中央空调系统节能改造实践

结合现有建筑的中央空调系统的运行状况及空调区环境参数指标要求,对其进行节能改造。通过自动控制各机组设备优化运行及根据建筑负荷变化特性对系统实施动态调节,提高了能源利用效率,降低了空调系统运行能耗。该方案将中央空调系统节能技术与互联网技术结合,提高了系统管理效率,为既有设备的节能改造提供思路与参考。     

广东某智能化酒店中央空调系统的节能改造

本文介绍了广东某智能化酒店中央空调系统的改造节能和管理节能的经验,提出了中央空调系统节电率和节能量的计算方法。     

智能模糊控制技术在航站楼中央空调系统中的应用

航站楼中央空调系统具有巨大的节能潜力,采用传统、常规的PID控制有其局限性,难以获得较好的节能效果.因此,现代、先进的智能模糊控制模式应运而生,为提高中央空调系统的能源利用效率,节能减排,提供了一项科学、可行的技术措施.经部分机场航站楼空调系统的应用实例验证,采用此项技术后,空调系统节能效果显著.     

模糊控制技术在中央空调水系统变流量运行中的应用

中央空调以消耗电能为动力,在为人们提供舒适的工作环境和生活环境的同时也消耗了大量的能量。通常中央空调耗电量占整个单位用电量的60％以上,所以对中央空调进行节能设计与节能改造是十分重要的。本文主要介绍了模糊控制技术在中央空调水系统变流量运行的原理及在具体项目中的应用。     

中央空调节能管理系统的设计与实现

在中央空调管理系统的发展背景和相关技术基础上,逐步对中央空调管理系统的现状进行了分析,提出了基于BACnet/web services技术的中央空调节能管理系统CAC-IEnet.这个系统可以实现对中央空调系统内温度、湿度、压力、流量、电力参量的实时监控,并自动采取节能策略对空调系统进行管理,同时,管理人员可以通过web服务实时掌握中央空调系统的运行以及环境情况.本系统的总体目标是构建一个可扩展性强、开放性好的系统平台,通过该平台可以实现中央空调设备之间的互联、互动和信息共事,实现中央空调与外界的信息交换.文章首先介绍了中央空调管理系统在国内外发展现状,结合了BACnet的特点,提出了系统开发的基本设计原则和开发方法.设计和开发基于BACnet的中央空调管理系统,不仅具有很强的现实意义,也具有广泛的市场前景.     

HBS系统的节能管理

本文以利达公司HBS系统为例,说明其节能管理。节能是HBS系统最重要的控制目标和功能。各类公共建筑能耗分析中(本刊2006年第6期第26页),中央空调系统和照明系统能耗占建筑能耗的绝大部分,所以中央空调系统和照明系统是HBS系统节能的重点。要实现中央空调系统的节能,首先应设计合理,从2005年7月1日开始实施的《公共建筑节能设计标准》为各类公共建筑的节能设计提供了完善合理的节能设计标准。从该标准中可以发现,空调系统的节能设计可以分为两方面,一方面是减少空调建筑的热负荷的节能设计,另一方面是提高中央空调系统运行效率的节能标准…     

商务写字楼中央空调系统计费方式调研分析

通过对商务写字楼中央空调系统计费方式使用情况调研,分析中央空调用户和运行单位对计费方式的满意度,指出中央空调系统计费方式可以有效改善系统使用者的用能习惯,提升用户的节能意识。     

做仪表行业的“格力”———对话广州柏诚智能科技有限公司总经理 谭文胜

如今,节能理念成为热门话题,越来越多的企业投入节能事业中,空调为人们消暑取暖提供舒适环境的同时,如何实现节能,那么中央空调的温控系统就必不可少。中央空调的温控系统可以控制、调节温度,从而实现节能。温控系统、冷量表作为中央空调中     

集中空调系统控制策略

结合中央空调系统受多种因素干扰,控制参数多,各个环节之间互相耦合,控制过程时间滞后大等特点,从中央空调机组基本参数的测量、能量调节、冷热源及水管系统的全面调节与控制等方面考虑,探讨了智能控制策略在中央空调节能控制中的应用。     

中央空调系统在某高档住宅小区的应用

介绍广州地区某高档住宅小区采用中央空调系统的分析与设计过程,指出通过合理设计,中央空调系统在住宅建筑中应用可以达到节能、美观、舒适等效果,具有广阔的应用前景。     

HVAC system strategies for energy conservation in commercial buildings in Saudi Arabia

In recent years, there has been a dramatic increase in energy consumption in Saudi Arabia. The building sector being the largest consumer of electric energy represents a major potential contributor for reducing energy consumption. Due to their functional and operational characteristics, commercial buildings relatively consume more energy (per unit area) than other types of buildings. The heating, ventilating and air-conditioning system (HVAC) is one of the largest end-users of energy in these buildings, particularly in harsh climates. Energy efficient design and operation of HVAC systems in commercial buildings can offer major opportunities for reduced energy consumption and contribute to sustainable development. However, improper utilization of energy conservation measures can result in reduced environmental quality. This in turn exposes the occupants to thermal discomfort and health risks, and consequently diminishes the economic value of the facility. Therefore, a well assessed and balanced energy conservation strategy is required to achieve energy efficiency while maintaining desired level of thermal comfort. In this study, major design and operational parameters for different types of HVAC systems influencing energy consumption are investigated utilizing the Visual-DOE program. Results indicate that energy savings of up to 30% can be obtained while maintaining acceptable level of thermal comfort when HVAC systems are properly selected and operated.     

