BSRIA definitions J - Z

This list provides links to definitions created by BSRIA that have been published on Designing Buildings, along with the date added.

This page includes definitions J to Z. Click here to see definitions A to I.

See also a list of articles by BSRIA on Designing Buildings.

1. Jointing compound. July 2022.
2. Kinetic energy. January 2022.
3. KNX. July 2023
4. Lead-acid battery. January 2022.
5. Life cycle cost model. July 2022.
6. Life Cycle Maintenance. July 2022
7. Limescale. November 2021
8. Linear actuators. August 2023.
9. Linear load. October 2024
10. Lithium-ion battery. January 2022
11. Looping. December 2023.
12. LonTalk. July 2023
13. ‎LoRaWAN. October 2024
14. Low temperature thermal storage. January 2022.
15. Low temperature hot water. November 2021
16. Lowest working pressure component. November 2022
17. Luminaire. July 2021.
18. Lump sum cost. July 2022.
19. Machine learning. October 2024.
20. Machining. September 2024
21. ‎Magnetite. November 2021
22. ‎Make-up water. November 2021
23. Malware. August 2023.
24. Manufacturers' drawings. June 2021.
25. Maximum demand load shedding. July 2023
26. Maximum working pressure. November 2022
27. Mechanical interlock. December 2023.
28. Mechanical tachometer. January 2024.
29. Metabolic rate. March 2023
30. Metallic, insulated flexible ductwork. December 2023.
31. Metallic, uninsulated flexible ductwork. December 2023.
32. Microbially Influenced Corrosion. July 2022.
33. ‎Microbiologically influenced corrosion. November 2021
34. Microorganism. November 2021
35. Milling. September 2024
36. Millscale. April 2021.
37. Mixed-mode ventilation. July 2021.
38. Modbus. July 2023
39. Modular boiler. June 2021.
40. Motorised on/off valve. May 2023
41. National Fire Protection Association. September 2021
42. Natural convector. July 2022.
43. Net positive suction head. November 2022
44. Network hub. August 2023.
45. Network router. August 2023.
46. Network switch. August 2023.
47. Neutral conductor sizing for commercial loads. October 2024
48. Neural network. October 2024.
49. Neurodiversity. February 2025.
50. Neutral point. November 2022.
51. Neutral-to-earth voltage. October 2024
52. Night setback. July 2023
53. Nitrile rubber. July 2022.
54. Noise rating. March 2024.
55. Nominal Bore. July 2022.
56. Non-critical maintenance. July 2022
57. Non-linear load. October 2024
58. Non-metallic, insulated flexible ductwork. December 2023
59. Non-metallic, uninsulated flexible ductwork. December 2023
60. Notching. October 2024
61. Occupied zone. August 2022.
62. Ongoing commissioning. March 2025
63. ‎OneM2M. October 2024
64. ‎Open Connectivity Foundation. October 2024
65. Open loop heat pump system. January 2022
66. Open protocol. July 2023
67. Open vented system. November 2022.
68. Operation and maintenance audit. October 2024.
69. Operation and maintenance audit plan. October 2024.
70. Operation and maintenance auditor. October 2024.
71. Operation and maintenance audit toolkit. October 2024.
72. Operational audit. October 2024.
73. Optical tachometer. January 2024.
74. Organisation specific maintenance. July 2022
75. Orifice plate (OP) flow measurement device. August 2022.
76. Overvoltage. October 2024
77. Ozone disinfection. July 2022.
78. P-alkalinity. November 2021
79. Passivator. April 2021.
80. ‎Pathogenesis. February 2025.
81. Penetration seal. April 2021.
82. Pepper pot corrosion July 2022.
83. Perforated air collectors. November 2021
84. ‎PHI Low Energy Building Standard. March 2024.
85. Photocatalytic filters. August 2022.
86. Photoelectric control. July 2023
87. ‎Pitot tube. January 2024.
88. Pipe closure device. April 2021.
89. ‎Pitting. November 2021
