共查询到20条相似文献，搜索用时 171 毫秒
1.
对空气源热泵热水器在不同工况下的性能进行了实验研究,并对环境工况和进水温度对排气压力、排气温度、消耗功率、制热功率、热效率等性能的影响进行了理论分析。结果表明,排气压力、排气温度和消耗功率随着进水温度的升高而增加;制热功率和性能系数随着进水温度的升高而降低;系统的性能是随着环境温度的升高而有利的。 相似文献
2.
以唐山市区为例,介绍了土壤土质特性与建设土壤源热泵系统适宜性的关系,通过试验测定了土壤层温度的变化,给出了土壤导热系数的确定方法,并模拟分析了土壤层不同的初始温度和土壤导热系数对地埋管换热器传热的影响。 相似文献
3.
地源热泵利用地下浅层地热资源作为热源,由于较深的地层中在未受干扰的情况下常年保持恒定的温度,既高于冬季的室外温度,又低于夏季的室外温度,因此地源热泵可克服空气源热泵的技术障碍而且效率大大提高。土壤的原始地温,既是计算地源热泵系统地下埋管换热动态过程的原始条件,也是地源热泵系统设计计算的依据。通过为期一年的原始地温测试在整理和分析大量实验数据的基础上,可以得到利用线性加权和法确定土壤的平均原始地温,与实测值相比非常接近。 相似文献
4.
《实验室研究与探索》2019,(9):52-57
使用数值模拟方法建立了地埋管换热器三维模型,并使用文献数据和热响应测试数据验证了此模型。考察了地下渗流水水温度、流速对地埋管换热量的影响,得出不同条件下地埋管的单位井深换热量。通过模拟发现,在未渗流情况下,地源热泵存在严重的热堆积;地下水渗流可消除热积聚,且地下水渗流的温度和速度对热迁移有着规律性的影响。当地下水温处于冰点以上时,水温越低,渗流速度越大,地下水渗流可更好地消除热积聚现象,且高渗流速度可确保单位井深换热量尽早达到稳定状态。 相似文献
5.
地源热泵系统具有舒适环保、高效节能的特点,在各类建筑中得到越来越广泛的应用。地埋管作为地源热泵空调系统的核心部位,其施工质量的好坏将直接影响空调效果。文章对地埋管施工过程的质量控制要点进行阐述。 相似文献
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7.
谢昊 《连云港职业技术学院学报》2012,25(1):10-13
通过对高层建筑利用土壤源热泵技术与传统供冷供热系统的对比分析,认为采用新能源技术要比传统空调系统更经济、更可靠、更稳定;并对深基坑底板下中采用双U地埋管施工质量控制技术要点进行了分析。 相似文献
8.
《实验室研究与探索》2016,(3)
建立了一套蒸发式冷却器实验装置,模拟实际工况下喷淋密度、风量及复合管热阻对蒸发式冷却器传热性能的影响,研究了复合管替代碳钢管应用于该冷却器的可行性。实验结果表明,模拟工况为湿空冷时,复合管传热性能与普通碳钢管接近,增加配风量能够提高蒸发式冷却器的传热性能,并存在最佳喷淋密度。通过实验得到了复合管管外水膜传热传质系数关联式,为工业应用提供了可靠依据。 相似文献
9.
赵巍陈琴珠王学生石仲璟 《实验室研究与探索》2016,(3):70-72
建立了一套蒸发式冷却器实验装置,模拟实际工况下喷淋密度、风量及复合管热阻对蒸发式冷却器传热性能的影响,研究了复合管替代碳钢管应用于该冷却器的可行性。实验结果表明,模拟工况为湿空冷时,复合管传热性能与普通碳钢管接近,增加配风量能够提高蒸发式冷却器的传热性能,并存在最佳喷淋密度。通过实验得到了复合管管外水膜传热传质系数关联式,为工业应用提供了可靠依据。 相似文献
10.
