In order to study the influence of component migration on the circulation and heat transfer pinch point of non-azeotropic mixed working fluid, a theoretical model of high temperature electric heat pump was established. Based on the calculation condition of waste heat recovery in a chemical field, four pure working fluid with better performance were selected according to the requirements of circulating working fluid screening. According to the cycling performance characteristics of the working fluid, they were combined into the mixed working fluid in pairs, and the theoretical analysis of these five mixed working fluid was carried out. Two groups of working fluid combination with better cycling performance were screened out, namely R134a+R245fa（0.4/0.6） and R152a+R245fa（0.4/0.6）. In addition, the correlation between the heat transfer pinch point and component migration of the selected two groups of working fluid was calculated, and the nonlinear distribution of enthalpy in the heat exchanger with component migration considered was obtained. And the result was compared with that without component migration consideration so as to provide theoretical basis for the design and operation of evaporator and condenser. The results show that there are heat transfer pinch points at enthalpy 321.35 kJ/kg and 334.76 kJ/kg, and the size and location of the heat transfer pinch points and the maximum heat transfer temperature difference are affected by component migration.

为满足空气源热泵冬季集中供热的需求,该文采用新型工质将空气源热泵的制热温度提高至90℃以上.首先建立高温空气源热泵的数学模型并对该系统进行理论计算,进而搭建高温空气源热泵试验台,分别在环境温度为0、5、10℃时对模拟结果进行实验验证,当热水进口温度为80℃时,系统实际COP分别较理论结果低5.9%、5.3%和1.7%.该空气源热泵相比现有技术提升制热温度40℃以上,因此具有较好的市场应用前景和推广意义.

Aiming at the technical problem of limited temperature range in the application of conventional heat pump in the field of industrial waste heat utilization，this paper studies the production of about 130 ℃ hot water or steam by a compression-absorption coupled heat pump systems under the condition of large temperature rise. In this paper，the operation principle of coupled heat pump cycle is introduced，and the complete thermodynamic model of coupled heat pump is constructed. Through the optimization function calculation of EES software，it is found that the lower the absorption side pressure is，the better the cycle COP is. At the same time， under the constraint conditions that the temperature of concentrated solution at the outlet of solution heat exchangers is 10℃higher than the crystallization temperature and the range of solution steam discharge is 5.0%-5.5%，taking an industrial waste heat recovery condition as the design condition，the results show that the inlet and outlet temperature of waste heat hot water is 90/75℃，the flow rate of residual hot water is 30 kg/s，the inlet and outlet temperature of high temperature hot water is 100/125℃，the optimal pressure values of absorption and generation side are 40 kPa and 2.2 kPa respectively，and the COP of the corresponding coupled heat pump is 9.8. In the same way，the cycle performance of the system with different outlet temperature of waste heat hot water and high temperature hot water outlet is analyzed，and it is verified that the cycle still has good virtual performance coefficient at high heating temperature.

常规天然气锅炉排放的烟气中含有大量水蒸气,因其未能将烟气降低到露点温度以下而无法有效回收水蒸气冷凝潜热.该研究采用混合工质HD-01的电动热泵与间壁式换热器深度回收天然气锅炉烟气余热.搭建烟气余热深度回收实验平台,并基于实验结果完善烟气余热深度回收理论模型.实验结果表明,该系统平均排烟温度为33.1℃,烟气消白效果明显.该系统可将热网回水温度从42.9℃平均提升至60.0℃,实际余热回收功率占锅炉平均功率的8.7％,平均制热性能系数(coefficient of performance,COP)约5.4.经济分析表明,该系统余热回收成本约为19.5万元,每年可节省87746.44元,投资回收期为2.2年.该系统供热成本相比天然气锅炉节省近49.0％.

碳达峰和碳中和目标对各个行业降低碳排放都提出了更高的要求,未来我国能源结构也将进行重大调整,常规行业降低碳排放及可再生能源充分利用将成为重要的研究方向。在诸多节能减排技术中,热泵技术由于其显著的节能减排效果在民用及工农业中得到了广泛应用。针对热泵技术在分散式家用冷热领域,集中供热领域,农业、工业及储能行业的应用进行了综述分析。热泵技术研究未来将集中在新型循环流程、新型环保工质及关键部件研发等领域,在碳达峰、碳中和目标背景下成为具有显著节能减排效果的技术路线。

天然气烟气中水蒸气含量较高,大多未被回收而直接排入大气中,回收烟气中水蒸气的冷凝热,不仅能从外观上实现"消白"的目的,更能显著提高天然气的利用效率.根据天然气烟气水蒸气冷凝温度回收烟气热量以制取高温热水为目的,研究该工况下高温电动热泵适配混合工质的性能,对R134a+R245fa、R124+R245fa、R227ea+R142b、R134a+R142b、R124+R152a 和R227ea+R152a 六种二元混合工质进行理论研究,分析它们在蒸发温度为40～50℃,冷凝温度为70～80℃工况下的循环性能.通过对比分析,最终得到R134a+R245fa(0.4/0.6)在该工况下的循环性能最优.

工业能耗占我国总能耗超过70％,而其能源利用效率不足50％,因此工业余热高效回收利用是节能减排的重要途径之一.热泵技术是提升能量品位的有效方法,但吸收式热泵需要配置三个不同温度品位的热源或热汇,而电动热泵受热力学循环、工质物性、压缩机耐温耐压限制以及避免润滑失效一般只能工作于有限温度范围(<100℃)之内,因此该研究将吸收式循环与压缩式循环进行深度耦合,用于直接回收工业余热制取高温热水,同时确保压缩机的安全稳定运行.该文首先分析耦合热泵换热器的运行原理,其次建立了耦合热泵换热器的数学模型,最后对模型进行求解分析了关键参数对耦合热泵换热器性能影响变化规律.在设计工况下,当制取133℃热水时,耦合热泵换热器COP达到3.6,压缩机排气压力为1.2 MPa,排气温度为79℃,远低于压缩机耐温耐压上限和润滑油失效温度,因此耦合热泵换热器在利用余热制取高温热水或蒸汽领域具有一定的应用潜力.

提出一种将吸收式循环和压缩式循环深度耦合的新型机组,解决以溴化锂溶液为工质的吸收式制冷机无法制取0℃以下冷却盐水的技术难题.首先分析耦合机组的循环原理,其次建立各部件数学模型以构建其系统稳态模型,通过设备仿真揭示耦合循环双相变换热器蒸发冷凝温度、水蒸气压缩机压比和盐水出口温度对制冷机性能的影响规律,最后与常规电制冷机进行经济性对比.计算结果表明,耦合循环具有良好的循环性能和经济性,因而在工业节能减排领域具有较好的应用前景.