A refrigeration system is to be used to constantly maintain a space at -12°C in an industrial cooling space. The estimated cooling rate of 132764 kJ/h when the outside temperature is 26°C. Determine the minimum power required to drive this refrigerator if analysis is based on Carnot cycle. Provide answer to 2 decimal places and insert the unit symbol in kW. insert minus in answer and use 1°C=273 K if necessary

A refrigeration system is to be used to constantly maintain a space at -12°C in an industrial cooling space. The estimated cooling rate of 132764 kJ/h when the outside temperature is 26°C. Determine the minimum power required to drive this refrigerator if analysis is based on Carnot cycle. Provide answer to 2 decimal places and insert the unit symbol in kW. insert minus in answer and use 1°C=273 K if necessary

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.74P: A manufacturer in the United States wants to sell a refrigeration system to a customer in Germany....

See similar textbooks

Similar questions

Fill in the Dianks. A 5 Hp Carnot engine operates between temperature limits of 300°C and 50°C. Find the rate of heat wasted by the engine in kW. Qu **Express final answer in TWO DECIMAL PLACES. Do not round off in between solution. Type only the "numerical value". No need to include the unit and percent sign.
Thermal efficiency of a power cycle is 0.8. For the cycle, Qout = 250 kJ. Determine Qin in kJ. Enter the answer without units and round it if necessary to an integer. Do not use comma in the number.
Round everything to 4 decimal places. 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,
A heat pump with the COP of 3.8 supplies heat at the rate of 289 kJ/min. If a bar heater was used and the electricity cost R2.50 per kWh peak and 200 cents off-peak , how much would be saved using the heat pump for 7 days if the off-peak hours are from 22:00 hr to 6:00 hr for every day of the week. Provide the answers to 2 decimal places and insert the unit in Rands after the answer.
Provide a complete given and computation. Include all the decimals. A reheat cycle with two stages of reheating is executed with steam expanding initially from 20 MPa and 540C.The two reheater pressures are 3.8 MPa and 0.97 MPa, and the steam leaves each reheater at 540°C. Condensation occurs at 60°C. (a) For the ideal cycle and 1 kg/s of steam find Q,and e, (b) For the engine and 1 kg/s of steam find W and e.
Provide a complete given and computation. Include all the decimals. Steam engine with incomplete expansion receives saturated steam at 1.04 Mpa, expands it to 0.105 Mpa where release occurs. Exhaust is to a condenser at 40C. The actual engine uses 6070 kg/h of steam; it has a brake engine efficiency of 60% and a mechanical efficiency of 85%. The electric generator which it drives has an efficiency of 92%. (a) the indicated work in kW, indicated thermal efficiency and indicated steam rate, (b) the combined thermal efficiency and the combined steam rate.
A heat pump with the COP of 2.2 supplies heat at the rate of 269 kJ/min. Determine the electric power supply to the compressor. Provide the answers to 3 decimal places and insert the unit symbol in kilowatts.
What is, in MW, the power generated by a turbine that has a power coefficient equal to 0.24 when the wind speed is 10.3 m/s and the blades have a length of 34 m? Round off your answer to 2 decimal places and do not include the unit.
find the answer A piston-cylinder device provides 8 kJ of work to an external device. 2 kg of air contained inside the cylinder. If the internal energy of the air increases by 2 kJ/kg during the process, the heat transfer in kJ is Write the answer up to the nearest WHOLE NUMBER.
An air-cooled condenser has an expected U value of 30 W/m2∙K based on the airside. The condenser is to transfer 60 kW with an airflow rate of 15 kg/s entering at 35°C. If the condensing temperature is to be 48°C, what is the required airside area in m2? Round your answer to 2 decimal places.
An air-cooled condenser has an expected U value of 30 W/m2∙K based on the airside. The condenser is to transfer 60 kW with an airflow rate of 15 kg/s entering at 35°C. If the condensing temperature is to be 48°C, what is the required airside area in m2? Round your answer to 2 decimal places. heat transfer
Answer question 2 based on the results of question 1. You have a natural gas furnace in your home that used 78,500 cubic feet of natural gas for heating last winter. Your neighbor has a furnace that burns heating oil, and used 516 gallons of heating oil last winter. You can convert the natural gas and heating oil consumption data into Btu to determine which home used more energy for heating. Natural gas BTU: 1,028 Btu per cubic foot Oil BTU: 138,590 Btu per gallon Natural Gas BTU= 80698000 Btu Oil BTU = 71512440 Btu The home that used a natural gas furnace used more energy for heating. 2. You need a new furnace for your home, and you are comparing systems that use natural gas and heating oil. One factor to consider is the cost of fuel. You can compare the price of the fuels on an equal basis by dividing the price per unit of the fuels by the Btu content per unit of the fuels to get a price per million Btu. Assume Natural gas price = $10.50 per thousand cubic…