Critic. WE Credit Code WEp1 WEp2 WEp3 WEc1 WEc2 WEc3 WEc4 WEc4.1 WEc5. Possible credit Required. Credit Title. metering Enhanced Enhanced

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Merilyn Allen
5 years ago
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1 Water Efficiency 26 Critic Arlington is located in the Chesapeake Bay Watershed area and uses a sanitary sewer system to carry wastewater from buildings to the treatment facility. In order to reduce loads from the system, water efficiency is important. Currently LEED is focused on reducing the water use, but lesss involved with how to deal with problems in leakage or with what to do with the water after it is used. Suggestion Provide extra suggestions from BCA Green Mark, Singapore and BEAM, Hong Kong to try to limit the usage of water from leaks, as well as recycling gray water for toilet flushing and irrigation to reducee the loads on the sewage system. WE Credit Code WEp1 WEp2 WEp3 WEc1 WEc2 WEc3 WEc4 WEc4.1 WEc5 Water Efficiency Credit Title Outdoor water use reduction Indoor water use reduction Building-level water metering Enhanced Outdoor water use reduction Enhanced Indoor water use reduction Cooling tower water use Water metering Water usage and Leak Detection 36 Water Recycling 37 Possible credit BCA Green Mark.1, Building and Construction Authority, January, 2013, P15 BEAM v1.2, HKGBC, August, 2011, P15

2 New Construction l v Outdoor water use reduction WEp1 l Indoor water use reduction WEp2 l use metering Building-level water WEc1 l Enhanced Outdoor water WEc2 l use reduction Cooling tower water WEc3 l use Water Metering WEc4 l

3 28 New Construction l v1.0 Water Usage and Leak Detectio WEc4..1 l Adapted from BCA Green Mark on 38 Intent Promote the use of sub-metering and leak detection system for better control and monitoring. Requirements Provide private meters to monitor the major water usage such as irrigation, cooling tower and tenants usage, as well as link all private meters to a Building Management System (BMS). Rationale While LEED addresses water metering, as well as sub-metering, it is only implied that it could be used for leak detection. This credit ensures that the building management is involved and aware in the water use as well as any discrepancies that could mean leakages and fix them as soon as possible. 38 BCA Green Mark.1, Building and Construction Authority, January, 2013, P15

4 29 New Construction l v1.0 Water Recyclin WEc5 l Possible 1 point Adapted from BEAM v1.2 ng 39 Intent Encourage harvesting of rainwater and recycling of grey water in order to reduce consumption of fresh water. Requirements The Client shall provide a detailed report on the system or systems installed for the purpose of recycling gray water, the details of the expectations in respect of savings in the consumption of potable water and shall demonstrate that the treated gray water is of a quality appropriate to the end use. The condensed water shall be included in the calculation of recycled gray water. Where it can be demonstrated that the expected savings in fresh water use will be 5% or more based on baseline building estimation, the credit shall be awarded. The recycled gray water will only be used for toilet flushing and irrigation, and not recycled to be potable water. Rationale LEED currently does not use its innovate wastewater technologies credit anymore because of uncertainties to whether or not recycled gray water is safe to drink. However, recycling gray water is still a reasonablee way to save water. Because Arlington is in the Chesapeake Bay watershed, it is important to reduce the flow to the sewers to prevent pollutants from running into the river. 39 BEAM v1.2, HKGBC, August, 2011, P15

Energy Part in LEED rating system 30 Critic Especially energy credits in LEED are categorized very superficially, since there are several guidelines

For the easier understanding and application by the public users, those credit categories need to be divided more detail to suggest the specific way to

In the meantime, the post occupancy monitoring and reporting of building performance to reduce a gap between proposed and measured data should be

Suggestion To provide more specific and reasonable guideline, the categories need to be reorganized as following the strategies of building energy

The building orientation, the performance of building envelope, and the maximization of passive heating and cooling with natural light and natural

Also the application of sensor and controls to building system is the additional way of saving energy.

5 Energy Part in LEED rating system 30 Critic Especially energy credits in LEED are categorized very superficially, since there are several guidelines embedded which are provided from ASHRAE, U..S. DOE, etc. For the easier understanding and application by the public users, those credit categories need to be divided more detail to suggest the specific way to improve the energy efficiency. In the meantime, the post occupancy monitoring and reporting of building performance to reduce a gap between proposed and measured data should be connected to the method to improve the building system and adjust the awarded credit score if necessary. Suggestion To provide more specific and reasonable guideline, the categories need to be reorganized as following the strategies of building energy performance. As shown in Figure 8, reducing the energy demand of building is the basic and most effective strategies. The building orientation, the performance of building envelope, and the maximization of passive heating and cooling with natural light and natural ventilation are able to be categorized under this. The next step is to improve the energy efficiency of building systems and appliances. Also the application of sensor and controls to building system is the additional way of saving energy. Lastly, process of metering and reporting building performance need to be connected to the education of building users for their participation in energy saving. Also even thesee suggestions are made for the green rating system of Arlingtonn VA, most of these issues can be broadly applied to other regions except the region with the extreme climate condition. Figure 8 Pyramid of strategies for building energy performance, The Pearl Rating System for Estidama, Building Rating System Design & Construction, Version 1.0, April 2010, p139

6 31 E Energy Credit Code Credit Title Ep1 Minimum energy performance Ep2 Fundamental energy metering and monitoring Possible credit Ec1 Ec2 Ec3 Ec4 Ec5 Ec6 Ec7 Optimize energy performance- to reduce demand Ec1.1 The building orientation Ec1.2 The building envelope, opaque Ec1.3 The building envelope, performance of window glazing and frames Ec1.4 The building envelope, shading devices and window ratio Ec1.5 Maximize the natural ventilation Ec1.6 Maximize the natural lighting Optimize energy performance- to improve energy efficiency and control Ec2.1 Application of ENERGY STAR 40 products Ec2.2 Application of occupancy sensors and task controls for building systems Renewable energy production Advanced energy monitoring, reporting, and educating users Improving energy performance after occupancy Peak Load Reduction Enhanced Commissioning Possible 3 points Possible 5 points Possible 3 points Possible -10 points 40

2013, A1, LEED,

2013, A1, LEED, 32 Minimum energy performance Ep1 l Required Same as LEED v4 33 Fundamental energy metering and monitoring Ep2 l Required Similar with LEED v4 (especially faded contents), added more specific categories