为了实现对中密度纤维板干燥系统的余热回收节能改造,设计了一套纤维干燥尾气余热回收实验装置,介绍了该实验系统的工作原理、流程和硬件结构。该装置由可旋转式气-气热管换热器,空气加热温控装置,加湿、加灰处理装置,空气参数测试控制系统,冷热端风机组成。经过实际应用证明,该装置设计合理,工作安全可靠,测试精度高。使用该装置可以模拟现场纤维干燥尾气工况进行换热器换热性能和积灰特性实验,可以准确方便地研究不同工况下热管换热器的换热性能,热管壁面温度、空气压力的分布规律,热管翅片形态、旋转角度对换热器性能和积灰情况的影响。为纤维干燥余热回收设备的研制提供基础数据和技术依据。 相似文献
11.
Experimental investigation on system with combination of ground-source heat pump and solar collector
This paper presents the heating performance and energy distribution of a system with the combination of ground-source heat pump and solar collector or a solar-assisted ground-source heat pump system (SAGSHPS) by calculation and experiment.The results show that the average absolute error is less than 0.6 ℃ and the relative error is less than 5% under the pulse load when the analytical solution to the 2-D solid cylindrical source model is used for the SAGSHPS.The coefficient of performance (COP) of the SAGSHPS is 2.95-4.70.The average fluid temperature in the borehole heat exchanger can increase by 3 ℃ with the assistance of solar collector,which will improve the COP of the heat pump by approximately 10% from the experimental data.The energy contributions to the total heating load of soil,electricity and solar are 56.30%,36.87% and 6.83%,respectively. 相似文献
12.
为进一步提高太阳能利用效率和太阳能辅助空气源热泵供热系统的性能,提出了一种新型太阳能空气源热泵供热系统,并研究了该供热系统的性能和特性.基于自行设计的10kW空气源热泵,建立了供热系统的数学模型,通过模拟得出了不同环境温度和出水温度下供热系统的运行特性和性能规律.结果表明：基于新型太阳能辅助空气源热泵供热系统,热泵的性能得到较大的提高.当环境温度为7℃时,空气源热泵的COP最大可增加26%.这为进一步研究新型太阳能辅助空气源热泵供热系统在供暖季节的性能奠定了基础. 相似文献
13.
《家用空气源热泵辅助型太阳能热水系统技术条件》中对整机综合制热性能系数（COP）试验的平均环境温度和全天太阳能辐照量给出了一定变化范围,为研究这一变化对整机综合COP的影响,将整机的性能试验分两个阶段进行,其中太阳能热水系统加热段在户外进行,空气源热泵加热段在环境温度可控的环境试验室进行。试验表明在标准规定的变化范围内,平均环境温度的变化及全天辐照量的变化对空气源热泵辅助太阳能热水系统整机综合COP有较大影响．其中因平均环境温度的变化及全天辐照量的变化对太阳能热水系统性能影响而引起整机综合COP的变化较小．而因平均环境温度的变化对空气源热泵性能的影响而引起整机综合COP的变化最大可达40％左右。据此对该标准的试验方法、试验条件提出了修改建议。 相似文献
14.
A mathematical optimization model was set up for a ground-solar combined system based on in-situ experimental results,in which the solar collector was combined serially with a ground-coupled heat pump(GCHP).The universal optimal equations were solved by the constrained variable metric method considering both the performance and economics.Then the model was applied to a specific case concerning an actual solar assisted GCHP system for space heating.The results indicated a system coefficient of performance(COP)of 3.9 for the optimal method under the seriaI heating mode,and 3.2 for the conventional one.In addition,the optimum solution also showed advantages in energy and cost saving.1eading to a 16.7%improvement in the heat pump performance at 17.2%less energy consumption and 11.8%lower annual cost,respectively. 相似文献
15.
为深入了解HFC125跨临界循环热泵热水器的运行特性,设计和建造了一个直流变频热泵热水器实验装置,对HFC125跨临界循环热泵热水器性能进行了实验研究,发现压缩机运行在95Hz时系统存在一个COP峰值.然后以95Hz为例,研究了系统COP与压缩机频率、冷凝压力、蒸发压力、冷却水温升、压缩机排气温度等参数的关系,并与R410A亚临界循环系统性能进行了比较.结果表明：系统存在一最优频率,此时系统有较好的COP值,系统COP随冷凝压力和压比的降低呈上升趋势,而蒸发压力基本恒定;当冷却水温升超过47.5℃时,COP迅速下降.相对R410A亚临界循环,HFC125跨临界循环系统COP显著提升,提高幅度平均在12%以上. 相似文献
16.
