If we wanted to supply all the electricity needs for New York City (NYC), with a popula- tion of about 10 million people, using photovoltaics technology, how much land area would we need? What other elements would be required for such an idea to work for NYC? How large of an investment would this involve, and how would the price of electricity in ¢ per kWeh have to increase in order to recover that investment in 10 years at an interest rate of 8%? For com

If we wanted to supply all the electricity needs for New York City (NYC), with a popula- tion of about 10 million people, using photovoltaics technology, how much land area would we need? What other elements would be required for such an idea to work for NYC? How large of an investment would this involve, and how would the price of electricity in ¢ per kWeh have to increase in order to recover that investment in 10 years at an interest rate of 8%? For com

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?

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Question 2. A household with electric resistance heating plans to switch from resistive heating to a ground source heat pump. Annual heat consumption of the house is 30 000 kWh. Investment cost of the heat pump is 21 000 €. Heat pumps COP is 4.0. How much are the annual savings compared to resistive heating after the change of the heating system (in kWh)? Average price of electricity is assumed to be 12 c/kWh. Round off your answer to one decimal digit and enter it without the unit.
1d) A house has an electric resistance heater with an efficiency of 95%. The house is in a cold climate with heating requirement of 120 million BTU/year and no need for air conditioning in the summer. If a 14 costs $10700, what heat pump with an HSPF is the payback time in years (2 significant digits) for the heating savings compared to keeping the current resistance heater assuming electricity costs of $0.12/kWh?
If we wanted to supply a world of 10 billion people with an average demand of electricity at 1 kW per person, what surface area of photovoltaic arrays would be required? Compare this to the size of a known city, state or country.
A 60 W light bulb is switched on for 18 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the cost to operate the bulb for 30 days. S0.8 O b. S2.52 S2.9 c. O d. S1.8 S3.24 Oe.
A photovoltaic system is installed. It is determined that the capacity factor of the installation is 21% over the course of a year. In that year it produced 7.73 MWh. What is the size of the installation (based upon a 365-day year)?
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) With a neat sketch discuss the working of a Grid-connected system for power generation and explain the functions of important components of this system?
A large electrical power station generates 1100 MW of electricity with an efficiency of 35.0%. (a) Calculate the heat transfer (in J) to the power station, Q, in one day. (b) How much heat transfer Q. (in J) occurs to the environment in one day? (c) If the heat transfer in the cooling towers is from 35.0°C water into the local air mass, which increases in temperature from 18.0°C to 20.0°C, what is the total increase in entropy (in J/K) due to this heat transfer? J/K (d) How much energy (in J) becomes unavailable to do work because of this increase in entropy, assuming an 18.0°C lowest temperature? (Part of Q. could be utilized to operate heat engines or for simple space heating, but it rarely is.)
How do you determine how much it will cost for electricity per year for the Nissan Leaf
3) When a person enters his house, which is completely closed in summer, he sees that the temperature is 34°C. After turning on the air conditioner, the temperature of the house becomes 22 °C within 15 minutes. Since the efficiency coefficient of the air conditioning system is 3.2, a) the electrical power drawn by the system, b) heat dissipated to the environment, and c) Assuming that it works 8 hours a day and the electricity price is 0.6 TL per kWh, find its cost for 4 months. Assume that the entire mass inside the house is equivalent to 1000 kg of air. For air, take Cv = 0.73 kJ/kgK, Cp= 1.0051 kJ/kgK.
A small company is considering an investment of $2000 that can save 3000 kWh of electricity per year at $0.15/kWh while the annual maintenance fee is $50. The project has a lifetime of 8 years and the salvage value is 10% of the initial investment. -:) What is the simple payback period (SPP) (in years)? Blank 1 (Your choices: 4.0, 4.2, 4.6, 5.0, 5.2) -:) With an annual discount rate is 12%, what is the discounted payback period (in years)? 6.5 (Your choices: 5.9, 6.5, 7.6, 8.1, 8.9) -:) With an annual discount rate is 12%, what is the benefit-cost ratio (BCR)? (Hint: Benefit = Annual saving – Maintenance; Cost = Initial investment - Salvage) Blank 3 (Your choices: 0.92, 1.04, 1.12, 1.25, 1.43) Blank 1 Blank 2 Blank 3 Add your answer Add your answer Add your answer
Demand factor is 0.75 on a Distributing Transformer that supplies a group of general power customers having a connected load of 186 kW. If the load factor for the group will average 45% and the energy sells at 3.5 cents per kWh, what will be the monthly (30-day) income from energy delivered through this transformer in Php/month; assuming an average motor efficiency to be 75%. (12) O 1,106.14 998.25 O 1,406.16 O 1,298.78 O 1,034.31