90. Planned maintenance. March 2024.
91. Plasticisation. April 2021.
92. Plate heat exchanger. July 2022.
93. Potential Energy. January 2022
94. Power factor correction. October 2024
95. Power fail actuators. August 2023.
96. Power frequency variations. October 2024
97. Powered flow hood. January 2024.
98. ‎Pre-commissioning. January 2024.
99. ‎Pre-functional test. March 2025
100. Pre-functional testing. July 2024.
101. ‎Pressure and leakage testing. January 2024.
102. Pressure independent control valves. April 2021.
103. Pressure regulating valve. July 2022.
104. Pressurisation unit. November 2022.
105. Primary electricity. March 2022.
106. Primary filters. August 2022.
107. Primary stakeholder. June 2022
108. Process carbon dioxide emissions. March 2022.
109. Professional team. June 2022
110. ‎Project Haystack. October 2024
111. Project success criteria. April 2021.
112. ‎Proof luminaire. July 2021.
113. ‎Proportional balancing. January 2024.
114. Proportional control. July 2023
115. Proportional plus integral control. July 2023
116. ‎Proportional plus integral plus derivative control. July 2023
117. Prosumer. March 2024.
118. Proxy server. July 2023
119. Pseudomonad. April 2021.
120. Pulsed input actuator. August 2023.
121. Pumped drainage. July 2022.
122. ‎Pumped hydro. January 2022.
123. Quarter turn ball valve. July 2022.
124. Raised access floor. December 2024
125. Raised access plenum floor. December 2024
126. Rangeability. July 2023
127. Rapid voltage changes. October 2024
128. Reactive load. October 2024
129. Recessed luminaire. July 2021.
130. Re-circulation air. August 2022.
131. Recurring cost. July 2022.
132. Recycled content. March 2022.
133. Reduced pressure zone valve. July 2022.
134. ‎Regulating flow rates. January 2024.
135. Re-usable filters. August 2022.
136. Resistive load. October 2024
137. Reset control. July 2023
138. Reverse cycle heat pump system. January 2022
139. Rigid construction. April 2021.
140. Roll filter. August 2022.
141. Rotating vane anemometer. January 2024.
142. Rotary actuators. August 2023.
143. Rotary shoe valve. August 2023.
144. Room air cleaners. August 2022.
145. Room-based heat pump. July 2021.
146. Rosette corrosion. July 2022.
147. Run to Fail Maintenance. July 2022.
148. ‎Salutogenesis. February 2025.
149. Savings-to-investment ratio. July 2022.
150. ‎Seasonal commissioning. January 2024.
151. Second fix. March 2024.
152. Second party operation and maintenance audit. October 2024.
153. ‎Secondary filters. August 2022.
154. Secondary stakeholder. June 2022
155. Security tracking. July 2023
156. Self-discharge. January 2022
157. Sentinel taps. July 2022.
158. Sensitivity studies. October 2024.
159. ‎Sequestrant. April 2021.
160. Serogroup. July 2022.
161. Service support construction. April 2021.
162. Sewage heat pump. January 2022.
163. Shower mixers. July 2022.
164. Sign-off. March 2025
165. ‎Simulation. October 2024.
166. Single opening. April 2021.
167. Single-phase v three-phase ac current systems. August 2021
168. ‎Single-sided ventilation. July 2021.
169. Singularity. October 2024.
170. Sintering. September 2024
171. Site acceptance testing. March 2025
172. Sleeve. April 2021.
173. Smart actuators. August 2023.
174. Smart hub. July 2023
175. Smart smoke sensors. August 2023.
176. Smart temperature sensor. August 2023.
177. Smart thermostat. August 2023.
178. Soft water. November 2021
179. Solar air heating. November 2021
180. ‎Solar cooling. November 2021
181. Solar water heating. November 2021
182. Soldering flux. July 2022.
183. Spa pool. July 2022.
184. Specific fan power. July 2024
185. Spring actuators. August 2023.
186. Spyware. August 2023.
