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MHA Research Heater

photos by Norbert Senf

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Oct 31/15:  Heater build
Dec 20/15: Modification 01 (firebox)
Feb 15/16: Modifications 02
Jan 14/17: Instrumentation
Jan 19/18: Modifications 03 (chimney)
Jan 29/18: Modifications 04 (heat exchanger)

January 18/19 Modifications:
-- Chimney modification to conform to EPA
laboratory testing conditions

Chimney modified to be substantially equivalent to NSPS (EPA) certification testing, which
requires the exit to be inside the laboratory at a height of 15' +/- 1'.

Height of Tee is at 17'.
T is 7" diameter, as is the chimney below. This is vented above by 6" diameter insulated chimney.
The T bleeds air into the chimney and brings the pressure at the junction to 0.
This sets the chimney draft equivalent to a 17' high inside exit chimney.

January 29/18 Modifications:
-- Reconfigure channels from parallel to serial

Heater firebox viewed from  instrumentation room side.

Firebox is connected to heat exchanger via insulated chimney pipe.
Heat exchanger exits into heated bench.
Heated bench is connected to chimney.

Cross section through firebox, insulated connecting pipe,
and heat exchanger. Gases exit at bottom right into heated
bench .

Reconfigured heat exchanger.

Original layout with the heat exchanger ceiling removed.
Around the edge is a ceramic fiber gasket.
A thermocoupld and  pressure sensor tap are visible

View from above.
Same view.
Composite photo of existing condition.

The chimney pipe inlet area was repaired.

Bricks added to reconfigure the gas flow.

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This page was updated on  February 1, 2019
This page was created on  January 29, 2018