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Energy Systems Engineering Evaluation and Implementation [EXP-58308]
65 SOLVED PROBLEMS
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Question: 3.2
A cash flow stream consists of an annuity of $100,000 earned for 10 years at 7% interest. What is the future value of this stream at the end of term? What is the value of the factor (F/A, i%, N) in this case?
Verified Answer:
Substituting A = $100,000, N = 10, and i = 7% into...
Question: 6.9
A cogeneration system of the type shown in Fig. 6-9 ejects steam from the boiler at 7 MPa and 500°C. (Use numbering notation in the figure.) The steam can either be throttled to 500 kPa for injection into the process heater, or expanded in a turbine, where it can be partially expanded to 500 kPa
Verified Answer:
First, calculate all known values of enthalpy that...
Question: 7.2
A family consumes 400 kWh/month of electricity and wishes to buy sequestration offsets from an organization that plants trees in Africa. The organization charges $19.00 per tree, and estimates that each tree will on average absorb 730 kg CO2 over its lifetime. The electricity consumed emits CO2 at
Verified Answer:
(a) The average emissions per MWh of electricity i...
Question: 7.1
A given species of tree can sequester 2 kg of CO2/year·m^2 of planted area, in growing conditions where average sunlight makes available 100 W/m^2, taking into account the night/day and seasonal cycles, as well as variability in the weather. (a) How much energy is required to convert the CO2 via
Verified Answer:
(a) First calculate the number of molecules of CO[...
Question: 13.5
A hydrogen fuel cell operates at 25°C and pressure of 100 kPa, using a supply of pure hydrogen and oxygen from ambient air. The partial pressure of the water that forms from the hydrogen and oxygen is 30 kPa. (a) What is the voltage drop across the fuel cell? (b) If the supply of air is replaced
Verified Answer:
(a) Given the initial data, partial pressures for ...
Question: 14.1
A metropolitan region generates 7.5 billion passenger · km of transportation demand per year and is experiencing 2% per annum growth in total passenger · km, and a 0.5% decline in energy intensity of passenger ·km. Current energy intensity of automobile travel and public transportation is 2200 kJ
Verified Answer:
(a) For the current year, the total energy consump...
Question: 3.3
A municipality is considering an investment in a small-scale energy system that will cost $6.5 million to install, and then generate a net annuity of $400,000/year for 25 years, with a salvage value at the end of $1 million. (a) Calculate the net worth of the project using simple payback.
Verified Answer:
(a) The net worth of the project by the simple pay...
Question: 9.2
A normal beam of radiation In,b has a flux value of 350 W/m^2. What is the flux reaching a solar surface facing due south and tilted south by 25° at 11 a.m. on the summer solstice at 42° north latitude?
Verified Answer:
The surface faces south so the value of the surfac...
Question: 8.2
A nuclear power plant, whose capital cost has been fully repaid, operates with a total of 155,000 kg of uranium (or 175,800 kg of UO2) in its reactor core, which has a U-235 concentration of 2.8%. Each year 1/3 of the reactor fuel is replaced at a cost of $40 million, which has built into it $0.001
Verified Answer:
We solve this problem by first calculating the the...
Question: 3.1
A particular model of car costs $17,000 in 1998 and $28,000 in 2005, given in current dollars for each year. How much are each of these values worth in constant 2002 dollars? Use the U.S. CPI values from Table 3-1.
Verified Answer:
Values from the table are used to convert to const...
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