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Design and Construction of a Small Ammonia Heat Pump
KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.
2010 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

In view of the fact that most of the synthetic refrigerants, in case of leakage or release, are harmful to the environment by contributing in global warming or depleting stratospheric ozone layer, many research works have been done recently to find alternative refrigerants posing no or negligible threat to the environment. Among alternative refrigerants, ammonia, a natural refrigerant with zero Global Warming Potential (GWP) and Ozone Depletion Potential (ODP), can be a sensible choice.Although ammonia has been used for many years in large industrial systems, its application in small units is rare. In this project a small heat pump with about 7 kW heating capacity at -5 °C and +40 °C evaporation and condensation temperatures is designed and built to work with ammonia as refrigerant. The heat pump is expected to produce enough heat to keep a single-family house warm in Sweden and to provide tap hot water for the house. After successful completion of this project, it is planned to install the heat pump in a house to test it throughout a heating season to study its performance in real working conditions.Since ammonia is flammable and toxic in high concentrations, the refrigerant charge is tried to be kept low in the heat pump to reduce the risk of fire or poisoning in case of unwanted release of refrigerant to the surroundings. The compact design of the heat pump helps reducing the refrigerant charge. Besides, considering the limited space normally reserved for installation of a heat pump in a house, the compact design of the heat pump is necessary.

Ort, förlag, år, upplaga, sidor
2010. , s. 46
Nyckelord [en]
ammonia, heat pump, minichannel, heat exchanger, refrigerant charge, COP, tap water heating, space heating, domestic hot water, variable speed, compressor
Nationell ämneskategori
Energiteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-64411OAI: oai:DiVA.org:kth-64411DiVA, id: diva2:483090
Utbildningsprogram
Teknologie masterexamen - Hållbar energiteknik
Presentation
, Brinellvägen 68, Stockholm (Engelska)
Uppsök
teknik
Handledare
Examinatorer
Tillgänglig från: 2012-01-27 Skapad: 2012-01-24 Senast uppdaterad: 2012-01-27Bibliografiskt granskad

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B A Monfared 2010_Design and Construction of a Small Ammonia Heat Pump_MSc Thesis(14625 kB)15370 nedladdningar
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Typ fulltextMimetyp application/pdf

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