Ingi Heimisson flytur fyrirlestur um verkefni sitt til meistaraprófs í vélaverkfræði. Verkefnið ber heitið Headloss in two phase flow of water and steam in geothermal gathering pipe systems.
Ágrip
The goal of this project is to measure pressure drop in gathering pipelines in a geothermal power plant and compare the measurements to predicted pressure drop according to known pressure drop models. The best suited model is found for the measurements. The eect of changing mass quality and roughness on the models is discussed. Most of the known models are emperical and only valid for the range they were made for. Orkuveita Reykjavíkur provided the physical data for the gathering pipes and Mannvit h.f. provided layout data. 6 gathering pipelines were measured at the upper region of Hellisheiði Power plant. Not all measurements nor the provided data were made at the same time which might not give the most accurate comparison of models with the measured data. The model with lowest combined average error and spread was Beattie model. 3 others models gave a lower average error but these models gave higher combined average error and spread. Since the known models were made in pipes that have much smaller diameter and less roughness a new model with diameter and roughness closer to the geothermal gathering pipes is preferred to be able to calculate the pressure drop accurately.
Leiðbeinendur: Halldór Pálsson, dósent við Iðnaðarverkfræði, vélaverkfræði og tölvunarfræðideild og Guðrún Sævarsdóttir, forseti Tækni og Verkfræðideildar Háskólans í Reykjavík
Prófdómari: Einar Jón Ásbjörnsson, lektor við Tækni og Verkfræðideildar Háskólans í Reykjavík