$ 3,120,691

Table 26-20 Annual Cost Data for Case RE-1.

Table 26-20 Annual Cost Data for Case RE-1.

tion or load reduction can also affect central plant requirements, integrated studies that interactively consider all opportunities at a facility are a preferred analytical approach.

Following are two sensitivity analyses that demonstrate different results. The first shows how results would be different for a facility with somewhat varying conditions. The second shows how the expected implementation of interactive measures at this facility would alter the study results.

Sensitivity Analysis 1

The major factor impeding the economic performance of the reciprocating engine configuration in this potential application is the cost and inefficiency of utilizing the low-grade portion of its thermal energy. In this particular facility, the lack of a sufficient nearby hot water load increased the capital budget for this case by requiring the installation of a heat recovery hot water distribution system.

Alternately, in this case, the high-pressure natural gas line available to the project provides substantial benefit to the gas turbine configuration. In another location, where such facilities were not available, the gas turbine cogener-ation plant option would be burdened with the capital and operating cost of a gas compressor to raise the pressure to the 200 psig required by the DLN combustor of the gas turbine.

As a test of sensitivity, we will remove the hot water distribution system from the RE-1 plant configuration and require the addition of a booster gas compressor for each of the gas turbines included in the GT-1 plant configuration. This sensitivity assumes that gas is available to the facility at approximately 75 psig, the minimum gas pressure required by the reciprocating engines in the RE-1 configuration. For the GT-1 case, the simulation assigned an additional parasitic load of 75 kW for primary gas compression on each operating turbine and a total installed cost of $675,000 for the three compressors. This results in an increase in both capital cost and annual operating cost for the gas turbine system. Table 26-22 summarizes the economic performance for each option that results from running the system simulation for each of these revised cases. Notice that in this scenario, the reciprocating engine-based system now has a shorter simple


Project Cost

Annual Operating Cost



Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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