共查询到20条相似文献,搜索用时 78 毫秒
1.
吸附除湿制冷空调系统的研究现状及发展趋势 总被引:2,自引:0,他引:2
本文主要从吸附除湿制冷循环产生的背景、循环的工作原理、研究现状及其发展趋势对吸附除湿制冷进行了一些综合和分析。由于吸附除湿制冷空调在能源利用、环境上是传统压缩式空调无可比拟的,所以其发展前景很可观。 相似文献
2.
根据固体吸附式制冷原理,利用太阳光作为热源,对一种新型太阳能冷管的制冷性能进行试验研究。该冷管冷凝器采用薄壁不锈钢材料,利用沸石分子筛—水作为吸附工质对。实验结果表明:在太阳辐射强度为21.01~22.90MJ/m2,室外环境温度最高为31℃时,该太阳能冷管的单支制冷量大约为145k J,制冷温度为11℃,制冷系数约为0.118。 相似文献
3.
船用喷射制冷机组可以有效利用船舶上低品位热能,实现能源的节约和高效利用。简述了喷射制冷的原理,进行了热力学分析,对船用蒸汽喷射制冷机组及余热回收式喷射制冷机组的研究及发展现状进行了分析,并对太阳能等新型喷射制冷机组船用化进行了展望。 相似文献
4.
建立了以水为热交换媒介的太阳能光伏半导体制冷模块实验系统.制冷装置模块化,用以适应制冷功率变化较大的不同空间布局,通过太阳能光电半导体制冷实验获得了不同工作状态下电流、制冷量、制冷系数等重要参数,该参数可为确定系统最佳工作区域提供可靠依据.给出了太阳能热电制冷系统组合方案,介绍了一种新型组合式半导体制冷器和半导体热电发电装置,其数值计算的结构参数、最大制冷系数和制冷率等重要参数以及热电器件最佳工作区域和结构参数的最优范围,可为系统优化设计的配置提供理论上的指导. 相似文献
5.
本文对以氯化锂为吸湿剂的吸附除湿空调系统进行了实验研究,实验结果表明该空调系统再生空气的最佳温度为90℃;空调工况下制冷系数COP在41~51%之间;如果再生空气温度低于80℃,则COP低于20%.并且还讨论了该空调系统各个操作参数之间的相互关系.本文取得的实验数据为吸附除湿空调系统的进一步完善提供了可靠依据. 相似文献
6.
7.
8.
9.
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。 相似文献
10.
11.
H-M. Henning T. Erpenbeck C. Hindenburg I. S. Santamaria 《International Journal of Refrigeration》2001,24(3)
The use of heat produced by solar thermal collectors is an interesting option for thermal driven air conditioning processes. A thermal driven cooling technique which fits well to non-tracking solar collectors is the desiccant cooling technique. Recently several projects have been carried out which focus on the connection of desiccant cooling systems with solar thermal energy for regeneration of the sorbents. This communication deals with three main topics: (1) experiences achieved in a realized system which is coupled to a solar collector are discussed, (2) a new concept is presented, in which a solar air collector is integrated into the desiccant cooling cycle as the only heat source and (3) a comparative study is presented which compares system performance for different system configurations and different climatic situations. 相似文献
12.
M. Goldsworthy 《International Journal of Refrigeration》2011,34(1):148-158
Solar desiccant-based air-conditioning has the potential to significantly reduce cost and/or greenhouse gas emissions associated with cooling of buildings. Parasitic energy consumption for the operation of supply fans has been identified as a major hindrance to achieving these savings. The cooling performance is governed by the trade-off between supplying larger flow-rates of cool air or lower flow-rates of cold air. The performance of a combined solid desiccant-indirect evaporative cooler system is analysed by solving the heat and mass transfer equations for both components simultaneously. Focus is placed on varying the desiccant wheel supply/regeneration and indirect cooler secondary/primary air-flow ratios. Results show that for an ambient reference condition, and 70 °C regeneration temperature, a supply/regeneration flow ratio of 0.67 and an indirect cooler secondary/primary flow ratio of 0.3 gives the best performance with COPe > 20. The proposed cooling system thus has potential to achieve substantial energy and greenhouse gas emission savings. 相似文献
13.
太阳能/余热固体除湿冷却系统研究 总被引:1,自引:0,他引:1
提出并研制一种太阳能/余热驱动除湿冷却系统。系统包括2台内冷却紧凑式固体除湿器、热交换器、蒸发冷却器等部件。在不同工况下对系统的性能进行模拟计算,分析再生温度、热交换器效率及蒸发冷却器效率对系统性能的影响。 相似文献
14.
