P

p-n junction diodes 482 package boilers 416, 418 parabolic 478 partial load storage 526 partial load system 529 partial storage systems 521, 529 par value or face value 668 passive air preheaters 215 passive infrared sensors (PIR) 365, 366

payback period 58, 468 PCB ballasts 383 peer-to-peer network 318 performance contracting 661, 710 performance contractors 2 periodic replacement 42 personnel protection 450 phase 277, 299

phase-change materials 480, 525

phosphoric acid (PAFC) 494

phosphoric acid fuel cell (PAFC) 170

photocells 364, 399

photographic light meter 428

photovoltaics 170

PID control 350

pipelines 558

Pitot tubes 429

PI control 350

planning 13

horizon 42, 63 plastic foams 442 plate-type 215 pneumatic 579, 581 pocket thermometers 429 poles 277

poll/response system 318 polyimide foams 442 potential 193

transformers 343 power coefficient 486 power factor 277, 279, 281, 399, 405 controller 291 meter 25, 427 power meter 282 power survey 281, 282 preferred stock 668 present-value cost analysis 466 present dollars 41 present worth 54 factor 50

savings investment ratio 54 pressure measurements 428 pressure sensors 343 pressure switches 343 proactive monitoring 501 process control 456 process wastes 489 process work 448

programmable logic controllers 315 project financing 668 project measures of worth 54 annual worth 54 internal rate of return 54 payback period 54 proton exchange membrane (PEM) 495

properties of thermal storage materials 197 proportional-integral (PI) control

316, 583 proportional control 350, 583

proportional output 618 protective coatings and jackets 442 protective countermeasures 631 proton exchange membrane (PEM) 170

public awareness 498 Public Utility Holding Company Act (PUHCA) 539, 546 of 1935 545 Public Utility Regulatory Policies

Act (PURPA) 177, 545 pulse accumulators 342 pulse width modulation 301, 350 pumps 714 purge section 214 purlin 230 PURPA 177, 545 pyrolysis 492

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