1Taylor Engineering, LLC Group Think Mark Hydeman, P.E., FASHRAE Taylor Engineering, LLC

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Presentation transcript:

1Taylor Engineering, LLC Group Think Mark Hydeman, P.E., FASHRAE Taylor Engineering, LLC

2Taylor Engineering, LLC Scenario New four story classroom and office building with:  Water-cooled chilled water plant with 2 each chillers, towers CHW pumps and CW pumps. All components have VSDs so they are efficient at part-load.  Central built up VAV air handling unit with 2 supply fans, 6 relief fans and air-side economizer.  PBX rooms on each floors located near the shaft.  Small data center on the first floor (3,000 ft2 <100w/sf). The PBX rooms and data center need 24X7 cooling, the rest of the space operates ~3,000 hrs/yr.

3Taylor Engineering, LLC Design options 1. VAV boxes from the central AHU 2. Dedicated CHW fan coils 3. Dedicated split-system air-cooled DX units 4. Dedicated water-cooled DX units As a group consider the following design alternatives for serving the PBX rooms and data center:

4Taylor Engineering, LLC Chilled Water Plant

5Taylor Engineering, LLC 1: Variable Air Volume with Reheat Data Center or PBX room

6Taylor Engineering, LLC 2. Chilled Water CRAC Units 2-WAY! CHWS&R to chillers on roof

7Taylor Engineering, LLC 3. Split System Air Cooled CRAC Units

8Taylor Engineering, LLC 4: Water Cooled CRAC Heat exchanger connected to cooling towers at central plant on roof

9Taylor Engineering, LLC Consider the following attributes Energy First cost Maintenance impact Spatial impact Redundancy and reliability

10Taylor Engineering, LLC Score Sheet Relative importance of attributes Score for that system and attribute Sum of the product of all weights and scores for that system. Higher is better.