on-demand Minimizing Energy Loss through order to meet Sustainable Design Standards

Transcription

1 Venting- on-demand Minimizing Energy Loss through the Exhaust Ventilation Systems in order to meet Sustainable Design Standards

2 Approach Controlled Venting Versus Natural Venting Controlled Air Supply Versus Natural Air Supply Combined Venting Versus Individual Venting = Sustainable Designs

3 Design Objectives Aesthetical Environmentally Friendly Design Space Saving Economical Reliable

4 Applications Sports Arenas Apartments / Condominiums Hotels / Resorts Offices Hospitals Schools Colleges Museums

5 Boiler Exhaust What? Central Plants / mechanical rooms Multistory heating appliance systems How? Mechanical Draft Systems Modulating Over-draft Damper Systems Modulating Combustion Air Supply

6 Clothes Dryer Exhaust What? Central Laundry Facility Coin-Laundry Facilities How? Modulating Dryer Venting Systems Modulating Combustion Air Supply

7 Clothes Dryer Exhaust What? Multistory dryer systems How? Modulating Dryer Vent Systems

8 Kitchen & Bathroom Exhaust What? Multistory kitchen ventilation systems Multistory bathroom ventilation systems How? Modulating Building Exhaust Systems

9 Fireplace Exhaust What? Multistory gas-fireplace venting systems How? Mechanical Draft Systems

10 Boiler Efficiency versus Draft

11 Invisible Exhaust US Capitol Washington, DC Aesthetical A natural draft chimney must terminate at least 3 feet above anything within 10 feet. The Hemisphere, Ft. Lauderdale, FL Rigel, South San Francisco, CA

12 Minimal Design Restrictions Design A chimney must be designed with as few changes of directions as possible and the shortest possible distance to the outside

13 Minimize Stack Shaft The Getty Museum Los Angeles, CA Soldier Field Chicago, IL Space Saving A chimney must be designed for the maximum input of all the heating appliances it serves. A naturally vented heating appliances should be vented by its own chimney. Spurs Arena San Antonio, TX

14 Mechanical Draft System

15 Mechanical Draft System

16 Modulating Over-draft Control MDF

17 Green Building Design Modular venting design reduces the overall venting material cost per boiler. Down-sized chimney often pays for the Mechanical Draft System A boiler s actual operating efficiency can increase by 5-20% when an On- Demand Mechanical Draft System is used. Economical

18 Green Building Design Economical Boiler Capacity Efficiency Rating Efficiency Loss % Efficiency Loss 3,000 MBtu/Hrs 85% 35% 3.5% 15Therm/Hrs 1.5 $ 9,000 Efficiency Loss per Year In $ (*) 6,000 MBtu/Hrs 85% 6.0% 2.9 Therm/Hrs $ 17,400 10,000 Mbtu/Hrs 85% 8.0% 9.5 Therm/Hrs $ 57,000 Unit Price: $ 1.20 per Therm Running Time: 5,000 Hours per Year

19 First Cost Analysis Ordinary Stack Material Cost Economical EXHAUSTO System Material Cost Item Qty List Price Item Qty List Price 20" pressure stack 35' $ 5,775 12" pressure stack 50' $ 4,600 16" pressure stack 5' $ " Tee 1 $ " pressure stack 5' $ " end cap 2 $ " pressure stack 5' $ " x 8" reducing Tee 4 $ 1,240 20" Tee 1 $ " end cap 1 $ " x 8" reducing Tee 1 $ " x 16" tapered reducer 1 $ " x 8" reducing Tee 1 $ " x 14" tapered reducer 1 $ " x 8" reducing Tee 1 $ " x 10" tapered reducer 1 $ " x 8" reducing Tee 1 $ " end cap 1 $ " stack cap 1 $ 640 Total $ 11,210 Total $ 6,445

20 Quality Components Reliable Source: NEMA

21 Typical Building Exhaust System Individually vented or power-vented Common Power Vented

22 Building Exhaust Requirements IBC Penetration of Shafts 22 subduct Exhaust fan at upper Exhaust fan at upper terminus, powered continuously to maintain upward airflow to the outside Must run 24/7

