Achieving Optimized HVAC Efficiency with Precision Flow Control

1. Achieving Optimized HVAC Efficiency with Precision Flow Control Introducing the Honeywell VRN and VRW Flow Control Valves

2. Modern Operating Conditions Escalating energy costs Increased focus on reduced operating costs Variable speed pumping (Required by ASHRAE 102) Changes pressures and flows in response to building heat load LEED designs with lower flows/higher ?T’s than used in the past Phased building construction Puts greater loads and higher variation in pressure than the final designs are based on Industry strapped for time/people Non-traditional geographies Industry skills loss

3. Improving Coil Efficiency

4. The Problem with Pumps All pump impellers have a characteristic curve which correlates flow and pump head pressure As system flows change, head pressure changes inversely Pressure changes travel in the system at the speed of sound At low loop flows, small pressure changes cause large changes in thermal output, causing hunting in the control system

5. Traditional Balancing for HVAC Systems Limit the flow to calculated design when every branch of the HVAC system is "wide open" (design conditions) Prevents closest branches from starving far loops Standard solution: multi-turn manual balancing valves Hard to achieve a well balanced system with traditional products and methodology 3 passes around the building to adjust balancing valves in each zone Specialized trade (adds cost and time to building commissioning) Real system conditions vary as heat loads change from design conditions Traditional designs put additional capacity in place to overcome these issues, driving higher initial cost and higher operating costs

6. Dynamic Flow Control Solution Match the flow to the load in every heat transfer device without excess flow throughout full operating range Much more than just balancing Simplified, lower-cost piping layout Fast, accurate system set-up Not just at design conditions, but at every operating point Extended HVAC equipment life Improved efficiency Lower operating cost

7. The Solution to Modern Flow Control

8. Pressure Regulated Valve Design

9. Pressure Regulating Control Valve Benefits Integrates flow regulation and temperature control functions into one product, reducing installation time and cost Replaces balancing valves Requires minimal commissioning Eliminates need for 3-way valves to relieve pressure at end of loops Stable flow control improves comfort and efficiency while lowering operating costs No space temperature changes due to head fluctuations Longer actuator life by eliminating "hunting" Controlled flow rates allow optimum chiller, boiler, and pump sizing, reducing installed cost Operating Chillers at optimum ?T (temperature drop) maximizes efficiency and lowers operating costs Rule-of-Thumb: +2%/°F Reduced pump speed saves power

10. Inside a VRN Series Valve

11. Pressure Regulation Range

12. Features of the VRW Series

13. Easy to select – a “logical” numbering system

14. Honeywell's VRN and VRW Series' Advantages Honeywell’s full line is designed to meet complete HVAC systems needs Full range of sizes from ½" to 6" (1 gpm to 469 gpm) VRN: ½ to 3" NPT, 1-95 gpm VRW: 2-½ to 6" flanged, 39-469 gpm Industry leading precision for tighter control Flow control accuracy within ± 5% Maintain tighter ?T to optimize chiller efficiency Industrial-grade performance at HVAC prices Unique Field-Serviceable control valve Serviceability = long-term life = long-term savings Field-proven technology

15. Benefits Summary – Honeywell VRN and VRW Valves