Chapter 8, Problem 8.40P

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.

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.

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?

A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency?

A piston-cylinder device contains 3 kg of R-134a fluid at 100 kPa and 0.6 quality conditions. The system is heated up by an external heat source at 600 K. If the destroyed exergy is 30 kJ and ambient temperature is 300 K, find Final pressure, entropy generation, heat input and final dryness.

I was getting 35.4 but correct answer is 0.228. please help me to solve it

. Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K.  A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator.  In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building.  In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled.  For the heat pump or refrigerator, the work input is provided by electricity.  For this information answer the following questions: a) Calculate the Carnot Efficiency of a heat engine that operates between TH and TL. b) A room is maintained at a constant temperature of 20 C and has a heat loss of 20,000 W. Consider this room for a period of 3 hours. The surroundings are at a temperature of TI.  In one option the room is heated using resistive heaters that are operated with electricity.  b1)Determine the electrical energy input to these heaters. b2)Determine the efficiency of…

I need a quick solution please

1. A heat pump design creates a heating effect of 35 kW while using 15 kW of electrical power. wwww wwwwn wwwww w The thermal energy reservoirs are at 300 K and 250 K. www ww (a) Show the system sketch and label all the values given on it ww www u w w (b) Demonstrate the 1st law application for this system (c) Find entropy generation