Research Interests:
Research Interests:
Solvarmesystem och borrhalsvarmelager for bostadsomrade Anneberg, Danderyd : Systemval, projektering och byggande
Research Interests:
Research Interests:
Godkänd; 2004; 20070209 (ysko)</p
Research Interests:
Research Interests:
Godkänd; 2004; 20070209 (ysko
Research Interests:
Research Interests:
Research Interests:
Design of ground heat exchangers for heat pumps is increasingly done with the support of easy-to-use, fast computer programs. These programs vary widely in calculation approach and accuracy. This paper gives a short overview of the early... more
Design of ground heat exchangers for heat pumps is increasingly done with the support of easy-to-use, fast computer programs. These programs vary widely in calculation approach and accuracy. This paper gives a short overview of the early development, and focuses mainly on programs based on the g-function-method. This method is a suitable compromise between rules of thumb and tables on
Research Interests:
The Prototype Repository, at the Äspö HRL (Hard Rock Laboratory), is a demonstration project for the deposition of spent nuclear fuel, and provides a full-scale reference for testing predictive models relating to a spent nuclear fuel... more
The Prototype Repository, at the Äspö HRL (Hard Rock Laboratory), is a demonstration project for the deposition of spent nuclear fuel, and provides a full-scale reference for testing predictive models relating to a spent nuclear fuel repository, both its individual components as well as the complete system. The final layout involves six deposition holes, four in an inner section and
Research Interests: Engineering, Civil Engineering, Nuclear Engineering, Modeling, Numerical Simulation, and 15 moreThermal, Bentonite, Rock mass classification, Inverse Problem, Prediction Model, Thermal Conductivity, Temperature measurement, Finite Difference, Three Dimensional, Inverse Modelling, Thermal Properties, Temperature Sensor, Site Analysis, Spent Nuclear Fuel, and Prototype
Four two-variable parameter estimation models for evaluation of thermal response test data are compared when applied on the same temperature response data. Two models are based on line-source theor ...
Research Interests:
Research Interests:
Research Interests:
(1) Lervärmelagret; (2) Beräkningsmetod; (3) Känslighetsanalys; (4) Analytiska metode
Research Interests:
Research Interests:
Richard Stockton State College i New Jersey har varme for vintern och kyla for sommaren lagrat under parkeringsplatsen. Nar klimatanlaggningen skulle byggas om fick marken bli varmekalla. Har finns ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
(1) Värme- och kylasystem med och utan värmepump; (2) Geologiska och geotekniska förutsättningar i Sverige; (3) Markvärmeväxlare; (4) Installation horisontella markvärmeväxlare; (5) Installation spiralformad markvärmeväxlare – Slinky; (6)... more
(1) Värme- och kylasystem med och utan värmepump; (2) Geologiska och geotekniska förutsättningar i Sverige; (3) Markvärmeväxlare; (4) Installation horisontella markvärmeväxlare; (5) Installation spiralformad markvärmeväxlare – Slinky; (6) Installation vertikala markvärmeväxlare; (7) Markvärmeväxlares termiska prestanda; (8) Dimensionering; (9) Drift och underhåll; (10) Ekonomisk analys; (11) Markvärme och milj
Research Interests: Design, Soil, Bibliography, Geotechnical Engineering, Swedish, and 9 moreSweden, Maintenance, Rock, Costs, Heat, Storage, Geoteknik, Thermal Properties, and Environment
Research Interests:
Research Interests:
Research Interests:
(1) Demonstrationsobjekt - Forutsattningar och teknisk installation; (2) Demonstrationsobjekt - Uppfoljning och resultat under drift; (3) Demonstrationsobjekt - Utvardering och berakning av optimal ...
Research Interests:
Research Interests:
Research Interests:
A new version of DST, the duct ground heat storage model, is developed for TRNSYS, a modular programme for the simulation of partial or complete energy systems. It combines the easy utilisation of the previous version for TRNSYS with the... more
A new version of DST, the duct ground heat storage model, is developed for TRNSYS, a modular programme for the simulation of partial or complete energy systems. It combines the easy utilisation of the previous version for TRNSYS with the additional features of a more detailed version. The new improvements concern the local heat transfer along the flow path within the storage region. The modifications are based on detailed analyses of the thermal interaction between a solar collector field and a duct store. The DST model has been validated against measurements from several duct stores in operation. Detailed and time-consuming programmes were used to check the implementation of the new features. The present model is still reasonably fast and a large range of energy systems can be analysed for optimisation purposes.
