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区域供冷系统枝状冷水输送管网的优化设计 总被引:1,自引:0,他引:1
在各并联管路压力损失相等的条件下建立了优化设计模型,其目标函数为系统的年度费用,由冷水泵的年运行费用、冷水泵的折旧费用、管道的折旧和维修费用及输水管道冷量损失费用组成。通过实例计算,得到以下结论:区域供冷系统冷水管路的设计不能按传统的等比摩阻或等流速设计思想进行;采用优化模型比等流速设计年度总费用约减少17%,具有明显的经济效益;若采用等流速设计,各节点的压降偏差较大,会增加运行调节的困难,容易产生水力失稳,既不利于系统的稳定运行,又增大了运行费用。 相似文献
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随着夏热冬冷地区住宅建筑空调负荷的日益增长,运用新型节能技术减少住宅建筑能耗,已成为一个很重要很紧迫的问题。新风热回收系统可以通过对新风的预热或预冷,降低空调制热或制冷能耗。为了验证新风热回收系统在夏热冬冷地区住宅建筑内的节能效果,本研究实际测量了华东地区某实验建筑中的新风热回收系统的实际节能效率。实验表明在夏季工况下热回收系统可节约14.5%的空调能耗;在梅雨季工况下可节约4.96%的空调能耗;在过渡季节则无显著节能效果。本文利用Energyplus模拟了真实工况下的热回收节能效率,并与实验数据进行对比,同时模拟了夏季全周期新风热回收装置的节能效率。 相似文献
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《建筑热能通风空调》2017,(5)
对于火电厂厂内建筑的冷热联供系统,供冷(热)工况通常采用独立系统,存在设备管路利用效率低,综合能耗高等问题。采用溴化锂双工况热泵机组,对制冷、制热工况下的设备管路系统进行集成优化设计,使用一套系统满足两种工况需求,且冬季可以吸收利用电厂辅机冷却水余热。通过控制电动阀开关、辅机启停等实现冷/热工况的切换,大大提高设备管路系统的使用效率和自动化水平。与常规方案进行技术经济对比,表明其结构精简、功能完善、投资运行费用较低。 相似文献
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《Energy and Buildings》2006,38(2):73-81
Supermarkets are great energy users in many countries. The potential for increased energy efficiency is large. One option is to utilize heat recovery (or heat reclaim) from condensers to heat the premises. Obviously this option is only interesting in relatively cold areas such as northern Europe, Canada, etc. An alternative to heat recovery is floating condensing pressure, which improves the coefficient of performance and decreases the energy consumption of the refrigeration system at lower outdoor temperature. Both heat recovery and floating condensing pressure can be utilized interchangeably depending on the heat requirements of the premises.A computer model that calculates the energy consumption in a supermarket with the possibility to simulate different system solutions for the refrigeration system has been developed at the Royal Institute of Technology, Department of Energy Technology. The software “CyberMart” is used in the present study to compare the potential of heat recovery and floating condensing in Swedish supermarkets. Measurements of different parameters such as temperatures, relative humidity and compressor power have been carried out in different supermarkets with heat recovery to validate the theoretical calculations.The present study shows that heating requirements can be covered completely by heat reclaim from the condenser. However, practical experiences show that installations are less efficient due to poor system solutions and/or control strategies. According to the results from CyberMart, the highest potential of energy saving is obtained from using a systems solution with both heat recovery and floating condensing. 相似文献
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中央空调系统冷热源的设计方案极大地影响着空调系统的初投资和运行费用,同时由于国内各地区的能源结构、政策导向、环保要求的不同都会影响方案选择的经济合理性。对冷热源选择需考虑的因素进行了叙述,比较了常用的冷热源组合方案及优缺点。以北京某办公楼中央空调系统为例,对不同的冷热源组合方案了经济分析和方案选择。 相似文献
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建立了太阳能热泵供暖实验系统,探讨了在不同太阳辐射情况下系统的运行方式,对太阳能热泵供暖系统进行了供暖实验研究。太阳能热泵供暖系统充分利用了太阳能,基本能够满足供暖要求。 相似文献
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Yue Ming Li 《Energy and Buildings》2010,42(7):1093-1099
Heat recovery variable refrigerant flow (HR-VRF) system can supply cooling and heating for the building simultaneously and make good use of the indoor cooling and heating capacity efficiently. This system has a good energy performance and can meet the emerging requirements of modern buildings. In order to evaluate the energy features of the system, a new energy simulation module is developed and embedded in the dynamic energy simulation program, EnergyPlus. Using the program with the newly developed module, the dynamic energy simulation is performed for a simplified typical commercial building. The indoor thermal comfort of the building in winter and the setting temperature of the system are analyzed. Based on the simulation results, the energy characteristics of the system are investigated, and it is indicated that different methods of the temperature control and the percentage of the heat recovery have influence on the relative ratio of the energy saving. If the HR-VRF system adopts the same temperature control method as the heat pump VRF (HP-VRF) system, the HR-VRF system promises 15-17% energy-saving potential, when compared to the HP-VRF system. 相似文献
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“非典”问题引起的对今后空调系统方式的思考 总被引:4,自引:0,他引:4
总结了“非典”防治工作对空调系统提出的新问题 ,从而提出今后要保证建筑环境的安全 ,空调系统不仅要保证热湿环境、空气质量 ,还应尽可能减少潮湿表面 ,减少灰尘聚集 ,避免各区域空气的彼此流动。从这些要求出发 ,对目前的各种空调系统方式作了评价 ,并进一步提出未来新的空调系统形式 :由新风排除人体产生的热、湿、CO2 和气味 ;由另外独立的辐射或对流系统排除围护结构等其它热源产生的显热。还讨论了系统的具体形式及能耗品质。 相似文献
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随着生活水平提高,人们对热水供应系统的要求也随之提高。不仅要求高效、经济,还要节能环保。最符合人们要求的热水供应系统应为太阳能、空气源热泵以及太阳能和空气源热泵组合的热水供应系统。 相似文献
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上海某新建高校采用天然气分布式能源系统通过供能管网实现区域供能。能源中心以天然气作为一次能源,采用冷热电三联供技术,并辅以电制冷机组和燃气热水锅炉作为调峰设备,可满足该新建校区所有冷热负荷需求,能源综合利用效率达到80%以上。能源中心通过校区各二级泵房向各空调末端直接提供循环冷热水,通过校区各热交换机房提供生活热水一次侧热媒。空调供能管网及生活热水热媒管网均采用两管制闭式循环系统。目前该能源中心及供能系统已成功运行。 相似文献
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H. W. Porter BSc. DPhill R. Morgan MA. PhD. FInst P. MIM MCIBSE J. Rosell BA MSc. DPhill. 《国际自然能源杂志》2013,34(4):189-198
The ventilation requirements of a low energy house are assessed, and measurements are presented of the performance of the mechanical ventilation and heat recovery system which was installed. The results are discussed in terms of energy and financial savings. The ventilation system is necessary for healthy habitation, and energy is saved by reducing uncontrolled ventilation, but the savings due to heat recovery are not justified economically. 相似文献