23 Building Exhaust Requirement Eliminates the need for fire and smoke dampers

24 Powered Dryer Vent Systems Multiple Termination DEDPV (Dryer Exhaust Duct Power Ventilator) venting multiple Type 1 or 2 clothes dryers

25 Dryer Exhaust Fan ETL Listed to UL705 :"The product (BESB/MDVS) covered by this report is a modulating air exhaust system. The product consists of a box ventilator and a modulating control for permanent installation. ti Its intended d use is exhausting of lint-laden air from single or multiple type I and type II residential and commercial clothes dryers.

26 Powered Multi-Story Exhaust Systems Make-up Air #2 Corridor Pressurization + Bottom Make-Up + Direct-Ducted Make-Up. Recommended method for apartment buildings. You can get 60 CFM under a smoke-rated corridor door per NFPA 105 and 50 CFM via a louver. Disadvantages: Larger Rooftop unit and more energy cost Larger corridor supply shafts, the cost of duct running in the corridor of every floor. Large, bulky make-up ducts on the lower floor that connect to the bottom of each stack Source: ASHRAE report

27 Powered Multi-Story Exhaust Systems Exhaust and Make-up Air #4 Corridor Pressurization + Variable Speed Exhaust. This method uses no bottom make-up, no top make-up, and no direct-ducted supply through the corridor. It uses a variable speed motor to vary the fan speed to match a pressure sensor in the stack. The sensor is very sensitive and can slow the fan down to 3% flow. Disadvantages: The system is $2,500-3, more per fan system than a 'regular' exhaust fan. This system is always less expensive in operation than system stem #2. Source: ASHRAE report

28 Green Building Design The goal is energy savings LEED points Economical

29 Green Building Design Test result from 2-year test by Enbridge Gas, Toronto, and NGTC, National Gas Technology Centre, Montreal Economical Conditioned Air Savings (cuft/day) Laundry Utilization Profile Conditioned Air Loss to the Outside (cuft/day/dryer % Dryers in Laundry Profile Laundry Profile Operation (%/day) (min/day) MDVS Fixed Speed Savings ,318 1, ,550 4,356 1, ,739 10,793 7, ,308 21,656 16, , ,830 98,768 TOTAL 100 1,440 19, , ,080 1 Therm = 100 cuft of gas Cost per unit - $ Annual savings when using variable speed Annual savings per dryer Lost Heating: m3 gas/year 3, cuft/year 134, , Lost Cooling: kwh/year 2, TOTAL ANNUAL SAVINGS - $ 1, Savings per bathroom Bathroom exhaust savings should equal 50% of dryer savings. Each bathroom fan exhausts 100 cfm compared to a dryer's 200 cfm. 238

30 Example Garlands of Barrington Units Savings per unit Annual Savings Dryers 70 $476 $33, Bathrooms 225 $238 $53,550 Estimated Annual Savings - Total $86,870 Fan Savings $25,900 The Bottom Line Savings of $112,000 per year Additional installation ti cost of approx. $100, Payback: 1 year.

31 Americana Glendale, CA 140+ MDVS and MBES systems serving dryers 140 MDVS and MBES systems serving dryers, kitchens and bathrooms.

32 On-Demand Control The key to optimal performance is an efficient control design EXHAUSTO Other

33 On-Demand Control Effects of inefficient control design System start-up can be delayed. Boiler operation can be effected by control interference The appliance sees varying draft or pressure Small operating variances create large control variances Safety functions are delayed to eliminate nuisance shutdowns. Inefficient dyer operation Noise problem due to hunting fan in kitchen and bathroom exhaust systems

34 Responsibility Reduce Emissions Environmentally friendly Low Energy Recyclable Materials Demand-Controlled = LEED Points

35 Next Step.. What is Your Strategy for Minimizing Energy Loss through Exhaust Ventilation Systems in Order to Meet Sustainable Design Standards?