2016 Title 24 HVAC Topics. June 4, 2013

Transcription

1 Title 24 HVAC Topics June 4, 2013

2 CEC 2016 Title Introduction 24 Schedule Jun Apr 2014 CEC develop foundation. IOUs: research, costeffectiveness analysis, stakeholder meetings Mar 2015 Efficiency committee hearing(s) CEC develops 45-day language May-Oct 2014 Pre-Rulemaking. CEC workshops, First Draft Language Jun-Sep 2015 CEC develops 15-day language Title 24 CEC Adoption date Nov 2014 IOUs finalize code change proposals for submittal to CEC CEC conducts impact analysis report Jan 2016 CBSC Publication date Jan 2015 Efficiency committee workshop(s) CEC opens Rulemaking for Title 24 Jan 1, 2017 Title 24 Implementation date 2

3 2016 Residential Measures All high efficacy lighting No Ducts in Unconditioned Space: Walls - R-21 + R5 in hot (all?) CZs Windows 16% of floor area or high performance windows QII - Quality Insulation Installation inspection Tested Infiltration < 3 ACH 50 Heat recovery ventilation Controlled supply mechanical ventilation FDD/CID refrigerant charge/condensables Smart Thermostat and Acc Test Evap cooling baseline hot/dry CZs Credit for evaporative FDD Dual path PV with high efficiency HVAC and DHW Multi-family prescriptive package Compact water distribution Shower/bath heat recovery above 1st floor Heat pump water heating model Updated solar thermal model High efficiency white goods Whole building (HERS) model including deemed plug loads. Plug load controller Reduced water consumption Plug-in hybrid and EV charging circuit (MF) ZNE CALGreen Tier 3

4 RESIDENTIAL HVAC 4

5 HVAC to Support No Ducts in Unconditioned Space Eliminate Ducts Mini-split as method of getting ducts out of unconditioned space Improve VRF model Refrigerant leakage/installation training Ducts and Air Handler in Conditioned Space Eliminate atmospheric furnaces Sealed combustion furnace Can be condensing but don t have to be Combined water heating and space heating Water heater in garage but also near hot water loads Heat pump (ground source?) Image Courtesy of Inquiring Eye Home Inspections, LLC 5

6 Refrigerant Charge Fault Detection and Diagnostics FDD/CID refrigerant charge/condensables (2016?) Propose a requirement for FDD that would verify proper refrigerant charge, lack of condensables in the system and proper airflow. FDD already required for nonres economizers Could also be applied to commercial AC Addresses problem of winter charge test Less times refrigerant system is attached to gauge set with potential for refrigerant loss and contamination of refrigerant (dirt, noncondensables) 6

7 Evaporative cooling Evaporative cooling baseline hot/dry CZs Evaluate and develop and evaporative cooling code baseline for homes in hot/dry climate zones Evaporative options: Evaporative condensing Evaporative cooling of airstream Direct, indirect, direct/indirect ACM simulation model: based on first principles (wetbulb temperature) includes humidity comfort model 7

8 Avoiding Preemption: Multiple Path Energy Codes Prescriptive Paths Standard Path Alternate Path Photovoltaics or Large Impact Efficiency Measure Reduced or no PV required or other Eff Measure Performance (Software) Approach Photovoltaics or Large Impact Efficiency Measure Minimum Federal Efficiency Equipment Higher Efficiency Equipment than Fed Min Eff Minimum Federal Efficiency Equipment Other Common Efficiency Measures Other Common Efficiency Measures Other Common Efficiency Measures At least one standard path for every alternate path with higher efficiencies 8

9 Res Ventilation Controlled supply mechanical ventilation Evaluate the costs, the energy benefits and the air quality benefits from replacing exhaust based ventilation with supply based ventilation Heat recovery ventilation Evaluate whether heat recovery ventilators are cost-effective in the more extreme climate zones and develop a proposal if so. This would replace the other mechanical ventilation requirements.. 9

10 NONRES HVAC 10

11 Refrigerant Charge Fault Detection and Diagnostics FDD/CID refrigerant charge/condensables (2016?) Propose a requirement for FDD that would verify proper refrigerant charge, lack of condensables in the system and proper airflow. FDD already required for nonres economizers Could also be applied to residential AC Addresses problem of winter charge test Less times refrigerant system is attached to gauge set with potential for refrigerant loss and contamination of refrigerant (dirt, noncondensables) 11

12 HVAC Design and ACM Measures Low W/sf HVAC systems Limit connected HVAC connected load. Don't double count interlocked loads. Consider a fan efficiency requirement or W/cfm requirement Heat recovery Heat recovery with thresholds by cfm of O/A and climate zone ACM - Base Case HVAC rule set Performance rule set without exceptions (VAV reheat?), max W/sf, validated EPlus algorithms, base case and proposed case when AC not used, comfort model ACM - Improved and validated VRF simulation Rigorous method of incorporating VRF test data into simulation that results in accurate estimate of energy impact. ACM - VAV w/reheat, integration with DCV, chilled beam and DCV, Validate and improve Eplus simulation of nonresidential HVAC simulation types. Compare to equest and rationalize or fix the discrepancies 12

13 Duct Sealing Remove current limitations on duct sealing (max 5,000 sf) for single zone systems with ducts that are outdoors and in unconditioned that must have ducts sealed, tested and verified spaces Expand sealing, testing and verifying of return ducts Indirectly conditioned spaces (plenums)? Sealing testing and verifying supply ducts upstream and downstream of VAV boxes Outdoors and in unconditioned spaces Indirectly conditioned spaces (plenums)? 13

14 Equipment Efficiency: Dual Path Approach Dual path prescriptive approach Primary path: Minimum Federal equipment efficiency with other measure (PV, window overhangs or internal/external light shelf etc), PV desirable as prepares code for ZNE later on Alternate path: Higher equipment efficiency than minimum federal levels HVAC, Water Heating Performance model: PV model offsets consumption Performance method base case includes minimum federal equipment efficiencies with PV and a method for making trade-offs with other combinations of measures 14

15 Measures Based on ASHRAE 90.1 Updates Fans: AMCA 205 Fan Efficiency Grade of xx ASHRAE 90.1 is FEG 67 Curve of motor/fan efficiency that varies with size Air terminal units: maximum leakage rates Limit reheating even during economizer mode 15

16 Advanced HVAC Advanced HVAC: Nat ventilation, dedicated O/A, + chilled beam or radiant system. Evaporative cooling and desiccant cooling Evaluate prescriptive requirements for advanced equipment or ventilation. Remove barriers for performance options for any advanced technology. Improved Natural Ventilation and displacement ventilation simulation Evaluate Eplus natural ventilation model and make recommendations for the ACM. Evaluate the feasibility and cost-effectiveness of a natural ventilation and displacement ventilation base case by climate zone.. Radiant model including comfort Evaluate Eplus radiant heating/cooling model and make recommendations for the ACM. Update Eplus model if necessary. Adjust setpoint temperatures based on ASHRAE 55 and operant temperature. Absorption air conditioning Suitable to be used with solar heating or heat recovery 16