Building Services Engineering 5th Edition Handbook

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Ventilation and air conditioning 171 3. Vacuum recycled vanadium. 4. Variable refrigeration value. 5. Valid refrigerant valence. 56. How is the coefficient of performance, COP, of a refrigeration system maximized? 1. Discharging waste heat to the atmosphere at the highest temperature. 2. Discharging waste heat to the atmosphere at the lowest temperature. 3. Evaporating refrigerant at the lowest possible temperature. 4. Evaporating refrigerant at the lowest possible temperature. 5. Using the smallest possible temperature increase between evaporation and condensation of the refrigerant. 57. Which is correct about air pressurization of buildings? 1. Supply and exhaust air quantities must be equal. 2. Outdoor wind environment creates internal air pressurization. 3. When exhaust air volume exceeds supply air quantity, building is pressurized. 4. When exhaust air volume exceeds supply air quantity, building is depressurized. 5. Supply air fans do not create building air pressurization. 58. Which are the two types of heat transfer taking place during ventilation of a building? 1. Latent and radiant. 2. Sensible and convection. 3. Latent and conduction. 4. Sensible and radiant. 5. Sensible and latent. 59. Which does not correctly describe heat transfer? 1. Sensible heat is removed from air when water droplets spray into warm air and vaporize. 2. Latent heat transfer occurs when water is evaporated into steam vapour. 3. Evaporative coolers and cooling towers rely on latent heat transfer to remove sensible heat from the water passing through. 4. Evaporative coolers work less efficiently in warm humid climates. 5. Cooling towers already have saturated air, so there is no latent heat transfer with the circulating water. 60. Why is a psychrometric chart used? 1. Shows temperature profile through a wall. 2. Calculates latent heat demand. 3. Calculates sensible heat load on the building. 4. Shows physical properties of humid air. 5. Plots air dry-bulb temperature against atmospheric pressure. 61. Which is correct for sensible heating processes on a psychrometric chart? 1. Curved line between two dry-bulb temperatures. 2. Vertical straight line. 3. Any line at 45 ◦ to the horizontal. 4. Horizontal line. 5. A line concentric with the dew-point curve.
172 Ventilation and air conditioning 62. Which of these is a sensible heating process line on a psychrometric chart? 1. Straight line between two dry-bulb temperatures at constant specific enthalpy. 2. Line between two dry-bulb temperatures at constant percentage saturation. 3. Straight line between two dry-bulb temperatures at constant moisture content from right to left. 4. Angled straight line between two dry-bulb temperatures from left to right. 5. Straight line between two dry-bulb air temperatures at constant moisture content from left to right. 63. Which of these does not correctly describe a cooling process line on a psychrometric chart? 1. Cannot be precisely drawn on the chart due to variation of air percentage saturation within the air spaces around a cooling and dehumidification coil. 2. Only the end points of the line are known precisely. 3. Line drawn represents overall picture of cooling process through the coil. 4. Curved line downwards from right to left between two moisture contents. 5. Straight line angled downwards between two pairs of coordinates from air dry-bulb temperature and moisture content. 64. Which of these describes the leaving air condition when warm humid air enters a chilledwater cooling coil? 1. Higher moisture content. 2. Higher specific enthalpy. 3. Same moisture content. 4. Lower dry-bulb air temperature and around 90% saturation. 5. 100% saturated air at same moisture content. 65. Which correctly describes cooling processes on a psychrometric chart? 1. Reduces percentage saturation. 2. Reduces air wet-bulb temperature. 3. Maintains air at constant specific enthalpy. 4. Maintains constant air wet-bulb temperature. 5. Does not change air specific volume. 66. Which does not correctly describe humidification processes on a psychrometric chart? 1. Water sprays onto a chilled-water cooling coil. 2. Steam injection provides better air cleanliness. 3. Straight line moving away from 100% saturation curve. 4. Straight line moving towards the 100% saturation curve. 5. Adiabatic saturation line. 67. Which is correct about a VAV air-conditioning system? 1. Setting a minimum supply air flow rate at each terminal unit avoids dumping cool air onto occupants. 2. Always requires terminal reheat coil. 3. Stands for vortices-activated valve. 4. Stands for volume-activated variable flow system. 5. One terminal unit serves two zone orientations.
