In the technical framework of EECA 2024, Energy Recovery Loop (ERL) positioning is a critical layout strategy for tropical climates like Malaysia. Unlike standard AHUs that draw in 100% hot, humid ambient air, an ERL configuration "recycles" the cool, dry energy from the building's exhaust air to pre-condition the incoming fresh air. This layout can reduce the cooling load on your central chiller plant by up to 30%, directly lowering your Building Energy Intensity (BEI).
At EKG (Malaysia) SDN BHD, we utilize 3D BIM Coordination to engineer the complex "twin-path" positioning required for high-efficiency energy recovery.
The efficiency of an Energy Recovery Loop depends entirely on the physical proximity of the Fresh Air (FA) intake and the Exhaust Air (EA) discharge.
Counter-Flow Positioning: For maximum heat transfer, the intake and exhaust paths are positioned in a counter-flow arrangement within the AHU casing. This ensures the greatest temperature differential across the Enthalpy Recovery Wheel (ERW) or plate heat exchanger.
Vertical vs. Horizontal Stacking: To save floor space, we often utilize a Vertical Stack Layout. The exhaust section is positioned directly above the supply section, allowing the energy recovery component to bridge both air streams within a single, compact footprint.
A major challenge in ERL positioning is ensuring that exhaust air (containing CO2 and odors) does not "leak" into the fresh air stream.
Pressure Gradient Logic: We engineer the layout so that the fresh air side is always at a higher static pressure than the exhaust side. If any minor leakage occurs at the seals, clean air will leak into the exhaust stream, rather than the other way around.
Purge Sector Optimization: Modern ERWs include a "Purge Sector" in their positioning. As the wheel rotates from the exhaust side to the supply side, a small amount of fresh air is used to "flush" the wheel's honeycombs, ensuring 99.9% air purity.
| Metric | Standard AHU Layout | Energy Recovery AHU (EKG) |
| Cooling Load | 100% (High Peak) | Reduced by 25% - 30% |
| SFP Impact | Low (Single Path) | Moderate (Requires Low-DP Design) |
| BEI Contribution | Moderate | High Potential for 5-Star Rating |
| Fresh Air Treatment | High Energy Cost | "Free" Pre-Conditioning |
| Chiller Downsizing | Not Possible | Can Downsize Chiller Tonnage |
| EECA 2024 Status | Audit Risk | Star-Rating Optimized |
While energy recovery saves cooling energy, the extra component adds air-side resistance, which can increase Specific Fan Power (SFP). EKG optimizes the layout to counteract this:
Low-Velocity Transitions: We expand the AHU casing at the recovery loop section to lower the air velocity. This reduces the pressure drop ($\Delta P$) across the wheel, keeping the SFP well within the MS 1525 limit of 1.6 $kW/m^3/s$.
Bypass Dampers: Our layouts include an integrated bypass path. During "free cooling" periods or when the wheel is being serviced, the dampers open to allow air to skip the wheel, reducing the fan's workload and saving energy.
Technical Integrity: We provide the Psychrometric Calculations and enthalpy-transfer data required by Registered Energy Managers (REM) for statutory audits.
3D BIM Coordination: Our 3D process ensures the complex "four-duct" arrangement (FA, RA, SA, EA) fits perfectly within your mechanical room without clashing with structural beams.
BOMBA-Compliant Safety: All energy recovery media and internal seals are fire-rated (Class 0 or B1).
Is your facility's fresh air load driving up your TNB bills? Contact EKG (Malaysia) SDN BHD today. We specialize in engineering Energy Recovery Loop layouts that maximize thermal efficiency and minimize your building's energy intensity for full 2026 compliance.
How much of your building's energy cost is currently attributed to treating fresh air?
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