共查询到20条相似文献，搜索用时 15 毫秒
1.
王利霞 《雁北师范学院学报》2011,27(2)
介绍了置换通风加冷却顶板空调系统,分析了冷却顶板所承担制冷量的大小和冷板在顶棚的位置对室内气流的影响,总结了针对该系统结露问题的解决措施,为该系统在工程上的应用提供一定参考。 相似文献
2.
采用DeST-h软件分析了伊朗马什哈德地区居住建筑PVC板对建筑冷负荷的影响,并利用计算流体力学软件模拟分析了夏季建筑室内的自然通风情况,以确定室内风速.建筑室内风速的模拟结果表明,室内大部分区域是舒适的.在天花板和PVC板之间有无空气层存在的情况下,建筑顶层房间冷负荷分别减少10.5%和6.5%,说明空气层的存在有利于建筑降低冷负荷.然而,空气层厚度的增加对建筑冷负荷降低的影响并不明显.这种在天花板和PVC板之间增加空气层的策略对发展可持续性建筑十分有益. 相似文献
3.
4.
从熵态视角对空调负荷进行划分,基于双温冷源空调系统基础上,根据不同新风处理方法,探讨设计参数选取及负荷计算。通过系统优化遵循“高熵负荷用高温冷源消除,低熵负荷用低温冷源消除”的原则,除高温冷源降温外,提出串联高、低温冷源的除湿循环,建立双温冷源能耗模型,数值模拟计算得到最佳除湿、除热冷源有效温度。 相似文献
5.
蒋雅彬 《十堰职业技术学院学报》2014,(2):110-112
针对东风水务公司吴家沟水厂螺杆式空压机温升过快散热不良,导致开机后半小时内停机现象。分析原因,结合现场,通过通风管开维修孔方便清洗散热片,调节散热风扇启动温度,通风管内加装挡板以达到针对性抽风,减少通风管旁路等方法,改善散热效果,解决了空压机频繁停机故障,保证了空压机正常运行,减少故障率。 相似文献
6.
7.
以福州地铁四号线的一个地铁隧道区间为研究对象,利用FLUENT构建车头电气火灾的数值模型。重点分析了在阻塞比为0.38与0.55条件下火灾烟气的运动特征及对疏散人员的影响。模拟结果表明:在火源上游位置,在未开启通风和开启通风的条件下,高温烟气聚集在隧道顶部,随高度下降,烟气温度降低,建议设置离轨面高度较低的疏散走道以提供更大的安全空间。同时,在未开启通风,且火源释热率及火灾发展时间相同的情况下,高阻塞比隧道内的初始温度较高;开启纵向通风后,对流换热增强,降温快,高温烟气在火源上游沿隧道长度方向、高度方向的运动都能得到有效的控制,有利于人员疏散。最后,给出了纵向通风条件下的疏散方案及建议。 相似文献
8.
The high temperature heat pump and desiccant wheel(HTHPDW) system can make full use of heat released from the condenser of heat pump for DW regeneration without additional heat. In this study, DW operation in the HTHPDW system was investigated experimentally, and the optimization analysis of HTHPDW system was carried out. The performance of DW had influence on the dehumidification(evaluated by dehumidification and regeneration effectiveness) and cooling load(evaluated by thermal and adiabatic effectiveness). The results show that the enthalpy increase occurred in all the experiments. Compared to the isosteric heat, heat accumulation in the desiccant and matrix material and heat leakage from regeneration side to process side have greater influence on the adiabatic effectiveness. Higher regeneration temperature leads to lower adiabatic effectiveness that increases more cooling load of the system. When the regeneration temperature is 63℃, the maximal dehumidification effectiveness is 35.4% and the satisfied adiabatic effectiveness is 88%, which contributes to the optimal balance between dehumidification and cooling. 相似文献
9.
为了研究高大空间建筑喷口送风系统的吹风感分布,在大空间实验室中进行了夏季工况的实验测试,得到了喷口高度为4m时人体活动区域温度场、速度场和吹风感的分布.然后,采用计算流体力学的方法对实验工况进行模拟计算.将室内垂直温度和冷吹风感分布的计算结果和实测数据进行对比验证,结果显示吻合良好.在此基础上进行了不同喷口高度处工况的模拟计算,通过分析3个工况下人体活动区域的吹风感和温度,获得了较理想的送风工况.模拟结果显示,喷口高度为5m时吹风感分布较为理想,温度场和速度场较为均匀. 相似文献
10.
