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Performance Characterization of a Reversible Geothermal Heat Pump [Elektronisk resurs] Phase 2: Simulations and expansion valves investigations

Mazzotti, Willem, 1991- (författare)
Ground-Source Heat Pump (medarbetare)
KTH Skolan för industriell teknik och management (ITM) (utgivare)
Publicerad: Stockholm, 2014
Engelska 224
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  • 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. 

Ämnesord

Engineering and Technology  (hsv)
Mechanical Engineering  (hsv)
Energy Engineering  (hsv)
Teknik och teknologier  (hsv)
Maskinteknik  (hsv)
Energiteknik  (hsv)
Energiteknik  (kth)
Energy Technology  (kth)

Indexterm och SAB-rubrik

Ground-source heat pumps
performance mapping
lab tests
numerical simulations
floor heating
lumped capacitance
heat gains
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