# Presentation: 270977

## Introduction to Integrated Chiller Retrofits

**Dr. Lisa Gartland**
**(510) 595-7674, positivenergy@california.com**

## Why an Integrated Chiller & Building Retrofit?

**Turn the necessity of  coping with CFC phaseouts into an ****opportunity**** for**
**Energy & Cost Savings**
**More Efficient Building Operations**
**Improved Environmental Sustainability**
**Increased Comfort and Productivity**
**Increased Asset Value**

## What is an Integrated Chiller & Building Retrofit?

**Combines **
**building system and load improvements/retrofits **
**chiller replacement or retrofit for CFC conversion**
**Systems approach for comprehensive building analysis **
**solves building problems**
**saves energy and money**
**finances chiller replacement with other measures**
**deals with CFC issues**
**avoids lost opportunities**

## Steps to an Integrated Approach

**Find operations & maintenance opportunities**
**Look for building load reductions**
**Use low or no-energy HVAC systems**
**Introduce high-efficiency equipment**
**Improve control systems**
**Properly commission the systems**

## Operation & Maintenance Opportunities

**Audit to find efficiency opportunities**
**Check equipment condition and function**
**Evaluate operating schedules **
**Evaluate temperature setpoints**
**Evaluate problems**
**Typical energy savings due to O&M improvements is ****10% or more**

## Reduce Building Loads

**Building envelope**
**insulation, glazing, outside surface reflectivities**
**Lighting loads**
**high efficiency lighting, daylighting, controls**
**Plug loads**
**appliances and their use schedules**
**Watch out for load assumptions**
**measure, don’t assume!**

## Low or No-Energy HVAC Systems

**Cooling with economizers**
**Direct & indirect  evaporative cooling**
**Heat recovery**
**Natural ventilation**
**Thermal Storage**

## High Efficiency HVAC Equipment

**Energy-efficient equipment**
**Variable Speed Drives**
**Coils**
**Motors**
**Low kW/ton chillers**
**Avoid oversizing equipment!!**
**especially chillers**
**saves initial and lifetime costs**

## Improve Control Systems

**Must be properly commissioned      and used**
**Get training over an extended          time period**
**Get manuals specific to your      system**
**Periodically re-evaluate use of    control systems**

## Commission the Systems

**Save time, energy, aggravation, and even litigation over the building lifetime**
**Pre-functional testing**
**Functional testing of systems**
**Training, manuals**
**Re-commission older systems if needed**

## Chicago Office Building ExampleProject Context

**CFC refrigerants in existing chillers**
**Desire to reduce utility bills**
**Comfort complaints, “not enough air”**
**Perceived need to purchase new 200 ton chiller**

**203 North LaSalle Street**
**Project Team:**
**Sieben Energy Associates, E-Cube,**
**M&J Wilkow, ComEd**

## Chicago Office Building ExampleProject Steps

**Audit**
**Implementation**
**low & no-cost measures implemented first**
**Results**
**Operational**
**Financial**
**Non-financial**

## Chicago Office Building ExampleBuilding Load and System Improvements

**Even without chiller replacement**
**Air supply problems resolved**
**Reduced chiller operation**
**Hot and cold complaints minimized**

## Chicago Office Building ExampleFuture Opportunities

**No supplemental chiller needed**
**Avoided costs of $200,000 by making building load and system improvements**
**Potential to reduce chiller capacity in combination with building retrofits**
**Replacement and/or retrofit of chiller for CFC compliance**

## Integrated Retrofit Challenges

**Integrated retrofits take more effort than simple chiller retrofits or replacements**
**Extra time needed**
**to study existing conditions**
**to evaluate design options**
**to construct & coordinate systems**
**Extra financing needed**
**more up front capital or more project paperwork and contracts**

## Results of the Integrated Approach

**Energy and money saved from building system and load improvements**
**Smaller chiller needed**
**New, more efficient chillers add to savings**
**Chiller work can be financed by measures with shorter payback periods**
**Building operation and maintenance improved**
**Building comfort and asset value enhanced**