P17420: Seedfolk City Farm Greenhouse Heating
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Preliminary Detailed Design

Table of Contents

Team Vision for Preliminary Detailed Design Phase

Following the previous review, a couple of key points were called into question and debated among the customers. We also received valuable feedback regarding our design and how to potentially improve it. Our goal for this phase was to get the answers to those questions, using math and modeling to support our answer, and fine tune our design. To accomplish this, we traced back to the beginning and refined our system as far back as the Functional Decomposition. This helped solidify our system. We worked to gain further evidence and proof-of-concept for our design. We are able to begin generating a BOM for our design, and even got some things ordered. We have a document to help track the BOM, purchases, and budget.

Attached are the notes from the previous review: System Design Review Notes

Feasibility: Prototyping, Analysis, Simulation

Greenhouse Thermal Modelling

Greenhouse Thermal Modelling

Greenhouse Thermal Modelling Continued

Greenhouse Thermal Modelling Continued

Modelling of the storage tank

Modelling of the storage tank

Pressure Drop Across Pipes

Pressure Drop Across Pipes

Compost Pile Pressure Modelling

Compost Pile Pressure Modelling

Compost Pile Modelling

Compost Pile Modelling

Compost Pile Modelling Continued

Compost Pile Modelling Continued

Attached is the analysis for Greenhouse thermal modeling: Greenhouse thermal modeling

Attached is the analysis for pressure drop across pipe circulating heated air: Pressure Drop

Attached is the analysis for the pressure modeling of the compost pile: Pressure Modelling

Drawings, Schematics, Flow Charts, Simulations

Attached is the excel document for thermal model simulation for the greenhouse heating system: Rochester TMY3 Data
System Block Diagram

System Block Diagram

System Electrical Power

System Electrical Power

MSP430 Program Flow

MSP430 Program Flow

Attached are the schematics for the Raspberry Pi Development: Raspberry Pi General Schematics

Attached are the schematics for the MSP430 LaunchPad Microcontroller: MSP430 General Schematics

Bill of Material (BOM)

Shown below is a snapshot of the budget/purchases to date. The full and working Bill of Materials can be found here: BOM
Preliminary BOM

Preliminary BOM

Test Plans

Testing Procedure

Testing Procedure

Attached are the various test plans: Test Plans

Design and Flowcharts

System Design

System Design

Risk Assessment

Risk Management

Risk Management

The working Risk Management document can be found here: Risk Management

Plans for next phase

Electrical Engineering

  1. Finish Schematics and I/O map
  2. Finish analysis on temperature/humidity sensors response time
  3. Finalize electrical parts that need to be purchased
  4. Continue with program code for Raspberry Pi and MSP430
  5. Verify power consumption and system power capabilities
  6. Develop test plans for hardware & software solutions

Mechanical Engineering

  1. Linking the pressure model for the entire system
  2. Selecting the fans/blowers based on pressure model and updating BOM
  3. Refining our thermal modelling/analysis
  4. Taking decisions about the composition of the compost pile
  5. Conducting analysis for selection of heat exchanger based on our refined thermal modelling
  6. Conduct analysis for selection of condensate pump based on pressure modelling/storage tank size

Industrial Engineering

  1. Update risk assessment as they become apparent
  2. Monitor budget/purchasing/scheduling
  3. Ensure needs/questions are being answered
  4. Facilitate discussion on 'proof of concept' and design
  5. Update and make project plan more specific (milestones)

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