An Ocean Thermal Energy Conversion (OTEC) power plant built in Hawaii in 1987 was designed to operate between the temperature limits of 86°F at the ocean surface and 41°F at a depth of 2100 ft. About 13,300 gpm of cold seawater was to be pumped from deep ocean through a 40-in-diameter pipe to serve as the cooling medium or heat sink. If the cooling water experiences a temperature rise of 6°F and the thermal efficiency is 2.5 percent, determine the amount of power generated. Take the density of seawater to be 64 Ibm/ft3. Also, take the specific heat of water to be c= 1.0 Btu/lbm-°F. KW. The amount of power generated is

An Ocean Thermal Energy Conversion (OTEC) power plant built in Hawaii in 1987 was designed to operate between the temperature limits of 86°F at the ocean surface and 41°F at a depth of 2100 ft. About 13,300 gpm of cold seawater was to be pumped from deep ocean through a 40-in-diameter pipe to serve as the cooling medium or heat sink. If the cooling water experiences a temperature rise of 6°F and the thermal efficiency is 2.5 percent, determine the amount of power generated. Take the density of seawater to be 64 Ibm/ft3. Also, take the specific heat of water to be c= 1.0 Btu/lbm-°F. KW. The amount of power generated is

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 2RQ: The operating condition for the single compressor in a household refrigerator is the lowest box...

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Geothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop systems.
The operating condition for the single compressor in a household refrigerator is the lowest box temperature, which is typically A. 0F B. -20F C. 20F D. 40F
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*
An Ocean Thermal Energy Conversion (OTEC) power plant built in Hawaii in 1987 was designed to operate between the temperature limits of 86°F at the ocean surface and 41°F at a depth of 2100 ft. About 13,300 gpm of cold seawater was to be pumped from deep ocean through a 40-in-diameter pipe to serve as the cooling medium or heat sink. If the cooling water experiences a temperature rise of 6°F and the thermal efficiency is 2.5 percent, determine the amount of power generated. Take the density of seawater to be 64 lbm/ft3. Also, take the specific heat of water to be c = 1.0 Btu/lbm-'F. The amount of power generated is kW.
Consider a residential heat pump that uses lake water as a heat source in the winter and a heat sink in the summer. The house is to be maintained at a winter temperature of 18oC and a summer temperature of 25oC. To do this efficiently, it is found that the indoor coil temperature should be 50oC in the winter, and 5oC in the summer. The outdoor coil temperature can be assumed to be 5oC during the winter months and 35oC during the summer. Compute for the COPs during (a) winter and (b) summer if it operates as a Carnot cycle heat pump.
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.
The heat removal rate from a refrigerated space and the power input to the compressor are 8.5kW and 1.7 respectively. The coefficient of performance of the refrigerant
The energy leakage per unit time is 0.6 kW for each 1℃ temperature difference between a house to be heated with a 1kW heat pump and the outdoor environment. The coefficient of performance of the heat pump used to keep this house at a constant temperature of 20℃; half of the theoretical maximum heat pump performance coefficient; Calculate the minimum outdoor temperature in ℃ so that this heat pump can meet the need and be used.
A 2 kW, 25 litre storage water heater is used to raise the tem perature of incoming cold water to a desired pre-set end use temperature ranging from 25°C to 75°C Assume that all the electrical energy has gone into heating the water. If the cold water temperature is 15°C and the end use temperature is 50°C. determine the time required to reach the end use temperature after the heater is switched on. The heat capacity cp for water is 4.2 kJ/kgK and density of water is 1000 kg/m3
The compressor of a refrigerator using refrigerant R134a draws 1.2 kW. Since the evaporation temperature in the evaporator is -22 °C and the condensation temperature in the condenser is 38 °C; (a) Plot this refrigerator system schematically with its elements and show it on the T-s and P-h diagram of the refrigeration cycle (b) The cooling power of the refrigerator (c) The amount of heat the refrigerator gives to the environment (d) Calculate the ideal and Carnot COP cooling values of this refrigerator.
Consider mixing some of the ice water with the hot water and vice versa so that the two reservoirs are closer to the same temperature. What do you think will happen to the mechanical/thermodynamic efficiency and ideal Carnot efficiency of the heat engine?
Assume that the heat engine receives steam at 782 Kelvin and releases the excess portion at 31 degrees Celsius. What would the heat engine's total efficiency be?