三用型水源热泵系统的设计实例

旅馆、酒店和会所,夏季需要制冷,冬季需要供热,全年需要生活热水,采用水源热泵系统,对部分机组的冷凝温度加以调整,该系统一机三用,夏季制冷、冬季取暖,一年四季制备生活热水,夏季制冷的同时制备生活热水,即免费制备热水,该系统比常规水源热泵系统更加节能;以大连长兴岛高尔夫球场会所空调、采暖、生活热水三用型水源热泵系统为例,根据空调、采暖、生活热水负荷,配备了三台水源热泵机组,分析了空调、采暖、生活热水三用型水源热泵工作原理;夏季空调制冷,制备生活热水,COP值达到5.72,过渡季制备生活热水、冬季空调采暖和制备生活热水的COP值达到3.75,有较大的节能效益。     

蒸汽锅炉及管路施工中若干问题的探讨

在当前民用机电安装工程、特别是在综合性大型工程中,蒸汽锅炉系统常被用于生活热水制备、采暖及工艺生产。本文从蒸汽锅炉及管路施工中的设备安装、管线阀门施工、系统压力试验等阶段,就系统的安装质量控制、安全可靠性、系统震动噪声等若干问题进行了探讨。     

浅谈低温地面热水采暖的施工技术

在当前的采暖领域中,低温地面热水采暖施工技术不仅有效的实现了节能环保,还提高了人们的生活质量,本文针对低温地面热水采暖的施工技术进行了研究和阐述。     

民用建筑热水锅炉供热系统浅析

在人类社会发展的很长一段时间中，热水在普通家庭的作用除了饮用外，主要是用作洗涤和洗浴等生活热水，产生热水的设备则是最简单的锅和炉。而在科技日益发展的当今社会，锅炉的性能和种类都有了新的发展，热水的用途也更加广泛。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。     

新一代空调采暖供热设备

新一代空调采暖供热设备ＴｈｅＭｏｄｅｒｎＷａｒｍｉｎｇＥｑｕｉｐｍｅｎｔｏｆＡｉｒ－Ｃｏｎｄｉｔｉｏｎｉｎｇ徐春菲（广州天河高新技术产业开发区工业发展总公司广东５１０６３０）中央热水机组是近年来出现在我国采暖供热系统的新一代产品。该产品作为替代热水锅...     

低温热水地板辐射采暖技术的应用与研究

在当前的社会发展中,低温热水地面辐射采暖技术已经成为诸多采暖技术中最受欢迎的一种,尤其是在高层建筑工程日益兴起的今天,其伴随着经济和社会技术的发展而呈现出进一步的发展趋势。低温热水地板辐射采暖技术的应用为居民的生活创造了舒适环保的物质基础和良好的精神需求,也为居民生活水平的提高提供了基础。本文就低温热水地板辐射采暖技术的概念和优越性进行了探讨,并阐述了其应用与施工要点。     

浅谈热水采暖系统常见的故障及处理措施

热水采暖与人们的工作、生活密切相关,但是,在系统设计、施工操作、运行等过程中由于一些自然和人为因素的原因,造成整体运行中出现一些问题,影响热水采暖的正常供热,不利于人们的正常生活。本文主要是对热水采暖系统的涵义、特点,常见的故障及处理措施进行分析论述,希望提供一些有价值的参考,从而保证热水采暖系统的正常进行。     

杭州凤起大厦电储热系统设计

介绍了杭州凤起大厦电储热采暖和生活热水系统的设计方案及特点,对工程实际运行数据进行了分析和比较,指出该系统具有经济、环保和运行可靠等优点,值得应用和推广。     

教学楼太阳能-低温热水地板辐射采暖应用价值分析

太阳能-低温热水地板辐射采暖是一种新型的采暖形式,本文系统的分析了其在教学楼应用中的优势,并用一算例对其应用的经济性做出了评价,结果表明太阳能-低温热水地板辐射采暖具有很高的经济价值,且由于不消耗一次能源,也具有极大的环保价值。     

江苏省委党校蓄热电锅炉系统设计

介绍了蓄热电锅炉采暖、生活热水系统和电蒸汽系统的设计方案和特点，并对系统实际运行费用进行分析，指出双系统单蓄热罐流程具有较多的技术上优点及较好的使用经济性。     

工业废热在地面辐射供暖中的利用

讨论了南方供暖成为业内热门话题的原因和当前南方地区实施集中供暖的难点,分析总结了当前常见供暖系统的优缺点,发现热水地面辐射供暖系统优势明显。对炼钢厂的废热特点进行了深入总结,分析结果表明炼钢厂可以作为热水地面辐射供暖系统的很好的热源。结合某实际工程,详细介绍了利用炼钢厂废热作为工厂生活辅助区地面辐射供暖系统的设计方案,并对其进行了技术经济性分析,发现该方案技术上可行、节能效果显著、经济优势明显,该设计方案充实了集中供暖的设计思路,对以后类似工程的设计具有一定的参考价值。     

Field test investigation of a double-stage coupled heat pumps heating system for cold regions

This paper reports a double-stage coupled heat pumps (DSCHP) heating system, which couples air source heat pump (ASHP) and water source heat pump (WSHP) together. The system is presented for the first time in open literature with the objective to improve the working condition and heating performance of the ASHP under cold environment. A practical project in Beijing firstly installed this system and field test has been performed for one month. The test results indicate that the DSCHP system can be smoothly and efficiently used for heating in cold regions. Compared with the traditional ASHP heating system, the operating characteristics of the DSCHP heating system are greatly improved, demonstrating that the system can offer considerable application potential in cold regions.     

