Please help solve both. Need it for my homework Problem 7A Carnot heat engine receives heat from a reservoir at 1600°F at a rate of 710 Btu/min and rejects the wasteheat to the ambient air at 75°F. The entire work output of the heat engine is used to drive a refrigerator thatremoves heat from the refrigerated space at 15°F and transfers it to the same ambient air at 75°F. Determine(a) the maximum rate of heat removal from the refrigerated space, and (b) the total rate of heat rejection tothe ambient air.Problem 8A heat engine operates between two reservoirs at 825 and 25°C. One-half of the work output of the heatengine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 1°C and transfersit to a house maintained at 22°C. If the house is losing heat at a rate of 60,000 kJ/h, determine the minimumrate of heat supply to the heat engine required to keep the house at 22°C.

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Answered: Problem 7 A Carnot heat engine receives…

Sustainable Energy

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Author:DUNLAP, Richard A.

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Chapter14: Ocean Thermal Energy Conversion And Ocean Salinity Gradient Energy

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problem 5.3 Consider a steam power plant that operates on the ideal reheat Rankine cycle. The plant maintains the boiler at 5000 kPa, the reheat section at 1200 kPa, and the condenser at 20 kPa. The mixture quality at the exit of both turbines is 96 percent. Determine the temperature at the inlet of each turbine and the cycle's thermal efficiency. Answers: 327°C, 481°C, 35.0 percent High-P turbine Low-P turbine Reheater Boiler Condenser 2 Pump
2-64 Nitrogen enters a steady-flow heat exchanger at 150 kPa, 10°C, and 100 m/s, and it receives heat in the amount of 120 kJ/kg as it flows through it. Nitrogen leaves the heat exchanger at 100 kPa with a velocity of 200 m/s. Determine the Mach number of the nitrogen at the inlet and the exit of the heat exchanger.
Problem 2 Refrigerant-134a enters the compressor of a refrigeration system as saturated vapor at 0.16 MPa, and leaves as superheated vapor at 0.9 MPa and 70°C at a rate of 0.08 kg/s. Determine the rates of energy transfers by mass into and out of the compressor. Assume the kinetic and potential energies are negligible.
A spring-loaded piston-cylinder device contains 1.5 kg of carbon dioxide. This system is heated from 200 kPa and 25 °C to 1200 kPa and 300°C. Determine the total heat transfer to and work produced by this system.
The inlet and exit temperatures of the air expanded at an adiabatic turbine are 50 Cand -30 C, respctively, while operating at a plant. The air enters the turbine with a volumetric flow rate of 25 L/s and at 450 kPa. Assume air behaves as an ideal gas with constant specific heats. Calculate the turbine power output (kW) at isentropic conditions if the turbine operates at isentropic efficiency of 75%?
Q2): 1200 BPD of 32 ° API crude oil is fed to an atmospheric distillation unit, the following products were obtained in the presence of 567 lb/hr steam. Assume vaporization temperature = 576 °F Volume, °API Mw T Latent heat CP, CPL Percent (Btu/Lb) (Btu/Lb °F) (Btu/Lb °F) (°F) Gasoline 26.8 62.8 286 110 0.615 120 0.59 Naphtha 5.63 52.8 113 155 335 0.604 0.58 420 Kerosene 19.8 45.6 185 100 0.60 0.604 Gas oil 510 10.6 39.4 240 0.615 90 0.63 510 Reduced 36.97 0.74 31.2 crude 576 Crude 100.00 0.5 535 Steam Check the gas oil plate temperature if the dew point and bubble point of gas oil are 600 ° F and 580 ° F respectively and the pressure at the withdrawn plate is 990 mm Hg. Given: 1 BPD = 42gal, pwater 8.324 lb/gal
When a refrigerant vaporizes, it takes heat from its surroundings. The latentheat of vaporization is the amount of heat needed for the refrigerant tovaporize. When 38.5 pounds of R-124 vaporize at 5°F, the latent heat ofvaporization is 2,721.95 Btu. What is the latent heat of vaporization for 1 poundof R-124 at 5°F?
As a plant maintenance engineer, you are required to purchase a 3,000 L tank of liquid butane to heat a maintenance building during the winter. You are concerned about the tank rupture and the possibility of a vapour cloud explosion of all the butane. How far (in metres) must the tank be from the maintenance building to ensure that it will receive only partial demolition in the event of an explosion? The specific gravity of liquid butane is 0.6, and the energy of explosion for butane is 510 kcal/gm-mol. Assume the explosion efficiency is 10 % in this case.
Problem-9, Civil (Environmental Engg.) An electrostatic precipitator (ESP) with 5600 m2 of collector plate area is 96 percent efficient in treating 185 m3/s of flue gas from a 200 MW thermal power plant. It was found that in order to achieve 97 percent efficiency, the collector plate area should be 6100 m2. In order to increase the efficiency to 99 percent, find the ESP collector plate area (expressed in m²).
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Blowers are used in wastewater treatment plants to assist microorganisms in degrading pollutants. The impeller of a centrifugal blower has a radius of 15 cm and a blade width of 6.1 cm at the inlet, and a radius of 30 cm and a blade width of 3.4 cm at the outlet. The blower delivers atmospheric air at 20°C and 95 kPa. Disregarding any losses and assuming the tangential components of air velocity at the inlet and the outlet to be equal to the impeller velocity at respective locations, determine the volumetric flow rate of air when the rotational speed of the shaft is 800 rpm and the power consumption of the blower is 120 W. Also determine the normal components of velocity at the inlet and outlet of the impeller.

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