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Ochil View, Lumphinnans

Ochil View, Lumphinnans

Rehabilitated 1960s tenement block incorporating sunspaces, high levels of insulation and drying rooms.

Overview

This rehabilitated tenement block, built in the 1960s, is near public transport links and basic amenities and lies at the edge of a peripheral housing estate. The development was intended as a flagship project with a high quality aesthetic, which would then be rolled out across the estate in order to upgrade the whole area. 

 

Approach

Thermal energy in warm water from flooded mineworkings 170 metres underground is converted by heat pumps to a temperature of around 53˚C. This heated water is fed through radiators and hot water cylinders to provide heat and hot water to tenants. High‑levels of insulation mean that this low-temperature heating will keep the flats comfortably warm, even in winter.

The new drying rooms are lined in untreated softwood, insulated with a hygroscopic insulation (flax/jute mix) which allows the walls to take in and give off moisture vapour. The perforated metal screen is designed to allow a free flow of fresh air into the space and the passive stack ventilation system ensures that air is exhausted without the need for fans. The kitchens and bathrooms are also fitted with similar ventilation.

External balconies have been converted into sunspaces providing passive solar gain and add valuable space to the living area. The sunspaces are formed using a unique Danish glazing system which allows the glass panes to fold away, leaving an open balcony for summer use.

Materials have been selected to avoid formaldehydes, glues and preservative chemicals as far as possible.

C14.1_remodelled Balconies

Performance

NHER Rating

9.5-9.7

SAP Rating

87-93

Carbon emission

2.225 tonnes/per unit/ annum

U-values

0.23 Wm2C roof

0.25 Wm2C walls

floors as existing

Lessons

Private housing developments nearby have reduced the appeal of flatted accommodation subsequently and made future rehabilitation unlikely, despite the carbon savings that this particular approach offers.

There were initial teething problems with the mine water (geothermal) heating system it is necessary to be aware of the need to set aside time to deal with such issues if using innovative systems in order to minimise the risk of negative feedback. 

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