An air source heat pump system (ASHPS) used in an office building is set up and studied experimentally. Its operating performance in winter is evaluated based on test data and a comparative discussion is given on the effect of climate conditions and heating load ratio on the operation behavior. Then heating capacity variation caused by evaporator frosting is analyzed as well. Finally, the defrosting parameters and the technical feasibility are studied for a constant heating demand. The experimental results indicate that both the outlet water temperature drop and the system COP should be taken into account when setting defrosting parameters, and ASHPS is a viable technology for space heating and hot-water production in winter in Tianjin, which can maintain the room temperature above 19 ℃ when the outdoor temperature is -2 ℃. 相似文献
17.
In order to utilize solar energy effectively and to achieve a higher electrical efficiency by limiting the operating temperature of the photovoltaic （PV） panel, a novel photovoltaic/thermal solar-assisted heat pump （PV/T-SAHP） system was proposed and constructed. The hybrid solar system generates electricity and thermal energy simultaneously. A distributed parameters model of the PWT-SAHP system was developed and applied to analyze the system dynamic performance in terms of PV action, photothermal action and Rankine cycle processes. The simulation results indicated that the coefficient of performance （COP） of the proposed PV/T-SAHP can be much better than that of the conventional heat pump. Both PV-efficiency and photothermic efficiency have been improved considerably. The results also showed that the performance of this PV/T-SAHP system was strongly influenced by the evaporator area, tube pitch and tilt angle of the PV/T evaporator, which are the key factors in PV/T-SAHP system optimization and PV/T evaporator design. 相似文献
18.
为建立空气源热泵热水器COP随室外环境温度和水箱温度变化的动态模型,先测定了某一空气源热泵热水器随环境温度和水温变化的COP,引入了卡诺因子,得出了COP的拟合公式,并与测试数据进行了对比,对比表明COP的拟合公式精确度较高,能够满足实际工程应用需要。同时．为使该拟合公式对不同性能的空气源热泵热水器具有普适性,在上述公式的基础上引入COP修正系数,得出了适合不同性能空气源热泵热水器COP的拟合公式．经实验对比．表明该公式也能较好的满足实际工程应用需要。 相似文献
19.
针对常规污水源热泵系统出力常无法满足建筑最大负荷的问题,提出了在高峰负荷下提取污水凝固潜热作为补充热源的新思路.首先,结合污水特征设计了一种集除冰、取热、除垢于一体的凝固换热器,并给出了城市污水源采集凝固热热泵的合理形式.然后,从理论上分析探讨了新系统的供热潜力.典型的工况计算结果表明,采集凝固热热泵系统的供热能力大于常规城市污水源热泵系统,两者的最大供热率之比在4.5～8.7之间,说明该污水源采集凝固热热泵系统在寒冷地区的应用潜力较大. 相似文献
20.
The experimental performance of small-sized ground-coupled heat pump (GCHP) is researched intensively. However, there are little data documenting the operation performance of existing large-sized GCHP system. We presented the actual performance measurement of a GCHP installed for apartment buildings in Wuhan, Hubei province, P. R. China. The system was constructed with a closed vertical typed ground heat exchanger with a total pipe length of 32 000 m. During one year, various operating parameters were monitored, including the outdoor temperature, the flow rate, the electrical consumption, and the water temperature. The seasonal coefficients of performances of the heat pumps and the system based on the measured data were found to be 4.01 and 2.96 in the cooling season, and 3.54 and 2.86 in the heating season, respectively. The GCHP system was more economical than the air-source room air conditioner in the energy efficiency which was increased by 29 in cooling mode and 50 in heating mode. There was an obvious heat imbalance of soil between the injection rate and the extraction rate in the residential GCHP system operation. 相似文献