摘要
针对寒区路基冻胀问题,提出一种路基专用地源热泵型供热装置,构建能够主动控制热量收支和温度变化的"热能转化式"路基。为明确热泵冷凝器型式和运行模式对换热温度的影响,设计两种冷凝器盘管方案,并进行4种不同启停比的试验测试。结果表明:在连续运行模式下,冷凝器铜管螺旋间距为20 cm时,最高冷凝温度可达45℃,平均供热温度为40℃。蒸发温度可达-10℃以下,并随着冷凝温度的提高而降低。当螺旋间距为5 cm时,平均供热温度为70℃,蒸发温度随着冷凝温度的提高呈先降低、后升高的规律,冷凝器周围容易出现热堆积现象。随着启停比的减小,供热温度逐渐降低,但制热系数逐渐升高。在设计阶段应合理选择换热器盘管间距,在运行阶段合理控制启停比,从而实现对冷凝温度的动态调控。
To improve the frost heave problem of embankment in cold regions, a special ground source heat pump device was proposed, to form a heat-energy-conversion embankment which can actively control the heat budget and temperature change. In order to clarify the influence of heat exchanger type and operation mode on condensation temperature and evaporation temperature, two different coil schemes of condensers were designed, and four groups of model tests with different start-stop time ratios were carried out. The results showed that when the coil spacing between the copper tubes of the condenser is 20 cm, the maximum condensation temperature of the continuous operating device can reach 45 ℃ with an average value of 40 ℃. The evaporation temperature can be below-10 ℃, and it decreases with the increase of condensation temperature. When the coil spacing is 5 cm, the average heating temperature is 70 ℃, and the evaporation temperature first decreases and then increases with the increase of condensation temperature. The heat accumulation phenomenon is easy to appear around the condenser. With the decrease of start-stop time ratio, the heating temperature decreases gradually, but the coefficient of performance shows an increasing tendency. In practical application, the coil spacing of heat exchangers should be selected reasonably during the design stage, and the start-stop time ratio should be controlled reasonably during operation stage, to realize the dynamic control of the condensation temperature.
作者
胡田飞
徐丽霞
张宗凯
HU Tian-fei;XU Li-xia;ZHANG Zong-kai(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University;School of Civil Engineering,Shijiazhuang Tiedao University)
出处
《建筑热能通风空调》
2021年第8期32-37,共6页
Building Energy & Environment
基金
国家自然科学基金(No.42001059)
河北省自然科学基金(No.E2020210044)
河北省高等学校科学技术研究项目(No.QN2020180)。
关键词
路基冻胀
地热能
地源热泵
冷凝温度
蒸发温度
frost heave of embankment
geothermal energy
ground source heat pump
condensation temperature
evaporation temperature
作者简介
胡田飞(1988-),男,博士,讲师,石石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室(050043),E-mail:hutianfei@stdu.edu.cn。
