Dynamic Heating System of Multiphase Flow Digester by Solar-Untreated Sewage Source Heat Pump

The traditional biogas heating system has the disadvantages of a low energy efficiency ratio and high energy consumption. In this study, a solar-untreated sewage source heat pump system (SUSSHPS) was developed for heating a 12 m3 multiphase flow digester (MFD) in Suining, China. To investigate the o...

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Bibliographic Details
Published in:International journal of photoenergy 2020, Vol.2020 (2020), p.1-15
Main Authors: Yu, Nanyang, Ma, Rongjiang, Zhou, Jiri, Guo, Pei, Yuan, Yanping
Format: Article
Language:English
Subjects:
Alternative energy sources
Biogas
Computer simulation
Digesters
Energy consumption
Energy management
Experiments
Heat exchangers
Heat pumps
Heating
Heating systems
Multiphase flow
Sewage
Solar energy
Systems analysis
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Summary:The traditional biogas heating system has the disadvantages of a low energy efficiency ratio and high energy consumption. In this study, a solar-untreated sewage source heat pump system (SUSSHPS) was developed for heating a 12 m3 multiphase flow digester (MFD) in Suining, China. To investigate the operating effects, two modes were defined according to the solar fractions in different regions. On the basis of experimental data, thermodynamic calculations and operating simulation analysis were performed, and the solar collector area (Ac) and the minimum length of the sewage double-pipe heat exchanger (lmin) for the two modes were calculated. The results indicated that the Ac and lmin of mode 2 were larger than those of mode 1 at different solar fractions. Additionally, the results suggested that mode 1 can be used at a solar fraction of 0.5. Moreover, a comprehensive evaluation of different biogas heating systems was performed. Two evaluation methods were used for modeling calculations, and the results of the two methods were consistent. The SUSSHPS had the largest comprehensive evaluation value among the four systems. The proposed SUSSHPS can play a significant role in improving current biogas heating systems and promoting the development of biogas projects.
ISSN:1110-662X
1687-529X
DOI:10.1155/2020/8821687