Experimental investigation on heat and mass transfer in heating tower solution regeneration using packing tower

Huang, Shifang; Lv, Zhenyu; Zhang, Xiaosong; Liang, Caihua

doi:10.1016/j.enbuild.2017.12.064

Cited by 42 publications

(16 citation statements)

References 31 publications

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“…Vacuum boiling is another alternative regeneration method, in which water is separated from the solution by boiling and condensation. Many scholars carried out theoretical and experimental researches and results showed that this regeneration method has better energy saving [21][22][23][24][25][26][27][28][29][30][31][32][33] ratio and was widely used in the industrial applications. Concentrated heating efficiency.…”

Section: Research Paper Es Energy and Environmentmentioning

confidence: 99%

Experimental Research on a Novel Solution Regeneration System for Heat Source Tower Based on Vacuum Boiling and Condensation

Wen¹,

Cao²,

Yu³

et al. 2018

ES Energy Environ.

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Heat source tower heat pump (HSTHP) system is drawing more and more attention in Yangtze River Region, China, due to its energy saving characteristics. However, solution dilution occurs when it operates in the heating mode in winter. A high efficiency solution regeneration of heat source tower based on integration of vacuum boiling and condensation is proposed, and the relative experimental setup is built. The effects of inlet solution concentration, inlet solution temperature, system vacuum value and electric heater outlet valve open time on the performance of its regeneration efficiency and rate are studied. The results show that the regeneration efficiency of the novel system can achieve as high as 4.75 kg-1-1 kWh. Compared with the electric heating regeneration method (1.44 kg kWh), this regeneration system shows a great energy saving potential.

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Section: Research Paper Es Energy and Environmentmentioning

confidence: 99%

Experimental Research on a Novel Solution Regeneration System for Heat Source Tower Based on Vacuum Boiling and Condensation

Wen¹,

Cao²,

Yu³

et al. 2018

ES Energy Environ.

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“…Efficiency method is selected to illustrate the compressor model, shown in equations (1) and (2). According to the experiment data of the system, the isentropic efficiency of the roots compressor of the MVR solution regeneration system is 65%, and to simplify the model, the isentropic efficiency is set as constant.…”

Section: Compressor Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…To prevent the weak solution from being frozen and guarantee the normal operation of heat-source tower, weak solution regeneration is necessary for heat-source tower in heating season. [1][2][3] Some researchers have focused on the method of solution regeneration. Based on the existing research, the method of the solution regeneration could be mainly classified into the following four types.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of mechanical vapor recompression technology for solution regeneration in heat-source tower heat pumps

Wang

et al. 2018

Building Services Engineering Research and Technology

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Solution regeneration of the heat-source tower is significant to guarantee the normal operation of the heat-source tower. Mechanical vapor recompression system is an efficient system for evaporation of solution. In this paper, mechanical vapor recompression system is applied to regenerate solution of heat-source tower. To clarify the merits of mechanical vapor recompression solution regeneration system, several typical solution regeneration systems are modelled. As a result, mechanical vapor recompression shows 35.7%, 73.5% and 91.2% energy saving compared to air-driven heat pump, three-effect evaporating system, and single effect evaporating system, respectively. Furthermore, a heat-source tower heat pump with solution generation system is installed in a typical building in Yangtze river region. The whole heating season performance is simulated to find the effects of different solution regeneration system on the whole heat pump system. As a conclusion, the seasonal coefficient of performance of heat pump is decreased 1.6% by mechanical vapor recompression regeneration system. Comparatively, the seasonal coefficient of performance of heat pump is decreased 2.6%, 4.2% and 10.0% by air-driven heat pump, three-effect evaporating system, and single effect evaporating system, respectively. Practical application: Solution regeneration systems for heat-source tower heat pump systems have been applied in building projects especially in hot summer and cold winter zone in China based on previous investigation. A heat-source tower heat pump system combined with heat pump solution regeneration system has been applied in an office building in Changsha, Hunan Province in China. And its practical operation energy consumption has been reduced obviously compared with traditional single effect evaporation system. Therefore, it is of vital importance to demonstrate the operating performance of different solution regeneration systems applied in heat-source tower heat pump systems in building.

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“…Fujita et al [14] fitted the relationship between the mass transfer coefficient and gas-liquid flow through experiments. Huang et al [15,16] studied and built the correlation between the heat and mass transfer coefficient and spray density and air flow density, and established the physical model of heat-source tower heat pump (HTHP) system optimization. Wen et al [17,18] analyzed and optimized the heat and mass transfer characteristics, solution regeneration and liquid-gas ratio of the OHTHP.…”

Section: Introductionmentioning

confidence: 99%

Simulation Research on the Heating Performance of the Combined System of Solar Energy and Heat-Source Tower Heat Pump in a Hot Summer and Cold Winter Area

Shen

Yongga

2021

Energies

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Three connection methods for the combined heating systems of a closed-type heat-source tower heat pump (CHTHP) and solar collector (SC) were proposed in this paper: the heat-source tower (HST) and solar collector were connected in series (HST+SC), and the solar collector and heat pump (HP) condenser were connected in series (SC+HP) and in parallel (SC//HP). The calculation module of the closed heat-source tower was built using programming software based on C++ language, and three corresponding calculation models of the combined heating systems were established in the TRNSYS. Under the climatic conditions of the cold season in Changsha, the combined heating performance of the three systems was simulated and analyzed. The results indicate that the simulation results of the established models are in good agreement with the test results, and the simulation results can be used for the research of the system’s combined heating performance. When the outdoor air temperature and solar radiation intensity are low, the HST+SC system has the best heating performance; however, when the solar radiation intensity and ambient temperature are high, the heating performance of the SC//HP system is the best. When the solar radiation intensity and outdoor air temperature are between the previous two working conditions, the SC+HP system is the best performer for heating among the three systems. On the basis of the collector area and heat pump power designed in this study, the best operating condition interval diagrams of the three combined heating systems are established.

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Experimental investigation on heat and mass transfer in heating tower solution regeneration using packing tower

Cited by 42 publications

References 31 publications

Experimental Research on a Novel Solution Regeneration System for Heat Source Tower Based on Vacuum Boiling and Condensation

Experimental Research on a Novel Solution Regeneration System for Heat Source Tower Based on Vacuum Boiling and Condensation

Comparison of mechanical vapor recompression technology for solution regeneration in heat-source tower heat pumps

Simulation Research on the Heating Performance of the Combined System of Solar Energy and Heat-Source Tower Heat Pump in a Hot Summer and Cold Winter Area

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