大型公共建筑中央空调能耗优化控制系统的方案应用与节能测试

本文针对舟山市岱山县行政中心的中央空调运行状况,根据业主提出的设备节能与高可靠性运行等需求定制解决方案,通过能耗优化控制系统提高中央空调的整体运行效率,在节能对比测试中证明了预定的节能目标,最后就此系统的应用和节能测试进行了总结,希望有利于推动大型公共建筑中央空调的节能改造业务发展。     

全热换热器应用于空调系统节能的研究进展

空调系统的大量使用导致了空调能耗所占社会总能耗的比重越来越大。因此，降低空调系统的能耗对降低建筑物耗能、节约能源有重要意义。全热交换器是一种可以降低空调负荷、节约系统能耗、提高系统效率的高效节能产品。它有效地解决了改善室内空气品质与空调节能之间的矛盾，在空调系统节能领域中是不可替代的。     

全热换热器应用于空调系统节能的研究进展

空调系统的大量使用导致了空调能耗所占社会总能耗的比重越来越大。因此,降低空调系统的能耗对降低建筑物耗能、节约能源有重要意义。全热交换器是一种可以降低空调负荷、节约系统能耗、提高系统效率的高效节能产品。它有效地解决了改善室内空气品质与空调节能之间的矛盾,在空调系统节能领域中是不可替代的。     

Predictions of energy savings in HVAC systems by lumped models

An approach to optimizing the energy efficiency of a Heating, Ventilating, and Air Conditioning (HVAC) system is presented that utilizes computational predictions of the effect of heat load distribution on moist air temperature, density, and humidity variation. Lumped-HVAC (L-HVAC) is a new lumped parameter code that couples fluid transport, energy transport, thermodynamics, and psychrometrics in an HVAC system. This code contains a nonlinear implicit solution algorithm for steady-state and transient calculations for flow resistance, water mass balance, and energy conservation. L-HVAC has been validated using a simplified analytical model, the commercial lumped parameter code SINDA/FLUINT, and experimental measurements. Steady-state calculations for a single-room system suggest an order of magnitude greater energy savings using a variable chiller power control approach compared to control damper and variable-drive fan approaches. L-HVAC was also applied to predict that the fraction of latent to total heat load influences the steady-state system temperature by up to 0.4 °C for the example system in this study.     

Influence of building parameters and HVAC systems coupling on building energy performance

The performance of different HVAC systems varies when coupled with different buildings. This paper examines the relationship between building heating and cooling load and subsequent energy consumption with different HVAC systems. Two common HVAC systems in use throughout the UK office building stock, variable air volume (VAV) system and fan coil (FC) with dedicated outside air system, have been coupled with a typical narrow plan office building with and without daylight control and for both cellular and open plan.The results presented in this paper clearly indicate that it is not possible to form a reliable judgment about building energy performance based only on building heating and cooling loads. For the two investigated systems, variable air volume system and fan coil with dedicated outside air system, the difference between system demand and building demand varied from over −40% to almost +30% for cooling and between −20% and +15% for heating. If a heat recovery unit is used, the difference in heating performance is even greater, rising to −70%.     

暖通空调系统节能设计思考

暖通空调系统能耗是建筑能耗的主要组成部分,但以往的暖通空调设计多仅着眼于功能而忽略节能。通过多个案例分析指出了基于节能考虑的设计认识误区,提出了值得重视的若干节能设计理念,探讨了基于节能的暖通空调系统方案设计方法。     

Application of an energy management and control system to assess the potential of different control strategies in HVAC systems

The significant and continuous increment in the global electricity consumption is asking for energy saving strategies. Efficient control for heating, ventilation and air-conditioning systems (HVAC) is the most cost-effective way to minimize the use of energy in buildings. In this framework, an energy management and control system (EMCS) has been developed to schedule electricity end-uses in the campus of the Universidad Politécnica de Valencia (UPV), Spain. This paper presents an evaluation performed by using the EMCS of different control strategies for HVAC split systems. It analyzed the effect of different schedules for a common air-conditioning device and demand response strategies are tested in several situations. The economic saving is calculated taking into account the electricity contract clauses. Finally, a test is made for the control of a group of similar devices in order to reduce the maximum peak power in consumption and to obtain a flexible load shape with the HVAC loads. The studies are then extrapolated to a larger system, the whole University campus, for which energy and economic savings are quantified.     

Application of optimization techniques on lumped HVAC models for energy conservation

Heating, ventilating, and air conditioning (HVAC) systems comprise nearly one third of annual household energy consumption in the United States. HVAC energy use can be reduced by applying controls. This study applies a novel control method on a system with arbitrary steady-state and transient load distributions. The new method uses multi-dimensional interpolation between optimized control configurations for various steady-state load distributions. Demonstration of the new method on a two-room HVAC system predicts power savings for an arbitrary steady load that is nearly equivalent to that using a Variable-Air-Volume (VAV) with chiller modulation. However, the new method provides better energy savings for arbitrary transient loads: 19% energy savings over an uncontrolled system compared to energy savings of 6% for a VAV with chiller modulation. The average transient temperature deviation from setpoint using the new method is slightly better than that using VAV with chiller modulation.     

住宅建筑暖通空调系统设计探究

本文就在设计工作中暖通空调系统在居住建筑节能设计中的存在的问题、建筑专业对暖通系统的影响等方面进行了分析,对提高居住建筑暖通空调系统的节能运行效率、加大在此类建筑中暖通系统节能技术的应用提出了相关建议。