“…Simulation and experiment data are shown in Figures 3 and 4. 24 It is concluded from the figures that the error between simulation data and experiment data is within 5%, which could guarantee the accuracy of model. Figure 3.Experiment value and simulation value of discharge pressure.Figure 4.Experiment value and simulation value of quantity of heat transfer.…”
Section: Model Of Solution Regeneration Systemsmentioning
confidence: 82%
“…Simulation and experiment data are shown in Figures 3 and 4. 24 It is concluded from the figures that the error between simulation data and experiment data is within 5%, which could guarantee the accuracy of model.…”
Section: Kf Mvrmentioning
confidence: 82%
“…During the heating season, the solution extracts heat from the air. According to the principle of energy and mass conservation, Outlet parameters including the outlet humidity ratio and temperature of air, inlet and outlet temperature of solution could be solved by discretizating equations (24) to (28).…”
Section: Model Of Heat-source Tower Heat Pumpmentioning
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.
“…Simulation and experiment data are shown in Figures 3 and 4. 24 It is concluded from the figures that the error between simulation data and experiment data is within 5%, which could guarantee the accuracy of model. Figure 3.Experiment value and simulation value of discharge pressure.Figure 4.Experiment value and simulation value of quantity of heat transfer.…”
Section: Model Of Solution Regeneration Systemsmentioning
confidence: 82%
“…Simulation and experiment data are shown in Figures 3 and 4. 24 It is concluded from the figures that the error between simulation data and experiment data is within 5%, which could guarantee the accuracy of model.…”
Section: Kf Mvrmentioning
confidence: 82%
“…During the heating season, the solution extracts heat from the air. According to the principle of energy and mass conservation, Outlet parameters including the outlet humidity ratio and temperature of air, inlet and outlet temperature of solution could be solved by discretizating equations (24) to (28).…”
Section: Model Of Heat-source Tower Heat Pumpmentioning
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.
“…The mathematical models of the MVR subsystem have been validated by the experimental data obtained from the literature [28]. Because the compressor is the core component of MVR system, here we mainly focus on the verification of compressor.…”
This paper presents a new vacuum membrane distillation (VMD) coupled with mechanical vapor recompression system for the concentration of sulfuric acid solution; the mathematical models based on the mass and energy balances in each part of the system are established. The influences of the corresponding operating parameters including feed concentration, feed temperature, feed velocity and permeate-side absolute pressure on membrane flux are investigated and discussed. The membrane flux increases with the increase in feed temperature and velocity, but it decreases with the increase in feed concentration and permeate-side absolute pressure. Furthermore, the energy consumption of the proposed system is explored through analyzing the influences from key factors, including boiling point elevation, temperature and concentration polarization and heat transfer temperature difference of heat exchanger on power consumption of compressor. Compared with the conventional VMD system and multi-effect MD system, the proposed system can save 77.6% and 20.4% energy due to a significant improvement in thermal efficiency by recovering the latent heat of vaporization. Eventually, an economic evaluation of the proposed system is performed comprehensively and the most optimized compression ratio of compressor can be obtained, which can guarantee the lowest energy consumption and total annual cost. Therefore, these results can provide significant references for the implementation and further optimization of the proposed system in the future.
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