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Utveckling av beräkningsmodell för värmepumpstillsats i avfuktarsystem
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2018 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

One way to make a dehumidifier system more energy efficient is to attach a heat pump onto the dehumidifier. In this master thesis, a MATLAB-based computational model is developed to simulate the heat pump application. The aim for this model is to optimize various configurations of the heat pump, and to be used as a tool in theproduct development process. The computational model should also verify the measurements that have been made on the prototype for the heat pump application. The heat pump application is mathematically described by a set of equations. Together with a set of unknown model parameters, this creates an equation system. Theequation system is then solved numerically with Newton's method in multiple variables. The validation of the calculation model shows relatively small model errors between simulated and measured data. The exception is the model error of the condensing temperature of the refrigerant, where the model error is more than twice as big as the error in other simulated temperatures. This may be due to extrapolating of curve fitted data in order to calculate the total efficiency of the compressor. Another method to calculate the total efficiency of the compressor should therefore be considered in order to reduce the model error of the condensing temperature of the refrigerant. Simulations of the model also show that choosing the refrigerant R134a over R1234yf increases the heat pump coefficient of performance (COP) by an average of 12 %. The results have also shown that heat exchangers with 3 tube rows instead of 2 gives the heat pump an increased COP. This result could be utilized tocompensate for the reduced COP when R1234yf is the refrigerant of choice.

Place, publisher, year, edition, pages
2018. , p. 60
Series
UPTEC ES, ISSN 1650-8300 ; 18 031
Keywords [sv]
Värmepump, Energieffektivisering, Avfuktare, Beräkningsmodell
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:uu:diva-355156OAI: oai:DiVA.org:uu-355156DiVA, id: diva2:1225392
External cooperation
Munters
Educational program
Master Programme in Energy Systems Engineering
Supervisors
Examiners
Available from: 2018-06-27 Created: 2018-06-26 Last updated: 2018-06-27Bibliographically approved

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  • apa
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Output format
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