Existing studies have shown that the space cooling load oriented to local thermal requirements is significantly influenced by different heat source distributions. However, numerical methods have been mainly used in the analysis based on a fixed airflow field and ignoring the thermal plume. Here, an experiment in a chamber with mixing ventilation was conducted. The heat sources were simulated by metal barrels and an oil-filled radiator, 13 types of heat source distributions were designed and the local cooling load (LCL) was used as the evaluation index. The results show that (1) the LCL is equal to the total amount of heat sources at the steady state in a room with mixing ventilation only if the heat sources are also distributed uniformly; (2) the LCL decreases with a decrease in the intensity of heat sources, achieving a decrease rate of 47.4%–70.8% in the experiment with different intensities; (3) the LCL is 9.2%–22.3% lower than the total amount of heat sources when these are located near the exhaust diffuser or far away from the target zone; (4) owing to its smaller surface area, the LCL with an oil-filled radiator is 7% lower than that with five metal barrels.
LiQMengQLCaiJJYoshinoHMochidaA.Applying support vector machine to predict hourly cooling load in the building. Appl Energy2009;
86: 2249–2256.
2.
Owen MS. 2013 ASHRAE Handbook: Fundamentals (Chapter 18). Nonresidantial cooling and heating load calculation.
Atlanta:
ASHRAE, 2013, pp. 1–3.
3.
HeiselbergP.Room air and contaminant distribution in mixing ventilation. ASHRAE Trans1996;
102: 332–339.
4.
HeGYangXSrebricJ.Removal of contaminants released from room surfaces by displacement and mixing ventilation: modeling and validation. Indoor Air2005;
15: 367–380.
5.
Al-SaneaSAZedanMFAl-HarbiMB.Effect of supply Reynolds number and room aspect ratio on flow and ceiling heat-transfer coefficient for mixing ventilation. Int J Therm Sci2012;
54: 176–187.
AmaiHNovoselacA.Experimental study on air change effectiveness in mixing ventilation. Build Environ2016;
109: 101–111.
8.
YangBMelikovAKKabanshiAZhangCBaumanFSCaoGAwbiHWigöHNiuJCheongKWDThamKWSandbergMNielsenPVKosonenRYaoRKatoSSekharSCSchiavonSKarimipanahTLiXLinZ.A review of advanced air distribution methods – theory, practice, limitations and solutions. Energy Build2019; 202: 109359.
9.
KobayashiNChenQY.Floor-supply displacement ventilation in a small office. Indoor Built Environ2003;
12: 281–291.
10.
SchmelingDBosbachJ.On the influence of sensible heat release on displacement ventilation in a train compartment. Build Environ2017;
125: 248–260.
11.
SchmelingDBosbachJ. Influence of shape and heat release of thermal passenger manikins on the performance of displacement ventilation in a train compartment. Indoor Built Environ. Epub ahead of print 18 June 2019. DOI: 10.1177/1420326X19856673
12.
MinaeiAAshjaeeMGoharkhahM.Experimental and numerical study of mixed and natural convection in an enclosure with a discrete heat source and ventilation ports. Heat Transfer Eng2014;
35: 63–73.
13.
FitzgeraldSDWoodsAW.On the transition from displacement to mixing ventilation with a localized heat source. Build Environ2007;
42: 2210–2217.
14.
WuWFWuXFengYHZhangXX.Simulation of velocity and temperature distributions of displacement ventilation system with single or double heat sources. J Therm Sci2007;
16: 155–158.
15.
KondrashovASboevIDunaevP.Evolution of convective plumes adjacent to localized heat sources of various shapes. Int J Heat Mass Transfer2016;
103: 298–304.
16.
ChengYNiuJGaoN.Stratified air distribution systems in a large lecture theatre: a numerical method to optimize thermal comfort and maximize energy saving. Energy Build2012;
55: 515–525.
17.
SuYXSuALWanX.Modeling of buoyancy-driven natural ventilation in workshop: optimization of distance between heat source and ground. Appl Mech Mater2012;
170–173: 2579–2582.
18.
HarishR.Effect of heat source aspect ratio on turbulent thermal stratification in a naturally ventilated enclosure. Build Environ2018;
143: 473–486.
19.
ParkHJHollandD.The effect of location of a convective heat source on displacement ventilation: CFD study. Build Environ2001;
36: 883–889.
20.
ZhengGShenCMelikovALiX.Improved performance of displacement ventilation by a pipe-embedded window. Build Environ2019;
147: 1–10.
21.
ChengYYangBLinZYangJJiaJDuZ.Cooling load calculation methods in spaces with stratified air: a brief review and numerical investigation. Energy Build2018;
165: 47–55.
22.
AhmedAQGaoSAKareemAK.A numerical study on the effects of exhaust locations on energy consumption and thermal environment in an office room served by displacement ventilation. Energy Convers Manage2016;
117: 74–85.
23.
AhmedAGaoS.Thermal comfort and energy saving evaluation of a combined system in an office room using displacement ventilation. Int J Mech Mechatr Eng2015;
9: 1101–1106.
24.
LoudermilkKJ.Underfloor air distribution solutions for open office applications. ASHRAE Trans1999;
105: 605–613.
25.
ChenQGlicksmanL.System performance evaluation and design guidelines for displacement ventilation.
Atlanta:
ASHRAE, 2003.
26.
ZhouXLianZLanL.Experimental study on a bedside personalized ventilation system for improving sleep comfort and quality. Indoor Built Environ2014;
23: 313–323.
27.
