Building Energy Code (BEC) and Energy Audit Code …

1 For Buildings Energy efficiency ordinance (Chapter 610) Building Energy code (BEC) and Energy Audit code (EAC) ( 2012 edition ) 1 Overview of BEC Key Energy efficiency Requirements Lighting Installation Max Allowable Lighting Power Density Lighting Control Electrical Installation Motor efficiency Power Distribution Loss Power Quality Energy Metering Lift and escalator installation Electrical Power Power Quality Energy Metering Lift Decoration Load Lift ventilation Air-conditioning Installation Coeff of Performance System Fan Power Piping Frictional Loss Thermal Insulation Energy Efficient Control Design conditions

2 Energy Metering 2 Not regarded as installations to which the BEEO applies Exterior to a Building fa ade lighting, outdoor lighting Not of fixed type, connected via flexible cable with plug Integral to equipment or instrumentation (separate switch) Signage BEC Lighting Installations 3 Type of Space LPD W/m2) Entrance Lobby 15 Workshop 14 Public Circulation Area 15 Lift Lobby 12 Corridor 10 Car Park 6 Toilet / Washroom / Shower Room 13 Office 15 Conference / Seminar Room 16 Staircase 8 Plant Room / Machine Room / Switch Room 12 BEC Lighting Installations Max Allowable Lighting Power Density (W/m2)

3 Space with fixed lighting installation at or exceeding 100W LPD = Total wattage of fixed lighting installation Internal floor area of that space 4 Lighting control Lighting to which the BEEO is applicable and lighting to which the BEEO is not applicable : separate switch Min No. of Lighting Control Points for Office Space Space Area A (m2) N (N : integer) 15 x (N -1) < A 15 x N 0 < N 10 30 x (N-6) < A 30 x (N 5) 10 < N 20 50 x (N -12) < A 50 x (N-11) N > 20 BEC Lighting Installations Area (m2) > 0 - 15 > 15 - 30 > 30 - 45 > 45 - 60 > 60 - 75 > 75 - 90 > 90 - 105 > 105 - 120 > 150 - 180 > 450 - 500 N 1 2 3 4 5 6 7 8 11 21 5 Not regarded as installations to which the BEEO applies Equipment on high voltage ( chiller)

4 BEC Air-conditioning Installations 6 Air distribution system fan power@ for conditioned space CAV W / L/s (supply system air flow); VAV W / L/s (supply system air flow) @ Sum of fan motor power of supply air fan & return air fan (excluding fan power for fresh air only or for exhaust only) Exception : System power < 5 kW; Fan motor power < 1 kW ( FCU) VAV fan (supply or return) with motor output power 5 kW at 50% design flow, motor demands 55% input power Full Load Part Load BEC Air-conditioning Installations Air distribution ductwork leakage limit Ductwork designed for > 750 Pa : min 25% leak-tested (DW143) and meet corresponding leakage limits 7 Variable speed pump with motor output power 5 kW At 50% flow, motor demands 55% input power Piping system frictional loss Piping > 50 mm.

5 Frictional loss 400 Pa/m & flow velocity 3 m/s Piping 50 mm : flow velocity m/s BEC Air-conditioning Installations 8 Min Coefficient of Performance (COP) of Chiller Air-cooled Compressor Scroll Screw Centrifugal Capacity Range (kW) All Ratings Min COP Water-cooled Compressor Scroll Screw Centrifugal Capacity Range (kW) Below 500 kW 500 - 1000 kW Above 1000 kW Below 500 kW 500 - 1000 kW Above 1000 kW Below 500 kW 500 - 1000 kW Above 1000 kW Min COP BEC Air-conditioning Installations 9 Min COP of Unitary Air-conditioner Type of Cooling Air-cooled Water-cooled Capacity range (kW) kW & below, of types outside the scope of Energy efficiency (Labelling of Products)

