Upload
kristopher-richard
View
217
Download
0
Tags:
Embed Size (px)
Citation preview
ARE WE ALONE?
Osinanna OkonkwoVinay Prasad
Ugochukwu AnyaorahDaniel Reed
PROBLEM STATEMENTS
Our Goal as experts in HVACsystems was to respond to a RFQ(Request For Quotation)issued by NASA, for thecreation of a housing heatingsystem in the North pole.The house in question is required tosupport 4 scientists for 4 months,delivering functionality and comfort
CONSTRAINTS
• Inside temperature of 25° C• Outside temperature of -40°
C• Maintain oxygen at a rate of
32L/min.• Minimize flow rate variation
between all registers
PROJECT MANAGEMENT - RACI
THE HOUSE
REQUEST FOR QUOTATION
To win the contract we had toachieve the following:
– Lowest blower cost – Lowest material cost– Least Labor– Operating Cost– Client Satisfaction
LEAST BLOWER COST
LEAST BLOWER COST
• Achieving this goal required minimizationof the system pressure drop. To do this we
usedFlowmaster software to create a HousingHeating System.
• A network was created but due toinsufficient technical support however theresults of this part of the project wereinconclusive.
THE NETWORK
FLOWMASTER DUCT PLAN
LEAST MATERIAL COST
LEAST MATERIAL COST
Achieving this goal required theminimization of rubber coatedsheet metal used in making theduct system.
OPTIMIZING MATERIAL USE
In order to reduce waste we had tooptimize the diameter of the cylindrical straightpipes used in the duct-work.
Optimization process:90in side of sheet four 22.25in Circumference pipes 7.08in
Diameter
This minimized cost as none of the coated sheetmaterial was wasted, while still allowing us a goodenough pipe diameter for a good flow rate.
TOTAL MATERIAL COST
Cost per sheet - $250Diameter of pipe– 7.08inCircumference of pipe– 22.25in 4 per sheet
TOTAL MATERIAL COST - $7,750
LEAST LABOR COST
LEAST LABOR COST
To obtain this goal we had tominimize shearing of sheets
aswell as the use of 90 degreebends and branches due tothe high cost of producingthem.
TOTAL LABOR COST
TOTAL LABOR COST - $2,800
OPERATING COST
OPERATING COST
This required the minimization of
Energy costs. The cost ofmaintenance items includes:
– monthly natural gas costs– oxygen costs– Electricity costs.
Natural Gas Cost- Heat Requirement
• Based on an inside temperature of 25° C• Using peak heat requirement• We Assumed
– No heat transfer by radiation– No heat loss from basement to ground– Inside wall dimensions were used for heat transfer
surface area
460 “
296” Depth: 240”
Natural Gas Cost- Heat Requirement
• Convection coefficients differed due to orientation and outside or inside location
– hin for vertical walls was 8.29 W/m2·°C * (still air)
– hin for roof was 9.26 W/m2·°C * (still air)
– hout for vertical walls and roof was 34
W/m2·°C * (air at 15 mph and any orientation of wall)* Cengel, Yunus A. Heat Transfer: A Practical Approach. pp 175, Table 3-7.
McGraw-Hill Companies, Inc. 2003.
Natural Gas Heating Cost
• Heat Requirement: Q = 41655.21 W
hrm
ft
ftefficiencyMJ
m
J
MJ
hr
s
s
JCost
4472.7$
02831685.0
1
1
045.0$
8.0
1
4010
1
1
360021.416653
3
3
3
6
60.21813$1221
2445.7$ days
day
hrs
hrCostHeatingTotal
Oxygen Costs
OXYGEN SUPPLY: OPTION I To supply oxygen to the 4 scientists (eachscientist breathes air at 8L/min 32L/min),we decided to utilize PHOTOSYNTHESIS.
Name of Plant: Leucaena leucocephala(Pronounced: Loo-Say-Na)
Leucaena leucocephala – Plant Facts
• One plant is estimated to produce about 0.22L of oxygen per minute.
32L/min required 0.22L/min per plant 145 plants
• Applying a factor of safety of 1.1 we agreed on 160 plants.
• Planted at 6in intervals, the plants will occupy approximately a 7ft. X 7ft. Area in the basement.
Total Cost = 10c a plant x 160 $16.00As opposed to
32L/min x 60min/hr x 24hr/day x 120 days = 5529600L5529600L / 3000L/tank = 1844 tanks
1844 tanks x $1050 per tank = $1,936,200
LEAST FLOW RATE VARIATION
LEAST FLOW RATE VARIATION
Again due to lack of technicalSupport the results of this part
ofthe project were inconclusive.This is due to an
incompatibilitybetween software and project.
FINAL COST SHEET
• Blower cost - INCONCLUSIVE• Material Cost - $7,750• Labor Cost - $2,800• Heating Cost - $21,813.60• Oxygen Replenishment - $16.00• TOTAL COST - $32,380
CONCLUSION
• Designed a heating network using Flowmaster
• Successfully determined heating cost
• Successfully determined oxygen replenishment cost
QUESTIONS