Knowledge is Power Belimo Energy Valve CHW DELTA T MITIGATION STUDY AHR Expo Innovation Award Winner in the Category of Building Automation
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1 Knowledge is Power Belimo Energy Valve CHW DELTA T MITIGATION STUDY 2014 AHR Expo Innovation Award Winner in the Category of Building Automation The Belimo Energy Valve won the Technical Innovation of the Year Products at the BCIA Building Controls Industry Association Awards. BOB RYBKA BELIMO AMERICAS
2 Delta T Mitigation Strategies Energy Valve Site Study Dynamic Balancing Control Valve Technology Chilled Water delta T Study Chilled Water System Design AHU Coil Beta Site Study Correcting Low delta T Data Analysis and Optimization Additional Applications 2
3 Pressure Independent Control Valve Operational theory Water exits valve Pressure is P2 (low) Water passes through regulator, disc, and ball Pressure Drops Water enters valve Pressure is P1 (high) Ports sense pressure drop and transfer it below regulator Low pressure pulls regulator down, against the spring force
4 ELECTRONIC PRESSURE INDEPENDENT VALVE 1/2 6, 1.65 thru 713 GPM Actuator Flow Sensor Valve
5 ELECTRONIC PRESSURE INDEPENDENT VALVE WITH WATER DELTA T MANAGMENT ½ 2 NPT thru 76 GPM FLANGED - 90 thru 713 GPM 5
6 Library Case Study Case Study Issues Coil delta T reported as 6 Degree F Over pumping Low delta T Syndrome at Chiller Plant 6 AHU units, 153,000 sq-ft 6
7 Chilled Water System Peak Load 26,000 Tons UNIVERSITY CAMPUS STUDY * From 2008 Chilled Water Delta T Study 7
8 Savings by Eliminating Causes of Low Delta T (30,000 Ton Plant) Recommend implementing chilled water delta T improvement projects across the campus. Component Annual Energy Annual Cost Savings Savings Chiller Steam 10,887 Mlbs $181, Chiller Electric 2,576,000 kwh $412, CHW Pump Electric 2,334,000 kwh $373, CW Pump Electric 2,417,000 kwh $387, CT Fan Electric 740,000 kwh $118, TOTAL SAVINGS $1,471, % of Total 8
9 Design Flow and delta T are inversely proportional; for a given load, when delta T drops flow has to increases. 800 GPM GPM Tons T 800 GPM Tons 2 Tons 24 T 800 GPM 2 Tons 400 Tons 9
10 Typical Chilled Water System System Data Chiller #1 Load = 90% Chiller #2 Load = 0% Loop Flow = 360 GPM Chiller T = 12 F Increase flow by 15% 42 VFD Pump CHWS 180 Ton Load (45%) Chiller 200 tons 90% Load CHWR 54 Design: 400 Ton CHW 12 T VFD Pump Chiller 200 tons 360 GPM Loop Flow 10
11 Typical Chilled Water System System Data Chiller #1 Load = 45% Chiller #2 Load = 45% Loop Flow = 414 GPM Chiller T = 10.4 F Increase flow by 15% An additional pump and chiller were started to meet the flow demand, not cooling demand! Design: 400 Ton CHW 12 T 42 VFD Pump VFD Pump CHWS 180 Ton Load (45%) Chiller 200 tons 45% Load Chiller tons 45% Load 414 GPM Loop Flow CHWR
12 Causes of Low Delta T Control valves oversized Controlling the water valve using air temp Inadequate balancing procedure Non-dynamic balancing Changes to piping system 12
13 Not the Solution Deny or Choke Valve, will not allow a coil to run as designed. This application will negate proper dehumidification and comfort. 13
14 Library Case Study Case Study Issues Coil delta T reported as 6 Degree F Over pumping Low delta T Syndrome at Chiller Plant 6 AHU units, 153,000 sq-ft 14
15 Case Study AHU-6, CHW delta T with Belimo SL System Globe Valve test delta T control deactivated. 15
16 Case Study AHU-6, CHW delta T with delta T control active-globe Valve test. 16
17 Case Study Setup 5 Flow Meter/Delta T Control Valves 1 Tandem Venturi Valve with Delta T Control Chilled Water is designed to run through a coil at a designed temperature drop to supply air conditioned cooling air and to de-humidify. i.e. Water delta T=12 degrees F. 17