FanDYWangQQZhaoLLiuML.Status, standards, technologies and existing problems of residential ventilation in China. Indoor Built Environ. Epub ahead of print 12 July 2019. DOI: 10.1177/1420326X19862604
28.
FangerPO.Human requirements in future air-conditioned environments. Int J Refrig2001;
24: 148–153.
29.
ChenLLiY. Effects of different auditorium forms on ventilation in a football stadium. Indoor Built Environ. Epub ahead of print 10 September 2019. DOI: 10.1177/1420326X19873132
30.
FlynnMRSusiP.Local exhaust ventilation for the control of welding fumes in the construction industry – a literature review. Ann Occup Hyg2012;
56: 764–776.
31.
WangYHuangYZhouYShuYLiuJ.Experimental study on one-side confined jets from a parallel-flow outlet in a push-pull ventilation system. Indoor Built Environ2015;
24: 73–86.
32.
ZhangTLiPWangS.A personal air distribution system with air terminals embedded in chair armrests on commercial airplanes. Build Environ2012;
47: 89–99.
33.
OhMSAhnJHKimDWFangDSKimY.Thermal comfort and energy saving in a vehicle compartment using a localized air-conditioning system. Appl Energy2014;
133: 14–21.
XieYXFuSCWuCLChaoC.Influence of sinusoidal airflow and airflow distance on human thermal response to a personalized ventilation system. Indoor Built Environ2018;
27: 317–330.
36.
ChauOKLiuCHLeungMK.CFD analysis of the performance of a local exhaust ventilation system in a hospital ward. Indoor Built Environ2006;
15: 257–271.
37.
HuangYQWangYLiuLNielsenPVJensenRLYanFL.Reduced-scale experimental investigation on ventilation performance of a local exhaust hood in an industrial plant. Build Environ2015;
85: 94–103.
38.
YangBSekharC.Interaction of dynamic indoor environment with moving person and performance of ceiling mounted personalized ventilation system. Indoor Built Environ2014;
23: 920–932.
39.
GaoRWangCLiAYuSDengB.A novel targeted personalized ventilation system based on the shooting concept. Build Environ2018;
135: 269–279.
40.
AhmedAQGaoS.Numerical investigation of height impact of local exhaust combined with an office work station on energy saving and indoor environment. Build Environ2017;
122: 194–205.
41.
AhmedAQGaoSKareemAK.Energy saving and indoor thermal comfort evaluation using a novel local exhaust ventilation system for office rooms. Appl Therm Eng2017;
110: 821–834.
42.
LiangCShaoXMelikovAKLiX.Cooling load for the design of air terminals in a general non-uniform indoor environment oriented to local requirements. Energy Build2018;
174: 603–618.
43.
LiangCLiXMelikovAKShaoXLiB.A quantitative relationship between heat gain and local cooling load in a general non-uniform indoor environment. Energy2019;
182: 412–423.
44.
ShenCShaoXLiX.Potential of an air curtain system orientated to create non-uniform indoor thermal environment and save energy. Indoor Built Environ2017;
26: 152–165.
45.
ShaoXMaXLiXLiangC.Fast prediction of non-uniform temperature distribution: a concise expression and reliability analysis. Energy Build2017;
141: 295–307.
MustakallioPBolashikovZRezgalsLLipczynskaAMelikovAKosonenR.Thermal environment in a simulated double office room with convective and radiant cooling systems. Build Environ2017;
123: 88–100.
48.
KosonenRMelikovAYordonovaBBozkhovL. Impact of heat load distribution and strength on airflow pattern in rooms with exposed chilled beams. In: Proceedings of 10th international conference on air distribution in rooms, Helsinki, Finland, June 13–15 2007.
49.
KoskelaHHäggblomHKosonenRRuponenM.Flow pattern and thermal comfort in office environment with active chilled beams. HVAC&R Res2012;
18: 723–736.
50.
ZhuHYuCWCaoS. Ventilation online monitoring and control system from the perspectives of technology application. Indoor Built Environ. Epub ahead of print 4 October 2019. DOI: 10.1177/1420326X19878586
51.
RenCCaoS. Development and application of linear ventilation and temperature models for indoor environmental prediction and HVAC systems control. Sustain Cities Soc. Epub ahead of print 1 November 2019. DOI: 10.1016/j.scs.2019.101673
52.
LestinenSKilpeläInenSKosonenRJokisaloJKoskelaHLiACaoG.Indoor airflow interactions with symmetrical and asymmetrical heat load distributions under diffuse ceiling ventilation. Sci Technol Built Eng2019;
25: 716–731.
53.
ZhaoKLiuXHJiangY.Application of radiant floor cooling in a large open space building with high-intensity solar radiation. Energy Build2013;
66: 246–257.
54.
ISO 7726:2001. Ergonomics of the thermal environment – instrument for measuring physical quantities.
Brussels:
European Committee for Standardization, 2001.
55.
ISO 7730:2005. Ergonomics of the thermal environment – analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria.
Geneva, Switzerland:
International Organization for Standardization, 2005.
56.
EN 15251:2007.Indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics.
Brussels:
European Committee for Standardization, 2007.
57.
DalewskiMMelikovAKVeselyM.Performance of ductless personalized ventilation in conjunction with displacement ventilation: physical environment and human response. Build Environ2014;
81: 354–364.
58.
LiangCShaoXLiX.Energy saving potential of heat removal using natural cooling water in the top zone of buildings with large interior spaces. Build Environ2017;
124: 323–335.
