酒店厨房余热回收型高效热水系统性能研究
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摘要
基于酒店厨房室内产生的大量废热未经利用而直接排至室外,同时需要供应生活热水的情况,提出了一种新型余热回收型热水系统。介绍了该系统的组成及运行机理。通过TRNSYS软件模拟了厨房全年的废热总量及室内温度,通过Matlab软件建立了各主要部件的数学模型。在保持水初温与终温不变的情况下,对不同室内温度、进水流量、热水用量工况下系统制热性能系数和余热利用系数进行了模拟分析和实验实测。结果表明:面积为60,150,250 m~2厨房的全年废热总量分别约为53.72,107.70,222.37 MJ,具有余热回收的必要性;室内温度在18～26℃范围内时,系统平均制热性能系数为3.47;当热水用量为600～900 L/d时,系统余热利用系数为0.61～0.77;随着进水流量的增大,余热利用系数逐渐增大,但增幅逐渐减小,进水流量取2.0～2.5 kg/s较为适宜。
Proposes an exhausted heat recovery hot water system based on the fact of a large amount of exhausted heat from hotel kitchens released without utilization and the domestic hot water demand at the same time. Presents the composition and operation mechanism of the system. Simulates the annual total amount of exhausted heat and indoor temperature of kitchens by TRNSYS software, and establishes the mathematical models of the main components by Matlab software. Under the condition of constant initial and final water temperature, simulates and measures the heating coefficient of performance(COP) and exhausted heat utilization coefficient(E) of the system under different operating conditions such as indoor temperature, influent water flow rate and hot water consumption. The results show that the annual exhausted heat amount of kitchens with the area of 60, 150, 250 m~2 are about 53.72, 107.70, 222.37 MJ, respectively, which is necessary for recovery. When the indoor temperature is in the range of 18 to 26 ℃, the average heating COP of the system is 3.47. When the hot water consumption is 600 to 900 L/d, the E of this system is 0.61 to 0.77. With the increase of influent water flow rate, the E increases gradually, while the growth rate decreases gradually. The influent water flow rate of 2.0 to 2.5 kg/s is preferred.
Proposes an exhausted heat recovery hot water system based on the fact of a large amount of exhausted heat from hotel kitchens released without utilization and the domestic hot water demand at the same time. Presents the composition and operation mechanism of the system. Simulates the annual total amount of exhausted heat and indoor temperature of kitchens by TRNSYS software, and establishes the mathematical models of the main components by Matlab software. Under the condition of constant initial and final water temperature, simulates and measures the heating coefficient of performance(COP) and exhausted heat utilization coefficient(E) of the system under different operating conditions such as indoor temperature, influent water flow rate and hot water consumption. The results show that the annual exhausted heat amount of kitchens with the area of 60, 150, 250 m~2 are about 53.72, 107.70, 222.37 MJ, respectively, which is necessary for recovery. When the indoor temperature is in the range of 18 to 26 ℃, the average heating COP of the system is 3.47. When the hot water consumption is 600 to 900 L/d, the E of this system is 0.61 to 0.77. With the increase of influent water flow rate, the E increases gradually, while the growth rate decreases gradually. The influent water flow rate of 2.0 to 2.5 kg/s is preferred.
引文
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[3] SERGIO E,LUIS M R,CRISTóBAL C.Efficiency improvement strategies for the feed water heaters network designing in super critical coal-fired power plants[J].Applied Thermal Engineering,2014,73(1):449- 460
[4] 段俊阳.燃煤锅炉烟气余热回收系统的性能分析[D].北京:华北电力大学,2016:10- 13
[5] BOE-HMAN B C,SAHA B B,ASHIWAG K.Experimental study on an innovative multifunction heat pipe type heat recovery two-stage sorption refrigeration system[J].Energy Conversion and Management,2008,49 (10):2505- 2512
[6] 刚宪秀.区域供热工业锅炉低温烟气余热深度回收技术的研究[D].哈尔滨:哈尔滨工业大学,2016:19- 24
[7] 刘忠兵,张泠,徐敏,等.厨房余热回收热电热泵储水式热水器的研究[J].太阳能学报,2011,32 (5):650- 654
[8] 中国建筑东北设计研究院有限公司,广厦建设集团有限公司.墙体材料应用技术统一规范:GB 50574—2010[S].北京:中国建筑工业出版社,2010:8- 10
[9] LEMMON E W,MCLINDEN M O,WAGNER W.Thermodynamic properties of propane.III.a reference equation of state for temperatures from the melting line to 650 K and pressures up to 1000 MPa[J].Journal of Chemical and Engineering Data,2009,54(12):3141- 3180
[10] VOGEL E,BICH E,LAESECKE A,et al.Reference correlation of the viscosity of propane[J].Journal of Physical and Chemical Reference Data,1998,27(5):947- 970
[11] MULERO A,CACHADI?A I,PARRA M I.Recommended correlations for the surface tension of common fluids[J].Journal of Physical and Chemical Reference Data,2012,41(4):1- 13
[12] MARSH K N,PERKINS R A,RAMIRES M L V.Measurement and correlation of the thermal conductivity of propane from 86 K to 600 K at pressures to 70 MPa[J].Journal of Chemical and Engineering Data,2002,47(4):932- 940
[13] 赵鹏程,丁国良,张春路,等.应用混合质的地源热泵系统仿真[J].太阳能学报,2004,25(3):383- 387
[14] SHAH M.A general correlation for heat transfer during film condensation inside pipes[J].International Journal of Heat and Mass Transfer,1979,22(4):547- 556
[15] 李妩,陶文铨.整体式翅片管换热器传热和阻力性能的试验研究[J].机械工程学报,1997,33(1):81- 88
[16] KANDLIKAR S G.A general correlation for saturated two-phase flow boiling heat transfer inside horizontal and vertical tube[J].Journal of Heat Transfer,1990,112(1):219- 228
[17] 马小魁,丁国良,张平,等.R410A 空调器空泡系数模型适用性的实验验证[J].上海交通大学学报,2007,41(3):388- 392