Towards a water-wise world Annual report 2014

Determining the feasibility of the innovative ideas for the new building  

Helping Tergooi hospital realise its sustainability ambitions

8 October 2014Research

Within the short period of one year, research has been completed into the measures required to realise the high sustainability ambitions for the new Tergooi hospital in Hilversum. “KWR helped us immensely in tackling our questions on the basis of their expertise and extensive network,” says Programme Director Bert Jan Grevink. “We now have a thorough report that we can draw on in our decision-making.”

The new Tergooi hospital which, funding permitting, should be realised in 2019, wants to achieve the “excellent” BREEAM rating by attaining a high level of sustainability, including low energy consumption. On a commission from the hospital, KWR put together a consortium in TKI Water Technology to analyse 3 innovative ideas in the field of water – for their financial and technical feasibility, among others. The consortium, consisting of Tergooi hospital, Waternet, Utrecht Sustainability Institute, Ecofys, Deerns, Pharmafilter and KWR, researched the following innovative ideas:

  1. The introduction of the Pharmafilter® concept: the collection of all waste types in a single grinder in the nursing department. This waste stream is then treated in an own (pre)treatment process. The system produces lower discharges, for example of pharmaceutical residuals into the sewerage, and involves less handling by the staff and lower probability of infection.
  2. Sustainable cooling of the building through the use of the parking garage as a heat exchanger: surplus heat is provided thanks to the new building’s good isolation. The new, open parking tower can capture cold from the air through the use of heat exchangers in the ceilings, which transport the cold to the cold-heat storage system. In the summer, the building can then be cooled in a sustainable manner.
  3. A new concept for the production of hot tap water: decentralised, stand-alone electric heaters instead of a central boiler with circulation piping.

“Bringing together different specialties is required to solve these kinds of complex questions”

Bringing specialties together

“We initiated this study because we firmly believe in the feasibility of the innovations,” says Grevink. “And we see their added value in the fulfilment of our mission. Tergooi wants to be the most sustainable hospital in the Netherlands. Beyond financial sustainability, it’s a matter of looking at the overall picture. How reliable is the decentralisation of our patients’ hot-water supply, for instance? Or what are we getting into when we equip a public space, like a parking garage, with an installation that is part of our primary energy supply? KWR is capable of bringing together the specialties required to solve these kinds of complex questions.”

Testing economic feasibility

The Total Cost of Ownership (TCO) of the different innovation options was calculated to test their economic feasibility. This involved setting the investment and operational costs of an innovation against its benefits. “We indicated that we want to work with a break-even point of between 7 and 10 years,” says Grevink. “The final report provides a clear picture of the results for each of the different options. During the course of 2015 we will decide which options we will actually implement.”

The research at KWR was conducted by a team of experts of KWR, under the supervision of Jan Hofman. Beginning 1 March 2015, Jan Hofman will become professor of Water Science & Engineering at the University of Bath (UK), with the task of setting up the Water Innovation & Research Centre, in close cooperation with the English water companies.

© 2017 KWR Watercycle Research Institute

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