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13 results on '"Mogensen, Palne"'

5. A study of the thermal response of a borehole field in winter and summer

Author

Monzó, Patrcia, Acuna, Jose, Mogensen, Palne, and Palm, Björn

Subjects
ground source heat pump, borehole heat exchanger, g-function, numerical model, long term performance
Abstract

A Ground Source Heat Pump system is a well-known technology used to provide space heating and cooling in residential and commercial buildings. For large energy demands, a number of boreholes, which can vary between tens and hundreds, may be required. The boreholes can be arranged in linear, square, rectangular, or any other configuration not necessarily symmetric. The heat exchangers in the boreholes are typically connected in parallel. Recently, the idea of a more flexible configuration of multiple Borehole Heat Exchangers (BHEs) has been introduced in commercial applications, enabling the system to operate in a more versatile manner, dividing the ground into different thermal zones. In this new arrangement, the BHEs are connected into thermal sub-groups allowing them to operate separately as sub-systems, depending on the building energy needs and the seasonal periods. In this project, the temperature response of a multiple BHE configuration is obtained from simulations in a numerical model using FEM software, Comsol Multiphysics© under different operational conditions. First, the loads are imposed under the usual conditions so that all boreholes are operated to provide heating in winter and cooling in summer. The results of this study show that our numerical model presents a good agreement with the ones generated from EED when the system is balanced. Moreover, some hypothetical scenarios with respect to the BHEs arrangement and the operational mode are performed thanks to the flexibility of our numerical model. The hypothetical scenarios provide a first approach about the thermal behavior of the boreholes and their interactions within the field with respect to its wall temperature, previous operation and thermal storage. Further work will be devoted to study more realistic scenarios. QC 20131022

Published
2013

6. Bergvärme på djupet : Boken för dig som vill veta mer om bergvärmepumpar

Author

Björk, Erik, Acuña, José, Granryd, Eric, Mogensen, Palne, Nowacki, Jan-Erik, Palm, Björn, and Weber, Kenneth

Subjects
bergvärmepump, Energiteknik, bergvärme, värmepumpsteknik, Energy Engineering, geoenergi, värmepump
Abstract

I den här boken får du lära dig mer om bergvärmepumpar. Hur fungerar en värmepump? Hur gör man en lönsamhetskalkyl? Hur upphandlar man? Kan man trimma sitt system? Dessutom: lär dig mer om radiatorsystemet, berget och kollektorn. QC 20130503

Published
2013

13. A Monthly Based Bore Field Sizing Methodology with Applications to Optimum Borehole Spacing.

Author

Monzó, Patricia, Bernier, Michel, Acuña, José, and Mogensen, Palne

Subjects
*GROUND source heat pump systems, *BOREHOLES, *TEMPERATURE effect, *COOLING, *HEATING
Abstract

The required length of vertical ground heat exchangers (GHX) used in ground-coupled heat pump (GCHP) systems is determined so that the outlet temperature from the GHX remains within certain limits for the worst ground load conditions. These conditions may not necessarily occur after 10 or 20 years of operation, as is usually assumed, but often occur during the first year of operation. The primary objective of this paper is to develop a general methodology for the calculation of the total required bore field length on a monthly basis during the first year of operation using the framework of the ASHRAE bore field sizing method. It is a three phase process. The first phase consists of analyzing andorderinggroundloads according to the firstmonthof operation. Next, afirst set of required lengths is determined by using the analyzed ground load components and assuming a temperature penaltyTp=0. Then, aniterative process to calculate the temperature penalty at the end of each month is carried out to obtain the final required length for the worst conditions. The methodology is exemplified in a particular case with a slight annual cooling thermal imbalance and with a high influence of the hourly peak in heating. For this particular case, it is shown that the required bore field length occurs during the first year and that the starting month of operation has a strong influence on the results. Finally, it isshownthat it is possible toreduce the borehole spacing when the annual ground load is quasibalanced. In the case studied here, the minimum length occurs for a boreholeto- borehole spacing of about 3.2 m (10.50 ft). [ABSTRACT FROM AUTHOR]

Published
2016

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