Understanding and Applying BCA Green Mark for Existing Non-Residential Buildings 2017

Building Description

You are to include the following particulars in your submission: Course Code, Title of the TMA, SUSS PI No., Your Name, and Submission Date.

Question 1

"The Section 2 of BCA Green Mark for Existing Non-Residential Buildings 2017 (GM ENRB: 2017 Simplified Version) encourages good passive design with the use of energy efficient equipment and system to reduce energy consumption of the building. The appropriate use of natural ventilation and building envelope with good orientation and thermal performance help to reduce air-conditioning load. This will reduce the overall energy consumption. In addition, the use of renewable energy can further reduce the building’s overall carbon emission and grid dependence.

Being the building manager of the existing office building. You are required to demonstrate your understanding of the GM ENRB: 2017 (Simplified Version) and make preliminary
assessment before submission to BCA for Green Mark certification. You are required to calculate the elective requirements of Section 2 – Building energy performance (GM Criteria 2.1 to 2.9) based on the information provided below.

Brief description of the building

The building is situated at the eastern part of Singapore and it has been there for many years. The building has sufficient numbers of surface car-parking lots that are provided within its boundary. Therefore, it is not essential to provide a multi-storey carpark (MSCP) or mechanical parking system.This is a four storey building with single occupant. This building consists of mainly office premises. Levels 1, 2 & half of level 3 office floor areas are air-conditioned (87.5% of floor area). The other half of level 3 is designated as multipurpose usage and is naturally ventilated (12.5% of floor area). The casement windows at level 3 are located facing north and south directions at the multipurpose area. Open roof deck (landscaped roof garden) and common areas are excluded in the calculation of floor areas. Photovoltaics panels are also partially installed at the open roof deck and generate 1.2% of annual energy usage. All toilet areas are equipped with mechanical ventilation system and staircases are naturally ventilated. There is no escalators at this premise and lifts are equipped with Variable Voltage Variable Frequency (VVVF) motor drive with sleep mode.

FMT311e Tutor-Marked Assignment 02

The envelope design consists of a flush curtain wall construction with double glazing at the façades of the building. According to the record, ETTV is calculated at 43.5 W/m². The
Energy Use Intensity (EUI) calculated is 85 kWh/m²/yr. The building maintenance team conducted a survey and submitted the following information.

Air conditioning system

1. Cooling load 550 RT

2. Cooling Capacity COP 6.8

3. Chilled water pump power 44 kW

4. Condenser water pump power 36 kW

5. Cooling tower fan power 18 kW

6. Air distribution operating system efficiency: 0.19 kW/RT Lighting power budget

7. Office & multipurpose area (2,000 m²) 11 W/m²

8. Lobbies (100m²) 8 W/m²

9. Staircase (30m²) 5 W/m²

Appraise and provide the appropriate Green Mark points for (GM ENRB: 2017, simplified version), GM criteria 2.1 to 2.9 based on the information provided above.