关于热水供热系统的供热调节

讲述了对各种热水供热系统,调节方法,进行了比较和分析。     

大型太阳能热水装置与燃油锅炉联合供热系统

１概况随着人们对环境意识的日渐增强,济南市府文件规定,本市二环以内各单位,一律不许用燃煤锅炉供热,以改善济南市区较为严重的环境污染问题。济南市舜耕山庄位于千佛山脚下,环境优美,是济南市难得的好去处。但由于历年来山庄内几台燃煤供热锅炉终年浓烟滚滚,使一处好庄园顿感失色。去年在市府文件下达后,改造旧燃煤锅炉房的春风,终于吹进了舜耕山庄。济南市舜耕山庄是有２２０套客房的三星级涉外旅游宾馆,供热要求条件较高。山东格致热工设备有限公司从设计到施工,全面承包了这一改造旧燃煤锅炉房的任务,提出了燃油锅炉与大型…     

平板型太阳能热水供热系统防冻方法探讨

平板型太阳能集热器在恶劣气候环境下会造成冻裂。本文提出了解决防冻问题的若干想法。     

浅析热水供暖系统的供热调节

论述了热水供暖系统的供热调节与设计、施工及运行管理三者之间的关系,及其重要性。     

青藏线太阳能热水供热系统的经济性分析

运用灰色物元法对太阳能热水供热系统与几种常规能源热水供热系统进行经济性比较 ,分别从初投资、年经营费、安全性、环境影响、技术先进性、操作管理等六个方面进行了定量对比分析。通过建立灰色物元矩阵、满足度函数、确定关联度、确定各评价指标权重等最终确定了最优方案 ,为工程方案的确定提供了理论依据     

民用建筑热水锅炉供热系统浅析

现今的民用建筑中，热水除作为生活热水外，还有一个重要的用途就是用作空调采暖的热水。热水的来源一般由区域的热力管网或者建筑物所属的锅炉房来提供。在以前的锅炉房设计，主要选用蒸汽锅炉，再通过汽一水换热器产生热水；而近十几年，大量的中外热水锅炉得到了广泛使用。     

关于热水供热系统运行方式的经济性研究

通过对热网内循环水及热网在不同状态下物理特性的研究分析得出连续供暖的运行方式优于间断供暖运行方式的结论。     

热水供热系统的调节技术

针对室外温度的变化,即供热初期和供热末期室外温度较高,而供热中期室外温度较低,采用分阶段改变流量的质调节方式,对某厂区厂外和厂内两个供热系统的循环水泵配置进行了改造,并且计算和测试了节电情况,认为这种供热技术是可行的.     

热水供暖供热系统的节能设计

热水供暖供热系统大流量、小温差运行必将带来高能耗。用于控制循环水泵动力消耗的指标—耗电输热比，应与热源和热用户型式、供回水温差和水泵效率等有关。以热水供暖供热系统水力计算结果为基础，根据并联环路节点压力平衡的水力学规律，利用热平衡的基本方程，导出的用于克服水力失调引起的热力失调的热用户换热设备面积修正系数的计算公式，可以用于节能型系统的设计。     

太阳能热泵供热水系统的实验研究

在青岛地区建立一套太阳能热泵实验系统，此系统可以完成冬季太阳能热泵供暖(启动热泵)和非采暖季太阳能直接供热水实验。进行了太阳能热泵冬季供暖的实验研究，测得热泵机组的平均供热系数COP＝2．71。     

洗浴用热泵热水系统的应用

改革开放以来,我们昆明市的高层住宅楼逐渐增多。在高层往宅楼顶上,由于屋面紧张不能满足大面积安装太阳热水器的需要。在这种情况下,云南师大太阳能研究所陈仲华副教授带领课题组,首次在云南省政府金牛任宅小区的6幢13层     

高跨比对日光温室综合影响的研究

针对三面环墙一面透光的日光温室系统,利用数值计算的方法,分析了不同高跨比的日光温室在夜间由墙体、土壤和后坡放热时室内的温度场和速度场.综合考虑日光温室墙体蓄热以及经济适用性和结构稳定性等方面的因素,提出了适宜的高跨比取值范围为0.4～0.5.     

热泵与热泵热水系统

热泵技术是近年来在全世界倍受关注的新能源术，目前较多地应用于冷暖空调机。很多人对热这个词很生疏。大家知道，泵是一种能提高位能机械设备，常见的有水泵、油泵、气泵等。水泵要提高水位或增加水压；油泵主要用于供油系统油压设备；气泵主要用于提高空气的压力。人们常使用的打气筒也是一种简单的往复式气泵。这泵都是对接触的物质直接做功。人们一般认为热”不是物质，而是一种能，不可能通过泵来提位能。那么，热泵究竟是个什么概念，又是怎样作的呢？“热”是必须通过载体携带并传递的。载体可是固体，如金属；液体，如水；也可以是…     

Steady-state investigation of water vapor adsorption for thermally driven adsorption based greenhouse air-conditioning system

