PRACTICAL CONSIDERATIONS RELATED TO THE SANS …

1 PRACTICAL CONSIDERATIONS RELATED TO THE SANS 100400 PART XA AND THE SANS 204 REQUIREMENTS TO GENERAL REQUIREMENTS OF SANS 10-400 XA REQUIREMENTS AND FILLING IN THE FORMS (DEEMED TO SATISFY) CONSIDERATIONS WHEN DESIGNING FENESTRATION CALCULATIONS FOR A SIMPLE HOUSE (RDP HOUSE) EXERCISE COMPILED BY RG YOUNG-PUGH FOR CPUT- DATE 2012-10 INTRODUCTION and Only tick this box if <15% Tick this box if >15% And delete competent person RATIONAL DESIGN ROUTE DEEMED TO SATISFY ROUTE OTHER ENERGY REQUIREMENTS NOTE THAT FENESTRATION DESIGN CAN NOT BE CONSIDERED IN ISOLATION AND THE DETAILS OF THE FOLLOWING ALSO NEED TO BE DEALT WITH ACCORDING TO CHECKLISTS WHEN SUBMITTING TO THE LOCAL AUTHORITY: EXTERNAL WALLS SPECIFICATIONS ROOF SPECIFICATIONS INCL INSULATION UNDERFLOOR HEATING AND INSULATION OF SURFACE BED OR PERIMETER SERVICES EG LIGHTING AND AIRCON/ HEATING HOT WATER SUPPLY SOME GENERAL CONSIDERATIONS WHEN DESIGNING TO MEET PART XA AND SAND 204 FENESTRATION FACE THE BUILDINGS LIVING AREAS NORTH WHERE POSSIBLE WITH LONG AXIS NORTH SIZE THE OPENINGS SUITABLY SHADE YOUR WINDOWS SUITABLY USE SUITABLY SPECIFIED WINDOWS AND GLAZING AND FRAMES VENTILATE AVOID AIRCON SYSTEMS IF POSSIBLE RDP HOUSE SIMPLE FENESTRATION CALCULATIONS IN TERMS OF SANS 10-400 PART XA CPUT BTECH -YEAR 4-LECTURER R YOUNG-PUGH STEP 1 SET UP A SPREADSHEET OF ALL THE WINDOWS AND DOORS DETERMINE YOUR NETT FLOOR AREA (EXCL WALLS, STORAGE) DOES THE BUILDING FENESTRATION COMPLY WITH THE 15% RULE IE IS THE FENESTRATION AREA LESS THAN 15% OF THE NETT FLOOR AREA ?

2 FLOOR AREA X .15 =50 X = 7,5 m2 (15%) ACTUAL FENESTRATION AREA = 10,28 m2 THE BUILDING FENESTRATION AREA EXCEEDS THE PERMISSABLE 15% (IT IS 20,6%) SectorSolar Exposurestorey / roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E )ConductanceSHGupper groundm2table 6table 6( P )( H )( G )annexure c4fxgfhnlivingW1 Atimber +4mm+ 1W1 Btimber +4mm+ 2W1 Ctimber +4mm+ + + full 4area x 0,15 = 50 x 0,15 =7,5m2 glazing allowedactual 10,280 therefore fenestration calcs allowedSectorSolar Exposurestorey/ roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E ) ( P )( H )( G ) Levelm2 x zone 4 cstant50 x 1,450 x 0,13okokproposed < target FENESTRATION : NATURALLY VENTILATED BUILDING - RDP HOUSE - Western Cape zone 4- nett floor area =50m2 Fenestration ElementsWindow SizeWindow Element RatingShading P/HProposed P/HFenestration ElementsWindow SizeWindow Element RatingShading Proposed STEP 2 START FENESTRATION CALCULATIONS: REFER TO SANS 204 PART DETERMINE ORIENTATION, ZONE, OCCUPANCY TABLE 5 GIVES CONSTANTS FOR CONDUCTANCE AND SOLAR HEAT GAIN MULTIPLY THE CONSTANTS X NETT AREA PER FLOOR TO GIVE TARGET FIGURES SectorSolar Exposurestorey / roomIdentifier No.

3 TypeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E )ConductanceSHGupper groundm2table 6table 6( P )( H )( G )annexure c4fxgfhnlivingW1 Atimber +4mm+ 1W1 Btimber +4mm+ 2W1 Ctimber +4mm+ + + full 4area x 0,15 = 50 x 0,15 =7,5m2 glazing allowedactual 10,280 therefore fenestration calcs allowedSectorSolar Exposurestorey/ roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E ) ( P )( H )( G ) Levelm2 x zone 4 cstant50 x 1,450 x 0,13okokproposed < target FENESTRATION : NATURALLY VENTILATED BUILDING - RDP HOUSE - Western Cape zone 4- nett floor area =50m2 Fenestration ElementsWindow SizeWindow Element RatingShading P/HProposed P/HFenestration ElementsWindow SizeWindow Element RatingShading Proposed STEP 3 CHECK CONDUCTANCE LOOK AT SANS 204 TABLE 6 SectorSolar Exposurestorey / roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E )ConductanceSHGupper groundm2table 6table 6( P )( H )( G )annexure c4fxgfhnlivingW1 Atimber +4mm+ 1W1 Btimber +4mm+ 2W1 Ctimber +4mm+ + + full 4area x 0,15 = 50 x 0,15 =7,5m2 glazing allowedactual 10,280 therefore fenestration calcs allowedSectorSolar Exposurestorey/ roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E ) ( P )( H )( G ) Levelm2 x zone 4 cstant50 x 1,450 x 0,13okokproposed < target FENESTRATION : NATURALLY VENTILATED BUILDING - RDP HOUSE - Western Cape zone 4- nett floor area =50m2 Fenestration ElementsWindow SizeWindow Element RatingShading P/HProposed P/HFenestration ElementsWindow SizeWindow Element RatingShading Proposed CONDUCTANCE CALCULATIONS LOWER U VALUE = BETTER FROM TABLE 6 SANS 204 AREA X U VALUE STEP 4.

