太阳能烟囱强化自然通风与蒸发冷却复合系统的分析

介绍了太阳能烟囱强化自然通风的工作原理及其研究现状,并针对干燥地区夏季炎热气候,提出一套太阳能烟囱与蒸发冷却复合通风系统。分析表明,该系统可合理利用太阳能解决室内通风降温问题,与传统通风空调系统相比,大大节省了投资和运行费用,节能环保效果显著。     

浅谈太阳能-空气双热源热泵中央热水系统

本文针对新提出的一项技术一太阳能一空气双热源热泵中央热水系统进行了介绍,这项技术是在原有的太阳能技术的基础上研究出来的热水和热泵复合系统。该系统的主要热能是来自太阳能直射以及在空气中储存的太阳能,以较少的电能进行辅助驱动双热源热泵。该系统能够在任何气候环境下,经济的、节能的、全方位的满足人类对热水的需求。     

喷射制冷在太阳能液体除湿系统中的应用

介绍一套以太阳能液体除湿制冷为主，太阳能喷射制冷为辅的全新风空调系统，描述系统原理及流程；建立液体除湿一喷射冷却的空调实验装置；分析比较喷射制冷应用于除湿制冷中不同部位的性能及可行性；在兼顾系统效率的同时解决送风温度偏高问题；针对上海地区的气候特点，对该系统做了实验研究，在热源温度为75℃时，送风温度为19℃时，总系统COP可达0．7。     

太阳能采暖设计探讨

概括太阳能利用现状,结合项目实例,介绍了某佛学院主动式太阳能采暖结合被动式太阳房系统的设计,对太阳能采暖系统设计中存在的问题进行探讨。     

太阳能-地源热泵复合系统的实验研究

地源热泵是利用可再生能源地热能的一种高效热泵系统,是未来发展的趋势。但在我国北方地区,大部分以热负荷为主,冬季地下埋管的取热量高于夏季的释热量,长期运行会破坏土壤温度场。介绍了太阳能-地源热泵复合系统,通过实验验证了太阳能辅助系统能够有效恢复土壤温度,提高系统性能系数,可以实现热泵长期稳定的运行。     

太阳能喷射-电压缩复合制冷系统中增压器的选型及性能预测

本文预测了在建太阳能制冷实验台的性能及影响太阳能喷射系统的因素,并且对太阳能喷射．电压缩复合制冷系统中增压器的选型做了分析,认为采用变频压缩机作为复合系统的增压器可使系统效能更优。     

蓄热型空气式太阳能集热空气源热泵复合供暖系统的应用研究

在气候寒冷的地区,供暖系统的重要性不言而喻,在寒冷地区搭建蓄热型空气式太阳能集热空气源热泵复合供暖系统,能够满足当地的热水使用需求和用户用暖需求.蓄热型空气式太阳能集热空气源热泵复合供暖系统受到建筑负荷变化以及气候条件等多重因素影响,在应用的过程中需要呈现出多种不同的运行模式,为了保证蓄热型空气式太阳能集热空气源热泵复...     

太阳能与常规能源复合空调/热泵系统在别墅建筑中的应用研究

为实现太阳能在绿色节能建筑中的应用，根据别墅建筑特点，结合溴化锂吸收式制冷／热泵系统的特点，提出太阳能与常规能源复合的空调／热泵系统。系统内采用了潜能储存和常规莆能综合技术，提高了系统的蓄能密度，并解决了吸收式热泵系统运行必须有16℃以上热源的问题。系统可为别墅建筑提供夏季空调，冬季采暖以及全年的卫生用水。建立了太阳能综合系统运行特性分析的计算模型，并以北京、西安、兰州三处太阳能较为丰富的地区为例，结合气候条件对系统运行特性进行了计算分析，给出了系统内能量分配与平衡的关系，并对系统运行作了简要的经济性评价。     

太阳能光伏-光热复合发电技术及其商业化应用

由于太阳能自身的间歇性和不稳定性,提高太阳能发电并网的质量成为近年来的研究热点。太阳能光伏-光热（photovoltaic/concentrated solar power,PV-CSP）复合发电技术作为一种新兴技术,相比于单独的太阳能光伏（PV）和太阳能热（CSP）发电技术具有诸多优势,目前已有多种技术形式实现了商业化。介绍了PV、CSP发电技术及PV-CSP复合发电技术,通过一些典型商业化PV-CSP复合电站的建设及运行情况,分析了当今商业化PV-CSP复合电站的应用现状,并综述了近年来对PV-CSP复合发电系统的技术和经济性研究情况。     

