Details

---

Low BEI AHU Layout: The BEI-Rated AHU Configuration

In the regulatory framework of EECA 2024, a BEI-Rated AHU is no longer defined just by its cooling capacity, but by its contribution to the Building Energy Intensity (BEI)—measured in $kWh/m^2/year$. To achieve a 3-star to 5-star rating, the AHU must be engineered as a high-efficiency engine that minimizes "parasitic" electrical loads while maximizing thermal delivery.

EKG (Malaysia) SDN BHD specializes in configuring AHUs that act as the primary drivers for lowering a facility's BEI, ensuring full compliance with the mandatory energy star-rating audits.

---

1. The BEI-Rated Technical Core

A BEI-rated AHU is built on three mandatory mechanical pillars:

• Ultra-Low SFP (Specific Fan Power): To secure a high BEI rating, the Specific Fan Power must be pushed well below the MS 1525 limit of 1.6 $kW/m^3/s$. We target an SFP of 1.0 to 1.1 $kW/m^3/s$ through the use of IE5 EC Plug Fan Arrays.

• Total Enthalpy Recovery: In Malaysia’s tropical climate, up to 30% of a building's BEI is consumed by cooling fresh air. We integrate Enthalpy Recovery Wheels (ERW) to pre-condition intake air using the "exhaust energy" from the building, drastically reducing the load on the central chiller plant.

• Thermal Integrity (TB2/L1): A BEI-rated unit must have a "leak-proof" envelope. We utilize TB2 thermal breaks to prevent heat gain and L1-class airtight seals to ensure no treated air is wasted in the mechanical room.

---

2. Layout Strategies for BEI Reduction

The physical arrangement of the AHU components within the layout is critical for reducing internal pressure drops ($\Delta P$):

• Low Face-Velocity Design: We increase the cross-sectional area of the unit to maintain air velocity through the coils and filters at < 2.0 m/s. Lower velocity exponentially reduces the air-side resistance, allowing the fan to consume less energy.

• Static Regain Plenums: The layout includes a specialized discharge section that allows high-velocity air to stabilize. This "Static Regain" process converts kinetic energy into useful pressure, improving the Coefficient of Performance (COP) of the entire air-side system.

---

3. Comparison: Standard AHU vs. BEI-Rated AHU

Metric	Standard AHU (Non-Rated)	EKG BEI-Rated AHU
Star Rating Potential	1-Star (Risk of Fines)	4 to 5-Stars (Compliant)
SFP Rating	1.8 - 2.2 $kW/m^3/s$	< 1.1 $kW/m^3/s$
Motor Drive	Belt-Driven AC (IE2)	Direct-Drive EC Array (IE5)
Energy Recovery	None	Integrated Enthalpy Wheel
Casing Leakage	L3 (High Loss)	L1 (Airtight Sealed)
Control Logic	Constant Volume	Demand-Controlled (DCV)

---

4. Digital Integration for BEI Audits

Under the EECA 2024, "Designated Buildings" must provide verifiable energy data. A BEI-rated AHU from EKG acts as a data hub:

• Smart Energy Metering: Integrated kWh meters track the fan's real-time consumption.

• Condition-Based Monitoring: Digital pressure transducers track filter health, preventing "SFP Creep" caused by operating against clogged filters.

• BMS Connectivity: Seamless integration via BACnet or Modbus allows the building’s Energy Management System (EnMS) to automatically adjust speeds based on real-time BEI targets.

---

Why Partner with EKG (Malaysia) SDN BHD?

• Technical Integrity: We provide the BEI impact projections and SFP calculations required by Registered Energy Managers (REM) for statutory reporting.

• 3D BIM Coordination: Our 3D modeling ensures that these high-performance (and often larger) units are placed with optimized duct paths to minimize energy-wasting turbulence.

• BOMBA-Compliant Safety: All BEI-rated materials, including high-density PU insulation, are fire-rated (Class 0 or B1) to meet international safety standards.

Is your facility's AHU infrastructure ready for the 2026 mandatory energy audits? Contact EKG (Malaysia) SDN BHD today for a technical BEI-rating audit and a proposal to modernize your HVAC system into a high-performance asset.