P16013: Body Cooling System

Subsystem Design

Table of Contents

Please refer to the Detailed Design Documents directory for additional and original documents from this phase.

Team Vision for Subsystem-Level Design Phase

The Body Cooling System team planned on completing two sets of tasks during this phase: action items from the System-Level Design Review, and all assignments listed in the Subsystem Design node. All tasks were completed or will be completed in a later phase. See below for specific tasks.

Action Items

Subsystem Design Tasks

Goals for the Subsystem Design Phase

Action Items from System-Level Design Review

The following action items were identified at the System-Level Design Review to be completed during the Subsystem Design Phase:

Add breathability to customer/engineering requirements

Test for garment/skin contact in regards to flexibility

Follow up with Xerox on using environmental control chamber

Investigate places on RIT campus where environmental testing can be done

Cost Analysis

Comparison of PASCO versus ADInstruments hardware and software costs. In order to be feasible within the current budget, the PASCO hardware and software set-up has been chosen.

You can find our Cost Comparison document here.

Cost Estimates for the testing apparatus

You can find our Cost Estimates spreadsheet here.

Feasibility: Prototyping, Analysis, Simulation

Mathematical Heat Transfer Model

This model is a mathematical representation of how the cooling system will absorb thermal energy from the human host. In order to simplify this ideal model, 1-D heat transfer is assumed and heat gain from the environment is considered negligible. This model will provide values for the duration of use and the rate of cooling, but will require precise specifications of the vest, including dimensions and properties of the phase change material.

Mathematical Heat Transfer Model

Simulated Tissue Model

This model intends to physically imitate the mathematical model in set up, with a hot plate generating the thermal energy to a sample of simulated tissue. This system holds many variables constant which enables repeatable data, though a lack of realism limits the application to only side-by-side comparisons of different cooling systems.

Human Model

This model requires the use of a human test subject to wear the cooling system for the duration of the test, allowing the cooling system to heat as it would during actual use. However, it is expected that repeatability may be a problem due to inherent variations between different humans.

Predicted Temperature Profile

By applying temperature probes at on the surface of the cooling system, within the PCM, the skin surface, and the human core, we will be able to plot the temperatures as they change with time for both the simulated tissue and human model. This plot will be critical in comparing cooling systems as the slopes and values at various points will indicate too rapid or too slow of a cooling affect among other things.

Bill of Materials (BOM)

You can find our BOM spreadsheet here.

Risk Assessment

For the full risk management document, click here.

Design Review Materials

For the Design Review III Presentation, click here.

For notes from Design Review III, click here.

Plans for next phase

Key Deliverable Dates for Preliminary Detailed Design Phase

The timeline below details these tasks in depth and allocates each task to a team member to ensure that all tasks will be completed before the next design review.

Click on the timeline below to see it larger or click here to see the Phase IV timeline document.

The deliverables for the end of MSDI along with the items on the critical path are listed below.

Completed test apparatus design

Critical path:

Preliminary testing completed and data collected

Critical path:

Materials ordered and received

Critical path:

IRB Approval forms completed and submitted

Critical path:

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