RED PANDA TEMPERATURE STUDY

Prep - Overview
- Heat Sources - Premise of Operation
  - Radiant floor section at perimeter in slab - 4 pipe passes (2 supply, 2 return) coming from end near electrical room
  - Ventilation air from ERV not heated, but tempered by recovery
- Paths of Heat Transfer
  - Walls, windows, slab uninsulated in middle, roof (incl. roof above middle room which is loft in Red Panda)
  - Some heating of ERV ventilation air required to bring to space temp
  - Interior partition to corridor
- Review trends from this week (space temp, water temp, etc.)
  - Space temp setpoint raised to 68F
  - Maintaining 68F at stat on 26F day outside; seems to be doing okay in general

Hands-On
- Annex space pressure differentials
- Ventilation airflows
- Floor heating profile
- Temperature gradients in room
- Record of Data and Observations
- Themal Imaging Summary Report

Brain Work
- Review observations/results in Red Panda Space
  - Uniform air temp of about 70F across room
  - Middle of floor about 68F surface temp
  - Stat mounted on exterior wall set for 68F resulting in 70F air temp throughout space
  - Electric heater in Red Panda running intermittently to supplement radiant floor, but was not running during Labs review (approx. a few minutes every 90 minutes or so reported)
- Other Annex Spaces
  - Noticed blob of slightly higher temp in middle room radiant floor segment (see thermal image); looks similar to how leak might appear
  - ERV air temp about 65F coming out of supply register by garage door
  - Inner garage door surface about same temp as corridor air temp overall since improvements made; metal rails only cold spots left

Conclusions & Suggestions
- Joe plans to add insulation on top of radiant floor heating in electrical room; room does not need heat, so preserve it for other spaces.
- Joe indicates system does not appear to be losing water, so elevated temp blob in middle room may be imperfection in concrete and/or place where PEX piping comes closer to surface; unknown.
- Still some furniture and other items on top of radiant surface; some (metal) get heated up and then distribute their heat back to space; others (wood) appear to block heat more.
- Any additional research or calcs required?
  - None identified at this time.

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