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CII PRESENTATION

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Information about CII PRESENTATION
Education

Published on January 9, 2008

Author: Berta

Source: authorstream.com

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ENERGY EFFICIENT WINDOWS AND BUILDING DESIGN:  ENERGY EFFICIENT WINDOWS AND BUILDING DESIGN ARCHITECTS’ AND CONSULTANTS’ POINT OF VIEW. BY K.V.PRADEEP MANAGING DIRECTOR DVP CONSULTING PVT. LTD. BANGALORE, WHAT DO WE MEAN BY ENERGY EFFICIENCY?:  WHAT DO WE MEAN BY ENERGY EFFICIENCY? WE MEAN HOW EFFICIENTLY WE ARE USING ENERGY FOR VAROIUS SERVICES IN THE BUILDING IN OTHER WORDS…. HOW MUCH LESS ENERGY THAN CONVENTIONAL METHODS WE ARE USING TO ACHIEVE SAME OR BETTER RESULTS :  HOW MUCH LESS ENERGY THAN CONVENTIONAL METHODS WE ARE USING TO ACHIEVE SAME OR BETTER RESULTS AIR CONDITIONING IS ONE OF THE MAJOR CONSUMER OF ENERGY IN ANY AIR CONDITIONED BUILDING AIR CONDITIONING LOAD INCREASES DUE TO:  AIR CONDITIONING LOAD INCREASES DUE TO SOLAR HEAT GAIN THROUGH WALLS WINDOWS ROOF ETC. IN A COMFORT AIR CONDITIONING APPLICATION:  IN A COMFORT AIR CONDITIONING APPLICATION SOLAR HEAT GAIN ACCOUNTS FOR AS HIGH AS 30 – 40 % OF THE AIR CONDITIONING LOAD HENCE IT IS ESSENTIAL TO REDUCE THIS HEAT GAIN TO REDUCE AIR CONDITIONER SIZE AND COST OF BUYING AND OWNING. EFFECTS OF SOLAR RADIATION ENTERING BUILDING:  EFFECTS OF SOLAR RADIATION ENTERING BUILDING Increased Heat and Hence stress on people Reduces working efficiency of people. Reduces Efficiency & Life of machines Direct sunlight induces glare making visual tasks difficult to accomplish Create unsafe working conditions And others…… HOW DOES THIS ENTER THE BUILDING?:  HOW DOES THIS ENTER THE BUILDING? SOLAR ENERGY ENTERS BUILDING BY CONDUCTION ( OUTER TO INNER WALL, GLASS) CONVECTION ( FROM INNER SURFACE TO THE CONDITIONED AREA) RADIATION ( THROUGH WINDOWS ETC.) THE PROBLEM IS MORE AGGRAVATED WHEN….:  THE PROBLEM IS MORE AGGRAVATED WHEN…. Outdoor temperatures are very high People work in fixed postures / desks Ventilation is poor in the area Already other heat sources are in the area like computers etc. HOW TO REDUCE SOLAR GAIN?:  HOW TO REDUCE SOLAR GAIN? Solar Heat Gain can be reduced by Proper orientation of the building / walls / windows Control unwanted sunlight Choose right material for construction Provide Insulation for exposed Roof ORIENTATION:  ORIENTATION Avoid West facing glass North facing glass preferred Prefer shading by other structures / trees etc. Prefer Longer south & North Facing walls & Windows CONTROL UNWANTED SUNLIGHT:  CONTROL UNWANTED SUNLIGHT Retractable Sunshades Adjustable Louvers Light colored Louvers Projecting Roof – Balcony Venetian Blinds External – The best Method Internal Horizontal Vertical Special Window Glass Special Type of Glasses:  Special Type of Glasses Reflective Glass – acts as one way mirror reflecting incident light backwards Heat Absorbing Glass – Heavy tinted- absorbs and reradiates later Double Glazed windows Neutral Tinted glass for glare reduction OTHER IMPORTANT POINTS:  OTHER IMPORTANT POINTS 10 % of Floor Area should be Windows for natural Lighting 5 – 10 % floor area should be fully open able windows for natural ventilation. Forced ventilation though can not cool the area, can keep the area comfortable in non A/c areas. CASE STUDY:  CASE STUDY SOFTWARE FACILITY – GR. + 3 UPPER FLOORS. TOTAL AREA : 120,000 SFT EACH FLOOR : 30,000 SFT BUILDING SHAPE : 1)175 x 175 SQUARE 2) 300 x 100 RECTANGULAR CASE STUDY:  CASE STUDY ASSUMPTIONS : OCCUPANCY : ONE PERSON / 100 SFT FRESH AIR : 20 CFM / PERSON COMPUTERS : 150 W / PC LIGHTING : 1.5 W / SFT CASE STUDY:  CASE STUDY COOLING LOAD : (20 % GLASS AREA) ROOF IS INSULATED FOR SQUARE BLDG. - 100 TR / FLOOR FOR RECT. BLDG. - 98 TR / FLOOR COOLING LOAD : (20 % GLASS AREA) ROOF IS NOT INSULATED FOR SQUARE BLDG. - 138 TR / FLOOR FOR RECT. BLDG. - 136 TR / FLOOR CASE STUDY:  CASE STUDY COOLING LOAD : (80 % GLASS AREA) ROOF IS INSULATED FOR SQUARE BLDG. - 119 TR / FLOOR FOR RECT. BLDG. - 114 TR / FLOOR COOLING LOAD : (80 % GLASS AREA) ROOF IS NOT INSULATED FOR SQUARE BLDG. - 158 TR / FLOOR FOR RECT. BLDG. - 152 TR / FLOOR CASE STUDY:  CASE STUDY COOLING LOAD FOR THE ENTIRE RECT. BLDG. (20 % GLASS AREA) : 356 TR COOLING LOAD FOR THE ENTIRE RECT. BLDG. (80 % GLASS AREA) : 432 TR THEREFORE, WE REQUIRE AN ADDITIONAL 17.5% COOLING CAPACITY IF GLASS AREA IS 80% CASE STUDY:  CASE STUDY RUNNING COST / YEAR 20%GLASS AREA BLDG. 356TRX8HRX5DX52WX1KW/TRX RS.5X0.7 =RS. 25.9 LAKHS 80%GLASS AREA BLDG. 432TRX8HRX5DX52WX1KW/TRX RS.5X0.7 =RS. 31.4 LAKHS CONCLUSION:  CONCLUSION THE CASE STUDY SHOWS THAT IT IS IMPERATIVE THAT THE GLASS AREA BE KEPT TO A MINIMUM OR IF THIS IS NOT POSSIBLE DUE TO ARCHITECTURAL REASONS, TO SELECT A GLAZING CAPABLE OF REDUCING THE SOLAR HEAT GAIN. THANK YOU FOR YOUR TIME:  THANK YOU FOR YOUR TIME CASE STUDY:  CASE STUDY COOLING LOAD : (80 % GLASS AREA) ROOF IS INSULATED FOR SQUARE BLDG. - 119 TR / FLOOR FOR RECT. BLDG. - 114 TR / FLOOR COOLING LOAD : (80 % GLASS AREA) ROOF IS UNINSULATED FOR SQUARE BLDG. - 158 TR / FLOOR FOR RECT. BLDG. - 152 TR / FLOOR

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