Project

The influence of velocity caps on seawater

Publisher

Supervisor

Location

Greater Copenhagen area

Seawater has been used in many different cases as heat source to supply large-scale heat pumps. The seawater intake is often far below surface to ensure a constant and high water temperature during winter when the heat demand is the highest. This improves the performance of heat pumps.

The focus area for this project is Kongedybet, a trench in Øresund near Nordhavn. Nordhavn will gradually be converted from a rural harbour area to a demonstration of a sustainable city district of the future, featuring environmental responsibility. It is expected that Nordhavn will have 40,000 inhabitants and 40,000 jobs distributed over a floor area of 3.5 million m2 by 2060.

For this purpose, seawater shall be analysed and its potential use as heat source for a heat pump be assessed. The depth of the sea in this region is only about 11 m and it is desired to take in seawater at highest possible temperature and heat capacity. Data of monthly temperature, North-South current and salinity for every 1 m layer and a distribution (%) of each parameter value within the months is available from a report of the Danish Meteorological Institute (DMI).

The aim of this project is to analyse the influence of a seawater intake (velocity cap) at the seabed near Nordhavn to the surrounding water and the conclusions that can be made from that. The following shall be investigated on monthly basis in order to create an annual profile:

- Optimal position of velocity gap to achieve highest temperature and heat capacity

- The proportion of each layer to the seawater taken in and the resulting intake temperature

- The influence diameter/distance from the intake to the surrounding water as a function of e.g. volume flow rate or heat capacity

- The available heat capacity or maximum possible volume flow rate to take seawater in

- The impact of current to the amount of seawater taken in under given conditions

- Influence of velocity gap geometry on pressure drops or influence diameter/distance

CFD-analyses shall be used for modelling. The basis may be a model developed in the open source library OpenFOAM.

In collaboration with

HOFOR A/S

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Contact

Company / Organization

DTU Mekanik

Name

Erik Damgaard Christensen

Position

Sektionsleder, Professor

Mail

edch@mek.dtu.dk

Supervisor info

MSc in Design & Innovation

Supervisor

Erik Damgaard Christensen

Co-supervisors

Wiebke Brix Markussen, Henrik Pieper

ECTS credits

30 - 35

Type

MSc thesis

Must be completed

41319 Computational Fluid Dynamics

MSc in Sustainable Energy

Supervisor

Erik Damgaard Christensen

Co-supervisors

Wiebke Brix Markussen, Henrik Pieper

ECTS credits

30 - 35

Type

MSc thesis

Must be completed

41319 Computational Fluid Dynamics

MSc in Engineering, Mechanical Engineering

Supervisor

Erik Damgaard Christensen

Co-supervisors

Wiebke Brix Markussen, Henrik Pieper

ECTS credits

30 - 35

Type

MSc thesis

Must be completed

41319 Computational Fluid Dynamics

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.


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