In the present study, water vapor adsorption onto silica-gel, activated carbon powder (ACP) and activated carbon fiber (ACF) has been experimentally measured at 20, 30 and 50 °C using a volumetric method based adsorption measurement apparatus for greenhouse air-conditioning (AC). The Guggenheim–Anderson–De Boer and Dubinin–Astakhov adsorption models are used to fit the adsorption data of silica-gel and ACP/ACF, respectively. The isosteric heat of adsorption is determined by Clausius–Clapeyron relationship. The adsorbents are evaluated for low-temperature regeneration with aim to develop solar operated AC system for greenhouses. Ideal growth zone for agricultural products is determined by which the steady-state desiccant AC cycle is evaluated on the psychometric chart and adsorption isobars.Steady-state moisture cycled (MC_SS) by each adsorbent is determined for demand category-I, II and III which are based on 60%, 40% and 20% relative humidity of dehumidified air, respectively. In case of demand category-I, the ACP enables maximum MC_SS at all regeneration temperatures (T_reg), ideally sitting at 47 °C. The ACF enables double MC_SS as compared to silica-gel during demand category-II at T_reg ≥59 °C. However, the silica-gel is found the only applicable adsorbent for the demand category-III.     

小型牛奶收集站热泵热水供应系统应用分析

以日产2.0t的小奶站为例,提出利用热泵技术回收鲜奶余热加热牧场清洗用水的热水供水系统.分析和计算了采用热泵技术后的节能量,并对锅炉热水系统和热泵热水系统的投资成本、年运行费用及经济效益和社会效益进行了分析.两种方案比较表明:采用新的热泵热水供应系统一举多得,多投资部分两年就能收回.     

使用热泵的地热水供热系统

目前普遍存在地热水不合理使用现象，文中介绍使用热泵和回灌的新型地热水供热系统及热力计算，认为可解决地热水浪费和地热供热事业可持续发展问题。     

Heat pump system utilizing produced water in oil fields

As the alternative to the heating furnace for crude oil heating, a heat pump system utilizing produced water, a main byproduct, in oil fields was proposed and the thermodynamic model of the system was established. A particular compression process with inner evaporative spray water cooling was applied in the screw compressor and an analysis method for the variable-mass compression process was introduced. The simulation results showed that the efficiency of the screw compressor, the temperature of produced water and the temperature difference in flash process are key parameters affecting the system performance. The energy cost of the heat pump system was compared to that of the heating furnace, revealing that the heat pump system with EER, 4.67, would save over 20% energy cost as compared with the heating furnace. Thus, the heat pump system was energy saving, money saving and environmentally benign.     

Experimental study of the burning-cave hot water soil heating system in solar greenhouse

In the northern China areas, the traditional heating methods are widely used in solar greenhouse, for example: electric heating, hot air heating, hot water heating, burning-cave heating etc. If copying the assuring building indoor environment of constant heating ways into solar greenhouse, it will further increase building energy consumption, thus improving the efficiency of energy utilization, establishing appropriate growing environment, and realizing the agricultural waste recycling are important ways of consistent with the Chinese conditions, construction of sustainable development, improving the efficiency of the greenhouse production. To solve the problem of traditional heating method for high heating energy consumption, the inharmonious between greenhouse air temperature and soil temperature, uneven soil temperature, the research build the burning cave hot water soil heating system of solar greenhouse experimental platform in accordance with principle of energy cascade utilization. This experiment platform will transfer burning cave internal heat into soil heating system. The soil is evenly heated by system. Through testing the actual operation effect of the burning cave hot water soil heating system of new solar greenhouse, electric heating system, no taking any heating measures system, burning cave hot water soil heating system of solar greenhouse can improve the soil average temperature 5 ∼ 6 °C. This research provides experimental basis for practical applications and promotion.     

Heat recovery system for dishwashers

In this paper a heat recovery system for a dishwasher is proposed and analysed. The idea is to use the heat coming from the wastewater of the dishwasher to heat the fresh water entering the dishwasher. The potential of energy recovery is studied technically and economically. A prototype was built and experiments on it are discussed. Results of the measurements show the thermal potential. They are also used to validate a design calculation procedure. With this an improved design is proposed. Recovery of the heat in the wastewater is proven to be economically beneficial.     

Investigation of a new solar greenhouse drying system for peppers

Solar drying is the oldest preservation technique of agricultural products using several types of solar crop dryers based mostly on solar energy, which is abundant, renewable and sustainable. This study aimed to modeling a new solar greenhouse drying system (SGDS) for the drying of red peppers. The proposed mixed-mode (SGDS) consists of two main parts, namely a flat plate solar air collector and an experimental greenhouse. A mathematical model is developed using the TRNSYS simulation program to predict the change in the drying kinetics during the drying process under our proposed (SGDS). The experimental part consisted in testing the solar air collector to investigate its performance. The test showed that this solar air collector has a good performance; its efficiency varies between 0, 5 and 0, 65. The model was validated with the observed data and showed good agreement with experimental values. The influence of the area of the product to be dried, airflow rate and collector area, on moisture content changes, air temperature and humidity inside the greenhouse was studied. For the case study of this SGDS, the results obtained from simulation showed that the optimum values of area of the product to be dried, the exhaust airflow rate and the collector area were found to be 40 m², 250 kg/h and 2 m², respectively.