小型热电联产系统能耗分析

针对部分地区小型热电联产系统运行不合理、冷源损失大、节能效果不理想的问题,通过对某小型热电联产系统全年运行状况的调查,计算了热电机组的发电效率、热效率及汽机冷源能量损失,分析了小型热电联产系统能耗大的主要原因,提出了提高热电联产系统能源利用效率、改进热电联产集中供热形式的措施,为热电联产系统改造和扩建工作提供参考。     

小型热电联产系统的热效率分析

以装机容量为12MW的某背压式供热机组为例,分冬季和夏季两种工况对小型蒸汽热电联产系统各部分的热效率以及各设备的性能参数进行了分析,得出了热负荷变化对热电联产热效率的影响关系,提出在全年热负荷变化较大的情况下,小型热电机组热效率不高,系统全年节能效果不理想。     

发展小型热电联产的障碍及提高效益的途径

小型热电联产具有节能的优越性,但目前发展较慢。本文根据实际调查,分析了发展小型热电联产存在的一些主要问题,提出了为局长小型热电联产的一些建设性意见     

热电联产系统供热比计算办法的探讨

通过对供热比分析计算来进行合理的热电分摊，克服传统的计算缺点；通过对热量法进行修正，将冷源损失合理地分配给供热、发电，以期正确确定供热、供电价格，调动热电双方的积极性。     

新模式热电联产供热系统用热终端高效换热器的分析

首次为新模式热电联产低品位供热系统提出了一种用户端高效换热器－新型风机盘管,并对此从技术性、节能发生和经济性等方面进行了探讨和分析,旨在为新模式热电联产供热工程的实施提供理论依据。     

黑龙江省供热及热电联产现状综述

通过对黑龙江省目前供热及热电联产现状进行全面调查分析，揭示了省内目前各地区热负荷基本情况、热源厂及热网的发展状态。     

建筑物小型热电联产在欧洲的发展

本文首先介绍了建筑物小型热电联产的特点及其在一些欧洲国家的发展与应用情况。然后指出了小型热电联产对环境污染的改善推广过程中应采取的措施，最后分析了小型热电联产的技术发展特点。     

发展小型分散热电联产的研究与探讨

介绍了小型分散热电联产的特点、主要型式，分析了小型分散热电联产的成因，还介绍了国内外发展简况，并提出了我国发展小型分散热电联产的几点建议。     

医院空调冷热源系统能耗及经济性分析

医院建筑是进行疾病诊断及治疗活动的场所,人员集中性较大且包含一些特殊功能区域。因此,医院建筑对空调系统的要求比一般办公性建筑高,其必须对整个医院提供稳定可靠的能源供应,保证医院正常医疗活动。目前,我国医院建筑的空调能耗能占整个建筑能耗的50%以上,空调节能势在必行。面对新一轮大规模医院建设,需要在设计之初就考虑空调系统节能策略,尤其在空调冷热源的选择时不仅要满足实际需求,同时还需要符合国家节能减排低碳的生态文明原则。以江苏地区某一新建医院为例,针对2种冷热源选型方案,从投资、运行能耗及费用进行了经济性比较分析,得到了适合该医院的最佳方案,对以后此类项目的设计施工提供一定借鉴意义。     

Energy consumption in greenhouses and selection of an optimized heating system with minimum energy consumption

In this paper, heat loss is precisely computed by a proposed code considering different climates. Estimating the costs of different central heating system, unit heaters were selected as the most feasible system. Finally, considering the heating capacity and unit heater's dimensions a computational fluid dynamics model was developed to find the optimized configuration of unit heaters in a typical greenhouse. Using this model, the required thermal load for a greenhouse based on the daily temperature of Arak city in 2017 was computed with a smart control system. It was found that savings in energy consumption were approximately 5447 m³ of natural gas each year.     

