Energy Valve Delta T Manager Belimo Energy Valve™ Delta T Manager™ Energy Valve Delta T Manager

Energy Valve Delta T Manager Presentation Agenda Low Delta T at the Coil Some of Low Delta T Causes Low Delta T Cost of Overflowing Coil Cost of Chiller Staging Cost of Over Pumping Occupant Comfort Does it Really Work? Benefits Energy Valve Delta T Manager

Energy Valve Delta T Manager Low Delta T at the Coil Low Coil Delta T = Inefficient Heat Transfer Increase GPM >> No Increase in Energy output More Pump HP >> Reduction in Plant Efficiency Energy Valve Delta T Manager

Low Delta T Some of Low Delta T Causes Low Control Set Point Fouled Coils Low Valve Authority Causes of Low Delta T Low Control Air Temperature Set Point: One of the main causes of Low Delta T as the system tries to achieve the low air temperature by overflowing the coil. Fouled Coiler: Coils degrade over time. Without proper maintenance, the coil output is reduced leading to low heat transfer. Oversized Valves: Have low valve authority. This authority is exasperated during low load conditions. Using Bypass or 3-Way Valves: Reduces delta T across the coil. Increase in Supply Water Temperature. This increase reduces the coil power. Thus produce less energy. Energy Valve Delta T Manager

Low Delta T Coil Power vs Delta T Behavior Explanation of Coil Curve in relation to Delta T Curve. Energy Valve Delta T Manager

Low Delta T Cost of Overflowing the Coil… 1 335000 330000 2 Coil Power Curve Click: Here is an example of a power curve. Click: and a Delta T curve. Click: When we take a late point on the power curve where flow is 65 gpm. You’ll notice that the Power output was 335KBTU and the Delta T is 10.5°F. Click: Now, When we take another earlier point on the power curve where flow is 55 gpm. You’ll notice that the Power output was 330KBTU and the Delta T is 12°F. 12°F Delta T Curve 10.5°F 55 GPM 65 GPM Energy Valve Delta T Manager

Low Delta T Cost of Overflowing the Coil… 1 2 Δ BTUh 330,000 335,000 1.5% GPM 55 GPM 65 GPM 18% Pump hp Hp increase = (65/55)3 65% ? Energy Valve Delta T Manager

Delta T Manager™ Cost of Chiller Staging Chiller Plant Efficiency Design Condition Design ΔT=12oF (54oF - 42oF) 360 GPM 1 Chiller, 90% Load (180 Ton) Scenario: Chiller plant with 2 x 200 ton chillers in parallel, each with VFD pump Imagine a scenario where a 45% load on a 2 chiller plant yields one chiller operating at 90% based on 432 gpm and a delta T of 12 (all at design) In the next slide we are going to show how a small reduction in delta T, pushes this system in to the waste zone and causes addition chiller resources to be used to satisfy the same load 360 GPM Loop flow Energy Valve Delta T Manager

Delta T Manager™ Cost of Chiller Staging Chiller Plant Efficiency Low ΔT ΔT=10.4oF (52.4oF - 42oF) 415 GPM 2 Chillers, 45% Load (180 Ton) Low Delta T: same load (180 tons) now has: 10.4 delta T, requires 498 GPM (15% overflow) 2 chillers at 45% each A second chiller staged based on flow, not load. Wasted chiller capacity… We already discussed pump affinity, but you can re-enforce, 15% overflow = 52% more pump HP 415 GPM Loop flow No change to the load, but a 2nd Pump and 2nd Chiller are started. Energy Valve Delta T Manager

