Anna-Maria Perttu
Anna-Maria Perttu

Anna-Maria Perttu

Swedish Polar Research Secretariat
External
B183 Luleå
amgtest.jpg
Gustafsson and her Thermal Response Test Equipment

The thermal response test method

Borehole heat exchangers are used to extract heat or cold from the ground. This technique has been used since the end of the seventies and is basically, in Sweden, a water filled borehole containing a single u-pipe. A heat carrier fluid is circulating inside the u-pipe, transporting the heat or cold from the borehole.

There are more than 200 000 thermal boreholes in Sweden, connected to detached houses and about a few hundreds of larger borehole systems. In these systems movements in the groundwater will influence the efficiency of the heat transfer. This projects aim is to investigate the influence on the heat transfer from groundwater movement in form of natural groundwater flow and from natural convection caused by the temperature variations in the groundwater filled borehole. This is investigated by using in-situ thermal response test and through model simulation.

Measurement equipment for thermal response test (TRT) was developed during the mid nineties by LTU, Sweden and OSU, USA. These test estimates the design parameters, effective ground conductivity and borehole thermal resistance, for borehole heat exchangers. Even though the method is in use in several countries and have been for several years there is still need of improvements and standardisation of measurements performance and analysis method. This projects aim is also to investigate how groundwater movements influence the result from TRT and how to perform the analysis of the test in order to get dynamic design parameters.

Publications

Conference paper

Advancing green infrastructure design (2016)

Field evaluation of grassed urban drainage swales
Rujner. H, Leonhardt. G, Perttu. A, Marsalek. J, Viklander. M
Part of: Novatech proceedings 2016, 2016
Article in journal

Laboratory study of infiltration into two frozen engineered (sandy) soils recommended for bioretention (2016)

Moghadas. S, Perttu. A, Viklander. P, Marsalek. J, Viklander. M
Hydrological Processes, Vol. 30, nr. 8, s. 1251-1264
Article in journal

Review of models and procedures for modelling urban snowmelt (2016)

Moghadas. S, Gustafsson. A, Muthanna. T, Marsalek. J, Viklander. M
Urban Water Journal, Vol. 13, nr. 4, s. 396-411
Conference paper

Modelling the effects of the joint occurrence of rainfall and snowmedlt in urban catchments (2015)

Leonhardt. G, Moghadas. S, Johansson. L, Gustafsson. A, Marsalek. J, Viklander. M
Part of: Urban Drainage Modelling 2015, Proceedings of the 10th International Conference of Urban Drainage Modelling, Mont-Sainte-Anne, Québec, Canada 20-23 Swptember 2015, s. 25-31, 2015
Conference paper

Modelling the effects of the joint occurrence of rainfall and snowmelt in urban catchments (2015)

Leonhardt. G, Moghadas. S, Gustafsson. A, Marsalek. J, Viklander. M
Paper presented at : NORDIWA 2015 : Nordic Wastewater Conference 04/11/2015 - 06/11/2015