Aheat pump with the COP of 2.1 supplies heat at the rate of 135 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

Aheat pump with the COP of 2.1 supplies heat at the rate of 135 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

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

Chapter1: Heat, Temperature, And Pressure

Section: Chapter Questions

Problem 6RQ: One British thermal unit will raise the temperature of _____ 1b of water _____F.

See similar textbooks

Similar questions

A heat pump with the COP of 3.0 supplies heat at the rate of 240 kJ/min. Determine the electric power supply to the compressor. Provide the answers to 3 decimal places and insert the unit symbol in kilowatts Consider a heat engine rate of heat production at 85 MW and at the same time reject heat to a sink at 40 MW. Which formula number is applicable to determine the power output and thermal efficiency of the engine.
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
If an engine that throws 200 kW of heat energy into the atmosphere produces 150 horsepower (hp), what is the efficiency of this engine? TIP: Horsepower is not included in the international unit system, you must convert it to kW.
For a hydroelectric plant, a hydraulic turbine-generator is installed at the site below the free surface. The turbine drives a generator for electricity. The elevation difference between the two free surfaces is . The power input from the fluid to the turbine is is . The shaft power output from the turbine is . (4)Determine the formula to express the relation between the efficiency of turbine , the efficiency of generator , and the combined efficiency __________ A. B. C. D.
Note: Use three decimal places and no need to input the unit. At a certain location, wind is blowing steadily at 7 m/s. Determine the power generation potential of a wind turbine with 80-m-diameter blades at that location. Also determine the actual electric power generation assuming an overall efficiency of 30 percent. Take the air density to be 1.25 kg/m3.( in kW)
the question asked for energy not the power so the answers should be in J which will be obtained by multiplying annual power by No of seconds in a year
The fluid power associated with a centrifugal pump is determined to be 93.39 Watts, if the efficiency of the pump is known to be 77.87 %, determine the required input shaft power in Watts. State the answer correct to two decimal places.
Convert between energy units. 4.99x10^3 kJ to kWh
Refrigerant-134a at 800 kPa and 25°C is throttled to a temperature of -14°C. Determine the pressure and the internal energy of the refrigerant at the final state. (Round the final answer to two decimal places.) The pressure of the refrigerant at the final state is ___ kPa. The internal energy of the refrigerant at the final state is __ kJ/kg.
Given the table of results, find the following. Give answers in KW. Please use tables and state which table you used Please show all working out Rate of heat transfer to evaporator from the chilled water: Answer : 0.627 kW ✓ Rate of heat transfer from condenser to the cooling water: Answer : 0.81kW✓ Rate of heat transfer to refrigerant in “Evaporator” using enthalpy values: Rate of heat transfer from refrigerant in “Condenser” using enthalpy values Work input from the compressor to the refrigerant using enthalpy values. Answer: 0.470kW ✓ COP from enthalpy changes across work input and evaporator COP from motor electrical power input as work and rate of heat transfer to the chilled water
Is this solution of the Q1 correct?
Change 2.223 kJ/kg-K to J/g-K