Construction and performance research on double-tank heat pump water heating system

doi:10.11949/j.issn.0438-1157.20161494

Abstract

Abstract:

The mixing heating process of supplement water and original hot water in heat pump water heating system with single water storage tank results in the descend of water temperature in the tank,the high circulating heating temperature and the low efficiency of heat pump units.For this reason,the heat pump water heating system of double tanks(heating water-tank and heat storage tank) is introduced.The cold supplement water is heated to the setting temperature in the heating water-tank.Then it is sent to the heat storage tank by the recycling pump to supply users.It analyzes the system configuration and working principle of heat pump water system with double tanks.It is used in an air-source heat pumps heating water system of a university.The experimental study of this system results showed that the lower supplement water temperature and higher setting heating water temperature results in better energy saving effect compared with the heating pump system of single water tank.When the initial heating temperature and setting heating temperature is 14℃ and 55℃,the efficiency of double tanks system is increased by at least 19.31% than that of single tank system.

Key words: heat pump system, double tanks, hydrothermal, optimization, optimal design, COP

摘要：

储水型单水箱热泵热水系统在使用过程中存在自来水补水与水箱原有热水混合并由此导致水箱热水温度下降、热泵循环加热水温起点高，机组平均加热效率难以提高的问题。为此，提出了一种双水箱（加热水箱和储水水箱）热泵热水系统，冷水补水首先进入加热水箱，在其中被热泵机组加热到设定温度后，再送至储水水箱以供给用户侧，从而避免冷热水混合造成机组效率较低的问题。深入分析了双水箱热泵热水系统的系统构成和工作原理，并将其应用于某大学学生宿舍空气源热泵热水系统，同时对双水箱热泵热水系统开展性能实验研究。结果表明，与单水箱热泵热水系统相比，补水水温越低，目标加热水温越高，双水箱热泵热水系统节能效果越显著，当加热水箱初始加热水温与目标加热水温分别为14℃和55℃时，双水箱空气源热泵热水系统的效率比单水箱空气源热泵热水系统提高19.31%以上。

关键词: 热泵系统, 双水箱, 水热, 优化, 优化设计, COP

CLC Number:

LU Lin, LIANG Caihua, ZHANG Xiaosong. Construction and performance research on double-tank heat pump water heating system[J]. CIESC Journal, 2016, 67(S2): 333-339.

鹿琳, 梁彩华, 张小松. 双水箱热泵热水系统的构建及性能[J]. 化工学报, 2016, 67(S2): 333-339.

