EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
9th Edition
ISBN: 9781119321453
Author: Sonntag
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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A high temperature source supplies a heat engine with 20 kJ of energy. If the engine rejects 4kJ to the low temperature sink, what is the actual efficiency of the engine?
Since Lucas is an engineer familiar with thermodynamics. He decided to create his own heat engine at home to avoid paying for electricity. He created a small, makeshift heat engine for trial. The combustion of his fuel, diesel, reaches a temperature of 750°C, while waste heat is disposed to the atmosphere at 50°C.He, then connected a generator and a heat pump to the heat engine to check the amount of power being produced. Assume that the heat pump will be used to warm his room to 25°C, while the outside temperature is at 5°C. Lucas’ rooms loses 85,000 kJ/hr of heat. And, 25% of the heat engine’s power output goes to the heat pump. How much diesel (in kg) needs to be burned by the heat engine to maintain the temperature in Lucas’ room? Assume carnot heat engine and heat pump. If the natural gas has a heating value of 22,000 BTU/lb. *Round off all answers to four decimal places*
A heat engine has a total heat input of 1.3 kJ and a thermal efficiency of 35 percent. How much work will it produce?
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- Since Lucas is an engineer familiar with thermodynamics. He decided to create his own heat engine at home to avoid paying for electricity. He created a small, makeshift heat engine for trial. The combustion of his fuel. diesel, reaches a temperature of 750°C, while waste heat is disposed to the atmosphere at 50°C. He, then connected a generator and a heat pump to the heat engine to check the amount of power being produced. Assume that the heat pump will be used to warm his room to 25°C, while the outside temperature is at 5°C. Lucas' rooms loses 85,000 kJ/hr of heat. And, 25% of the heat engine's power output goes to the heat pump. How much diesel (in kg) needs to be burned by the heat engine to maintain the temperature in Lucas' room? Assume carnot heat engine and heat pump. If the natural gas has a heating value of 22,000 BTU/lb.arrow_forwardA solar collector produces a maximum temperature of 98 °C using concentrated sunlight. This energy is used in a heat engine that operates in a 10°C environment. If the solar collector is redesigned to focus the sunlight and reach a higher temperature, what should the maximum temperature be (in °C) to double the efficiency, assuming the heat engine is a Carnot cycle?arrow_forwardRefrigerant as a work fluid to keep an environment at 25 ° C. A heat pump using 134a is used. The heat pump keeps heat entering the evaporator at a temperature of 50 ° C. and 2,718 kW of heat from the geothermal water that comes out of the evaporator at 40 ° C. Cooler fluid enters the evaporator at 15% dryness at 20 ° C and saturated at the same pressure comes out as steam. Since the compressor consumes 1.2 kW of power; a-) Mass flow rate of the refrigerant, b-) The heat provided for heating purposes per unit time, c-) COP value of the heat pump, d-) Find the minimum power required for the compressor in case of providing the same amount of heat.arrow_forward
- A heat pump with a COP of 3.2 is used to heat a perfectly sealed house (no air leaks). The entire mass within the house (air, furniture, etc.) is equivalent to 1200 kg of air. When running, the heat pump consumes electric power at a rate of 5 kW. The temperature of the house was 7°C when the heat pump was turned on. If heat transfer through the envelope of the house (walls, roof, etc.) is negligible, the length of time the heat pump must run to raise the temperature of the entire contents of the house to 22°C is (a) 13.5 min (b) 43.1 min (c) 138 min (d) 18.8 min (e) 808 minarrow_forwardPlease evaluate these claims from your thermodynamic perspectives: i. An inventor claims to have invented a heat engine that has thermal efficiency of 85% when operating between two heat reservoirs at 1200K and 300K. ii. An inventor claims to have developed a refrigerator that maintains the refrigerated space at -10°C while operating in a room where the temperature is 24°C and has a COP of 14.arrow_forwardA heat engine working with a thermal efficiency of 35% receives 2 kW of heat from a furnace. The waste heat rejected from the engine isarrow_forward
- Two Carnot engines are hooked up in series so that the waste thermal energy at constant tempera- ture TM for the first engine is used as the heat source for the second engine. The high temperature reservoir for engine 1 is at TH = 327 C. The low temperature reservoir for engine 2 is at TL = 27 C. TL < TM < TH. For what value of TM in C will the combined engine produce the greatest total work output, wi + w2? TH 1 W1 TM 2 W2 TL Figure 2: Two Carnot engines operate in series.arrow_forwardA Carnot heat engine operates between a source at 727 °C and a sink at 27 °C. If the heat engine is supplied with heat at a rate of 800 kJ/min, i. Determine the thermal efficiency. ii. Calculate the power output of this heat engine.arrow_forwardA refrigeration unit absorbs 1 kW of heat from the cold reservoir and rejects 1.3kW of heat to the warm reservoir. What is the unit's coefficient of performance?arrow_forward
- please help answer all of this questio A b c d e f g please its thermodynamics assignment do allarrow_forward1. An inventor claims to have invented a heat engine that receives 750kJ of heat from a source at 400K and produces 250kJ of net work while rejecting the waste heat to a sink at 300K. Is this a reasonable claim? Why?arrow_forward2. What is the highest possible theoretical efficiency of a heat engine operating with a hot reservoir of furnace gases at 2000°C when the cooling water available is at 10°C?arrow_forward
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