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分户计量供热系统的调节 总被引:2,自引:0,他引:2
李风雷 《建筑热能通风空调》2006,25(6):65-68
分户计量供热系统的热源无法预知并独立控制流量的变化,其调节方法不同于传统的供热系统。本文通过对供热调节基本公式的分析,给出了分户计量供热系统调节的被控参数,结合算例计算出了供回水温度和相对流量、绘制了调节曲线,并给出了用户调节的方法,指出在分户计量供热系统调节中必须重视热源和用户调节的相互协调。 相似文献
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分析了供热采暖运行中,初调节和运行调节对供热系统节能的影响,并介绍了初调节和运行调节的几种方法。对改善供热效果、提高供热系统热能利用率有积极指导作用。 相似文献
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为了满足计量供热系统热源超量调节和超前调节的要求,避免自主调节用户加热过程的热滞后,引入逐时同类用户及其负荷系数,建立了计量供热系统间连网一次网采用固定供水温度的量调节、二次网采用主动质调节-被动量调节时的运行调节方程.通过实例计算证实了在逐时负荷比值确定后,虽然用户自主调节随机性大,但仍然能够确定供热系统在调节状态下的供、回水温度及其流量,进而预测自主调节状态下的逐时供热量. 相似文献
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从分户热计量供热系统的特征及构成入手,对分户计量方法及分户计量系统各构件的设置作了探讨,同时根据不同时刻的热负荷需求,提出各种供热调节方式,以促进分户计量供热系统的发展。 相似文献
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Field test results show that about 15% to 40% of building heat loss in China is attributable to poor heating systems regulation.
The current method for addressing this problem is to install thermostatic radiator valves (TRVs) to the ends of radiators,
a method adapted from northern Europe. However, this method has resulted in poor performance from delayed controlling action
due to thermal inertia as well as insufficient system control accuracy. This is further compounded by incorrect operation
by system users and a lack of financial incentives to regulate the system if users are not billed for their heat consumption.
We present a new method for simultaneously heat controlling and metering. The core challenge is to design a control strategy
that will maintain the room’s temperature. Thus, we established dynamic heat transfer models for water flow, the radiator
and the building so as to obtain the optimal heating strategy. We also simulated the indoor thermal dynamic performance of
the heating system with different heating loads, supply water temperatures, and supply water flow rates using three methods:
a continuously changing flow rate (Method 1), a step-change flow rate based on temperature deviation (Method 2) and an intelligent
step-change flow rate (Method 3) which predicts the duty cycle of the valve in the proceeding period and controls the valve’s
on-time. The simulation results indicate the performance of these three methods. For Method 1, as the room temperature is
above the set point, the flow rate can be automatically reduced to a level which is proportional to the room temperature deviation.
Further, the scale factor of the flow rate is designed according to the +2°C deviation, so it is accepted that the room temperature
is higher than the set point by +2°C using this method. However, this low control precision is unsatisfactory. The mean temperature
is higher than the set point and greatly affected by the heating load and supply water’s temperature and flow rate. For Method
2, the controlling action is delayed by thermal inertia, the room temperature fluctuates between the highest and lowest levels,
and the temperature deviation can be greater than the set value. For Method 3, both the simulation and field test results
showed that room temperature deviation was maintained within a ±0.5°C range under the various conditions. This method appears
relatively robust and adaptable, and was the best control strategy of the three methods. 相似文献
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浅谈住宅楼集中供热分户计量控制系统 总被引:1,自引:3,他引:1
根据我国节能法,为实现建筑节能50%的第二阶段目标,分析了我国住宅楼传统的采暖供热系统存在的一些问题,认为实行分户计量,分户控制供热系统是解决供热收费难、优化小区物业管理、实现供热系统中建筑节能的唯一途径。并提出了分户控制系统的安装型式,以有采用分户控制系统对采暖热负荷计算的影响。 相似文献
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在对供水系统运行分析的基础上,保证用水市场需求的前提下,通过调整水厂的供水量和加压站的供水范围,并对大型加压站实施分压供水等措施,产生了较好的节能效果,取得了良好的经济效益和社会效益。 相似文献
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供热管网回水温度过高的原因分析及其调节 总被引:3,自引:2,他引:3
克拉玛依地区供热管网回水温度过高的主要原因是:热用户内外部管网失调,设计中计算建筑物耗热量过于保守、锅炉容量与实际运行容量不完全适应以及采暖设备的放热效率不高,就上述原因进行了分析,、并根据理论和实际情况,提出了改进热水供暖系统的调节管理,进一步完善设计的思路。 相似文献
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人民防空地下室柴油发电机房(风冷)通风设计 总被引:1,自引:0,他引:1
结合实际工程,阐述了柴油发电机房(风冷)的通风设计思路,探讨了余热量及进风量的计算方法.建议应尽量将柴油机冷却排热量排到室外. 相似文献
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供热管网大流量小温差的测试及结果分析 总被引:1,自引:0,他引:1
通过对新疆医科大学二次供热管网的流量及供回水温度的测试,就供热系统大流量、小温差运行方式及系统的水力平衡度进行了分析,指出供热系统大流量、小温差是一种不经济的运行方式,为解决系统热力失调问题及探索新的方法提供了依据。 相似文献
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黄河小浪底电站地下厂房通风系统设计 总被引:3,自引:4,他引:3
结合电站地下厂房对外洞群较多且长,发热量大、所需通风量也大的特点,通风系统设计时采用了下送上排,上送下排多层串联的方式,在满足温湿度要求的情况下,减少了总送风量,节约了运行费用。 相似文献