Same as Problem 9.1. If the life of the cogeneration system is 40 years, provide the optimal

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Same as Problem 9.1. If the life of the cogeneration system is 40 years, provide the optimal size of the cogeneration system for the hospital when the average interest rate is 8 percent and the inflation rate is 4 percent.

Problem 9.1

Provide a simple payback analysis for implementing a cogeneration system in a hospital. Assume the following characteristics for the cogeneration system:

• Fuel input rate: 8,000 Btu/kWh

• Heat recovery rate: 4,800 Btu/kWh

• Maintenance cost: $0.02/kWh

• Maximum electrical output: 200 kW, 300 kW, 400 kW, 500 kW, 600 kW, 700 kW, or 800 kW

• Installed equipment cost: $700/kW, $1,000/kW, or $1,500/kW Table 9.8 summarizes the energy usage and cost of the hospital. Assume that the boiler(s) efficiency is 75 percent. The heating value of diesel fuel is 140,000 Btu/gallon. Present the results in one graph: the payback period versus the equipment cost for various equipment sizes.

Table 9.8image text in transcribed

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