As older systems come to the end of their life, they are progressively being replaced with alternatives that use lower GWP refrigerants. Martin Passingham, product manager for DX at Daikin UK, looks at what this means for the design of existing systems
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Materials for potable water
Careful specification of the materials for drinking water applications will ensure the quality of the supply within a building is maintained. Here, Scott James, Director at Viega discusses the factors that engineers and installers need to consider
Recovery, recycling and reuse
Significantly reducing the demand for imported higher-GWP refrigerants before the next quota reduction in 2021 will be key to avoiding many supply and price issues experienced since late 2017, says Daikin’s Martin Passingham
Taking stock
As CIBSE Journal enters its 11th year, an unprecedented level of activity in legislation and policy is affecting building services engineers in the UK and worldwide. Hywel Davies looks at what is happening
Key changes in the updated Heat Networks Code of Practice
A major update to the Heat Networks Code of Practice includes key performance outputs that allow clients to check their networks are performing as designed. Here, the authors highlight the major revisions
Heat spring’s eternal: The Bath Abbey heating plan inspired by Romans
An ambitious project is under way to replace Bath Abbey’s 150-year-old heating system with low-energy underfloor heating, using heat recovered from hot springs rising in the nearby Roman Baths. BuroHappold Engineering’s Neil Francis describes the challenges encountered at the Unesco World Heritage city site
Ten classic problems with occupant survey research
Findings from occupant surveys may not be as robust as researchers claim. Roderic Bunn highlights potential flaws in health, comfort and productivity studies
Without bias: How to design the perfect occupant survey
So you want to conduct an occupant survey in a non-domestic building? It requires more thought and skill than you might think, and good design may prevent you jumping to the wrong conclusions, says Roderic Bunn
Video: Regulation and smoke control – what must change after the Grenfell fire?
The key fire safety issues flagged by Dame Judith Hackitt after Grenfell were tackled by smoke control experts at a CIBSE Journal roundtable sponsored by Colt. Watch panellists discuss outcomes from the debate.
Fresh thinking: Importance of indoor air quality metrics
Indoor air quality is not easy to measure, but metrics must move towards environments that consider occupant health, says the University of Nottingham’s Benjamin Jones in his round-up of discussions at an Air Infiltration and Ventilation Centre workshop on IAQ