Low Delta T Cost of Over Pumping Delta T Manager Signal Wasted Pumping DDC Signal Section 1 (animation 1): Library Startup cycle, immediate high demand causes overflow at the coils (flow past saturation point). Orange line and blue line are on top of each other. Delta T drops passed limit of 12F and past the 2F dead band… delta T manager engages when the measurement hits 10F Section 2 (animation 2): Delta T manager causes the valve to close and the flow to reduce, point out that the orange line represent the actual flow of the valve reducing by nearly 1/3. The delta T raises from around 9F to 12F. Around the same time, the space is satisfied (note that the blue line, building control, begins to request less flow indicating a satisfied state). The entire process took about 30 minutes. Section 3 (animation 3): We believe that at about 10:45 to 11:00 am the library opened and became under load (student bodies). The behavior of the control system is nearly identical to that of the start up cycle. It immediately asks for too much water and creates another low delta T scenario. Section 4 (animation 4): Delta T manager fixes the issue and stays engaged all day. We recognize that the room condition is satisfied, because the control set point for the valve stabilizes, if demand were not met, the call for valve flow would continue to increase. Delta T Manager On Delta T Manager On Energy Valve Delta T Manager

Delta T Manager™ Occupant Comfort “How can I let the Delta T Manager limit flow if it doesn’t measure discharge air temperature? What about occupant comfort?!?” Click: Here is an example of a power curve. Click: and a Delta T curve. Click: When we take a late point on the power curve where flow is 65 gpm. You’ll notice that the Power output was 335KBTU and the Delta T is 10.5°F. Click: Now, When we take another earlier point on the power curve where flow is 55 gpm. You’ll notice that the Power output was 330KBTU and the Delta T is 12°F.

Delta T Manager™ Occupant Comfort Delta T Manager adjusts the valve if the ΔT drops below the set point in order to maintain peak coil efficiency Virtually No Power Reduction 335000 325000 Delta T Curve Power Saturation Power Curve Delta T Set Point Click: Here is an example of a power curve. Click: and a Delta T curve. Click: When we take a late point on the power curve where flow is 65 gpm. You’ll notice that the Power output was 335KBTU and the Delta T is 10.5°F. Click: Now, When we take another earlier point on the power curve where flow is 55 gpm. You’ll notice that the Power output was 330KBTU and the Delta T is 12°F. 55 GPM 65 GPM Energy Valve Delta T Manager

Energy Valve Delta T Manager Does it really work? Energy Valve Delta T Manager

Case Study Large Tech Company in North Carolina DT Management 96 GPM Flow Control 144 GPM Introduce each data set by its control/limiting method Position Control (functions like CCV) Flow Control (functions like ePIV) Flow Control with Delta T limiting Let’s evaluate the performance of each at a given load of 60 tons Position Control uses 240 GPM to achieve 60 tons Flow Control uses 144 GPM to achieve 60 tons Flow Control with Delta T limiting uses only 96 GPM to achieve the same load of 60 tons Position control uses 2.5 times the amount of water (than delta T management) to achieve the same load! 240 GPM Position Control Energy Valve Delta T Manager

Case Study MIT University Hayden Library - Boston, MA Building and Project Details 150,000 sq. ft. on 3 floors 6 AHU provide majority of the cooling Results Aug 9 - Oct 9, 2010 DT = 6.15°F Aug 9 - Oct 9, 2011 DT = 12.14°F The average delta T in Hayden Library AHUs went from 6.15 to 12.14 with use of EV. Load to Flow ratio indicates the same load can be satisfied with less water… using less water means lower demand on chiller plant… this means freed capacity to cool additional loads Independent engineering study concluded that MIT could save about $1.5M/yr campus wide is all delta T issues were resolved Mention – MIT You Tube Video - and www.energyvalve.com Energy Valve Delta T Manager

Case Study University of Miami Hospital Building and Project Details Rosenstiel Building 11 AHUs 2600 Tons of Cooling Over 10,000 GPM Results Delta T raised from 5.5°F to 10.5°F Flow ~ 5600 GPM Estimated $66,000/yr savings Estimated 2.9 year payback Energy Valve Delta T Manager

Delta T Manager™ Benefits Coil ΔT Managing for peak coil efficiency Optimization in retro-fit applications Chiller Plant Improved chilled water plant efficiency Released chiller capacity Pump Reduced pump energy Occupant Comfort No reduction in supplied energy Belimo Americas Danbury, Connecticut

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