空气源热泵辅助供热太阳能热水系统技术经济性分析

结合昆明地区的气候特征,分别以电加热热水系统与燃气热水系统为参照,对空气源热泵辅助供热的太阳能热水系统集中供生活热水进行技术经济性分析。研究结果表明,在昆明地区采用空气源热泵辅助供热太阳能热水系统,节能性与经济性均较显著,是适宜推广的生活热水系统形式。     

空气源热泵蒸发器并联轮换除霜理论研究

针对大中型空气源热泵系统除霜,提出一种空气源热泵蒸发器并联轮换除霜系统,该系统能够实现除霜时不停止制热。为分析系统的结霜/除霜特性,建立空气源热泵蒸发器并联轮换除霜系统理论模型。通过模拟研究蒸发器并联轮换除霜系统结霜/除霜过程中霜层和系统制热性能随运行时间的变化情况。结果表明,在环境温度-5℃,相对湿度80%时,系统运行60 min时,室外机霜层厚度已影响机组正常运行;在运行40 min时开始运行除霜,除霜周期为15.76 min,获得的最大制热量为7.94 kW,最大制热COP为2.77。     

供热空调系统效率计算方法

为了明确供热空调系统的能质利用情况,基于单耗分析理论和方法对供热空调系统的分析进行了进一步的研究和探讨。讨论了几种典型供热空调系统形式(锅炉供热、电热供热、热泵空调、吸收式冷热水机组)的效率计算方法,并总结出效率通式。为表征系统整个运行期的平均效率,提出了两种使供热空调系统的分析方法更为全面的方法(供热/冷量加权温度法和燃料加权法),并结合示例全面分析了基于热力学第一定律的一次能源利用率和基于热力学第二定律的效率,从而更为全面地了解各系统在全工况下的能源(质)利用情况。     

浅析住宅分户热计量

本文对住宅分户热计量系统的形式、计量方式、热价的制定以及应注意的问题等方面的内容进行了介绍。     

Experimental investigation on heating performance of gas-injected scroll compressor using R32, R1234yf and their 20wt%/80wt% mixture under low ambient temperature

In this paper, an integrated gas-injected scroll compressor heat pump system using R1234yf, R32 and its binary mixtures as working fluid was developed and their heating performances under low ambient temperature were quantitatively evaluated. A composite test system consisting of second-refrigerant calorimeter and water-cooled condenser was used to test the system working performance. The condensing temperature, evaporating temperature, compressor power input and other variables were analyzed to evaluate the system heating capability and energy efficiency. Test results showed that the R1234yf system can run at an evaporating temperature of −25 °C. R1234yf/R32 mixture can run at an evaporating temperature of −20 °C and it has the highest heating COP value among other refrigerants; R1234yf/R32 gas injection system provided very significant performance improvements for heating performance, compared with no gas injection, the heating capacity and heating COP can improve 16%~20% and 13%~16%, respectively.     

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.     

Residential CO2 heat pump system for combined space heating and hot water heating

A theoretical and experimental study has been carried out for a residential brine-to-water CO₂ heat pump system for combined space heating and hot water heating. A 6.5 kW prototype heat pump unit was constructed and extensively tested in order to document the performance and to study component and system behaviour over a wide range of operating conditions. The CO₂ heat pump was equipped with a unique counter-flow tripartite gas cooler for preheating of domestic hot water (DHW), low-temperature space heating and reheating of DHW.

The CO₂ heat pump was tested in three different modes: space heating only, DHW heating only and simultaneous space heating and DHW heating. The heat pump unit gave off heat to a floor heating system at supply/return temperatures of 33/28, 35/30 or 40/35 °C, and the set-point temperature for the DHW was 60, 70 or 80 °C. Most tests were carried out at an evaporation temperature of −5 °C, and the average city water temperature was 6.5 °C. The experimental results proved that a brine-to-water CO₂ heat pump system may achieve the same or higher seasonal performance factor (SPF) than the most energy efficient state-of-the-art brine-to-water heat pump systems as long as: (1) the heating demand for hot water production constitutes at least 25% of the total annual heating demand of the residence, (2) the return temperature in the space heating system is about 30 °C or lower, (3) the city water temperature is about 10 °C or lower and (4) the exergy losses in the DHW tank are small.     

空气源热泵与太阳能热水系统集成设计探讨

对不同地区应用的几种不同形式空气源热泵辅助型太阳能热水系统设计方案进行介绍探讨,并以其为基础提出一种新的空气源热泵与太阳能热水系统集成的多功能系统设计方案。总结了不同地区、不同形式空气源热泵辅助型太阳能热水系统的设计方案、特点及新集成系统运行模式等,为我国不同地区应用此类系统时选择具体设计方案提供参考。