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Design and control strategy of an innovative CO2 residential monoblock heat pump for domestic hot water.
Number: 0635
Author(s) : FIABANE C., PADOAN L., VIRGILIO F., SIMONI F., BUTI M., PIOVESAN S., SOYLEMEZ E., HAZARIKA M. M., HAFNER A.
Summary
Carbon dioxide (CO2) as a natural refrigerant (R744) proves its potentiality and suitability for residential heat pumps (HP) producing domestic hot water (DHW). Despite the comparable performances of a CO2 HP to units adopting other natural and/or synthetic refrigerants, the components cost represents the main barrier to CO2‘s wider market share, mainly for higher working pressure and low mass production ratios. This work presents the thermodynamical and control strategy design of a monoblock HP for DHW with CO2. The product’s uniqueness is being the first with a heating capacity lower than 4 kW on the residential heating market. In particular, the study will focus on the thermodynamic transcritical cycle, component dimensioning and control logic development. The design took into consideration different technologies and solutions for both gas cooler and water storage tank, improving the heat transfer, coefficient of performance, heating-up time and stratification inside the water tank. On the control side, CO2 involves new algorithms regulating two different expansion valves aimed to adjust: high-side pressure level, superheating the compressor inlet condition and oil return at the same time.
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Details
- Original title: Design and control strategy of an innovative CO2 residential monoblock heat pump for domestic hot water.
- Record ID : 30033320
- Languages: English
- Source: 11th IIR Conference on Compressors and Refrigerants.
- Publication date: 2024/09
- DOI: http://dx.doi.org/10.18462/iir.compr.2024.0635
Links
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Indexing
- Themes: Heat pumps techniques
- Keywords: CO2; R744; Heat pump; Natural refrigerant; Residential sector; Hot water; Heat transfer; COP; Expansion valve; Modelling
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- Date : 2011/08/21
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- Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
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- Languages : French
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- Date : 2021/09/16
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- Source: 9th IIR Conference on Ammonia and CO2 Refrigeration Technologies. Proceedings: Ohrid, North Macedonia, 16-17 September, 2021
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