Dimplex ground-source heat pumps provide heating and passive cooling

Published:  03 April, 2014

Dimplex, ground-source heat pump, GSHP, renewable energy
Groundwater and Dimplex heat pumps provide space heating for Vanguard House at Sci-Tech Daresbury, as well as passive cooling in the summer.

A Dimplex ground-source heat-pump system is providing low-carbon heating and passive cooling for a new building at SciTech Daresbury in Cheshire. Vanguard House, a 3600 m2 three-storey office and laboratory facility, was designed to achieve a BREEAM ‘Excellent’ rating and does not use any fossil fuels.

Designed and installed by Dimplex expert partner Ecovision Systems, the systems uses two heat pumps to provide 260 kW of heating capacity at a maximum temperature of 60°C. These heat pumps are reversible to provide passive cooling during the summer. In cooling mode, a flow temperature of 18°C is sufficient to cool the building, so no active chilling is necessary.

In addition, a 40 kW high-temperature heat pump provides all the domestic hot water, achieving a flow temperature of 70°C.

Vanguard House is above one of the largest natural aquifers in the UK, the Permo-Triassic sandstone. Groundwater is plentiful, so Ecovision developed an open-loop system drawing water from a depth of 65 m and passing it through a heat exchanger before re-injecting it into the ground at depths of up to 150 m — removing any risk of groundwater flooding into service channels and basements.

Because the system provides heating and cooling, the net change in groundwater temperature is limited.

The average temperature of water from the aquifer is 10 to 12°C, and the heat pumps can achieve a COP of 4.2. Heating and cooling is delivered to offices and laboratories by a concrete core activation system consisting of pipes embedded into the pre-cast concrete planks that form the floors.

Other design features of Vanguard House include part brise soleil, solar glazing and blinds to help manage temperature changes by reducing solar gain.

For more information on this story, click here: April 2014, 107

comments powered by Disqus

Search

Welcome

Welcome to Modern Building Services Online, the web edition of Modern Building Services (MBS) journal and the UK's most popular Building Services engineering site. Modern Building Services covers the entire Building Services Engineering industry. This site contains archived content from the journal, plus web-specific content.

When you go to our digital edition, you can also access the archive of digital editions.
August 2018: DIGITAL EDITION

ARCHIVE OF DIGITAL EDITIONS

Modern Building services has a group
on Linkedin - join us!

BESA conference 2018

Jobs

  • Building Energy Management Systems (BEMS) Engineer

      Consistently rated amongst the world's best universities, Imperial College London is a science-based institution with a reputation for excellence in teaching and research. Imperial has one of the largest and most diverse university estate portfolios in......

  • Engineering Technical Assistant

      Consistently rated amongst the world's best universities, Imperial College London is a science-based institution with a reputation for excellence in teaching and research. Imperial has one of the largest and most diverse university estate portfolios in......

  • Mechanical Engineer

      Coventry University is a dynamic, modern university with a proud tradition as a provider of high quality education and a focus on applied research. The University ranked 13th in the Guardian University Guide 2019 and was voted ‘Modern University of the......

more jobs »

Poll

"Is the Building Services industry lagging behind in the implementation of BIM?"



Calendar