夜间辐射复合机械制冷系统研究
摘要：为高效利用夜间辐射冷却技术，本文设计和制作了具有新型结构的夜间辐射板(NRB),提出NRB与机械制冷结合组成夜间辐射复合机械制冷系统(NRMR系统),并应用于冷却小型离网数据站房。通过实验，探究了NRB在夏季夜间的冷却潜力，并验证了NRB数学模型的准确性。建立了NRMR系统的仿真模型，分析了该系统在夏季20:00至次日06:00的动态仿真情况。实验结果表明，NRB在夏季典型日夜间的单位实验面积平均制冷量为41.5 W/m2,最大可达到60.1 W/m2,对比实验与理论制冷量，得到NRB有效冷却系数为0.77。仿真结果表明，NRMR系统理论上比传统空气源制冷系统在夏季可节省电力44.62%。
关键词：夜间辐射冷却夜间辐射板NRB)夜间辐射复合机械制冷系统实验验证TRNSYS离网数据站房
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[2] ZHANG H,SHAO S,TIAN C,et al.A review on thermosyphon and its integrated system with vapor compression for free cooling of data centers[J].Renewable and sustainable energy reviews,2018,81:789- 798.
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[4] NADJAHI C,LOUAHLIA H,LEMASSON S.A review of thermal management and innovative cooling strategies for data center[J].Sustainable computing:informatics and systems,2018,19:14- 28.
[5] SIRIWARDANA J,JAYASEKARA S,HALGAMUGE S K.Potential of air-side economizers for data center cooling:a case study for key Australian cities[J].Applied energy,2013,104:207- 219.
[6] HAM S W,PARK J S,JEONG J W.Optimum supply air temperature ranges of various air-side economizers in a modular data center[J].Applied thermal engineering,2015,77:163- 179.
[7] YAN T,LUO Y,XU T,et al.Experimental study of the coupled wall system of pipe-encapsulated PCM wall and nocturnal sky radiator for self-activated heat removal[J].Energy and buildings,2021,241:110964.
[8] CHAE D,KIM M,JUNG P H,et al.Spectrally selective inorganic-based multilayer emitter for daytime radiative cooling[J].ACS applied materials and interfaces,2020,12(7):8073- 8081.
[9] MANDAL J,FU Y,OVERVIG A C,et al.Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling[J].Science,2018,362(6412):315- 319.
[10] ZHANG S,NIU J.Cooling performance of nocturnal radiative cooling combined with microencapsulated phase change material (MPCM) slurry storage[J].Energy and buildings,2012,54:122- 130.
[11] KWAN T H,GAO D,ZHAO B,et al.Integration of radiative sky cooling to the photovoltaic and thermoelectric system for improved space cooling[J].Applied thermal engineering,2021,196:117- 230.
[12] HU M,PEI G,WANG Q,et al.Field test and preliminary analysis of a combined diurnal solar heating and nocturnal radiative cooling system[J].Applied energy,2016,179:899- 908.
[13] YI M,YANG H,QU Y,et al.A novel nocturnal cooling radiator used for supplemental heat sink of active cooling system[J].Procedia engineering,2015,121:300- 308.
[14] DIMOUDI A,ANDROUTSOPOULOS A.The cooling performance of a radiator based roof component[J].Solar energy,2006,80(8):1039- 1047.
[15] LIU Z H,TAN H W,MA G X.Experimental investigation on night sky radiant cooling performance of duct-type heat exchanger[J].International journal of ventilation,2017,16(3):255- 267.
[16] AMIR A,HOUT R V.A transient model for optimizing a hybrid nocturnal sky radiation cooling system[J].Renewable energy,2019,132:370- 380.
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Research on nocturnal radiation compound mechanical refrigeration system
Abstract: To make efficient use of the nocturnal radiation cooling technology, this paper designs and produces a nocturnal radiation board(NRB) with a new structure, and proposes that NRB and mechanical refrigeration are combined to form a nocturnal radiation compound mechanical refrigeration system(NRMR system) for cooling small off-grid data station rooms. The NRB experiment is conducted to explore the cooling potential of NRB at night in summer and to verify the accuracy of the mathematical model of NRB. The simulation model of the NRMR system is established to analyse the dynamic simulation of the system from 20:00 to next 06:00 in summer. The experimental results show that the average cooling capacity of NRB at night on a typical summer day is 41.5 W/m2, and the maximum is 60.1 W/m2. By comparing the experimental and theoretical cooling capacity, the effective cooling coefficient of NRB is 0.77. The simulation results show that the NRMR system can save 44.62% power in summer compared with the traditional air source refrigeration system in theory.
Keywords: nocturnal radiation cooling; nocturnal radiation board(NRB); nocturnal radiation compound mechanical refrigeration system; experimental verification; TRNSYS; off-grid data station room;
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