A modeling study on the reverse cycle defrosting of an air source heat pump with the melted frost downwards flowing away and local drainage

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28140%2F20%3A63525216" target="_blank" >RIV/70883521:28140/20:63525216 - isvavai.cz</a>
Result on the web
<a href="https://reader.elsevier.com/reader/sd/pii/S0378778820306605?token=4FDC40FB4D647F31E3AA897B21E06BAE179D2FF86C14AFB63356756EFE57A98AD50F7B663C55DC1C791BD3C2D2BD9977" target="_blank" >https://reader.elsevier.com/reader/sd/pii/S0378778820306605?token=4FDC40FB4D647F31E3AA897B21E06BAE179D2FF86C14AFB63356756EFE57A98AD50F7B663C55DC1C791BD3C2D2BD9977</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.enbuild.2020.110257" target="_blank" >10.1016/j.enbuild.2020.110257</a>

Result language
angličtina
Original language name
A modeling study on the reverse cycle defrosting of an air source heat pump with the melted frost downwards flowing away and local drainage
Original language description
Reverse cycle defrosting is widely used for air source heat pumps. When a multi-circuit heat exchanger is vertically installed in a heat pump as an outdoor coil, the melted frost could be kept downwards flowing or locally drained during defrosting by using water collecting trays. To analyze the performance differences of melted frost, two defrosting models were developed and previously reported by authors. In this study, the defrosting performance of an air source heat pump was numerically investigated based on the two models, with the melted frost downwards flowing away or local drainage considered. The following physical parameters are predicted and analyzed, including the thermal resistance of refrigerant, temperature of melted frost on tube and fin's surface, mass of melted frost and energy consumption from refrigerant during defrosting. As calculated, after the melted frost locally drained, the predicted total energy consumption could be decreased from 898.1 kJ to 727.5 kJ, and defrosting efficiency increased from 47.5% to 57.6%. This work is helpful to optimizing the intelligent control strategy of an air source heat pump unit, as well as saving energy for buildings
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20303 - Thermodynamics

Project
<a href="/en/project/ED2.1.00%2F19.0376" target="_blank" >ED2.1.00/19.0376: CEBIA - Tech Instrumentation</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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