References 20

[1]	FERNÁNDEZ-SEARA J, PIÑEIRO C, DOPAZO J A, et al.Experimental analysis of a direct expansion solar assisted heat pump with integral storage tank for domestic water heating under zero solar radiation conditions[J].Energy Conversion & Management, 2012, 59(6): 1-8.
[2]	苗文凭,吴永明,张建成.空气源热泵热水器的可靠性研究[J].流体机械,2011, 39(12):74-79. MIAO W P, WU Y M, ZHANG J C.Study on reliability of air-source heat pump water heater[J].Fluid Machinery, 2011, 39(12): 74-79.
[3]	张洁,张良俊,王如竹,等.空气源热泵热水器系统优化计算及实验研究[J].太阳能学报,2007,(3): 286-290. ZHANG J, ZHANG L J, WANG R Z, et al.System optimization calculation and experimental research of air sourced heat pump water heater[J].Acta Energiae Solaris Sinica, 2007,(3): 286-290.
[4]	张太康,翁文兵,喻晶.R134a、R417a和R22用于空气源热泵热水器的性能研究[J].流体机械,2010, 38(5):72-76. ZHANG T K, WENG W B, YU J.Performance research of air-source heat pump water heater using R134a,R417a and R22[J].Fluid Machinery, 2010, 38(5): 72-76.
[5]	GUO J J, WU J Y, WANG R Z.A new approach to energy consumption prediction of domestic heat pump water heater based on grey system theory[J].Energy & Buildings, 2011, 43(6): 1273-1279.
[6]	BOURKE G, BANSAL P.Energy consumption modeling of air source electric heat pump water heaters[J].Applied Thermal Engineering, 2010, 30(13): 1769-1774.
[7]	LI X, WU W, ZHANG X, et al.Energy saving potential of low temperature hot water system based on air source absorption heat pump[J].Applied Thermal Engineering, 2012, 48(26): 317-324.
[8]	HEPBASLI A, KALINCI Y.A review of heat pump water heating systems[J].Renewable & Sustainable Energy Reviews, 2009, 13(6/7): 1211-1229.
[9]	FARDOUN F, IBRAHIM O, ZOUGHAIB A.Quasi-steady state modeling of an air source heat pump water heater[J].Energy Procedia, 2011, 6(6): 325-330.
[10]	王沣浩,王志华,郑煜鑫,等.低温环境下空气源热泵的研究现状及展望[J].制冷学报,2013, 34(5):47-54. WANG F H, WANG Z H, ZHENG Y X, et al.Research progress and prospect of air source heat pump in low temperature environment[J].Journal of Refrigeration, 2013, 34(5): 47-54.
[11]	GUO J J, WU J Y, WANG R Z, et al.Experimental research andoperation optimization of an air-source heat pump water heater[J].Applied Energy, 2011, 88(11): 4128-4138.
[12]	ZHANG J, WANG R Z, WU J Y.System optimization and experimental research on air source heat pump water heater[J].Applied Thermal Engineering, 2007, 27(5/6): 1029-1035.
[13]	李舒宏,单奎,张小松.储水式与即热式地源热泵热水器性能的实验研究[J].制冷学报,2008, 29(3):29-34. LI S H, SHAN K, ZHANG X S.Experiment study on performances of ground source heat pump storage and instantaneous water heater[J].Journal of Refrigeration, 2008, 29(3): 29-34.
[14]	裴刚,李桂强,季杰,等.空气源热泵热水系统即刻加热模式和循环加热模式的对比[J].化工学报,2009, 60(11):2694-2698. PEI G, LI G Q, JI J, et al.Comparative study on instantaneous heating and circulation heating modes of ASHPWH[J].CIESC Journal, 2009, 60(11): 2694-2698.
[15]	吕传超,李瑛,刘颖,等.热泵热水器蓄热水箱的数值模拟与结构优化[J].流体机械,2014,(4):76-80. LV C C, LI Y, LIU Y, et al.Numerical simulation and configuration optimization of a hot water storage tank of heat pump water heater[J].Fluid Machinery, 2014,(4): 76-80.
[16]	陈剑波,姚晶珊,韩星,等.不同环境温度下复叠式空气源热泵高温热水系统运行特性研究[J].暖通空调,2013, 43(7):107-111. CHEN J B, YAO J S, HAN X, et al.Study of cascade air-source heat pump of high temperature hot water unit under different environment temperature[J].Heating Ventilating & Air Conditioning, 2013, 43(7): 107-111.
[17]	张后雷,刘心志,陈士发,等.往复加热型双水箱空气源热泵热水器试验研究[J].流体机械,2010, 38(1):61-66. ZHANG H L, LIU X Z, CHEN S F, et al.Experimental investigation on air source heat pump water heater with two water tank based on reciprocating flow heating[J].Fluid Machinery, 2010, 38(1): 61-66.
[18]	陈士发.往复加热型双水箱热泵热水器理论分析与试验研究[D].南京:南京理工大学,2008. CHEN S F.Theoretical analysis and experimental investigation on dual-tank heat pump water heater based on reciprocating heating process[D].Nanjing: Nanjing University of Science and Technology, 2008.
[19]	孙玉阔.隔板往复运动型双水箱热泵热水系统的设计及实验研究[D].杭州:浙江大学,2013. SUN Y K.Design and experimental study of dual-tank heat pump water heater with reciprocating baffle[D].Hangzhou: Zhejiang University, 2013.
[20]	於慧姝,陆春林,金苏敏.热泵热水器蓄热水箱的漏热损失分析[J].流体机械,2010, 38(11):81-84. WU H S, LU C L, JIN S M.Analysis of heat loss on heat storage water tank applied to heat pump water heater[J].Fluid Machinery, 2010, 38(11): 81-84.