Healthcare-v4 WEp2: Indoor water use reduction

  • More than plumbing fixtures to consider

    To meet this prerequisite, teams must design and install plumbing systems using high efficiency indoor plumbing fixtures including lavatory faucets, toilets, urinals, kitchen sinks, and showerheads, and determine how much potable waterWater that meets or exceeds U.S. Environmental Protection Agency drinking water quality standards (or a local equivalent outside the U.S.) and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems. is consumed relative to a LEED baseline case.

    In order to meet the prerequisite, a minimum of 20% savings must be demonstrated.

    The calculation is performed using a calculator developed by USGBC. Teams should become very familiar with the calculator, the information needed to complete it, and the various rules for using it in order to accurately assess performance and demonstrate prerequisite compliance.

    In addition to meeting the 20% performance threshold, teams must select WaterSense labeled fixtures for any fixture type that is eligible for the WaterSense label. Remember that your project must also meet prescriptive requirements for appliances and process waterProcess water is used for industrial processes and building systems such as cooling towers, boilers, and chillers. It can also refer to water used in operational processes, such as dishwashing, clothes washing, and ice making. equipment, including clothes washers, dishwashers, pre-rinse spray valves, ice machines, heat rejection and cooling, cooling towers, and evaporative condensers. 

    What’s New in LEED v4

    • This prerequisite now has criteria for water-using appliances and processes, cooling towers, and evaporative condensers.
    • WaterSense label requirements are now mandatory in the U.S., with local equivalents accepted for projects outside the U.S.
    • USGBC added a new prescriptive compliance path option that requires all fixture rates to be 20% below the specified baseline rates.
    • Duration-based savings from autocontrol faucetsAutocontrol faucets have automatic fixture sensors or metering controls. with sensors or metering controls are no longer allowed, since studies have shown that autocontrol faucets do not produce water savings.
    • Teams can no longer apply nonpotable waterNonpotable water: does not meet EPA's drinking water quality standards and is not approved for human consumption by the state or local authorities having jurisdiction. Water that is unsafe or unpalatable to drink because it contains pollutants, contaminants, minerals, or infective agents. in the prerequisite calculation.

    FAQs

    Is the WaterSense label really required, even if a non-labeled fixture has a comparable flush or flow rate?

    Yes. Any fixture that can be labeled by WaterSense must have the label.

    Not all fixture types can get the WaterSense label. Which fixtures do we need to ensure have the WaterSense label for our project?

    Currently, tank-type toilets, water-using urinals, private lavatory faucets, and showerheads can be WaterSense labeled, so must be labeled for this prerequisite. Aerators and flow restrictors added to private lavatories or showers must also be WaterSense labeled. Tankless toilets (flush-valves), non-water using flush fixtures (waterless urinals, composting toiletsComposting (or Nonwater) toilet systems are dry plumbing fixtures and fittings that contain and treat human waste via microbiological processes.), and public lavatory faucets do not have be WaterSense labeled because no label currently exists for those fixture types.

  • WE Prerequisite 2: Indoor water use reduction

    Intent

    To reduce indoor water consumption.

    Requirements

    Building Water Use

    For the fixtures and fittings listed in Table 1, as applicable to the project scope, reduce aggregate water consumption by 20% from the baseline. Base calculations on the volumes and flow rates shown in Table 1.

    All newly installed toilets, urinals, private lavatory faucets, and showerheads that are eligible for labeling must be WaterSense labeled (or a local equivalent for projects outside the U.S.).

    Table 1. Baseline water consumption of fixtures and fittings

    Commercial Fixtures, Fittings, and Appliances Current Baseline (IP Units) Current Baseline (SI units)
    Water closets (toilets)* 1.6 gallons per flush (gpf) 6 liters per flush (lpf)
    Urinal* 1.0 (gpf) 3.8 lpf
    Public lavatory (restroom) faucet 0.5 gpm at 60 psi all others except private applications 1.9 lpm at 415 kPa, all others except private applications
    Private lavatory faucet* 2.2 gpm at 60 psi 8.3 lpm at 415 kPa
    Kitchen faucet (excluding faucets used exclusively for filling operations) 2.2 gpm at 60 psi 8.3 lpm at 415 kPa
    Showerhead* 2.5 gpm at 80 psi per shower stall 9.5 lpm at 550 kPa per shower stall
    * WaterSense label available for this product type

    gpf = gallons per flush

    gpm = gallons per minute

    psi = pounds per square inch

    lpf = liters per flush

    lpm = liters per minute

    kPa = kilopascals








    Appliance and process water use

    Install appliances, equipment, and processes within the project scope that meet the requirements listed in the tables below .

    Table 2. Standards for appliances

    Appliance Requirement
    Residential clothes washers ENERGY STAR or performance equivalent
    Commercial clothes washers CEE Tier 3A
    Residential dishwashers (standard and compact) ENERGY STAR or performance equivalent
    Prerinse spray valves ≤ 1.3 gpm (4.9 lpm)
    Ice machine ENERGY STAR or performance equivalent and use either air-cooled or closed-loop cooling, such as chilled or condenser water system

    gpm = gallons per minute

    lpm = liters per minute




    Table 3. Standards for processes

    Process Requirement
    Heat rejection and cooling No once-through coolingA once-through (single pass) cooling system is one which water from any source is used to transfer heat from equipment or processes and then discharged. with potable waterWater that meets or exceeds U.S. Environmental Protection Agency drinking water quality standards (or a local equivalent outside the U.S.) and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems. for any equipment or appliances that reject heat
    Cooling towers and evaporative condensers Equip with:

    • makeup water meters
    • conductivity controllers and overflow alarms
    • efficient drift eliminators that reduce drift to maximum of 0.002% of recirculated water volume for counterflow towers and 0.005% of recirculated water flow for cross-flow towers



    In addition, water-consuming appliances, equipment, and processes must meet the requirements listed in Tables 4 and 5.

