Underutilized Technologies

Transcription

1 Underutilized Technologies in Performance Contracting Underutilized Technologies Jeffrey A. Means Department of Veterans Affairs August 16, 2017 Tampa Convention Center Tampa, Florida

2 Underutilized Technologies in ESPC contracts Laboratory Fume Hood VAV conversion OR Ventilation - conversion from 100% Outside Air Combined Energy Savings in excess of $54,104 per year 1 site Combined Energy Savings (3) sites $54,104+$170,960+$48,811 = $273,875 2

3 Lab Fume Hood VAV conversions Design elements (primary) General use fume hoods ducted into a common header. Single set of Strobic Fans with N+1 requirement Eliminated approximately 30 independent constant volume fan/motor sets Hoods modified to allow the sash to close to nearly 100% Integrate Fume hood volume with room supply air volume and room exhaust volume Maintain room pressurization 3

4 Lab Fume Hoods VAV conversion Function The fume hoods were retrofitted with Venturi valves sash position sensors and modified to allow for laminar flow when closed 100%. Room Supply air and Exhaust air ducts were retrofitted with Venturi Valves As fume hood opens room supply air increases and room exhaust air decreases As fume hood closes room supply air drops and room exhaust air increases (net air flow drops to minimums) Balance point is a differential between net supply air and net exhaust air where you add room hood(s) plus room general exhaust 4

5 Lab Fume Hood Fume hood Modified with sash position sensor and to allow proper laminar flow when closed Room supply and general exhaust modified with Venturi Valves Fume hood Exhaust, Room Supply air, and Room General Exhaust, are all interconnected through controls to maintain proper air flow differential to ensure proper room pressurization under all conditions. 5

6 Lab Fume Hood system elements Multiple open positions where fan/motor sets used to be. Strobic fans, giving us N+1 redundancy replaced approximately 30 fan/motor sets for general exhaust fume hoods Venturi valves replaced existing VAV boxes for supply and return lines and as shown they were installed on the exhaust duct for each fume hood 6

7 Lab Fume Hoods VAV conversion Benefits Being able to fully close Fume hoods allows for a dramatic reduction in the amount of air exhausted from our lab spaces Less air being exhausted also requires less air to be supplied. AHU slows down and heating/cooling loads on the facility are reduced Continuous air monitoring with integrated controls has a net improvement on air quality and staff safety. 7

8 OR Ventilation conversion from 100% outside air Background VA used to require 100% outside air for our Operating rooms VA now follows ASHRAE which allows up to 80% recirculated air with HEPA filtration Design elements (primary) Capture room exhaust and duct it to the AHU for return air Install HEPA filtration Generally terminal to avoid the need for too much stainless steel ductwork 8

9 OR Ventilation conversion from 100% outside air Design elements (continued) Create separate exhaust system for areas and spaces which require 100% exhaust Med Gas storage Soiled utility We ended up with less than 80% RA due to volume of dedicated exhaust. Replace VAV boxes with Venturi Valves for more precise air flow and room pressurization controls 9

10 OR Ventilation conversion from 100% outside air Design Elements included - Genesis Air system - Kills 95% + of all biologicals in the air stream - Optinet Air Monitoring - Monitors air quality near real time 24/7/365 - Controls programmed to modify air streams (OA vs RA) to automatically improve air quality when needed - Meets all updated JCAHO standards for healthcare - SAS Shield - Non-chemical Based surface treatment - Kills all gram negative biologicals on contact - (per infection control, most pathogens that the OR is concerned with are gram negative) 10

11 OR system elements AHU previously dedicated to 100% exhaust now serves as the RA fan Venturi valves for OR suite air distribution Ductwork added tying old exhaust to or AHU which is below the mezzanine shown in this picture includes control dampers to properly direct and control volume of Return air versus Exhaust air. 11

12 OR s and Labs Energy and Economics Total Energy Savings at 3 sites 19,587 MMbtu/yr 1,587,288 kwh Electric 9,157 MMbtu Steam 5,014 MMbtu Nat Gas $273,875 /yr All utilities savings included Small amount of water savings was also realized 12

13 OR s and Labs additional benefits Labs Continuous air monitoring Optinet Improved differential pressure control Venturi Air valves Improved Staff safety Optinet and integrated controls Air volume overrides when high levels of VOC s detected in the occupied space flood space with air (max supply, max exhaust) in order to ventilate during spills and rapidly improve air quality for affected staff 13

14 OR s and Labs additional benefits OR s Cleaner/safer supply air HEPA filtration Genesis 95% + all biologicals killed prior to filtration Continuous air monitoring Optinet Improved differential pressure control Venturi Air valves Higher level of biological safety on surfaces SAS Shield 14

15 Underutilized Technologies in Performance Contracting 15