建立了含内热源的液池内自然对流与冷却盘管内强制对流耦合传热的三维物理、数学模型,进行了相应的数值模拟计算。分别对不同内热源强度,不同冷却流体流量下液池内流体温度场以及液池与盘管内溶液换热系数进行了分析,得出换热系数随内热源强度和冷却流体流量的变化曲线,并与实验值进行了比较。结果表明盘管冷却传热模型能够较好的反映液池内的换热。 相似文献
11.
Itiswellknownthatthereexistsanindoortempera turedistribution[1] inbuildingrooms.Asthedistancetotheexternalwallvaries ,thetemperatureisdifferent .However,whenwedesignaheating ,ventilationandairconditioning (HVAC)system ,theindoorairvolumeisstillmodeledas“onepoint”or“perfectlymixed”untilre cently.Thisnegligenceofindoortemperaturedistribu tionsisoneofthemainreasonsofthemalfunctionoftheair conditioningcontrolsystem ,whichinturncausesthecomplaintsoftheroomoccupantsaboutindoorthermalcomfort.Th… 相似文献
12.
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
13.
介绍了2001年夏天对南京某一建筑围护结构的衰减倍数与延迟时间进行现场测试的情况.根据房间的内表面吸热频率响应、内表面温度、室内气温和室外综合温度,可计算出建筑围护结构的衰减倍数与延迟时间.实验结果表明,对于建筑围护结构热传导的衰减倍数与延迟时间,0阶和1阶的现场测试值与理论计算值比较吻合,2阶值则相差很大,因此很难精确测试出2阶值.然而,现场条件下基于1阶以内来分析建筑围护结构的衰减倍数与延迟时间仍然是可行的,因为在计算1阶时建筑围护结构的衰减倍数已达到20,完全可以满足工程要求. 相似文献
14.
15.
Indoor environment separated with down.feed air curtain was numerically simulated and experimentally researched.Indoor airflow and temperature fields separated with air curtain were numerically simulated.Resuits show that both polluted airflow and thermal air current can be separated with a down.feed air curtain to prevent contaminants from spreading in the room space.In a test chamber.the smoke of burning Tibetan incense served as the source of contaminants.and the probe test shows that 1.0 pm is the prevailing diameter of the smoke particles.During the release of the smoke.the particle concentration of the indoor air was tested with a laser particle counter at the points of three different heights from the floor when the air curtain was running or not.Experimental results show that the higher the test point is located,the lower the particle concentration is,implying that the separating or isolating eflfect decreases as the air velocity of the curtain reduces along with the height descends.According to both simulation and experimental results.down.feed air curtain can separate indoor environment effectively when the supply air velocity of air curtain is not less than 3 m/s.In order to strengthen separation effect,it is suggested that the supply air velocity be speeded up to 5 m/s. 相似文献
16.
In the beach well intake system, heat is transferred from soil to fluid when seawater is filtered through the aquifer, providing higher temperature source water to the seawater source heat pump (SWHP) system in winter. A 3-D coupled seepage and heat transfer model for studying beach well intake system is established by adopting the computer code FLUENT. Numerical results of this model are compared with the experimental results under the same conditions. Based on the experiment-verified coupled model, numerical simulation of the supply water temperature is studied over a heating season. Results show that the minimum temperature of supply water is 275.2 K when this intake system continuously provides seawater with flow rate of 35 m3/h to SWHP. Results also indicate that the supply water temperature is higher than seawater, and that the minimum temperature of supply water lags behind seawater, ensuring effective and reliable operation of SWHP. 相似文献
17.
何华明 《福建工程学院学报》2019,(4):382-385
针对室内排风的热回收效率不高的问题,设计了一种基于间接蒸发冷却技术的新回风换气机,采取微雾喷淋方式的水蒸发冷却技术和亲水高分子纤维的芯体,可实现高效热回收。通过建立实验平台,对该新换热气机的换热过程进行了测试分析,结果表明热回收效率高达141%,节能效果显著。 相似文献
18.
19.
《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
20.
设计了一种热泵驱动的溴化锂溶液深度除湿机组,该机组适用于无回风可利用、低湿度需求的场合.机组的性能测试结果显示,当室外温度为28～31℃,含湿量为11～14g/kg时,机组的送风温度为1.6～2.6℃,含湿量为2.6～3.0g/kg,系统COP为1.8.测试时发现了一个造成冷热溶液混合损失的管路链接问题,并对其进行修改.然后,对修改后的新机组进行了性能测试,结果显示,在室外温度为25～32℃,含湿量为18～21g/kg时,机组的送风温度为3.2～4.0℃,含湿量为3.4～3.6g/kg,系统COP为2.8.最后,对机组建立数学模型,并将模拟结果与实测数据进行比较,结果表明管路改动使机组性能提升约20%. 相似文献