A Novel Data Management Methodology and Case Study for Monitoring and Performance Analysis of Large-Scale Ground Source Heat Pump (GSHP) and Borehole Thermal Energy Storage (BTES) System

Todorov, Oleg; Alanne, Kari; Virtanen, Markku; Kosonen, Risto

doi:10.3390/en14061523

Cited by 13 publications

(15 citation statements)

References 17 publications

(29 reference statements)

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“…This research is based on the data gathered from Aalto New Campus Complex (ANCC) and its GSHP-GHE energy system, which has been introduced in detail in previous research [21] and analyzed in the present case study. Its 800 kW GSHP is connected to an irregular BTES field composed of 74 40mm-single-U groundwater-filled boreholes.…”

Section: Methodsmentioning

confidence: 99%

“…Data are taken on a daily basis: fluid temperatures from the DTS measurements and pumping flow rates taken from previous research [21] (assuming that total pumping is evenly distributed among the boreholes. The most relevant variables of borehole A19 are summarized in Tables 2 and 3.…”

Section: Borehole A19 Data Analysis and Effective Thermal Resistancementioning

confidence: 99%

“…However, there are temperature measurements of the BTES circuit (inlet/outlet temperatures) since around the middle of March 2018 as well as overall GSHP/circulation pumps (CP) activity. Following the methodology for data reconstruction proposed by Todorov et al [21], it is possible to establish the following correlations between the pumping volume flow rate V f (in l/s per borehole) and the frequency percentage signals (FP1/FP2) sent to each one of the twin CP (BTES field):…”

Section: Model Validation: Initial 39 Months Of System Operationmentioning

confidence: 99%

“…𝐶𝑜𝑚𝑏𝑖𝑛𝑒𝑑 𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝐹𝑎𝑐𝑡𝑜𝑟: 𝐶𝐹𝐹 = 𝐹𝑃1 100 + 𝐹𝑃2 100 𝐻𝑒𝑎𝑡 𝑒𝑥𝑡𝑟𝑎𝑐𝑡𝑖𝑜𝑛: 𝑉 = 0.4193𝑥𝐶𝐹𝐹/𝐻𝑒𝑎𝑡 𝑖𝑛𝑗𝑒𝑐𝑡𝑖𝑜𝑛: 𝑉 = 0.3519𝑥𝐶𝐹𝐹 (28) The BTES loads between October 2019 and May 2021 are obtained using the specifically developed data validation and reconciliation (DVR) methodology [21]. Prior to this, BTES loads are estimated based on the pumping flow rates (linear regression, Equation ( 24)) and measured inlet/outlet BTES temperatures.…”

Section: Model Validation: Initial 39 Months Of System Operationmentioning

confidence: 99%

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Different Approaches for Evaluation and Modeling of the Effective Thermal Resistance of Groundwater-Filled Boreholes

et al. 2021

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Groundwater-filled boreholes are a common solution in Scandinavian installations of ground source heat pumps (GSHP) due to the particular hydro-geological conditions with existing bedrock, and groundwater levels close to the surface. Different studies have highlighted the advantage of water-filled boreholes compared with their grouted counterparts since the natural convection of water within the borehole tends to decrease the effective thermal resistance Rb*. In this study, several methods are proposed for the evaluation and modeling of the effective thermal resistance of groundwater-filled boreholes. They are based on distributed temperature sensing (DTS) measurements of six representative boreholes within the irregular 74-single-U 300 m-deep borehole field of Aalto New Campus Complex (ANCC). These methods are compared with the recently developed correlations for groundwater-filled boreholes, which are implemented within the python-based simulation toolbox Pygfunction. The results from the enhanced Pygfunction simulation with daily update of Rb* show very good agreement with the measured mean fluid temperature of the first 39 months of system operation (March 2018–May 2021). It is observed that in real operation the effective thermal resistance Rb* can vary significantly, and therefore it is concluded that the update of Rb* is crucial for a reliable long-term simulation of groundwater-filled boreholes.