18 Delta T and GPM control valve 2.5 6, 90 thru 713 GPM The Valve is a pressure independent control valve that optimizes, documents and proves water coil performance by correcting low delta T. Actuator Magnetic Flow sensor Valve Temperature Sensors (for supply & return water) 18
19 Valve Operation Pressure independent, Mag flow meter maintains proper flow. Delta-T Manager will maintain design Coil delta-t. Delta T will stay constant eliminating overflow. The Energy Valve s GPM meter, and temperature sensors add no additional DDC points to a system. 19
20 New Definitions Power Saturation Point Point beyond which coil cannot yield additional heat transfer regardless of increased flow. Waste Zone Range beyond the Power Saturation Point. 20
21 AHU-6 Power Curve: July 4, 2011 (data is PI valve function only) 21
22 AHU-6 DT Curve: July 4, 2011 (data is PI valve function only) 22
23 Power Saturation & Waste Zone 23
24 Energy Valve Delta-T Manager Operation DDC SIGNAL 24
25 Pump Savings Example 24% Flow Savings = 56% Energy Savings T Pump flow Savings = ( )/56.6 = 24% Mechanical Energy Savings =1-((1-.24) power 3) =56% , , T TCurve Flow [GPM ] 25
26 Hours Delta T Manager Active (Summer 2011) 1
27 MIT, Haden Library Whole Building Results 2011 vs Flow 8/9-10/ F T 8/9-10/ F T From whole building meters, Metering data PI archive Tonsx24/GPM= Weighted Average delta T 6 AHU units, 153,000 sq-ft 2
28 Case Study Findings The delta T limiting is especially effective on coils that display power saturation Overall reduction of chilled water flow. Significant energy savings are realized in mechanical pumping energy with Delta-T Manger. 3
29 Library Saving Calculations Using Data supplied by the Campus Engineering, increasing water delta T from 6 to 12 degrees. The potential savings for calendar year 2011 are as follows: 2011 had 1005 COOLING D-DAY»$12, CHW PUMP ALONE (25% of total savings). Plant savings, turning off chillers, condenser pumps and fans would equal a potential savings of $50,
30 Chilled Water Delta T management technology Technical Summary Maximize coil performance Monitor savings at the coil level Documented commissioning of coil 13 month data archive 5
31 Belimo Energy Valve Features & Benefits 6
32 Knowledge is Power Process Order 1. Benchmarking 2. Data Acquisition 3. Analysis 4. Optimization 7
33 Benchmarking Step 1 Building Design The first iteration of benchmarking is the Engineer s design 8
34 Data Acquisition Step 2 Delta T and Flow data Flow Delta T Energy Output Power Output Totalized Energy 9
35 Data Acquisition Step 2 Data Export and the Excel Tool Energy Valve Data Logging and Storage Up to 13 Months of Data Export to.csv file format Excel Tool Import.csv in to Excel Tool Power Curves Charts, Graphs, Trending 10
36 Data Acquisition Step 2 Web View Live Trending View Live Trending Temperature Flow (GPM) Power (kw) Up to 1hr of Data Features Real Time Data Export to.csv 11
37 Data Acquisition Step 2 Web View Live Trending View Network Communications BACnet MS/TP BACnet IP TCP/IP MP-bus 12
38 Data Acquisition Step 2 Supported BACnet Objects 13
39 Data Analysis Step 3 Analyzing the Power Curve ` Belimo, 2012
40 Optimization Step 4 Web View - Parameterization Settings View Networked, Communicate via Web Real Time Configuration Real Time Data 15
41 Optimization Step 4 ZTH-2 - Parameterization Tool Quick Programming Quick Reconfiguration Fast Commissioning Hand Held Local Display 16
42 Hot Water Applications High Efficiency Condensing Boilers Boiler efficiency 98% Combustion gas 18 F above return water temp Return temperature should be below 110 F 17
43 Thank You 18
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