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Dimensioning and control for heat pump systems using a combination of vertical and horizontal ground-coupled heat exchangers
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik.
2015 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgaveAlternativ tittel
Dimensionering och styrning för värmepumpssystem som använder en kombination av vertikala och horisontella markvärmekollektorer (svensk)
Abstract [en]

A model has been developed which simulates a system consisting of a horizontal and vertical ground-coupled heat exchanger connected in parallel to the same heat pump. The model was used in computer simulations to investigate how the annual minimum and mean fluid temperatures at the heat pump varied as several parameters of the combined system were changed. A comparison was also made between different control settings for fluid flow rate distribution between the two exchangers. For the case when the flow rate distribution was not controlled, the effect of viscosity differences between a colder and warmer exchanger was investigated. The short term effects of letting the vertical heat source rest during the warm summer months was then tested. Lastly, the results of the model was compared to a simple 'rule of thumb' that have been used in the industry for this kind of combined system. The results show that using a combined system might not always result in increased performance, if the previously existing exchanger is a vertical ground-coupled heat exchanger. The effects of viscosity differences on the flow distribution seems to be negligible, especially for high net flows. Controlling the fluid flow rates seems to only be worth the effort if the the pipe lengths of the two combined exchangers differ heavily. Letting the vertical ground-coupled heat exchanger rest during summer was shown to in some cases yield an increased short-term performance in addition to the already known positive long term effects. The rule of thumb was shown to recommend smaller dimensions for combination systems than the more realistic analytical model.

sted, utgiver, år, opplag, sider
2015. , s. 69
Emneord [en]
heat pump system, ground-coupled, ground source, combination, dual, horizontal, vertical, borehole heat exchanger, BHE, complementary source, flow control
HSV kategori
Identifikatorer
URN: urn:nbn:se:kau:diva-36475OAI: oai:DiVA.org:kau-36475DiVA, id: diva2:822851
Eksternt samarbeid
Danfoss Värmepumpar AB
Fag / kurs
Physics
Utdanningsprogram
Engineering: Engineering Physics (300 ECTS credits)
Veileder
Examiner
Tilgjengelig fra: 2015-06-17 Laget: 2015-06-17 Sist oppdatert: 2015-06-17bibliografisk kontrollert

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