Los Angeles EBEWE Ordinance: Passing ASHRAE Level II Audits & Cutting EUI 15%

Q: What is the primary goal of the LA EBEWE Ordinance for commercial buildings?

The primary goal is to improve energy and water efficiency in existing commercial buildings over 20,000 sq ft. It mandates benchmarking and requires a minimum 15% reduction in Energy Use Intensity (EUI) and Water Use Intensity (WUI) over each five-year compliance cycle, promoting sustainable operations across Los Angeles.

Q: Why is an ASHRAE Level II audit crucial for EBEWE compliance?

An ASHRAE Level II audit provides a detailed engineering analysis of a building's energy systems, identifying specific Energy Conservation Measures (ECMs) with cost-benefit analyses. This depth is essential for developing a strategic plan to meet EBEWE's mandated 15% EUI reduction, going beyond simple benchmarking to offer actionable solutions.

Q: How do VFD retrofits contribute to EBEWE EUI reduction?

VFD retrofits on motors driving pumps and fans allow these systems to operate at variable speeds matching actual load demands, significantly reducing energy consumption compared to constant-speed operation. This optimization directly lowers the building's Energy Use Intensity (EUI), helping facilities meet their EBEWE reduction targets efficiently.

Q: What role does cooling tower sub-metering play in EBEWE water compliance?

Cooling tower sub-metering provides precise data on makeup water consumption, enabling accurate tracking and identification of inefficiencies like leaks or excessive blowdown. This data is vital for demonstrating compliance with EBEWE's Water Use Intensity (WUI) reduction requirements and for implementing targeted water conservation strategies.

Expert mechanical engineering to achieve EBEWE compliance and significant Energy Use Intensity (EUI) reductions for large commercial facilities in Los Angeles.

Direct Engineering Summary

The Los Angeles Existing Building Energy and Water Efficiency (EBEWE) Ordinance mandates that commercial buildings over 20,000 sq ft benchmark energy and water use, then achieve 5-year reduction targets, typically 15% EUI. Compliance is often met through ASHRAE Level II energy audits, retro-commissioning, and targeted mechanical system upgrades like VFD retrofits and cooling tower sub-metering. Western Mechanical, Inc., with CSLB #618138 and UA Local 250 journeymen, specializes in these services, ensuring facilities meet EBEWE requirements and optimize operational efficiency. Contact us at (661) 251-0111.

Los Angeles EBEWE Ordinance: Passing ASHRAE Level II Audits & Cutting EUI 15% - Western Mechanical, Inc. CSLB #618138

Engineering Tolerances & Governing Standards

Parameter	Specification	Standard
EBEWE Building Size Threshold	>20,000 sq ft (gross floor area)	LAMC Section 99.04.020
EUI Reduction Target	Minimum 15% over 5-year cycle	LAMC Section 99.04.050
ASHRAE Audit Level for EBEWE	Level II (Energy Survey & Analysis)	ASHRAE Standard 211-2018
Cooling Tower Sub-metering Accuracy	+/- 2% of reading	AWWA C700/C708
VFD Harmonic Distortion (THD)	<5% Total Harmonic Distortion (THD)	IEEE 519-2014

Navigating LA EBEWE Compliance with ASHRAE Level II Audits

The Los Angeles Existing Building Energy and Water Efficiency (EBEWE) Ordinance requires commercial buildings exceeding 20,000 square feet to rigorously benchmark their energy and water consumption. Beyond mere reporting, the ordinance mandates a sustained reduction in Energy Use Intensity (EUI) and Water Use Intensity (WUI) over five-year cycles, typically targeting a 15% improvement. Achieving this often necessitates a comprehensive ASHRAE Level II energy audit, which goes beyond basic benchmarking to identify specific, cost-effective energy conservation measures (ECMs) with detailed financial analysis and payback periods.

An ASHRAE Level II audit conducted by Western Mechanical, Inc. involves a thorough site investigation, detailed energy balance calculations, and analysis of utility bills, operating schedules, and HVAC system performance. Our UA Local 250 journeymen meticulously assess air handlers, chillers, boilers, cooling towers, and control systems to pinpoint inefficiencies. This depth of analysis is critical for developing a strategic plan that not only meets EBEWE's stringent reduction targets but also optimizes long-term operational costs and enhances overall building performance within the demanding Southern California climate.

Implementing EUI Reduction Strategies: Retro-commissioning & VFD Retrofits

To effectively reduce EUI by the mandated 15% under EBEWE, facility managers must look beyond simple fixes. Retro-commissioning (RCx) is a cornerstone strategy, systematically identifying and correcting operational deficiencies in existing building systems that have drifted from optimal performance over time. This process involves verifying control sequences, calibrating sensors, optimizing setpoints, and ensuring proper interaction between various mechanical components. RCx can often yield significant energy savings with minimal capital expenditure, making it a highly attractive EBEWE compliance pathway.

Another high-impact strategy involves the strategic retrofit of Variable Frequency Drives (VFDs) onto constant-speed motors in HVAC systems, such as those driving chiller pumps, cooling tower fans, and air handling unit fans. In Southern California's variable climate, VFDs allow motors to operate at speeds precisely matched to current load demands, dramatically reducing power consumption compared to full-speed operation. Our expert installation ensures proper sizing, integration with existing BMS, and adherence to IEEE 519-2014 for harmonic mitigation, maximizing energy savings and extending equipment lifespan.

Advanced Water Efficiency: Cooling Tower Sub-metering & Optimization

EBEWE also places significant emphasis on water efficiency, especially critical in drought-prone Southern California. Cooling towers, being major water consumers in large commercial buildings, are a prime target for WUI reduction. Implementing dedicated sub-meters for cooling tower makeup water allows for precise tracking of consumption, identifying leaks, excessive blowdown, or inefficient cycles. This granular data is invaluable for developing targeted water conservation strategies and demonstrating compliance with EBEWE's water reduction mandates.

Beyond sub-metering, Western Mechanical, Inc. implements advanced cooling tower optimization techniques. This includes optimizing blowdown cycles based on water quality analysis, installing efficient drift eliminators, and ensuring proper chemical treatment to minimize scaling and corrosion, thereby extending component life and reducing water waste. Our UA Local 250 technicians also verify proper fan operation and water distribution, ensuring the cooling tower operates at peak efficiency to support chiller performance while minimizing its water footprint, directly contributing to EBEWE compliance and operational sustainability.

UA Local 250 Certified Field Diagnostic & Commissioning Protocol

Perform ASHRAE Level II energy audit, verifying all major HVAC components against design specifications and operational logs.
Calibrate and verify accuracy of cooling tower makeup water sub-meters (AWWA C700/C708) and integrate data into EBEWE reporting platform.
Conduct retro-commissioning of air handling units, optimizing fan speeds, damper positions, and control sequences for EUI reduction.
Install and commission Variable Frequency Drives (VFDs) on chiller pumps and cooling tower fans, ensuring IEEE 519 compliance for harmonics.
Validate chiller plant efficiency (kW/ton) under various load conditions, comparing actual performance against manufacturer specifications and EBEWE targets.

Facility Director & Chief Engineer FAQs

What is the primary goal of the LA EBEWE Ordinance for commercial buildings?