at 30 deg C is to be designed. The thermal efficiency of the heat engine isarrow_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_forward
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The Refrigeration Cycle Explained - The Four Major Components; Author: HVAC Know It All;https://www.youtube.com/watch?v=zfciSvOZDUY;License: Standard YouTube License, CC-BY