house is to be maintained at 20°C when the outside air is at -25°C. It is determined that 1800 kJ is required each minute to accomplish this.If an electric heat pump is used to supply this energy, determine the minimum theoretical work input for one day of operation, in kJ/day. Evaluating electricity at 13 cents per kWh, determine the minimum theoretical cost to operate the heat pump, in $/day. ($1 = 100 cents)If a heat pump whose coefficient of performance is 3.0 provides the required heating, determine the operating cost, in $/day

house is to be maintained at 20°C when the outside air is at -25°C. It is determined that 1800 kJ is required each minute to accomplish this.If an electric heat pump is used to supply this energy, determine the minimum theoretical work input for one day of operation, in kJ/day. Evaluating electricity at 13 cents per kWh, determine the minimum theoretical cost to operate the heat pump, in $/day. ($1 = 100 cents)If a heat pump whose coefficient of performance is 3.0 provides the required heating, determine the operating cost, in $/day

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

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 27RQ: How many Btu/h would be produced in a 12-kW electricheater?

See similar textbooks

Similar questions

A heat pump with a coefficient of performance of 3.5 provides energy at an average rate of 70000 kJ/h to maintain a building at 20 °C on a day when the outside temperature is -5 °C. If the electricity costs 8.5 cents per kWh. Assume heating is 24 hours a day. (1) Determine the actual operating cost in $/day. (2) Determine the minimum theoretical operating cost in $/day.
By supplying energy to a house at a rate of 25,000 kJ/hr, a heat pump maintains the temperature of the dwelling at 20 C when the outside air is at -10 C. If electricity costs 8 cents per kW-hr, determine the minimum theoretical operating cost to heat the house for 24 hours. $1.97 O $1.37 $1.75 O $1.51 O$1.64
For a refrigerator with automatic defrost and a top-mounted freezer, the electric power required is approximately 450 watts to operate. If the coefficient of performance is 3.2, Evaluating electricity at $0.15/kW⋅h, and assuming the unit runs 75% of the time, estimate the cost of one month's operation, in $.
If a house needs a minimum heat transfer rate of 75 kJ/h (i.e., 75 kJ of heat needs to be transferred into the house during one hour) to maintain a pleasant indoor temperature. If one wants to use a heat pump with a COP of 5.55 to fulfill this heat transfer rate, what is the corresponding electricity (in kWh) consumption to run such a heat pump for one hour?
A heat pump with a coefficient of performance of 3.5 provides energy at an average rate of 70,000 kJ/h to maintain a building at 20 deg C on a day when the outside temperature is -5 deg C. If electricity costs 8.5 cents per kWh, (a) determine the actual operating cost and the minimum theoretical operating cost, each in $/day. (b) compare the results of part (a) with the cost of electrical-resistance heating.
An electric resistance heater is used to provide space heating at an efficiency level of 100%. The electricity is sold at $0.13 per kWh. Question: How much money is needed if 1137.8 MBH is demanded? Hint: 1 MBH equals 1,000 btuh
A heat pump is used to extract heat from the outside atmosphere to heat the inside of a building. On a day when the outside air temperature is Tc°C, the heat pump is operating to a COP of 3.7, maintaining the inside temperature of the building at Th°C. If the building is losing heat at the rate of 53,709 kJ/hour in these conditions, determine how much power (kW) must be supplied to a heat pump? Keep two decimal places
If the energy crossing the boundary of a closed system is not heat, it must be work?
During the execution of a nonflow process by a system, the work per degree temperature increase is dW/dt= 85 ft-lb℉, and the internal energy may be expressed as U=15.5+0.75t ft-lb, a function of the temperature ℉. Determine the amount of heat if the temperature changes from 7C℉ ?? 295℉ in Btu.
A used car salesman is trying to sell you a car by telling you that the cars engine, operating between 25 degrees Celsius and 125 degrees Celsius, has an efficiency of 82%. What is the efficiency of the car?
A Carnot engine operating between 775 K and 305 K produces 51.18 Btu of work. Calculate the heat supplied. Group of answer choices 84.39 Btu 89.04 Btu 83.49 Btu 89.04 Btu
A canister of sevoflurane, an inhaled anesthetic, is warmed to room temperature over the course of 30 minutes. As the gas warms, it pushes on a movable piston with a force of 623 mN, increasing the volume of the gas by 16 cm^3. How much work was done by the gas? A. 0.03 CJ B. 0.27 CJ C. 2.7 CJ D. 270 CJ