4 CHECK SOLAR HEAT GAIN (SHG) DRAW SECTIONS THROUGH EACH FENESTRATION ELEMENT REFER TO TABLE 6 OF SANS 204 FOR SHGC OR MANUFACTURERS DATA CALCULATE THE EXPOSURE FOR EXPOSURE SEE NEXT SLIDE AREA X SHGC X EXPOSURE SectorSolar Exposurestorey / roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E )ConductanceSHGupper groundm2table 6table 6( P )( H )( G )annexure c4fxgfhnlivingW1 Atimber +4mm+ 1W1 Btimber +4mm+ 2W1 Ctimber +4mm+ + + full 4area x 0,15 = 50 x 0,15 =7,5m2 glazing allowedactual 10,280 therefore fenestration calcs allowedSectorSolar Exposurestorey/ roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E ) ( P )( H )( G ) Levelm2 x zone 4 cstant50 x 1,450 x 0,13okokproposed < target FENESTRATION : NATURALLY VENTILATED BUILDING - RDP HOUSE - Western Cape zone 4- nett floor area =50m2 Fenestration ElementsWindow SizeWindow Element RatingShading P/HProposed P/HFenestration ElementsWindow SizeWindow Element RatingShading Proposed SOLAR HEAT GAIN AREA X SHGC X SOLAR EXPOSURE FACTOR = SHG IN ORDER TO CALCULATE EXPOSURE CALCULATE P / H VALUES THEN REFER TO ANNEXURE C OF SANS 204 FOR THAT ZONE AND THAT ORIENTATION SectorSolar Exposurestorey / roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E )ConductanceSHGupper groundm2table 6table 6( P )( H )( G )annexure c4fxgfhnlivingW1 Atimber +4mm+ 1W1 Btimber +4mm+ 2W1 Ctimber +4mm+ + + full 4area x 0,15 = 50 x 0,15 =7,5m2 glazing allowedactual 10,280 therefore fenestration calcs allowedSectorSolar Exposurestorey/ roomIdentifier No.

5 TypeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E ) ( P )( H )( G ) Levelm2 x zone 4 cstant50 x 1,450 x 0,13okokproposed < target FENESTRATION : NATURALLY VENTILATED BUILDING - RDP HOUSE - Western Cape zone 4- nett floor area =50m2 Fenestration ElementsWindow SizeWindow Element RatingShading P/HProposed P/HFenestration ElementsWindow SizeWindow Element RatingShading Proposed P/H VALUES FOR EACH WINDOW FOR EACH ORIENTATION AND THAT ZONE SOLAR EXPOSURE REFER TO ANNEXURE C4 FOR THIS FACTOR NOTE THAT G IS ONLY A FACTOR IF YOU ARE CONSIDERING AIRCONDITIONING OR MECHANICAL VENTILATTION WHICH NEEDS A SEPARATE CALCULATION CONCLUSION SectorSolar Exposurestorey / roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E )ConductanceSHGupper groundm2table 6table 6( P )( H )( G )annexure c4fxgfhnlivingW1 Atimber +4mm+ 1W1 Btimber +4mm+ 2W1 Ctimber +4mm+ + + full 4area x 0,15 = 50 x 0,15 =7,5m2 glazing allowedactual 10,280 therefore fenestration calcs allowedSectorSolar Exposurestorey/ roomIdentifier No:typeWidthHeightAreaU-valueSHGCO rientationProjectionHeight 1 Height 2 Factor ( E ) ( P )( H )( G ) Levelm2 x zone 4 cstant50 x 1,450 x 0,13okokproposed < target FENESTRATION.

6 NATURALLY VENTILATED BUILDING - RDP HOUSE - Western Cape zone 4- nett floor area =50m2 Fenestration ElementsWindow SizeWindow Element RatingShading P/HProposed P/HFenestration ElementsWindow SizeWindow Element RatingShading Proposed THE FENESTRATION COMPLIES WITH SANS 10-400 WHEN THE NETT FLOOR AREA OF THE HOUSE IS CONSIDERED FENESTRATION DESIGN: PRACTICAL EXERCISE A PROSPECTIVE OWNER COMES TO YOU FOR YOUR ADVICE ON THE ATTACHED PROPOSED HOUSE. THE HOUSE IS CURRENTLY DESIGNED TO MEET THE 15% RULE RELATED TO FENESTRATION AND FLOOR AREA, BUT THEY ARE NOT HAPPY THEY DON T WANT THE COST OF A FULL RATIONAL DESIGN HOW CAN YOU GIVE THEM MORE LIGHT AND VIEWS BUT STILL COMPLY WITH THE SANS 204 FENESTRATION REQUIREMENTS ? SHOW ALL CALCULATIONS. REFERENCES STRUCTATHERM TRAINING MATERIAL AS SUPPLIED AND PREPARED BY MR H HARRIS SUBMISSION CHECKLISTS BY SUE CROWTHER MARCEL AND SHARON KEUTER OF SPREADSHEETS AS ADAPTED FOR THIS SUMMARY: ALSO FENESTRATION EXAMPLE.

7 WORKING COPIES AVAILABLE FROM SANS 10-400 SANS 204 VARIOUS PUBLICALLY AVAILABLE SAIAT REFERENCE DOCUMENTS