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A monthly based bore field sizing methodology with applications to optimum borehole spacing
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-5093-9070
École Polytechnique de Montréal, Quebec, Canada.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-3490-1777
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2016 (English)In: ASHRAE Transactions, ISSN 0001-2505, Vol. 122, no 1, 111-126 p., OR-16-009Article in journal (Refereed) Published
Abstract [en]

The required length of vertical ground heat exchangers(GHX) used in ground-coupled heat pump (GCHP) systems isdetermined so that the outlet temperature from the GHXremains within certain limits for the worst ground load condi-tions. These conditions may not necessarily occur after 10 or20 years of operation, as is usually assumed, but often occurduring the first year of operation.The primary objective of this paper is to develop a generalmethodology for the calculation of the total required bore fieldlength on a monthly basis during the first year of operationusing the framework of the ASHRAE bore field sizing method.Itisathreephaseprocess.Thefirstphaseconsistsofanalyzingandorderinggroundloadsaccordingtothefirstmonthofoper-ation.Next,afirstsetofrequiredlengthsisdeterminedbyusingthe analyzed ground load components and assuming atemperaturepenaltyTp=0.Then,aniterativeprocesstocalcu-latethetemperaturepenaltyattheendofeachmonthiscarriedout to obtain the final required length for the worst conditions.The methodology is exemplified in a particular case witha slight annual cooling thermal imbalance and with a highinfluence of the hourly peak in heating. For this particularcase, it is shown that the required bore field length occursduring the first year and that the starting month of operationhas a strong influence on the results.Finally,itisshownthatitispossibletoreducetheboreholespacing when the annual ground load is quasibalanced. In thecase studied here, the minimum length occurs for a borehole-to-borehole spacing of about 3.2 m (10.50 ft)

Place, publisher, year, edition, pages
ASHRAE , 2016. Vol. 122, no 1, 111-126 p., OR-16-009
Keyword [en]
borehole heat exchanger, sizing, borehole spacing
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-184184Scopus ID: 2-s2.0-84974846125OAI: oai:DiVA.org:kth-184184DiVA: diva2:915501
Note

QC 20160408

Available from: 2016-03-30 Created: 2016-03-30 Last updated: 2017-11-30Bibliographically approved

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A monthly based bore field sizing methodology with applications to optimum borehole spacing(2365 kB)134 downloads
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Monzó, Patrcia

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