Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 106, Issue -, Pages 506-516Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2019.05.022
Keywords
Transcritical CO2 heat pump; Internal heat exchanger; Length; Water temperature; Ambient temperature
Categories
Funding
- National Natural Science Foundation of China [5157G152]
- Fundamental Research Funds for the Central Universities
Ask authors/readers for more resources
Many studies have investigated the effect of internal heat exchanger (IHX) on the transcritical CO2 heat pump (TCHP) system. However, little information is available regarding the length of IHX under various water temperature conditions. In this paper, the theoretical model was established to compare the heating performance with and without IHX. A prototype TCHP test-rig was conducted to validate the model, and the experimental results showed a good agreement. The results show that the effect of IHX on the coefficient of performance (COP) is related with inlet water temperature. The IHX is beneficial for the COP with higher temperature 40 degrees C. Meanwhile, the optimal discharge pressure is reduced by more than 1 MPa with the IHX length increasing from 0 m to 4 m. Although the longer length is profitable, the discharge temperature will tend to rise 25 degrees C and easily exceed 145 degrees C when the ambient temperature depresses to 2 degrees C. Therefore, the length in this paper is recommended to be approximately 2.5 m considering the conflict between the discharge pressure and discharge temperature. (C) 2019 Elsevier Ltd and IIR. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available