Presentation on theme: "Texas Utility Innovations A discussion on HVACs Variable Refrigerant Flow (VRF) Technology & IEER Efficiency Metrics Steve Jones - Southwest Business Unit."— Presentation transcript:
Texas Utility Innovations A discussion on HVACs Variable Refrigerant Flow (VRF) Technology & IEER Efficiency Metrics Steve Jones - Southwest Business Unit Commercial Manager – Mitsubishi Electric Nick Conklin LEED AP, PE, CEM – Application Engineering Manager – Mitsubishi Electric
EEIP Guidelines to Address Why is Ductless Heat Pump (DHP) / Variable Refrigerant Flow (VRF) a Commercially-ready new technology or existing underutilized technology? Overview of the DHP/VRF for EECM(s) – A description of the technology, target market with market potential, and estimated installed/implementation costs Why Verifiable peak demand savings (kW) and/or energy savings (kWh) is achievable? Energy Modeling using IEER metrics Energy Saving Case Studies – Sacramento Drill Tower Measurement and Verification (M&V) – SMUD and PG&E utility savings Applicability in Texas Utility Market SOP MTP What are Texas PUC needs for Energy Efficiency Conservation Measures and/or the Energy Efficiency Goal ? How do we get VRF and IEER metrics in place for utility programs?
US HVAC Industry Overview Commercial/Industrial HVAC Choices: Package Systems Split Systems VRF Systems Light Commercial/Residential HVAC Types: PTACs Unitary Window units Wall-mounted units Radiant Ductless (DHP) *Room AC not included in analysis Source: AHRI and BRSI, September 2012
US Vertical Market Opportunities 31% HVAC Unit Growth Vertical MarketYearMarket Size (Units) Education , ,000 Government/ Military , ,000 Health Care , ,000 Lodging , ,000 Multi-Family , ,000 Office Building , ,000 Source: FMI 2008 U.S. Market Construction Overview
5 Ductless Heat Pumps for Single Zones (30+ Years HVAC Market Success) Highly Efficient 26 SEER 10.6 HSPF No ductwork = No duct losses Individual Room Control Extremely Quiet 19 – 38 dB Cold Climate Capable 100% capacity at 5 F. 82% capacity at -13 F.
VRF for Commercial Buildings Up to 50 indoor units per outdoor 72,000 – 360,000 BTUH Simultaneous heating and cooling Energy reclaim IEER up to 23.9 COP up to 4.87
What is VRF Technology?
INVERTER-driven Compressor Time Room Temperature Enables capacity operation as low as 4% Sizing flexibility with variable capacity Enables long runtimes Reduces compressor cycling Improves temperature control VRF SETPOINT CONVENTIONAL
High Starting Current Traditional HVAC System without Inverter Technology
Building UseOccupant LoadSolar Load Diversity
VRF Heat Recovery Technology Simultaneous cooling and heating
VRF Integrated Controls Easy to install and operate 2-wire DDC (Direct Control) system 16ga stranded and shielded, non-polar Daisy-chain connection Customizable control scheme with web access Individual room controls Color touch screen centralized control Integration into building management system via BACnet ® and Lonworks ® Third-party equipment control Tenant billing capability
VRF Energy-Efficiency and Environmental Impact
Demand Response Tool VRF Integrated Control Systems can allow: Load shedding by automatically reducing compressor frequency/hertz (speed). On/Off Sequencing between zones to minimize temperature discomfort Turn off indoor units in several zones and allow temperature/humidity drift Sequential starting of outdoor units to minimize demand power spikes
LEED NC 3.0 Certified: points Silver: points Gold: points Platinum: 80 + points Energy and Atmosphere: VRF Can achieve up to 21 points Environmental Quality: VRF can achieve up to seven points Utilizing VRF with LEED
Energy and Atmosphere Credits Eac1 – Optimize Energy Usage Total energy usage of building Verified by modeling versus base building EAc5 – Measurement and Verification Verify actual building operation Monitor equipment operation through integrated software
VRF Systems and Energy Modeling Energy usage and cost for VRF systems can be modeled using EnergyPro EnergyPro uses DOE2.1e to model and compare VRF to other HVAC system EnergyPro is approved use with LEED EAc1
EAC1 - Energy Cost Savings VRF Total Energy Cost Savings
Overview of System Standards AHRI 1230 Covers multi-split air conditioners and multi-split heat pumps with distributed refrigerant technology ASHRAE 90.1 Minimum requirements for energy efficient building design Higher standard for VRF system Integration Energy Efficiency Ratio (IEER) in ASHRAE standard 90.1 (July 2012) DOE DOE to reference AHRI 1230 Standard and ASHRAE 90.1 minimum efficiency standards in Code of Federal Regulations part 10, section 431
How IEER Weighting Factors Developed To Develop the four weighting factors for the IEER equation as well as the ambient temperature schedule, a comprehensive model was developed : –Weather Data Model For Cities From 15 US Climate Zones Percentage of Time In The Four Load Bins 100%, 75%, 50%, 25% Average Ambient For Each Load Bin –3 Buildings types – Office (40%), Retail (30%), School (30%) Each building type with its load profile vs. ambient schedule –Sales Volumes Percentage By Each Climate Zones
Sacramento Drill Tower VRF Case Study Owned by the City of Sacramento, CA Concrete Building with Upper 1/3 being a water tank Approximately 2/3 of the first floor area are offices and a training room, arranged like a donut Original HVAC was 4 pipe ducted fan coils, with a natural draft gas boiler and 30 ton air cooled chiller. Equipment replaced with (2) 16 ton VRF heat recovery type systems in 2008, with 4 ducted fan coils each, and an ERV
Significant reduction in Energy Consumption (kWh) Sacramento Drill Tower – VRF Case Study
MODULE 1: Designing with VRF Metered Data From Drill Tower
MODULE 1: Designing with VRF Metered Data From Drill Tower
MODULE 1: Designing with VRF Total Gas Cost Total Electrical Cost Total Cost Before CITY MULTI - VRF (2007) $5,987.44$19,456.78$25, After CITY MULTI - VRF (2009) $455.03$18,607.36$19, Percent Savings 92.4%4.4%25.1% Metered Data From Drill Tower *Based on Data Provided from SMUD and PGE Building is located in Sacramento
Re-Cap: Benefits of VRF Systems Space Utilization Installation flexibility to meet building space requirements Minimal impact to existing building architecture and structure Occupant Comfort Individual comfort control Indoor unit flexibility to meet the needs of any space Meets occupant ventilation air requirements Quiet operation Energy Savings Inverter driven compressor No waste heat Meets requirements for LEED points
Texas Utility SOP / MTP Programs In closing, I would like to ask the board to please support the development of programs in the state that appropriately incentivize VRF systems. By adding a VRF category to the Texas Energy Efficiency Goal utilizing the appropriate energy efficiency metric IEER, utilities will accurately capture the associated energy savings and properly incentivize the technology.
Additional Information Support Slides
Successful Utility Programs - West Prescriptive VRF Incentive $1,500/ton upstream rebate on up to 80 tons for commercial applications