Design and analysis of a novel dual source vapor injection heat pump using exhaust and ambient air

•A novel dual source vapor injection heat pump is designed and analyzed.•It is first attempt to recover ventilation heat by a vapor injection compressor.•A waste heat recovery rate of more than 100% is achievable.•It has a COP of 23.2% higher than a conventional air source heat pump.•The largest exe...

Full description

Saved in:
Bibliographic Details
Published in:Energy and built environment 2022-01, Vol.3 (1), p.95-104
Main Authors: Li, Jing, Fan, Yi, Zhao, Xudong, Bai, Xiaoman, Zhou, Jinzhi, Badiei, Ali, Myers, Steve, Ma, Xiaoli
Format: Article
Language:English
Subjects:
COP
Defrosting
Dual source vapor injection heat pump
Exhaust air
Waste heat recovery
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•A novel dual source vapor injection heat pump is designed and analyzed.•It is first attempt to recover ventilation heat by a vapor injection compressor.•A waste heat recovery rate of more than 100% is achievable.•It has a COP of 23.2% higher than a conventional air source heat pump.•The largest exergy destruction takes place in the compressor. A novel dual source vapor injection heat pump (DSVIHP) using exhaust and ambient air is proposed. The air exhausted from the building first releases energy to the medium-pressure evaporator and is then mixed with the ambient air to heat the low-pressure evaporator. A vapor injection (VI) compressor of two inlets is connected with the low and medium pressure evaporators. It's first time that a VI compressor is employed to recover the ventilation heat. The system can minimize the ventilation heat loss and provide a unique defrosting approach by using the exhaust waste heat. Fundamentals of the proposed DSVIHP are illustrated. Mathematical models are built. Both energetic and exergetic analyses are carried out under variable conditions. The results indicate that the DSVIHP has superior thermodynamic performance. The superiority is more appreciable at a lower ambient temperature. It has a higher COP than the conventional vapor injection heat pump and air source heat pump by 11.3% and 23.2% respectively at an ambient temperature of -10 °C and condensation temperature of 45 °C. The waste heat recovery ratio from the exhaust air is more than 100%. The novel DSVIHP has great potential in the cold climate area application.
ISSN:2666-1233
2666-1233
DOI:10.1016/j.enbenv.2020.11.004