AIR-COOLED LIQUID CHILLERS 30XAV 500-1150
The air conditioning system can use between 30 and 40% of the annual building energy consumption. Selection of the right air conditioning system is one of the main aspects to consider when designing a green building. For buildings with a variable load throughout the year 30XAV units offers a solution to this important challenge. A number of green building certiﬁcation programs exist in the market and offer third-party assessment of green building measures for a wide variety of building types. The following example looks at how Carrier’s new 30XAV range helps customers involved in LEED® building certiﬁcation. 30XAV and LEED® certiﬁcation The LEED® (Leadership in Energy and Environmental Design) green building certiﬁcation programme is a pre-eminent programme to rate the design, construction and operation of green buildings with points assigned in seven credit categories: - Sustainable Sites (SS) - Water Efﬁciency (WE) - Energy & Atmosphere (EA) - Materials & Resources (MR) - Indoor Environmental Quality (IEQ) - Innovation in Design (ID) - Regional Priority (RP). The choice of heating, ventilating and air conditioning (HVAC) products in particular can have a signiﬁcant impact on LEED® certiﬁcation, as the HVAC system directly impacts two categories that together inﬂuence 40% of the available points.
Overview of LEED® for new construction and major renovations
Water efficiency (10 points) Regional priority (4 points) Sustainable site (25 points) Energy & atmosphere (35 points) HVAC contribution 26 of 35 points
Innovation & design process (6 points) Indoor environmental quality (15 points) HVAC contribution 6 of 15 points
Material & Resources (14 points)
The new 30XAV units from Carrier can assist building owners to earn LEED® points in particular in the Energy & Atmosphere (EA) credit category and help address the following prerequisites and credit requirements: EA prerequisite 2: Minimum energy Performance The 30XAV exceeds the energy efﬁciency requirements of ASHRAE 90,1-2007; therefore it complies with the presequisite standard. EA prerequisite 3: Fundamental Refrigerant Management The 30XAV does not use chloroﬂuorocarbon (CFC) refrigerants thus satisfying the prerequisite statement. EA credit 1: Optimise energy performance (1 to 19 points) Points for this credit are assigned depending on the energy cost reduction virtually achievable by the new building, compared to ASHRAE 90,1-2007 reference. The 30XAV, which is designed for high performance especially during part load operation, contributes reducing the energy consumption of the building and therefore helps gaining points within this credit. In addition, the Carrier HAP (Hourly Analyses Program) can be used as an energy analyses program complying with the modeling requirements for this credit and produce reports that are easily transferable to LEED® templates. EA credit 4: Enhanced refrigerant management (2 points) With this credit, LEED® awards systems that minimise the Ozone Depletion Potential (ODP) and Globlal Warming Potential (GWP) of the system. The 30XAV uses a reduced R134a charge and therefore contributes toward satisfying this credit under LEED®.
There are a number of different LEED® products.
While the strategies and categories assessed remain same, the point distribution varies to address different building types and application needs, for example according to New Construction, Schools, Core & Shell, Retail and Healthcare. All programmes now use the same point scale:
110 Possible LEED® points
80-110 points Platinum 60-79 points Gold 50-59 points Silver 40-49 points Certified
The majority of credits in LEED® rating systems are performance-based and achieving them is dependent on the impacts of each component or sub-system to the overall building. While the LEED® green building certiﬁcation programs do not certify products or services, the selection of the right products, systems or service programs is critical to obtain LEED® certiﬁcation for a registered project,