热电技术在绿色建筑的应用研究

近年来,绿色建筑吸引了人们越来越多的注意,绿色建筑也成为未来建筑设计的方向。本文提出一种新型太阳能热电辐射空调系统,并在中国5个典型城市的气候条件下,研究了系统的运行性能、发电量和能耗,分析了系统在绿色建筑应用的可行性。研究提供了一种热电技术在绿色建筑中应用的新思路,对太阳能热电辐射空调系统在不同气候地区的实际应用具有一定的指导意义。     

Indoor temperature variations resulting from solar desiccant cooling in a building without thermal backup

The performance of a once-through solar desiccant cooling system, for air-conditioning a commercial office space, was modelled using the TRNSYS computer simulation software package. The study particularly focused on the potential for designing and operating a desiccant cooling system, without any thermal backup provided to mitigate for intermittent solar availability in three Australian cities.Increasing (i) indirect evaporative cooler effectiveness, (ii) air flow to the office space, and (iii) solar collector area were all shown to reduce the frequency of high temperature events inside the building occupied space. In the warm temperate climate of Melbourne (and to a lesser extent Sydney), high ventilation rates enabled comfort conditions to be maintained at or near acceptable levels in the occupied space, without the use of a backup thermal source.The synergy between evaporative cooling and solar desiccant cooling, observed in the warm temperate climates, was not evident in the tropical Darwin climate, suggesting that the selected ventilation desiccant cooling cycle is not appropriate for tropical climates.     

Modelling and simulation results for a domestic exhaust-air heat pump heating system

Energy consumption in residential buildings has gained an increasing interest the latest years due to the rising demand for efficient energy use and higher comfort standards. In tight building constructions with controlled ventilation, heat recovery with exhaust-air heat pump connected to floor heating is regarded as energy efficient heating system that optimises the energy use in buildings while maintaining an acceptable level of thermal comfort. In this study, we use the computational tools TRNSYS and EES to model and analyse the performance of a residential house, its ventilation system and its floor heating system based on an exhaust air heat pump. The system analysis focuses particularly on the influence of internal and solar gains on the operation of the heating system and the thermal comfort of the house. Furthermore, the way that gains influences the performance of the floor heating system is examined. Overall, the results bring to light the impact of factors that are not easy to predict on the indoor climate and the thermal comfort.     

太阳能烟囱+TROMBE墙复合结构的性能研究

将太阳能烟囱和TROMBE墙这两种太阳能强化自然通风方式相结合,提出两者串联的复合太阳能利用结构。利用传热学理论,采用能量平衡法对其建立了数学模型,并就其结构尺寸与室外气象参数对其通风性能的影响进行了计算和比较,结果表明:采用"太阳能烟囱+TROMBE墙复合结构"来强化高温高湿地区室内的通风是完全可行的;其性能受结构参数与室外气象条件影响很大,墙面宽度与高度及太阳辐射强度与室外气温的增加均有助于改善复合结构的性能,但空气夹层厚度的盲目增大会降低其通风性能,10cm可以达到较好的运行效果;其倾角可根据具体情况控制在30°～60°。研究结果对太阳能烟囱+TROMBE墙复合结构的实际应用具有重要的指导意义。     

太阳能空气集热耦合地板蓄热系统热特性实验研究

提出了一种适用于被动式太阳能空气供暖的混凝土地板蓄热系统,并对该蓄热系统在寒冷地区农村住宅中的应用进行了热特性及其影响因素实验研究。讨论了该蓄热系统对室内热环境的作用,不同集热器朝向、热气流湿度及供风速度作用下地板蓄热系统的蓄放热特性。实验结果表明,太阳能空气集热耦合混凝土地板蓄热系统充分利用建筑本体结构蓄热,有效提高了太阳能供暖房间的室内温度及其稳定性。     

一种直膨式多功能太阳能热泵系统经济性分析

本文以100m2的住宅用户为研究对象,提出一种直膨式多功能太阳能热泵系统,该系统可以实现夏季制冷、冬季制热、全年提供生活热水,并且随太阳辐射强度的不同可以实现变容量调节。对直膨式多功能太阳能热泵系统的初投资、年能耗、寿命周期内的总投资等指标进行分析,与普通空调和电热水器、普通空调和燃气热水器、普通空调和空气源热泵热水器进行比较,并分析了使用年限、日太阳能供热小时数及日生活热水用量等因素对系统经济性的影响。此外,还对此系统的变容量运行进行了总体性的经济性分析。     

