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Palestra HVAC system upgrade

Entered by E.ON with Transport for London

The initial 2006 construction and fit-out of Transport for London鈥檚 (TfL鈥檚) Palestra office incorporated a number of energy-efficient initiatives and achieved a BREEAM 鈥渆xcellent鈥� rating, but when TfL took full occupancy in 2012 a study found that the design did not work as planned. Domestic hot water required a two-hour recharge, it was not possible to use waste heat from the CHP engine appropriately, and electrical demand on the CHP鈥檚 transformer was insufficient. So in 2015 TfL appointed E.ON to carry out works, including revising pipework design to use excess heat from low-temperature hot water on building systems; linking the energy management system to the BMS to ensure electrical demand is kept above its minimum output for as long as possible, maximising the CCHP run time; and installing a high-efficiency controllable chiller. 

The retrofit was completed without any downtime and resulted in a 拢566,000 12-month saving compared with the baseline prior to the E.ON works. The project also resulted in a 20% reduction in carbon dioxide emissions year-onyear. It thus exceeded the 2015 targets of 拢110,000 a year in cost savings and an 8% carbon dixode emissions reduction. The project achieved 拢1.59m capex payback in under three years, as well as greater occupant satisfaction with a secure hot water supply.

The Marq

Entered by Rolfe Judd

This new-build project for the Crown Estate, comprising 46,000ft² of offices as well as retail, restaurant and gallery space and situated near Piccadilly in London, is designed to achieve a Gold rating for WELL Shell and Core Certification 鈥� one of the first in the UK to do so 鈥� as well as BREEAM 鈥渙utstanding鈥� for the office space. Rolfe Judd met the WELL criteria through several factors, including the choice of natural colours and patterns, using materials low in volatile organic compounds, external window design that provides all building users with outdoor views, and private external south-facing terraces to help link the building to its surroundings. 

The office floor plan is designed to encourage an open layout and atmosphere, with high ceilings that bring more light and air through the building. The floor plates themselves are flexible, with the office space allowing for bolt-on WCs and showers. To hit its sustainability targets, the building鈥檚 roofs are landscaped with bio-diverse planting and bird and bat boxes. Clean rainwater is harvested, filtered and reused to supply all WCs throughout the building. The energy management system is fully automated and is integrated with plant operation and fuel, power and water meters. The building management team were involved in the design process as part of the soft landings approach aimed to ensure a smooth handover at completion.