6 ordinance Above kW & below 40 kW 40 - 200 kW Above 200 kW All Ratings Min COP for split type for non-split type 3 3 for VRF for VRF Unitary air-conditioner of type under scope of Energy efficiency (Labelling of Products) ordinance (Cap. 598) Fulfilling Energy efficiency Grade 2 or Grade 1 BEC Air-conditioning Installations 10 Thermal insulation Min Thickness for Chilled Water Pipework Ambient Outdoor Unconditioned Space Conditioned Space Thermal conductivity (W/m-oC) Surface coefficient h (W/m2-0C) 9 9 10 10 any value Pipe outer diameter do Insulation thickness (mm)

7 Mm 20 15 30 22 29 19 43 28 13 13 mm 21 15 32 23 31 20 46 29 13 13 mm 23 17 35 25 34 21 50 32 13 25 mm 25 18 38 27 36 23 54 35 13 25 mm 26 18 40 28 38 24 57 36 14 25 mm 27 19 42 30 41 25 62 39 14 25 mm 29 20 45 32 43 26 66 41 14 25 mm 29 20 47 32 44 27 69 42 15 25 mm 30 21 49 34 46 28 73 44 15 25 mm 31 21 50 34 47 28 75 45 15 25 BEC Air-conditioning Installations 11 Ambient Outdoor Unconditioned Space Conditioned Space Thermal conductivity (W/m-oC) Surface coefficient h (W/m2-0C) 9 9 10 10 any value Temperature difference between air inside duct/casing and surrounding Ductwork & Casing Insulation thickness (mm) 15 0C 20 13 33 22 31 18 52 30 15 25 20 0C 27 18 46 30 43 25 72 41 15 25 Pipe outer diameter d0 (mm) Refrigerant Pipework Insulation thickness (mm)

8 * 15 mm 22 16 33 24 31 20 47 30 13 13 28 mm 25 18 38 28 36 23 54 35 13 25 42 mm 28 20 41 30 40 25 59 38 13 25 Thermal Insulation Min Thickness for Ductwork & Refrigerant Pipe BEC Air-conditioning Installations * for line temp at 00C 12 System Control Off-hours control during periods of non-use Each system to have auto control to reduce Energy through control setback or equipment shutdown Exception : system 10 kW cooling/heating capacity may be controlled by readily accessible manual off-hour control Each zone controlled by separate temperature control Zone normally not on separate floors Each air-conditioned system provided with automatic temperature control Design conditions Outdoor and Indoor, for Load Calculation BEC Air-conditioning Installations 13 Energy Metering Chilled/heated water plant 350 kW cooling/heating capacity Continuous monitoring facilities to measure input of power (kW)

9 & Energy (kWh) output of cooling/heating power (kW) & Energy (kWh) COP Chiller, heat pump or unitary air-conditioner 350 kW cooling/heating capacity Continuous monitoring facilities to measure input of power (kW) & Energy (kWh) output of cooling/heating power (kW) & Energy (kWh) COP BEC Air-conditioning Installations 14 Not regarded as installations to which the BEEO applies - Operating on high voltage or extra low voltage Owned by electricity supplier & installed in consumer substation BEC Electrical Installations 15 Power Distribution Loss Max Allowable Circuit Copper Loss Circuit type Connection Copper Loss @ Main circuit Distribution transformer to LV Sw/Bd % (unless Tx Rm & Main Sw Rm directly beside, above or below each other)

10 Neutral conductor rating phase conductor rating Feeder LV Sw/Bd direct to equipment % Sub-main circuit 100m in non-residential Building LV Sw/Bd to local DB % Sub-main circuit > 100 m in non-residential Building % [subject to sum of losses in sub-main and final circuits (> 32A) ] Sub-main circuit in residential Building % Final circuit > 32 A Local DB to equipment / outlet points 1 % @ copper loss of total active power (1 or 3-phase) at designed circuit current BEC Electrical Installations 16 Nominal Full-Load (Single-Speed Three-phase Totally Enclosed) Motor Rated Output (P) Min Rated efficiency (%) 2-pole 4-pole kW P < kW kW P < kW kW P < kW kW P < 3 kW 3 kW P < 4 kW 4 kW P < kW kW P < kW 87% kW P < 11 kW 11 kW P < 15 kW 15 kW P < kW kW P < 22 kW 22 kW P < 30 kW 30