An ocean thermal energy conversion system is beingproposed for electric power generation. Such a systemis based on the standard power cycle for which theworking fluid is evaporated, passed through a turbine, and subsequently condensed. The system is to be used in very special locations for which the oceanic watertemperature near the surface is approximately
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- Explain why a waterless, earth-coupled, closed-loop geo-thermal heat pump system is more efficient than a conventional closed-loop geothermal heat pump system.arrow_forwardGeothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop systems.arrow_forwardGases after combustion are discharged from a flue in a facility to the atmosphere at a temperature of250 °C and a flow rate of 25000 m3/h. It is desired to benefit from the heat of this waste gas in heating.There is a site with 40 residences, each with a heating load of approximately 8 kW, located 3 km fromthe facility.1- Determine the substation capacity to be used, taking into account the hot water requirement foreach house on the site.2- Determine the substation inlet/outlet temperature and the heat exchanger water inlet/outlettemperatures. The temperature of the water leaving the heat exchanger is required not to exceed 95° C. The pipeline between the facility and the site is underground pipeline. Determine the requireddata by considering the region where the facility is located, calculate the heat losses in the line andfind the required insulation thickness.3- Calculate the total capacity including losses and determine the required exchanger dimensions. (Can you solve it with the…arrow_forward
- A vapor compression refrigeration system is designed to have a capacity of 150 tons of refrigeration. It produces chilled water from 22°C to 2°C. Its actual coefficient of performance is 5.86 and 35% of the power supplied to the compressor is lost in the form of friction and cylinder cooling losses. Determine the condenser cooling water required for a temperature rise of 10°C.arrow_forwardThe food storage room requires a cooling system with a capacity of 10 tons of refrigeration which operates at an evaporator temperature of -9.2 ° C and a condenser temperature of 35.1 ° C. The refrigerant used is R-134a and the system operates at saturated conditions. specify: a. COP = b. Refrigerant flow rate = kg / s c. Heat loss rate in the condenser = kJ / sarrow_forwardA two pass steam surface condenser is to be designed to condense 10000 kg/hr of steam having an enthalpy of 2240 kj/kg. Condenser pressure is 13.79 kpa. circulating water enters the condenser at 25 C and leaves at 40 C. the outside and inside diameter for a water tube, OD=20 mm, ID = 17 mm and water velocity of 3 m/s. if the overall coefficient of the heat transfer is 14100 kj/hr-m-C of outside tube surface, determine the amount of circulating water in m/hr.arrow_forward
- A pharmaceutical company plans to install a solid fuel fired boiler for its daily usage. The desired capacity of the steam generation is 1.25 kg per second at pressure of 1.15 MPa and temperature 215oC. Feed water at average temperature of 25oC, is to be fetched from nearby reservoir. The consumption of the solid fuel having calorific value of 25.7 MJ/kg is 375 grams per second. Evaluate the enhancement of efficiency of the boiler if the following accessories are coupled with it. i) Economizer that increases the inlet feed water temperature by 63⁰C and reduces the fuel consumption by 18%. ii) Air-preheater that reduces the fuel consumption by 26%.arrow_forwardThe food storage room requires a cooling system with a capacity of 15 tons of refrigeration that operates at an evaporator temperature of -25.2 ° C and a condenser temperature of 39.2 ° C. The refrigerant used is R-717 and the system operates in saturated conditions.arrow_forward8.3 A four-effect evaporator is being considered for concentratinga fruit juice that has no appreciable boiling-point elevation.Steam is available at 143.27 kPa, and the boiling point ofthe product in the fourth effect is 45°C. The overall heat-transfer coeffi cients are 3000 W/(m 2 °C) in the fi rst effect,2500W/(m2 °C) in the second effect, 2100W/(m2°C) in thethird effect, and 1800W/(m2°C) in the fourth effect. Calculatethe boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all theeffects are equal to 50m2 each. The mass fl ow rate of steam tothe fi rst effect is 2400kg/h, the feed rate to the fi rst effect of 5%total solids fl uid is 15,000kg/h, the concentrated product fromthe fi rst effect leaves at 6.25% total solids, and the concentrationof product leaving the second effect is 8.82% total solids. Make it in the form of a spreadsheet for solving the example problem no. 8.2 and 8.3arrow_forward
- a.) The expansion ratio during the isobaric heat addition process in an Ericsson Cycle is 3.5. Determine the Thermal Efficiency in (%) b.) The pressure ratio during the constant volume heat addition of a Stirling Cycle is 4. What is the thermal efficiency in (%)? PLS ANSWER IT CORRECTLYarrow_forwardA 1200 kW water-cooled chiller has a centrifugal compressor with refrigerant R134a as the working fluid. The compressor runs at 9600 rev/min and has a slip factor of 0.95 and an overall isentropic efficiency of 90%. The impeller tip speed is not to exceed 160m/s. The evaporating and condensing temperatures are 2°C and 40°C respectively. Assuming that there is no superheating and sub-cooling, a) sketch the refrigration cycle on a P-h diagram (please indicate the pressures and specific enthalpies of all points in the cycle); b) determine the mass flow rate of the refrigerant R134a; c) determine the coefficient of performance of the chilled water plant; and discuss the possible measures to uplift the plant COP d) determine the number of stages and the impeller tip diameters, assuming that all stages would share same work input and each stage compression would have the same impeller tip diameter. e) Please also comment how the slip factor can affect the energy performance of the…arrow_forwardFigure below shows a steam jet refrigeration system that produces chilled water in a flash chamber. The chamber is maintained at a pressure by the steam ejector, which removes the vapor generated by entraining it in the low-pressure jet and discharging into the condenser. The vacuum pump removes air and other non-condensable gases from the condenser shell. For the conditions shown on the figure, determine the make-up water and cooling water flow rates in kg/hr. SHOW THE NEEDED DIAGRAMS FOR THE SOLUTIONarrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage LearningRefrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning