BEEP Guidelines for Energy Efficient Design of Multi-Storey Residential Buildings

Transcription

1 BEEP Guidelines for Energy Efficient Design of Multi-Storey Residential Buildings Saswati Chetia & Sameer Maithel BEEP International Conference Energy Efficient Building Design: Experiences & Way Forward Technical Session II, November 29, 2016, New Delhi

2 Outline Understanding electricity consumption in middle income housing flats? BEEP Design Guidelines for multi-storey residential buildings BEEP experience of Implementing Design Guidelines Experiences from a few projects Conclusion Key points 2

3 Survey of Electricity Use And Designs of Flats NCR & Chennai NCR: 732 Flats Middle-Income Flat Area: m 2 Chennai: 417 Flats 3

4 Energy Performance Index National Capital Region & Chennai NCR Chennai Majority ~ 25 to 75 kwh/m 2 /year Average ~ 44 & 48 kwh/m 2 /year 4

5 Understanding How Electricity Is Used EPI (kwh/ m2/ year) Air conditioners, Evaporative Coolers, Fans, Electric Geysers Base Load: Lighting, washing m/c, refrigerator, TV, computers, Kitchen appliances,.. Design & comfort demand of the occupants 5

6 Implications kwh/m 2 /year Climate Responsive Design + EE Appliances + Energy conscious occupants Poor thermal design+ High reliance on AC kwh/m 2 /year Average EPI kwh/m 2 /year 6

7 Design Guidelines for Energy-Efficient Residential Buildings 15 Key Recommendations Building Massing Building Envelope Space Cooling Systems Energy Efficient Appliances Common Services Renewable Energy 7

8 Thermally Comfortable & Energy- Efficient Housing? Does not heat up abnormally during long summer season. The requirement for use of ACs is minimized. Good ventilation to utilize cool breeze during evening, night and mornings. Adequate day lighting (kitchen, corridors, rooms,..); minimizes the need to switch-on artificial light during day. The use of electricity/fuel for heating water is minimized. Utilizes solar energy, heat pumps, Energy-efficient lighting, equipment, appliances, Low embodied energy in construction minimizing the use of energy intensive materials steel, cement, glass,. Affordable No/low additional construction cost. Low electricity bill for occupants. Easy and low-cost maintenance. 8

9 Experience of Working With Residential Projects D B Pride, Indore (1743 units) Smart GHAR 3, Rajkot (1176 units) P-17 Residential Project, Mahindra World City, Chennai (874 units) 9

10 Different Units, Different Issues 10

11 Different Units, Different Issues ~5 o C Difference 11

12 Reducing Heat Gains - Example Top floor bedroom with roof insulation: 3 C reduction in indoor peak temperature Insulated roof AAC walls External movable shading WWR West facing bedroom with movable shading: 2-3 C reduction in indoor peak temperature 12

13 Improving Natural Ventilation - Example Sliding window (50% openable) Casement window (90% openable) Around 2 C reduction in indoor peak temperature; If outdoor temperature is lower than indoor temperature 13

14 Single Sided Ventilation 14

15 Improving Natural Ventilation - Example 15

16 Low Energy Cooling Technologies - Example Evaporative Cooling 16

17 COMMON SYSTEM INDIVIDUAL SYSTEM Water cooled split system 17

18 Conclusions Reduce heat gains Identify flats having over-heating problem and take appropriate passive measures Enhance natural ventilation In dense multi-storey housing apart from proper design and placement of windows; innovative concepts are required for natural ventilation in flats which are not favourably placed to harness natural wind flow Reducing use of electricity and fossil fuels for cooling & water heating Maximize utilization of solar energy Better understanding of the impact of going high-rise on operational and embodied energy Address the issues of thermal comfort and embodied energy while choosing new technologies for mass housing 18

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