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Reduce Monthly Natural Gas Consumption – HVAC

Reduce Monthly Natural Gas Consumption – HVAC. Mohammad Shams, Seyed Alireza Tabatabaei , Roozbeh Hojatpanah , Siavash Farahmand , Shahriar Ahmadi Ghoohaki. Department of Mechanical Engineering, IUPUI ME 414 Thermal-Fluid Systems Design Fall 2010, Professor John Toksoy.

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Reduce Monthly Natural Gas Consumption – HVAC

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  1. Reduce Monthly Natural Gas Consumption – HVAC Mohammad Shams, SeyedAlirezaTabatabaei, RoozbehHojatpanah, SiavashFarahmand, ShahriarAhmadiGhoohaki Department of Mechanical Engineering, IUPUI ME 414 Thermal-Fluid Systems Design Fall 2010, Professor John Toksoy

  2. Y Statement • Reduce monthly natural gas consumption by 20% for the months of Dec thru Mar • Set back temperature • Insulation improvements

  3. The Funneling Effect 30+ Inputs All X’s • Process Maps MEASURE 10 - 15 1st “Hit List” • C&E Matrix • Failure Modes and Effects Analysis • Multi-Vari Studies 8 - 10 ANALYZE Screened List IMPROVE • Design of Experiments (DOE) 4 - 8 Found Critical X’s CONTROL 3 - 6 • Control Plans Controlling Critical X’s Critical Input Variables

  4. Does the Setup Measure Energy Consumption Accurately • For each of the 24 hr data set • Calculate the heater on time • Calculate heating degree days • Plot HDD vs. heater on time • Does it show a linear behavior

  5. Analysis • Heater on Time vs HDD

  6. Analysis • Heater on Time vs HDD

  7. Analysis • Heater on Time vs HDD

  8. Analysis • Error Percent of Heater on Time vs HDD

  9. Therms Analysis

  10. Measurement Error • Error due to long signal wires • Filter design • Impact on mean value

  11. Initial Capability • Initial capability • What is the current energy usage as baseline where savings will be calculated from • Degree day comparison • Past 5 to 10 years gas and electric bills (kWhr used not $$$) • Calculate heat loss from the house using the excel analysis tool • Make the tool more general to include individual rooms • Run transient heat transfer analysis using the Matlab tool and compare to measured data

  12. Energy Cost Estimation

  13. Results • The cost for one day at these temperatures is: $0.33 • The optimal day time temperature is: 51 Degrees F • The total running time per day is: 97 Minutes Jan 22nd

  14. Results • The cost for one day at these temperatures is: $0.13 • The optimal day time temperature is: 59 Degrees F • The total running time per day is: 38 Minutes Jan 28th

  15. Results The cost for one day at these temperatures is: $0.18 The optimal day time temperature is: 47 Degrees F The total running time per day is: 53 Minutes Jan 29th

  16. Results Feb 3rd • The cost for one day at these temperatures is: $0.24 • The optimal day time temperature is: 48 Degrees F • The total running time per day is: 71 Minutes

  17. Results The cost for one day at these temperatures is: $0.28 The optimal day time temperature is: 50 Degrees F The total running time per day is: 83 Minutes Feb 4th

  18. Results The cost for one day at these temperatures is: $0.27 The optimal day time temperature is: 50 Degrees F The total running time per day is: 79 Minutes Feb 5th

  19. Results The cost for one day at these temperatures is: $0.22 The optimal day time temperature is: 49 Degrees F The total running time per day is: 64 Minutes Feb 6th

  20. Mohammad Shams, SeyedAlirezaTabatabaei, RoozbehHojatpanah, SiavashFarahmand, ShahriarAhmadiGhoohaki Heat Exchanger Design Department of Mechanical Engineering, IUPUI ME 414 Thermal-Fluid Systems Design Fall 2010, Professor John Toksoy

  21. Design Parameters • Process Fluid • Water • Inlet 45ºC • Outlet 25ºC • City Water • Inlet 20ºC • Optimal Length Less Than 7 meters

  22. Effective Variables • Due to previous iterations these nine were the variables that had the greatest effect on Weight, Length, Q, and ∆P’s

  23. Generated Matlab File

  24. Initial Inputs Generating

  25. Plots of Main Effect

  26. Pareto Charts for Optimization • Shell side pressure drop- Shell I/D had the greatest effect • Heat Exchanger overall weight- Shell I/D and Tube Length • Tube pressure drop- Mass flow rate through the tubes, Shell I/D and Tube Length • Shell side pressure drop- Shell I/D had the greatest effect • Heat Exchanger overall weight- Shell I/D and Tube Length • Tube pressure drop- Mass flow rate through the tubes, Shell I/D and Tube Length

  27. Pareto Charts for Optimization

  28. Optimization Plot

  29. Optimization Results

  30. Adjusted Optimized Results

  31. Questions ?

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