Research Interests:
Research Interests:
Research Interests: Engineering and TRNSYS
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Ground source heat pump (GSHP) systems are commonly used in Sweden for both residential and commercial buildings. However, there are several key differences compared with GSHP systems utilized in the USA. Scandinavian systems are often... more
Ground source heat pump (GSHP) systems are commonly used in Sweden for both residential and commercial buildings. However, there are several key differences compared with GSHP systems utilized in the USA. Scandinavian systems are often heating-only, and instead of using grouted boreholes, groundwater-filled boreholes are often used. These boreholes are cased from the ground surface to the usually shallow bedrock. A single or double U-tube is commonly suspended in the borehole. These boreholes are often deeper than those commonly used in the USA. The average borehole depth has increased over time, and the average borehole depth for ground heat exchangers installed in 2013 in Sweden was 171 m (561 ft.) Boreholes as deep as 250-300 m (820-984 ft) are not uncommon and there is interest among installers of using even deeper boreholes. Incentives for deeper boreholes include limited area for drilling, pre-existing boreholes on neighboring properties, and deeper-than-usual layers of soil a...
Research Interests: Materials Science and Sma
Research Interests:
Research Interests:
Research Interests:
An important issue in the design of systems using borehole heat exchangers is to find costeffective methods to construct the borehole heat exchanger so that heat can be injected or extracted from t ...
Research Interests:
design To design borehole heat exchangers (BHE) for Ground Source Heat Pumps (GSHP) or Underground Thermal Energy Storage (UTES), the knowledge of underground thermal properties is paramount. In small plants (residential houses), these... more
design To design borehole heat exchangers (BHE) for Ground Source Heat Pumps (GSHP) or Underground Thermal Energy Storage (UTES), the knowledge of underground thermal properties is paramount. In small plants (residential houses), these parameters usually are estimated. However, for larger plants (commercial GSHP or UTES) the thermal conductivity should be measured on site. A useful tool to do so is a thermal response test, carried out on a BHE in a pilot borehole (later to be part of the borehole field). For a thermal response test, basically a defined heat load is put into the hole and the resulting temperature changes of the circulating fluid are measured. Since late 1990s, this technology became more and more popular, and today is used routinely in many countries for the design of larger plants with BHEs, allowing sizing of the boreholes based upon reliable underground data. The paper includes a short description of the basic concept and the theory behind the thermal response tes...
Research Interests:
Research Interests:
Analytical studies of the influence of regional groundwater flow on the performance of borehole heat exchangers
Research Interests:
Handbok i 3 delar (1. Allman del. 2. Varmelager. 3. Naturvarmekallor) som behandlar termiska analyser av markvarmesystem - energikalla eller energilager. Varmesystemet kan vara jord, berg eller grundvatten. Varmeforluster och andra... more
Handbok i 3 delar (1. Allman del. 2. Varmelager. 3. Naturvarmekallor) som behandlar termiska analyser av markvarmesystem - energikalla eller energilager. Varmesystemet kan vara jord, berg eller grundvatten. Varmeforluster och andra termiska prestanda, temperaturpaverkan pa omgivningen, lampliga roravstand, brunnskonfigurationer, aterladdning m m behandlas.
Research Interests:
Research Interests:
The combination of solar heat and ground-source heat pumps in dwellings gives opportunities for optimising the use of renewable energy sources and minimize the share of bought energy. Solar collectors in the system may give advantages for... more
The combination of solar heat and ground-source heat pumps in dwellings gives opportunities for optimising the use of renewable energy sources and minimize the share of bought energy. Solar collectors in the system may give advantages for the operational conditions both for the solar collectors and for the heat pump. The aim of this project was to analyse different variables such as energy demand, building types, climate, geological conditions, system design and control. The study has been carried out with TRNSYS simulations for Swedish climate and building conditions.