This study systematically analyzes the effect of various kinds of design parameters on the performance of a desiccant cooling system under two different system configurations. The considered parameters include system components such as the sensible heat exchanger, regenerative evaporative cooler and desiccant wheel, as well as operating conditions of outdoor conditions, regenerative temperature and rate of outdoor influx. Numerical simulation has been conducted for these 11 design parameters with 3 levels. The orthogonal array L27(313) is adopted for the analysis of variance. In the range of the parameters considered, the regenerative temperature is found to be the most dominant parameter of contribution ratio of 31.9% and 23.9% for each system configuration. In the case of confined interest of the applications such as a district cooling system or a solar system using medium-temperature collectors, the cooling performance of the regenerative evaporative cooler is the most crucial for the system performance. 相似文献
15.
Summer air conditioning represents a growing market in buildings worldwide, with a significant growth rate observed in European commercial and residential buildings. Available heat driven cooling technologies can be used in combination with solar thermal collectors to reduce the load caused by air conditioning on the electric utilities and to reduce the environmental impact. This work reports a performance analysis of an open cycle solar cooling plant. The plant, installed in Northern Italy, is based on a liquid desiccant evaporative cooler coupled with a solar field. Experimental tests run during summer show average primary energy ratio and primary energy saving index of about 1.6 and 30%, respectively. Though this performance is satisfactorily, the regeneration unit always operated near the lower bound of the nominal temperature range. Therefore, optimization of the solar system design could lead to higher performance. 相似文献
16.
17.
In warm countries, such as Italy and Spain, the increasing demand for space conditioning cannot be met by the current capacity of installed electric power. This has led to a growing interest in cooling with natural gas. An interesting thermal cooling system uses open-cycle absorption. It treats the air directly without heat exchangers and with very low temperature drops. With absorption dehumidification it is possible not only to obtain a cooling system similar in performance to conventional thermal cooling systems, but also, with few modifications, a high-performance heating system fed by a natural gas burner, which combines simplicity with PER typical of a gas driven heat pump. The proposed new system described in the paper is studied both in winter and summer mode, evaluating the influence of the different parameters. 相似文献
18.
Jiazhen LingOsamu Kuwabara Yunho Hwang Reinhard Radermacher 《International Journal of Refrigeration》2011,34(4):946-957
CO2 and R410A desiccant wheel (DW)-assisted separate sensible and latent cooling (SSLC) air-conditioning systems were tested under the AHRI standard. At a 50 °C regeneration temperature, the coefficient of performance (COP) of the vapor compression cycles improved only 7% from the respective baseline systems for both refrigerants. This paper proposed the idea of applying divided condensers (or gas coolers) to the R410A (or CO2) SSLC system to enhance its performance. It was found that the application of divided heat exchangers to the SSLC system provided sufficiently hot airflow for regenerating the desiccant wheel at both a reduced high side pressure (from 10.4 MPa to 9.7 MPa for CO2, from 3.46 MPa to 3.45 MPa for R410A) and a reduced discharge temperature from the condenser (gas cooler) (4 K lower for both refrigerants). The COP improvement is 36% and 61% to R410A and CO2 baseline systems, respectively. 相似文献
19.
从目前循环冷却水系统中普遍存在的结垢问题入手,引出臭氧水处理法,它是一种环保、安全、高效的水处理方法。臭氧在处理循环冷却水时能起到杀菌、缓蚀、阻垢及脱垢的作用。简要阐述臭氧处理循环冷却水的阻垢及脱垢原理,分析污垢对冷水机组性能的影响。臭氧处理冷水机组循环冷却水的试验表明,臭氧水处理方法能够显著提高冷水机组的COP。 相似文献
20.
为研究用于数据中心的动力型热管系统性能,本文在焓差法实验室对三类压缩机性能进行了实验研究,结果表明:1)带气泵功能的压缩机具备低压缩比运行能力,可根据室外环境温度以及室内负荷不同分别切换不同工作模式,简化系统配置,具有很好节能效益,其中变频转子压缩机COP可以超过20,变频涡旋压缩机COP接近20,可以较好的替代液泵; 2)中小型机房空调领域,综合利用气相动力型热管与压缩制冷技术,拓宽了自然冷却利用时间,全年能效比AEER远高于常规机房空调,配合运用地域性风冷、水冷、蒸发冷等节能方式,为现代数据中心节能减排提供了新的思路; 3)大型数据中心空调领域,磁悬浮压缩机COP超过20,具有较高的节能效益,但与液泵相比仍具有一定差距,同时离心式压缩机作为气泵运用存在循环不畅的现象,需要液泵进行压头补偿。 相似文献