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Building Services Engineering
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Building Services Engineering Fifth
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Contents Preface to fifth edition A
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Contents vii Sick building syndrome
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Contents ix Circuit design 294 Cabl
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Preface to fifth edition Building S
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Acknowledgements I am particularly
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Units and constants xv Table 2 Mult
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Symbols xvii Symbol Description Uni
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Symbols xix Symbol Description Unit
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2 Built environment Introduction Th
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4 Built environment Ventilation The
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6 Built environment (a) At full occ
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8 Built environment Table 1.2 Compa
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10 Built environment Because of the
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12 Built environment Visual display
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14 Built environment v = 7 m/s t a
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16 Built environment 1.4 Sling psyc
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18 Built environment 1.7 Thermistor
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20 Built environment t res = t g (1
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22 Built environment great care wit
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24 Built environment 16. An hotel l
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26 Built environment 37. Are any of
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28 Built environment building has a
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30 Built environment 73. What was t
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32 Energy economics Introduction Bu
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34 Energy economics 16. air-to-air
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36 Energy economics 1 kWh = 1 kWh
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38 Energy economics 2. Heat transfe
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40 Energy economics For solid fuel
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42 Energy economics gas cost = 1.80
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44 Energy economics Table 2.5 Carbo
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46 Energy economics EXAMPLE 2.8 A h
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48 Energy economics annual cost = u
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50 Energy economics EXAMPLE 2.12 Ex
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52 Energy economics l = 0.035 ( 1 0
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54 Energy economics Table 2.11 Valu
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56 Energy economics From Table 2.4
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58 Energy economics 3. Minimum outs
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3 Heat loss calculations Learning o
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62 Heat loss calculations Table 3.1
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64 Heat loss calculations Table 3.6
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66 Heat loss calculations Where onl
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68 Heat loss calculations The venti
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70 Heat loss calculations The surro
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72 Heat loss calculations The speci
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74 Heat loss calculations where R m
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76 Heat loss calculations The addit
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78 Heat loss calculations operation
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80 Heat loss calculations 2. The fo
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82 Heat loss calculations internal
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84 Heat loss calculations 27. Which
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86 Heating Key terms and concepts a
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88 Heating 4.2 Electrically heated
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90 Heating Sheet steel case Removab
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92 Heating Floor finish Screed with
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94 Heating Flue Return air plenum F
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96 Heating Table 4.1 Classification
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98 Heating Table 4.2 Heat output fr
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100 Heating Table 4.3 Flow of water
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102 Heating and, maximum available
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104 Heating This means that one vol
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106 Heating Performance testing A r
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108 Heating Electrical power genera
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110 Heating Combined heat and power
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112 Heating 3. A building energy ma
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114 Heating Connections are made to
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116 Heating remotely the MWh consum
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118 Heating 13. The two-pipe heatin
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Page 147 and 148: 126 Ventilation and air conditionin
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Page 199 and 200: 6 Hot- and cold-water supplies Lear
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Page 205 and 206: 184 Hot- and cold-water supplies Ce
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Page 209 and 210: 188 Hot- and cold-water supplies 0.
Page 211 and 212: 190 Hot- and cold-water supplies 53
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Page 215 and 216: 194 Hot- and cold-water supplies Ta
Page 217 and 218: 196 Hot- and cold-water supplies Ta
Page 219 and 220: 198 Hot- and cold-water supplies (a
Page 225 and 226: 204 Hot- and cold-water supplies 49
Page 227 and 228: 206 Soil and waste systems Introduc
Page 229 and 230: 208 Soil and waste systems Open to
Page 231 and 232: 210 Soil and waste systems 7. Bends
Page 233 and 234: 212 Soil and waste systems The inte
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Page 239 and 240: 218 Soil and waste systems 50 mm ve
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222 Surface-water drainage Table 8.
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224 Surface-water drainage Rectangu
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226 Surface-water drainage The solu
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228 Surface-water drainage 7. A PVC
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230 Below-ground drainage Design ca
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232 Below-ground drainage Manhole:
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234 Below-ground drainage From Fig.
