Building Services Engineering 5th Edition Handbook

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Ventilation and air conditioning 169 43. Which is not correct for natural ventilation in the UK? 1. Must generate at least 4 air changes/h. 2. Often associated with low-energy buildings. 3. Original means of ventilating pre-1950’s traditional brick buildings. 4. Always justifiable in this climate. 5. Often only provides up to 3 air changes/h. 44. What is meant by hybrid ventilation? 1. System has latest technology in computer control. 2. Only works in tall buildings. 3. Combines active control of natural ventilation with mechanical air movement systems. 4. Unnatural combination of mechanical systems with manually operated ventilators. 5. Combination of systems invented by Hyme Bridowski in 1935. 45. What drives the fan in a large air-handling unit? 1. Diesel engine prime mover. 2. Three-phase electric motor. 3. Single-phase synchronous alternating current motor. 4. 1000 V AC motor. 5. 240 V AC motor. 46. Which is a small fan drive motor, such as in a FCU? 1. DC variable-speed motor as they are lowest cost. 2. 415 V AC motor if they require around 850 W power output. 3. Three-phase for any size as this is the most energy-efficient type. 4. 240 V, three-phase synchronous electric motor. 5. 240 V, single-phase direct drive motor. 47. AHU chilled-water flow control is by: 1. Modulating damper. 2. Electronic control system. 3. Modulating water flow valve. 4. Manually set only once by the commissioning engineer. 5. All valves remain fully open to maximize available cooling during hot weather. 48. An office 15.0 m × 7.0 m × 2.8 m has 11.0 air changes/h from air supplied through a duct where it flows at a velocity of 8.5 m/s. Which two answers are correct? 1. Supply air flow rate is 1.20 m 3 /s. 2. Supply air flow rate is 750.0 l/s. 3. Supply air flow rate is 0.9 m 3 /s. 4. Duct dimensions are 325 mm × 325 mm. 5. Duct dimensions are 650 mm × 325 mm. 49. A retail shop 22.0 m × 6.5 m × 3.5 m has 7.5 air changes/h from air supplied through a duct where it flows at a velocity of 9.5 m/s. Which two answers are correct? 1. Supply air flow rate is 0.085 m 3 /s. 2. Supply air flow rate is 1043 l/s.
170 Ventilation and air conditioning 3. Supply air flow rate is 10.4 m 3 /s. 4. Duct dimensions are 335 mm × 335 mm. 5. Duct dimensions are 990 mm × 990 mm. 50. A conference hall 55.0 m × 27.0 m × 3.6 m has 15.0 air changes/h from air supplied through a duct where it flows at a velocity of 4.5 m/s. Which two answers are correct? 1. Supply air flow rate is 22.275 m 3 /s. 2. Supply air flow rate is 5940 l/s. 3. Supply air flow rate is 2.228 m 3 /s. 4. Duct dimensions are 1000 mm × 5000 mm. 5. Duct dimensions are 2000 mm × 2475 mm. 51. Which of these statements on air-conditioning systems is correct? More than one answer is correct. 1. Air-handling units are usually the largest item of plant. 2. Air-handling units are always manufactured off-site and delivered in one piece to any building. 3. Some air-handling units are large enough for a person to walk inside. 4. Air-handling units are where the room supply air is conditioned. 5. Air-handling units do not contain any moving parts. 52. Why are motorized dampers fitted into the outside air and return air intakes to the airhandling unit in a large air-conditioning system? 1. Close of the air supply during a storm. 2. Stop sucking dust into the building. 3. Vary the winter and summer intake of outdoor air. 4. Shut the air conditioning down at night. 5. Fully open up during fire mode. 53. Identify which statement correctly describes the operation of the vapour-compression refrigeration cycle: 1. A compressor pump drives liquid refrigerant around the system. 2. Refrigerant condenses at 20 ◦ C to reject heat from the building. 3. Refrigerant gas vaporizes at 30 ◦ C and at high pressure to absorb heat from the building. 4. An expansion valve raises refrigerant gas pressure. 5. Heat is absorbed from the building by vaporizing refrigerant at low pressure at around 5 ◦ C. 54. Which statement is correct? 1. A cooling tower cannot be a source of infectious bacteria. 2. The cooling tower rejects heat from the building to the outdoor atmosphere. 3. Cooling towers are only operational during the summer. 4. Cooling towers sprays mains water into the air. 5. Cooling-tower water systems are occasionally dosed with biocide. 55. What does VRV mean? 1. Variable refrigerant volume. 2. Volume refrigerated valve.
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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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Page 147 and 148: 126 Ventilation and air conditionin
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Page 199 and 200: 6 Hot- and cold-water supplies Lear
Page 201 and 202: 180 Hot- and cold-water supplies Wa
Page 203 and 204: 182 Hot- and cold-water supplies po
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
Page 213 and 214: 192 Hot- and cold-water supplies an
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
Page 235 and 236: 214 Soil and waste systems 40 mm wa
Page 237 and 238: 216 Soil and waste systems Table 7.
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220 Soil and waste systems 3. Long
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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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Building Services Engineering 5th Edition Handbook

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