Book - School of Science and Technology

710 Indexdegree-hour 676heat pumps 558loads 71, 71, 79, 80±1, 82methods 405±8, 406±7plant 377towers 550±4, 652, 653COP see Coefficient ofperformanceCopperductwork 441water content 147Copper pipesembedded floor panels 184heat emission 610liquefied petroleum gasflow 313outflow design 606±7, 608primarydesign 599sizes 235, 612thermal expansion 255±9Cornish single-flue boilers 272Corrected effectivetemperature 10Correction factorsblinds 82consumption 123, 123design heat loss 123, 123ductwork 452floor heating 126shading 81Corrective maintenance 679Corrosion 229±31, 442Counterflow 271CP see Circulating pressureCritical point 531Cross flow evaporativecoolers 551, 551Cross-linked polyethylenetubes 184±5Cross-talk attenuation 469±70,470Cup burners 284±5, 285Currents (electrical) 142±3Curtain walling 50, 76Cylindershot water 578±84oil storage 302±3, 304Dailyservice tanks 308, 309Dailyuse (heating systems)666±7, 667Dampersair-conditioning 379, 380authority634characteristics 633, 634coils 392, 392control devices 633±5draught control 333, 333ductwork 445±6, 445±6fans 392, 392, 481, 482Data inputs, building energymanagement systems 655DDC see Direct digital controlDead water space 141Dead-band thermostats 626Dead-legs 600, 601Decibels 460±1, 461, 465Decrement factor 65Deep plan constructions 83±5Degree-days 665±6, 666, 684Degree-hours 676Dehumidificationcombined heat/powersystems 698desiccants 501±2, 698summer time 519±24, 520,523±4Deliverycoal 297±8liquid fuels 301±2liquefied petroleum gas 311natural gas 309Demand controlledventilation 369±70Demand units 602±3, 603Dense phase methods 299Deposition 231Desiccants 501±2, 698Designcalculations 514±29ductwork 442temperatures 177Desk-tops 396±8, 396, 424, 425Dew points 45, 318±19, 518Diamond break 439, 439Diaphragm air pressuregauges 473Dick, J. B. 64Diesel engines 693Diffuse solar radiation 72±3Diffusers 385±7, 385±6Digital instruments 473, 473Dip pipes 150Direct acting controls 622Direct air humidifiers 493Direct digital control (DDC) 623Direct expansion 533, 547Direct heating systemscategories 96, 97choice factors 116±19condensation 98control 112±13electrical 107±13, 142elements 142energyconsumption 672gaseous fuels 100±7liquid fuels 99±100, 99preheat 64solid fuel 98±9Direct hot water supplysystems 573±4, 574±5, 576Discharge rates 602Discount rates 685±6Displacement ventilation 398Distributed intelligence 656Diversityof motor ratings/loadings 92, 92Dixon, J. C. 12Door entrances 49Dosing (water treatments) 594Double duct systems 528Double glazing 36Double seat valves 630Double windows 36, 430Double-deflection 421, 422Down-feed pipework 616Down-flow air distribution412±14Down-flow air-conditioning 399Dr Arnott ventilator 349Drain cocks 276±7Draughtsboilers 283chimneys 326, 327, 330control 333, 333diverters 289dividers 335Draw-off points 602±4, 602±4Drives, fans 478±80, 479Dryair properties 166, 518back boilers 272bulb isotherms 94, 94bulb temperatures 377, 377,518coil free cooling 545±6core boilers 121, 127±8, 136,137resultant temperature 11±12Dual vertical spindle centrifugalpumps 210, 210Dual-duct systems 388±90, 649,650Dual-fuel burners 290, 291Ductworkauxiliaries 442±6, 442±6classification 438commissioning 470±3components 442±6, 442±6design 436±73fittings 442, 442±3, 451±2kitchens 366measurements 470±3noise dispersal 464±70pressure 447±57sizing chart 451sound control 458±64thermal insulation 457±8Dustcapacity487particles 484spot tests 486staining 429