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Section: Methodsmentioning

confidence: 99%

Section: Borehole A19 Data Analysis and Effective Thermal Resistancementioning

confidence: 99%

Section: Model Validation: Initial 39 Months Of System Operationmentioning

confidence: 99%

Section: Model Validation: Initial 39 Months Of System Operationmentioning

confidence: 99%

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Different Approaches for Evaluation and Modeling of the Effective Thermal Resistance of Groundwater-Filled Boreholes

et al. 2021

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“…During the same period, numerous interesting research studies were published in world literature concerning both general principles involving the application of data validation and reconciliation [11,12,14,[26][27][28][29][30] as well as its application for solving more specific problems. For example, they were presented in the publications covering the problems of nuclear power plants [31][32][33], chemical industry [34][35][36][37][38][39][40], power plants and combined heat and power plants [41][42][43][44][45][46], refrigeration [47], and biotechnology [48].…”

Section: Introductionmentioning

confidence: 99%

Application of Data Validation and Reconciliation to Improve Measurement Results in the Determination Process of Emission Characteristics in Co-Combustion of Sewage Sludge with Coal

Kozioł

2021

Sustainability

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One of the actions popularized worldwide to reduce the consumption of fossil fuels is the combustion of renewable fuels and the co-combustion of both of these fuels. To properly implement combustion and co-combustion processes in power-generation installations, operational characteristics, including emission characteristics are required. To determine these characteristics, tests must be conducted, within the scope of which, for individual operating stages of the installation’s work, the readings collected from a relatively large number of control and measurement instruments should be taken into account. All these instruments have different levels of accuracy, which, among other factors, bring about lower adequacy of the characteristics determined on the basis of these measurements. The objective of this study is to present possible adaptations of data validation and reconciliation methods to increase the adequacy of emission characteristics for the process of co-combustion of fuels. The methodology is discussed based on the example of studies on the co-combustion process of sewage sludge with coal in a grate furnace. The aforementioned characteristics were determined based on measurement tests of gaseous emissions of flue gas components. The tests were carried out for various preset operational conditions of the process, such as the thickness of fuel layer on the grate, the share of sludge in the fuel, the humidity of the sludge, the theoretical ratio of excess air to combustion, and the distribution of air stream during the process. The research object is described and detailed research results concerning two exemplary measurement tests are given, as well as the most important results referring to the whole research. The performed calculations indicate the necessity to take into account often significant corrections, which can amount to about 10% of the measured value.

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Performance analysis of deep borehole heat exchangers for decarbonization of heating systems

Lund

2024

Deep Underground Science and Engineering

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Meeting the climate change mitigation targets will require a substantial shift from fossil to clean fuels in the heating sector. Heat pumps with deep borehole exchangers are a promising solution to reduce emissions. Here the thermal behavior of deep borehole exchangers (DBHEs) ranging from 1 to 2 km was analyzed for various heat flow profiles. A strong correlation between thermal energy extraction and power output from DBHEs was found, also influenced by the heating profile employed. Longer operating time over the year typically resulted in higher energy production, while shorter one yielded higher average thermal power output, highlighting the importance of the choice of heating strategy and system design for optimal performance of DBHEs. Short breaks in operation for regenerating the borehole, for example, with waste heat, proved to be favorable for the performance yielding an overall heat output close to the same as with continuous extraction of heat. The results demonstrate the usefulness of deep boreholes for dense urban areas with less available space. As the heat production from a single DBHE in Finnish conditions ranges from half up to even a few GWh a year, the technology is best suitable for larger heat loads.

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A Novel Data Management Methodology and Case Study for Monitoring and Performance Analysis of Large-Scale Ground Source Heat Pump (GSHP) and Borehole Thermal Energy Storage (BTES) System

Cited by 13 publications

References 17 publications

Different Approaches for Evaluation and Modeling of the Effective Thermal Resistance of Groundwater-Filled Boreholes

Different Approaches for Evaluation and Modeling of the Effective Thermal Resistance of Groundwater-Filled Boreholes

Application of Data Validation and Reconciliation to Improve Measurement Results in the Determination Process of Emission Characteristics in Co-Combustion of Sewage Sludge with Coal

Performance analysis of deep borehole heat exchangers for decarbonization of heating systems

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