《专业英语》课件Unit_32.pptx
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1、Unit32Application Status and Evaluation Method of Renewable Energy in Green Building in ChinaTextThe development of utilization of renewable energy is designated as the preferential area for energy development by The Renewable Energy Law of the Peoples Republic of China.Promoting large-scale utiliza
2、tion of solar energy and geothermal energy in building sector is one of targets of Middle and Long Term Program of Renewable Energy Development in China.Renewable energy utilization in building during the Twelfth Five-Year,is aimed at 2.5billion square meters of floor area,with estimated ability of
3、replacing conventional energy of 30 million tons of standard coal.The green building in China is defined to be“Four-Saving”and“Two-Benign”,namely land saving,energy saving,water saving and material saving,and benign to ambient environment and indoor environment,respectively.If buildings with renewab
4、le energy utilization comply with Evaluation Standard for Green building at the same time,they will be considered firstly in demonstration program and financial subsidy by the government.Therefore,evaluation on renewable energy utilization not only affects quality of green building,but concerns with
5、 governmental fund allocation.In this paper,application status of solar energy and geothermal energy in Green Building Label(GBL)projects is investigated at first.Then,characteristic features of provisions for evaluatingTextrenewable energy utilization in current Chinese national standard are analyz
6、ed.Its followed by introduction of evaluation method for renewable energy in other green building systems.At last,discussion on scientific and technical rationality of the evaluation method is proposed.Investigation sample here is 57 Green Building Label(GBL)projects evaluated by Chinese Society for
7、 Urban Studies by the end of the year of 2010.Among them,32GBL projects are dwellings,and the other 25 projects are public buildings.From another standpoint,GBL project quantity of one-star,two-star and three-star level is 11,25and 21,respectively.Dwellings There are 18 GBL projects with renewable e
8、nergy utilization,accounting 56%of dwelling GBL projects.Furthermore,quantity percentage of projects applying ground source heat pump(GSHP)and solar water heater(SWH)in all dwelling projects is 16%and 50%,respectively.These data suggest that 10%of dwelling projects takes use of both geothermal energ
9、y and solar energy.PV panel is not found in dwelling projects.GSHP is applied in 2 two-star projects and 3 three-star projects,which mostly are middle high rise building.units and installed cooling/heating capacity of the 5 projects.TextThe size of blue circle indicates installed cooling capacity of
10、 project in hot-summer and cold-winter zone,whereas that of red one indicates installed heating capacity of the project in cold zone.Regardless of this project,comprised of dwelling and commercial annex,cooling load of dwelling in hot-summer and cold-winter zone is estimated between 30W/and 35 W/.He
11、ating load of dwelling in cold zone is about 63 W/.SWH is applied in half of dwelling projects.project quantities in different solar energy area according to is given respectively.It should be fully recognized that,2one-star projects(including an indemnificatory housing project)apply SWH as well.Act
12、ually,part of units,especially those at lower floors,is not served by SWH,due to over-shading from adjacent buildings or water system pipe work.However,suggests linear correlation between solar collector area and units served by SWH.Generally,2.09 of solar collector is need for one unit.Public Build
13、ings There are 19 GBL projects with renewable energy utilization,accounting 76%of public building GBL projects.Furthermore,quantity percentage of projects applying GSHP,SWH and PV panel in all public building projects is 48%,44%and 32%,respectively.TextThere even are 4 projects applying all of three
14、 systems above.GSHP is applied in 4 two-star projects and 7 three-star projects.Among them,one three-star project is groundwater heat pump(GWHP);another is district heating and cooling(DHC)system using sea water heat pump(SWHP);the other 9 projects are ground-coupled heat pump(GCHP).as well.Cooling
15、load of public building is about 55 W/.projects applying SWH,and 8 projects applying.Obviously,the more the solar energy,the more projects applying SWH or PV.Whats more,the higher the GBL level,the more projects applying SWH or PV.Without exception,electricity energy generated by PV panel is put int
16、o electricity grid at low-voltage side.Power generation per unit area of most projects is in the rage of 100Wp/to 200Wp/.The national standard,Evaluation Standard for Green building(GB/T 50378-2006),is used to evaluate green building in China.Energy saving and energy resource utilization is one of s
17、ix categories of evaluation indices.Each category includes Prerequisite Provisions,Optional Provisions and Optimal Provisions.TextAll Prerequisite Provisions must be met regardless of GBL star level,whereas Optional Provisions and Optimal Provisions both have different compliance requirements for ea
18、ch level.Furthermore,compliance number of Optional Provisions is required respectively by each category,but Optimal Provisions in all six categories require compliance number only once.A.DwellingIn the standard,there are one Optional Provision and one Optimal Provision for evaluating renewable energ
19、y utilization of dwelling projects.Both of them take consumption ratio of renewable energy to total energy in building as evaluation index.Index value of the former provision is 5%,whereas that of the latter one is 10%.That is intended to encourage fully utilization on renewable energy.For convenien
20、ce,the Optional Provision for renewable energy utilization can be determined compliance if one of three following conditions is satisfied:More than 25%of units in the dwelling or community apply SHW for domestic hot water supply;More than 25%of units in the dwelling or community apply GSHP for space
21、 heating and/or cooling;or More than 50%of units in the dwelling or community apply geothermal water for space heating directly.TextAs for the Optimal Provision,the value for three conditions above increase to 50%,50%and 100%,respectively.Obviously,the GBL project in compliance with the Optimal Prov
22、ision,definitely complies with the Optional Provision.However,project proportion complying the Optional Provision and the Optimal Provision for renewable energy utilization in 32 dwellings investigated,is 56%and 50%,respectively.In other words,all projects applying renewable energy comply with the O
23、ptional Provision,and mostly comply with the Optimal Provision.projects failing in the Optional Provision,are both high-rise and applying solar hot water system.The separate set of evaluation provision on renewable energy utilization has little meaning.B.Public BuildingIn the standard,there is one O
24、ptimal Provision for evaluating renewable energy utilization of public building projects.Other than the index of renewable energy consumption ratio for dwelling,the Optional Provision takes evaluation index as follows:Domestic hot water liters produced by SHWTextmore than 10%of total consumption of
25、domestic hot water in building;Power generated by PV more than 2%of total consumption of electricity in building;or GSHP for space heating and/or cooling.In the 25 public building projects under study,68%complies with the provision.2 projects with renewable energy utilization failed in this provisio
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