For ESMP-in-Exile: Demand & Production Figures from April 30, 2013

4.30.13

From the Q&A

Q6: You mentioned that thermal needs aren’t sufficient to support production of all of your on site electricity needs. This surprises me ­ as I would think the campus would have a high thermal load (dorms, heating, cooling).

A6:

Campus Electric and Steam Demands.

Campus electric demand ranges from about 50 MW in the summer to about 30 MW in the winter. Chilled water is produced using electric chillers.

Campus steam demands are primarily heating and are provided by both high pressure (150psig) and low­ pressure (13 psig) distribution systems. Campus high and low­pressure steam demands are about the same; each range from a low of 40,000 lb/hr in the summer to a high of 200,000 lb/hr in the winter.

Electric and Steam Production.

­ West Campus Steam Plant. At PSU West Campus Steam Plant co­gen, low pressure system is served by backpressure steam turbine­ generators as well as turbine driven feed­water and lube­ oil pumps and turbine driven draft fans. All turbines exhaust steam to the low pressure campus supply.

Turbine­ Generator Set steam conditions: Turbine inlet: 240/540 psig/oF. Turbine outlet: 13/540 psig/oF

Each turbine produces about 35 lb­steam/kW­hr of electricity generated. T­G2 is rated at 2.5 mW. T­G3 is rated at 3.5MW

At these steam rates, electricity production ranges from 1,100 kW­h to 5,700 kW­h. With the contribution of the feed­water, lube ­oil pumps and draft fans to the low­ pressure system, the steam produced by the turbine­ generator sets is even less.

Typical summer electric generation is about 500 kW. Winter generation is about 3.5 MW. Far below that of the campus electric demand.

East Campus Steam Plant. At East Campus Steam Plant co­gen, high pressure system is served by combustion turbine with heat recovery steam generator (CT/HRSG). The 7mW Solar Taurus 70 coupled with HRSG produces about 30,000 lb/hr steam without duct firing and about 117,000 lb/hr steam with duct firing. While additional CTs would possibly meet the electrical demands, they would be way oversized for the low thermal loads in the summer.

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