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## Reduce Monthly Natural Gas Consumption – HVAC

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**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**Y Statement**• Reduce monthly natural gas consumption by 20% for the months of Dec thru Mar • Set back temperature • Insulation improvements**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**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**Analysis**• Heater on Time vs HDD**Analysis**• Heater on Time vs HDD**Analysis**• Heater on Time vs HDD**Analysis**• Error Percent of Heater on Time vs HDD**Measurement Error**• Error due to long signal wires • Filter design • Impact on mean value**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**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**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**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**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**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**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**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**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**Design Parameters**• Process Fluid • Water • Inlet 45ºC • Outlet 25ºC • City Water • Inlet 20ºC • Optimal Length Less Than 7 meters**Effective Variables**• Due to previous iterations these nine were the variables that had the greatest effect on Weight, Length, Q, and ∆P’s**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