187. Stachybotrys. January 2025.
188. Stage 2 cost plan. June 2021.
189. Stage 2 design report. June 2021.
190. Stage 3 cost plan. June 2021.
191. Stage 3 design report. June 2021.
192. Stagnation. July 2022.
193. Static completion. January 2024.
194. Static height. November 2022.
195. Static pressure. July 2024.
196. Stereolithography. September 2024.
197. Sterilise. July 2022.
198. STL file. September 2024
199. Strategic operation and maintenance audit. October 2024.
200. Stop valve. July 2022.
201. Stroboscope. January 2024.
202. Strong AI. October 2024.
203. Study period. July 2022
204. Subtractive manufacturing. September 2024
205. Success criteria. June 2021.
206. Surface water cooling. November 2021
207. Surfactant. April 2021.
208. ‎Susceptible population. July 2022.
209. ‎Suspended solids. November 2021
210. Sustained interruptions. October 2024
211. ‎System boundaries. March 2022
212. ‎System continuous operational performance. March 2025
213. ‎System expansion. March 2022.
214. System lag. July 2023
215. Temperature and pressure relief valve July 2022.
216. Terminal. August 2022.
217. Test pack. March 2025
218. Thermal anemometer. January 2024.
219. ‎Thermal response. August 2022.
220. Thermoelectric actuators. August 2023.
221. Thermostatic bypass valve. July 2022.
222. Thermostatic radiator valve. May 2023.
223. ‎Thermosyphon. November 2021
224. Three-port motorised valve. July 2023
225. Three-port control valve. June 2023
226. Three-port valve. June 2021.
227. ‎Total dissolved solids. November 2021
228. ‎Total pressure. July 2024.
229. ‎Total viable count. November 2021
230. Transient voltage. October 2024
231. Transformer. July 2021.
232. Tri-generation. November 2021
233. Triplen harmonics. October 2024
234. Trojans. August 2023.
235. Trunking. April 2021.
236. Tubercle. November 2021
237. Turing test. October 2024.
238. Turning. September 2024
239. Two-port control valve. June 2023
240. Two-port motorised valve. July 2023
241. Two-port valve. June 2021.
242. Two-port (variable flow) control strategy. July 2022.
243. Ultraviolet disinfection. July 2022.
244. Ultraviolet germicidal irradiation. August 2022.
245. Under-deposit corrosion. November 2021
246. Underfloor void. December 2024
247. Undervoltage. October 2024
248. Universal input. July 2023
249. Universal output. July 2023
250. Up-and-down luminaire. July 2021.
251. Upstream burden. March 2022.
252. Vacuum relief valve. July 2022.
253. Value engineering report. April 2021.
254. Valve authority. March 2024.
255. Valve characterisation. June 2023
256. Variable gas cushion expansion vessel. November 2022.
257. Variable occupancy controller. July 2021.
258. Velocity pressure. July 2024.
259. Virus. August 2023.
260. Voltage interruptions. October 2024
261. Voltage sag. October 2024
262. Voltage swell. October 2024
263. Waste product. March 2022.
264. Waste-to-energy. January 2022.
265. Water fittings. July 2022.
266. Water stratification. July 2022.
267. Water systems. March 2025
268. Water treatment programme. November 2021.
269. Water undertaker. November 2022.
270. Waveform distortion. October 2024
271. Waveform distortion noise. October 2024
272. Weak AI. October 2024.
273. Weight sensor. November 2022.
274. WELL Air. February 2025.
275. WELL Community. February 2025.
276. WELL Light. February 2025.
277. WELL Materials. February 2025.
278. WELL Mind. February 2025.
279. WELL Movement. February 2025.
280. ‎WELL Nourishment. February 2025.
281. WELL Sound. February 2025.
282. WELL Thermal Comfort. February 2025.
283. ‎WELL Water. February 2025.
284. Witnessing. March 2025
285. Witnessing authority. January 2024.
286. Written scheme. July 2022.

--BSRIA