300MW机组集中供生活热水改造的技术经济性分析

以某300MW亚临界燃煤供热机组为基础,结合已有吸收式热泵供热改造,进行集中制取70℃和80℃热水的技术方案分析。详细分析了系统在非采暖期、采暖初末寒期和高寒期时不同的技术经济和项目节能效益,得出结论:项目拓宽了热力市场,使得吸收式热泵在非采暖季也能投入运行,增加了电厂发电量。同时,制取70℃热水的项目净收益大于80℃的收益,投资回收期也较短。在用户热水需求4000t/d的情况下,制取70℃生活热水可实现节煤1.28万t,制取80℃生活热水累计可节煤1.51万t,项目具有较好的节能减排效果。     

汽液两相流喷射升压加热器供暖系统特性研究

研究了采用汽液两相流喷射升压加热器的供暖系统的水力特性 ,得到了供回水压力越高、循环水流量越大这一与常规水泵系统完全不同的特性。设计和建立了采用汽液两相流喷射升压加热器的供暖系统并进行了工业性试验。运行试验结果表明该系统运行稳定、可靠 ,可完全满足供暖需要     

Theoretical analysis of the optimal configuration of co-generation systems and competitiveness of heating/cooling technologies

This study aims at exploiting optimal configurations of technologies combined with co-generation theoretically based on a linear optimization model. With the objective function defining primary energy consumption to be minimized, optimal solutions are derived analytically. They describe the technological configurations as well as associated conditions depending on their final energy demand. An interesting finding is that the essential parameters to determine the configurations are heat, cooling and steam demands normalized by power demand. The optimal solutions are also applied to investigate the competitiveness of co-generation related technologies. The optimal solutions yield critical conditions theoretically, which is useful to understand the priority of the technologies. A sensitivity analysis numerically indicates that absorption chillers can be superior to compression chillers even though the former has lower COP than the latter. Actual data of various types of co-generation are also examined to show the practical competitiveness.     

蒸汽供热管网运行工况的水力计算与分析

以节点连续方程为基础对蒸汽供热管网运行工况进行了水力模拟计算,编制了3个枝状蒸汽供热管网的水力工况模拟计算软件,对某现有蒸汽供热管网的实际运行工况进行了计算与分析,给出了经济运行工况,并在对蒸汽供热管网实际运行进行预测的同时指出了蒸汽供热管网节能改造的方向。程序具有可再植入性,能够适应因管网改造导致的数据库中管段信息的更改。     

某企业锅炉系统能耗的诊断和分析

采集锅炉系统运行中能源利用信息数据,计算分析各种能耗数据,查找企业在热能利用方面的节能潜力。     

Energy and exergy analysis of the Gonen geothermal district heating system,Turkey

This paper describes a performance evaluation of the Gonen geothermal district heating system (GGDHS) in Balikesir, Turkey, based on energy and exergy analyses. The exergy destructions in the overall GGDHS are quantified and illustrated using energy and exergy flow diagrams for a reference temperature of 6 °C. The results indicate that the exergy destructions in the system occur primarily as a result of losses in the pumps, heat exchangers, and pipelines, as well as losses associated with cooled geothermal waters injected back into the reservoir. These losses amount to 14.81%, 7.11%, 1.06%, and 12.96% of the total exergy input to the GGDHS, respectively. Both energy and exergy efficiencies of the overall GGDHS were investigated to analyze and improve system performance. The efficiencies were determined to be 45.91% and 64.06%, respectively.     

Energy consumption analysis on a dedicated outdoor air system with rotary desiccant wheel

A dedicated outdoor air system (DOAS) with rotary desiccant wheel is the combination of a desiccant dehumidification system and a vapor compression refrigeration system. An energy consumption model of this hybrid DOAS is established for its analysis. Coefficient of performance, COP, is appropriately defined for evaluation on performance of the hybrid DOAS. The results indicate that, compared with a conventional DOAS, energy savings are possible for the suggested DOAS, when solar energy or natural gas is used for regeneration. Ventilation air flow rate, temperature or humidity of outdoor air, as well as regeneration-to-process air ratio, influence the energy consumption and the COP of the hybrid DOAS, greatly.