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Figure 713b
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Cogeneration Plants
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Cogeneration implies the simultaneous production of power combined with a bene cial use of the rejected heat from the power production or, inversely, the production of power from the waste heat from a thermal process, often an industrial furnace A rather common system uses a reciprocating engine to drive a generator, with the rejected engine heat at 180 to 220 F used for hot water heating functions A heat exchanger may be used to recover additional heat from the engine exhaust gases Gas- or oil- red turbines are also utilized to drive generators, with boilers to recover the available exhaust gas heat Engines produce more power per unit of fuel than do turbines, but have higher maintenance costs Where high-pressure steam is available, a steam turbine driving a generator or piece of equipment may be used as a pressure-reducing device with almost one-to-one conversion of heat to power This assumes that the lower-pressure steam can be ef ciently used Simple sketches of the systems described are given in Figs 717, 718, and 719 These are simple block diagrams to illustrate the concepts Design of complete plants requires the development of a fully
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Figure 714 Central plant serving a two-pipe distribution system
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Figure 715 Central plant serving a three-pipe distribution system
Design Procedures: Part 5
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Figure 716 Central plant serving a water-to-air heat pump system
Design Procedures: Part 5 Design Procedures: Part 5 219
Figure 717 Engine driven cogeneration
con gured ow diagram (P&ID) for the proposed system with subsequent design for each component Detailed plant design is beyond the scope of this book Cogeneration plants require a substantial feasibility study, for they involve major capital expenditure which will be recovered only over time under favorable economic conditions Absolute commitment of the owner to quali ed operation and planned maintenance is required Conservative projections of fuel and power price conditions should be used The opportunity to use reject heat should be real The very best systems in economic terms are the ones that can use all of the power, and all of the heat, all of the time Beware of the cost of standby systems If power delivery is critical, standby production must be available If the local utility is used for standby production, it usually
Figure 718 Turbine driven cogeneration
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Design Procedures: Part 5 220 Seven
Figure 719 Steamboiler / topping turbine cogeneration
has a signi cant cost factor Cogeneration implies being a personal utility company, at least to some degree Except on a large scale, or under unusual circumstances, it is dif cult to be more cost-effective than a utility company Utility companies usually respond to anomalies in rate schedules which favor cogeneration by changing the rate schedules As an example, remember an earlier day when power companies sold electricity for heating at discount rates The low rates lasted until demand caught up with supply 712 Summary
Central plants are the heart of the systems which produce heating and cooling capacity for buildings and complexes They range from small to large, simple to complex They involve a variety of inputs, manipulations, and outputs, each suited to the needs and resources of the speci c project Smaller plants should generally stay with simple schemes and standard equipment, while large systems can drift toward more sophisticated concepts and more tailored installations Economic evaluations should support design concepts, and long-term ease of operation and maintenance should be established as a key factor This chapter identi es plants for heating, cooling, and combinations of both There are many variations of the basic ideas offered There are additional plants related to compressed air, refrigeration, and water treatments which have energy implications, but are left to another discussion The HVAC systems designer will recognize plants as potential areas of specialty experience as assignments and interest allow References
1 ASHRAE Handbook, 2000 HVAC Systems and Equipment, Chap 7, Cogeneration Systems ; Chap 8, Applied Heat Pump and Heat Recovery Systems ; Chap 10,
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