    Table 4. Standards for appliances

    Kitchen equipment Requirement (IP units) Requirement (SI units)
    Dishwasher Undercounter ≤ 1.6 gal/rack ≤ 6.0 liters/rack
    Stationary, single tank, door ≤ 1.4 gal/rack ≤ 5.3 liters/rack
    Single tank, conveyor ≤ 1.0 gal/rack ≤ 3.8 liters/rack
    Multiple tank, conveyor ≤ 0.9 gal/rack ≤ 3.4liters/rack
    Flight machine ≤ 180 gal/hour ≤ 680 liters/hour
    Food steamer Batch ≤ 6 gal/hour/pan ≤ 23 liters/hour/pan
    Cook-to-order ≤ 10 gal/hour/pan ≤ 38 liters/hour/pan
    Combination oven Countertop or stand ≤ 3.5 gal/hour/pan ≤ 13 liters/hour/pan
    Roll-in ≤ 3.5 gal/hour/pan ≤ 13 liters/hour/pan



    Table 5. Standards for processes

    Process Requirement
    Discharge water temperature tempering Where local requirements limit discharge temperature of fluids into drainage system, use tempering device that runs water only when equipment discharges hot water

    OR

    Provide thermal recovery heat exchanger that cools drained discharge water below code-required maximum discharge temperatures while simultaneously preheating inlet makeup water

    OR

    If fluid is steam condensate, return it to boiler



    Venturi-type flow-through vacuum generators or aspirators Use no device that generates vacuum by means of water flow through device into drain



Letter of Commitment Template

 Use this template to develop a letter from the project owner committing to share whole-building water and energy usage data.

LEED v4 Indoor Water Use Reduction Calculator

Project teams can complete the USGBC Indoor Water Use Reduction Calculator for LEED v4 BD+C and ID+C WE Prerequisite Indoor Water Use Reduction and LEED v4 BD+C and ID+C WE Credit Indoor Water Use Reduction usage-based calculations as well as LEED v4 O+M WE Prerequisite Indoor Water Use Reduction and LEED v4 O+M WE Credit Indoor Water Use Reduction Option 1. 

The calculator includes assumptions for baseline water use. Use the summary tab in the calculator to complete the form in LEED Online.

6 Comments

0
0
Gabriela Crespo CxA, LEED AP BD+C, O+M Revitaliza Consultores
Mar 14 2017
Guest
392 Thumbs Up

Medical Equipment Specification

Project Location: Mexico

Dear all,

We're working on a HC project in Mexico, but we seem to be having trouble complying with what is required for process equipment in table 5 of this pre-req. Would somebody be able to share what equipment or manufacturer was contacted to comply with these requirements?
Thanks!

Post a Reply
0
0
Michael Burton SR Manager, Project Planning Design STERIS
Dec 17 2014
Guest
10 Thumbs Up

water use per instrument tray requirements table

LEED v4 has a table (table 4) on page 58 that stipulates specific numbers of gallons of water allowable to either sterilize or wash in instrument tray. can anyone comment from where these values were derived?

1
4
0
Susan Walter Specifications Director, Populous Jun 05 2015 LEEDuser Expert 22901 Thumbs Up

Michael,

I'm looking at Table 4 and see requirements for Dishwashers that are limited by the rack. I don't see where this is impacting instrument sterilization.

Susan

2
4
0
Michael Burton SR Manager, Project Planning Design, STERIS Jun 08 2015 Guest 10 Thumbs Up

Susan, it's in LEEDv4 BD &C page 58. Table 4. For medical or lab facilities. Listed 3rd on the table is Sterile process washer @ .35 gal/US tray. The lowest product available in the market uses approx. 4 or 5 gallons / US tray. feel free to email me as well. michael_burton@steris.com
thank you.

3
4
0
Susan Walter Specifications Director, Populous Jun 11 2015 LEEDuser Expert 22901 Thumbs Up

Michael,

I am working of the PDF version of the Reference Guide. Page 58 is a blank page! When I go to the credit, Table 4 only lists Dishwasher, Food steamer and Combination oven.

Table 1 is about baseline water consumption, EPA standards.
Table 2 is Appliance water use standards with no mention of sterilizers.
Table 3 is heat rejection and cooling and cooling tower and evap condenser standards.
Table 5 deals with water discharge temperature and vacuum drains.

Are you looking at an older or newer v4 standard?

4
4
0
Michael Burton SR Manager, Project Planning Design, STERIS Jun 11 2015 Guest 10 Thumbs Up

Susan, yes I am using LEED v4. if you would like to provide me your email address I would be happy to send you a screen capture with highlights. seems the page number on your document may not align with mine. I am looking under WE Credit - Indoor Water Use Reduction. Specific to Lab and medical equipment. its the very last portion before WE Credit: Cooling Tower Water Use. Thanks. My email address is michael_burton@steris.com

Post a Reply

Start a new comment thread

Jul 27 2017
Type the characters you see in this picture. (verify using audio)
Type the characters you see in the picture above; if you can't read them, submit the form and a new image will be generated. Not case sensitive.

Copyright 2017 – BuildingGreen, Inc.