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Performance Characterization of a Reversible Geothermal Heat Pump: Phase 2: Simulations and expansion valves investigations
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. (Ground-Source Heat Pump)ORCID iD: 0000-0002-9120-8637
2014 (English)Report (Other academic)
Abstract [en]

Geothermal heat pumps connected to borehole heat exchanger(s) (BHE) have a large share in the heat pump and global heating/cooling market in Sweden and some other countries. The company Scandinavian Energy Efficient Company (SEEC) has patented a reversible geothermal heat pump supposed to provide heating and cooling, as well as domestic hot water (DHW) for household applications. A borehole is used as heat source (resp. heat sink) when the heat pump works as heating device (resp. cooling device).The use of such a product may be relevant in climates where both heating and cooling are needed. The results presented in this report correspond the second phase of a project called Performance Characterization of Reversible Geothermal Heat Pump. The first phase of the project focused on COP measurements while the second phase is dedicated to simulations and investigations on the expansion valves.

A COMSOL model, including conduction and convection mechanisms, was developed to simulate the heat transport during short-time operations in one borehole with a U-pipe borehole heat exchanger. The loads are determined from a MATLAB model which includes all the elements that compose a house side system, i.e. the heat pump, the buffer tank, the Domestic Hot Water (DHW) tank, the heating system within the house and the house itself. The house and borehole models are made so that it is possible to investigate the influence onthe performance of a large number of parameters such as the tanks volume, the flow rates, the house characteristics, the heating and cooling emitters, the control parameters. The experimental tests are conducted according to the procedure explained in the report of the first phase of this project. The static setting, which is the internal spring tension, of the thermostatic expansion valve ischanged manually. Then, performance tests are conducted and compared to the previousresults. The electronic expansion valve tests are conducted for two different superheat settings.

Place, publisher, year, edition, pages
Stockholm, 2014. , p. 224
Keyword [en]
Ground-source heat pumps, performance mapping, lab tests, numerical simulations, floor heating, lumped capacitance, heat gains
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-215729OAI: oai:DiVA.org:kth-215729DiVA, id: diva2:1149232
Note

QC 20171213

Available from: 2017-10-13 Created: 2017-10-13 Last updated: 2017-12-13Bibliographically approved

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PERFORMANCE CHARACTERIZATION OF A REVERSIBLE GEOTHERMAL HEAT PUMP - Phase 2(27839 kB)12 downloads
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