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236 Below-ground drainage storage v
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238 Below-ground drainage 14. The f
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240 Condensation in buildings mould
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242 Condensation in buildings The w
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244 Condensation in buildings EXAMP
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246 Condensation in buildings This
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248 Condensation in buildings Tempe
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250 Condensation in buildings and,
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252 Condensation in buildings EXAMP
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254 Condensation in buildings Tempe
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256 Condensation in buildings For t
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258 Condensation in buildings 4. Ev
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11 Lighting Learning objectives Stu
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262 Lighting Table 11.1 Typical val
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264 Lighting Light sources 9 9 9 Wi
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266 Lighting Utilization factor The
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268 Lighting From Table 11.3, for a
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270 Lighting Table 11.4 Lamp data.
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272 Lighting number of lamps = 12.8
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274 Lighting 3. Sketch and describe
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276 Lighting 4. Insufficient inform
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278 Lighting 3. 800 lm/m 2 . 4. 260
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12 Gas Learning objectives Study of
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282 Gas Open to atmosphere Rubber p
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284 Gas EL = (1.25 × 34) m = 42.5
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286 Gas become exhausted. SNG will
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288 Gas are ignited and an air flow
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290 Gas 3. The pipe from a gas mete
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292 Electrical installations Key te
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294 Electrical installations curren
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296 Electrical installations 1 Volt
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298 Electrical installations power
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300 Electrical installations For1mm
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302 Electrical installations Table
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304 Electrical installations Incomi
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306 Electrical installations energi
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308 Electrical installations Starte
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310 Electrical installations Ethyle
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312 Electrical installations Test o
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314 Electrical installations Joint
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316 Electrical installations 4. 100
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318 Electrical installations 39. Wh
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320 Electrical installations 51. Wh
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322 Room acoustics 20. understand t
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324 Room acoustics pump blades and
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326 Room acoustics ceiling, Q is 4.
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328 Room acoustics Table 14.2 Solut
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330 Room acoustics Table 14.3 Fan s
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332 Room acoustics Table 14.4 Illus
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334 Room acoustics (Sound Research
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336 Room acoustics The target room
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338 Room acoustics Table 14.6 Noise
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340 Room acoustics 100 90 80 70 Sou
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342 Room acoustics 24. A forced-dra
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344 Room acoustics The room directi
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346 Room acoustics 3. Multiple sour
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348 Room acoustics 55. Which is not
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350 Fire protection computer monito
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352 Fire protection halogen gas, wh
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354 Fire protection the reach of tu
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356 Fire protection Range pipe Spri
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358 Fire protection Fire compartmen
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360 Fire protection 16. Which are c
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362 Plant and service areas Key ter
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364 Plant and service areas 2.0 1.5
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366 Plant and service areas Fuel st
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368 Plant and service areas a minim
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370 Plant and service areas An unde
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372 Plant and service areas Air cha
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374 Plant and service areas 100 mm
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376 Plant and service areas Fire co
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378 Plant and service areas Table 1
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380 Plant and service areas 11. Wha
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17 Mechanical transportation Learni
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384 Mechanical transportation Table
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386 Mechanical transportation Crowd
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388 Mechanical transportation Hydra
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390 Mechanical transportation 4. Co
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18 Question bank Learning objective
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394 Question bank 8. Which correctl
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396 Question bank 5. This building
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398 Understanding units Questions 1
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400 Understanding units 15. Which i
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402 Understanding units 29. Which o
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404 Understanding units 43. Which i
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Appendix: answers to questions Chap
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408 Appendix Chapter 3 Heat loss ca
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410 Appendix 4. 0.007469 kg H 2 O/k
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412 Appendix 32. 5 33. 5 34. 3 35.
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414 Appendix 23. Lighting 1200 h/ye
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416 Appendix 27. 37 dB. 28. 39 dB.
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418 Appendix 15. 5 16. 2 17. 5 18.
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References Action Energy, Departmen
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Index Absorption 154, 324 Absorptio
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424 Index Gas burner controls 289 G
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426 Index Sensible heat gains 137 S
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