ASHRAE Journal - April 2011 - 42

In post-occupancy reviews with the building owner, there have been very few complaints from building occupants. Both owner and occupants have been very pleased with the performance of the system.

remotely through a wide area network (WAN). A central plant was considered, but determined not to be economic or able to meet the fast construction schedule.

Innovation
The use of innovative air-handling solutions was a primary means to squeeze additional cooling performance from packaged DX equipment. Indirect evaporative cooling and evaporatively cooled condensers were key components of the sustainable design. An EER of 25.8 on the 100% outdoor air (OA) system for Building E proved incredibly cost effective, as a COP of 7.55 is close to the performance of many water cooled chillers at full load. Several factors proved key to achieving this EER, including an efficient wet media on the indirect evaporative cooler, and more importantly, the key innovation of placing the condenser in the saturated exhaust side of the indirect evaporative cooler.

Cost Effectiveness
The incremental capital cost of the energy efficiency measures was approximately $433,800 and the associated annual energy savings is $99,903. A PG&E Savings-By-Design owner incentive of $144,415 was obtained for the project. The total replacement cost every 20 years of the incremental systems is approximately $245,236. Assuming a straight-line depreciation at $12,262/ year, the simple payback for the systems is 3.3 years.

Environmental Impact
The air handlers have been specified with R-410A, which is not a CFC and is non-ozone depleting. Using evaporative cooling for a significant portion of the cooling requirement reduces the energy consumption and use of fossil fuels or non-renewable resources. The PV panels and solar hot water systems use completely renewable and non-polluting resources. Annually, the blend of renewables and energy efficiency is estimated to prevent 1.3 million pounds of CO2 from entering the atmosphere every year (using the Comprehensive Air Quality Model with Extensions [CAMx] estimates for electricity CO2 mix).

Operations and Maintenance
The evaporative condenser and IEC units use a chemical free water treatment system that requires very low maintenance, and also reduces blowdown of water. The building management system (BAS) enabled the county to monitor the system

www.info.hotims.com/33863-42

42

ASHRAE Journal

April 2011



ASHRAE Journal - April 2011

Table of Contents for the Digital Edition of ASHRAE Journal - April 2011

ASHRAE Journal - April 2011
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Making the Case for Energy Metering
BIM Test at ASHRAE HQ
Technology Award Case Studies: Adaptive Reuse for Clinics
Earthquake: New Codes Provide Tools, But We Need to Ensure Compliance
Controlling Corrosion in Marine Refrigeration Systems
Solar NZEB Project
Emerging Technologies
IAQ Applications
Washington Report
Products
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - April 2011 - Intro
ASHRAE Journal - April 2011 - ASHRAE Journal - April 2011
ASHRAE Journal - April 2011 - Cover2
ASHRAE Journal - April 2011 - 1
ASHRAE Journal - April 2011 - 2
ASHRAE Journal - April 2011 - Contents
ASHRAE Journal - April 2011 - Commentary
ASHRAE Journal - April 2011 - 5
ASHRAE Journal - April 2011 - Industry News
ASHRAE Journal - April 2011 - 7
ASHRAE Journal - April 2011 - 8
ASHRAE Journal - April 2011 - 9
ASHRAE Journal - April 2011 - 10
ASHRAE Journal - April 2011 - 11
ASHRAE Journal - April 2011 - 12
ASHRAE Journal - April 2011 - 13
ASHRAE Journal - April 2011 - 14
ASHRAE Journal - April 2011 - 15
ASHRAE Journal - April 2011 - Letters
ASHRAE Journal - April 2011 - 17a
ASHRAE Journal - April 2011 - 17b
ASHRAE Journal - April 2011 - 17
ASHRAE Journal - April 2011 - Meetings and Shows
ASHRAE Journal - April 2011 - 19
ASHRAE Journal - April 2011 - Making the Case for Energy Metering
ASHRAE Journal - April 2011 - 21
ASHRAE Journal - April 2011 - 22
ASHRAE Journal - April 2011 - 23
ASHRAE Journal - April 2011 - 24
ASHRAE Journal - April 2011 - 25
ASHRAE Journal - April 2011 - 26
ASHRAE Journal - April 2011 - 27
ASHRAE Journal - April 2011 - BIM Test at ASHRAE HQ
ASHRAE Journal - April 2011 - 29
ASHRAE Journal - April 2011 - 30
ASHRAE Journal - April 2011 - 31
ASHRAE Journal - April 2011 - 32
ASHRAE Journal - April 2011 - 33
ASHRAE Journal - April 2011 - 34
ASHRAE Journal - April 2011 - 35
ASHRAE Journal - April 2011 - 36
ASHRAE Journal - April 2011 - 37
ASHRAE Journal - April 2011 - Technology Award Case Studies: Adaptive Reuse for Clinics
ASHRAE Journal - April 2011 - 39
ASHRAE Journal - April 2011 - 40
ASHRAE Journal - April 2011 - 41
ASHRAE Journal - April 2011 - 42
ASHRAE Journal - April 2011 - 43
ASHRAE Journal - April 2011 - Earthquake: New Codes Provide Tools, But We Need to Ensure Compliance
ASHRAE Journal - April 2011 - 45
ASHRAE Journal - April 2011 - 46
ASHRAE Journal - April 2011 - 47
ASHRAE Journal - April 2011 - 48
ASHRAE Journal - April 2011 - 49
ASHRAE Journal - April 2011 - Controlling Corrosion in Marine Refrigeration Systems
ASHRAE Journal - April 2011 - 51
ASHRAE Journal - April 2011 - 52
ASHRAE Journal - April 2011 - 53
ASHRAE Journal - April 2011 - 54
ASHRAE Journal - April 2011 - 55
ASHRAE Journal - April 2011 - 56
ASHRAE Journal - April 2011 - 57
ASHRAE Journal - April 2011 - 58
ASHRAE Journal - April 2011 - 59
ASHRAE Journal - April 2011 - Solar NZEB Project
ASHRAE Journal - April 2011 - 61
ASHRAE Journal - April 2011 - 62
ASHRAE Journal - April 2011 - 63
ASHRAE Journal - April 2011 - 64
ASHRAE Journal - April 2011 - 65
ASHRAE Journal - April 2011 - Emerging Technologies
ASHRAE Journal - April 2011 - 67
ASHRAE Journal - April 2011 - 68
ASHRAE Journal - April 2011 - 69
ASHRAE Journal - April 2011 - IAQ Applications
ASHRAE Journal - April 2011 - 71
ASHRAE Journal - April 2011 - 72
ASHRAE Journal - April 2011 - 73
ASHRAE Journal - April 2011 - Washington Report
ASHRAE Journal - April 2011 - Products
ASHRAE Journal - April 2011 - Special Products
ASHRAE Journal - April 2011 - Classified Advertising
ASHRAE Journal - April 2011 - 78
ASHRAE Journal - April 2011 - 79
ASHRAE Journal - April 2011 - Advertisers Index
ASHRAE Journal - April 2011 - Cover3
ASHRAE Journal - April 2011 - Cover4
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