HVAC Assessment Survey_Seattle - SOW.docx

Seattle Division Scope of Work

Project number: 663-25-900 Study for HVAC System Improvement, Seattle WA This A/E shall assess, test and evaluate the existing HVAC system, its associated equipment and the spaces they serve for 7 buildings (Building 1, 31, 33, 100, 101, 102 & 103) at the VA Puget Sound Campus to identify HVAC system deficiencies and provide recommendations for any replacement, repairs, resizing, and/or upgrades required to correct these deficiencies to make the facility in compliance with VA Standards & Codes.

The project area is the VA Puget Sound Campus located at 1660 S Columbian Way, Seattle, WA 98108. The A/E shall provide all labor, materials and equipment for the inspection needed to complete the project. The report and recommendations shall meet all VA Standards and Codes, and all applicable local, state, and federal codes.

The objectives of this engineering study are as follows:

· Perform a detailed inspection and evaluation of each building’s dedicated air handling systems to identify their existing conditions (air changes per hour, comfort level, temperature, and humidity). Associated HVAC equipment includes ductwork, related plumbing, related steam & condensate lines, related chilled water piping, BAS control system, exhaust and return fans, VAV boxes and heat exchangers. Consider the following factors:

· Capacity

· Cooling & Heating Loads

· Age of the system

· Remaining useful service life

· Physical condition of system

· Accessibility for maintenance operations and repairs.

· Existing electrical panel and available capacity.

· Other Considerations

· Provide existing AHUs schedules in a table form and include the following information:

· General (Building No., Equipment Location, Equipment Tag #, Area Served, Replacement Phase, Dual Duct, Air Flow Design, Unit Overall Condition, Year of Installation)

· Control (Electronic or Pneumatic)

· Filter (Filter Type, Filter Condition)

· Airflow (Design Supply Air Flow)

· OA Min (CFM, % OA Min)

· Economizer (Economizer’s Overall Condition)

· Supply (Supply Fan Motor HP, Supply fan VFD, VFD Brand, Supply Fan VFD Overall Conditions)

· Review each building’s HVAC system layout and assess if the existing state of the air handling unit system is meeting the airflow (Air Changes/CFM), environmental (temperature, humidity levels, pressure), outside air (OA) and filtration requirements as outlined in the HVAC Design Manual and VA Design Guides. Supplement these assessments with the following calculations & reports:

· Cooling/Heating Load Calculations

· Steam/Chilled Water Supply & Demand Calculations

· TAB Reports

· Condensation drain capacity Calculations

· Identify HVAC system deficiencies for each building and consider the following:

· Unused system capacities

· Potential incompatibility of existing control systems and impact.

· Capacity and life cycle of existing steam systems.

· Impact to maintenance operations and HVAC system shutdowns (i.e. lack of redundancy, lack of isolation valves).

· If non-compliant with the VA TIL, Standards Codes and PSRDM requirements, specify which standard or code in question.

· Provide recommendations that detail the HVAC system deficiencies identified and describes the work that would be involved to correct these deficiencies.

Additionally, consider the following:

· Identify if the work required would be considered either a replacement, upgrade, or a renovation to the air handling system.

· If there is a possibility for redundancy N+1?

· If resizing of the air handling system would be needed. Provide the sizing, new capacity and potential installation locations that would be required.

· Identify if the associated work would require electrical, chilled water or steam system upgrades to support the recommended changes to the air handler system.

· Identify if temporary construction would be needed to perform the outlined work (i.e. temporary setup for temporary air handler units, power, location etc.) and provide a detailed plan.

· Identify the feasibility of implementing energy efficiency strategies to each building’s air handling system (i.e. restructuring of ducting, reducing number of air handling units etc.).

· Propose if the existing air handler systems can be broken down into smaller dedicated air handler units.

· Propose isolation valve locations.

· Identify challenges and risks associated with correcting these HVAC system deficiencies such as capacity limitations with the building’s electrical and/or steam distribution system and if any deviations from the VA Design Guides and/or Manuals would be required to complete the associated work. Once identified, provide recommendations to mitigate these risks.

Additionally, consider the following known site challenges:

· Lack of redundancy in steam/chill water/condensation piping and provide recommendations on the approach to replacing these components.

· Minimizing disruption to clinical operations and ongoing patient care.

· Limitation in potential construction laydown spaces.

· Prior Design conflicts with the following PSRDM and HVAC Design Manual Sections:

· PSRDM Section 6.6.1 Penthouses & Screen Walls

· HVAC Design Manual, Section 3.2.1.4 Rooftop AHU’s

· Provide a phasing plan and detailed cost estimate associated with correcting these HVAC system deficiencies at each phase.

· Compile an inventory of the existing as-built drawings and available facility documentation. Wherein information is lacking, provide a description of recommended investigations.

All work is to be performed during normal operational business hours. Work performed outside daily operating hours must be approved by the Contracting Officer 14-days prior to the intended scheduled off-hour work commencing.

As-built drawings may not accurately reflect existing conditions and must be verified through actual site inspection of the existing space.

Provided recommendations based on analysis shall follow all VA guidelines & requirements, Design & Construction Procedures and Design Manuals indicated in the VA Puget Sound Health Care System. The following references, as a minimum, shall be utilized. The A/E shall retrieve all items from the VA’s Technical Information Library at http://www.cfm.va.gov/TIL/ or from the COR:

There will be three official deliverable reviews for this project: one at 35% completion of the HVAC Assessment and Survey, one at 65% completion, and one at 95% completion. Intermediate submissions may be required by the VA is any official submission is deemed unacceptable; the decision on whether a submission is acceptable is the sole right of the VA. Any requested intermediate submission materials shall be provided by the A/E at no additional cost to the VA.

The Period of Performance is 6 Months.

Figure 1: VA Puget Sound Healthcare System – Seattle Campus.

VA Puget Sound Health Care System – image1.png