Comparison between two absorption cooling systems of the ‘open’ type under different climatic conditions

Solar cooling is achieved by traditional absorption devices: these devices are rather expensive and require double glazed or selective solar collectors.Absorption systems of the open type promise to be more economic. Two possibilities are taken into account: Baum's system, and the deh umidification-humidification system. The two methods differ appreciably from each other, but the regeneration is similar for both.The required dimensions of the regenerator are compared for different climates both in Baum's case and for the most suitable dehumidification-humidification system. A comparison is also carried out as regards water consumption. The dehumdification-humidification system is shown to be cheaper to install and operate in hot climates, but the Baum system is more flexible.     

A solar source heat pump with refrigerant-cooled solar collectors for cold climates

A heating system best suited to the local requirements and resources of Quebec, Canada, was developed. Solar source heat pump systems with solar collectors cooled directly with R 12 appear to be a promising means of utilizing solar energy in cold climates. The solar collectors may be operated at evaporation temperatures lower than their ambient temperature, and performance improved by cooling it with an evaporative refrigerant, rather than a single phase fluid.     

Technical and economical assessment of energy-saving roof and wall construction in Thailand

This research assessed the economic impact and construction costs of buildings with solar chimneys in Thailand, called bioclimatic houses. A solar chimney uses a combination of air gaps between walls and roof, and effective ventilation to lower the indoor temperature and reduce the need for air conditioning. The study looked at small, medium, and large size houses and studied construction techniques, the materials used, and the time needed to build a residential structure. It also polled owners of bioclimatic houses about their satisfaction. The techniques employed in building bioclimatic houses take slightly longer and cost slightly more than those used in standard construction. However, the study found that bioclimatic houses use approximately 10–20% less electricity for air conditioning require less maintenance and have a payback period of 6–13 years, depending on the size. The lifespan of insulation material used in standard houses is about 20–25 years, while the lifespan of a solar chimney is about 40–50 years. The solar chimney concept can also be applied to standard houses with minimal renovation. The study found that this type of house was suitable for use in Thailand, and with increased consumer awareness, had a high probability for adoption.     

Comparison between two absorption cooling systems of the ‘open’ type under different climatic conditionsComparaison des systémes frigorifiques à absorption du type ‘ouvert’ dans différentes conditions climatiques

Solar cooling is achieved by traditional absorption devices: these devices are rather expensive and require double glazed or selective solar collectors.Absorption systems of the open type promise to be more economic. Two possibilities are taken into account: Baum's system, and the deh umidification-humidification system. The two methods differ appreciably from each other, but the regeneration is similar for both.The required dimensions of the regenerator are compared for different climates both in Baum's case and for the most suitable dehumidification-humidification system. A comparison is also carried out as regards water consumption. The dehumdification-humidification system is shown to be cheaper to install and operate in hot climates, but the Baum system is more flexible.     

Low-temperature solar-plate-assisted heat pump: A developed design for domestic applications in cold climate

Solar energy and wasted heat in buildings are capable of supplying enough energy to answer the total demand of energy in dwellings. However, fluctuation in fuel prices and gas emissions are the main driving forces behind efforts. In this experimental study, a direct expansion solar-assisted heat pump system (DX-SAHP) using a bare ternary “retrofitted collectors with black paint” is investigated at the laboratory with a solar simulator and tested for domestic hot water (DHW) and space heating under quasi-static conditions. Unglazed solar collector absorber plates are used as an evaporator, and these are composed of two aluminium plates which are placed externally whilst another plate is mounted internally in the loft space of the house, where operating liquid from the heat pump is directly evaporated. The influence of outside temperature, solar irradiation and/or waste heat on the heating performance of DX-SAHP is investigated. The impact of the parameters such as the inlet temperature and the mass flow rate of the heat transfer fluid is also assessed. Preliminary results elucidate that the refrigeration cycle can be a promising substitute for space heating and hot water when compared to the heat pump systems. This design technique results in higher solar collector/evaporator efficiency and lower system losses due to low evaporating temperature.