Eclipse 300 MA, 600 MA, 1500 MA, 2500 MA Design Manual

Design Guide 540

3/9/2009

Eclipse Extern-A-Therm

Recuperators

Models 300 MA - 2500 MA

Copyright

Copyright 2007 by Eclipse, Inc. All rights reserved
worldwide. This publication is protected by federal
regulation and shall not be copied, distributed,
transmitted, transcribed or translated into any human or
computer language, in any form or by any means, to any
third parties, without the express written consent of
Eclipse, Inc.

It must be understood that Eclipse’s liability for its product,
whether due to breach of warranty, negligence, strict
liability, or otherwise is limited to the furnishing of
replacement parts and Eclipse will not be liable for any
other injury, loss, damage or expenses, whether direct or
consequential, including but not limited to loss of use,
income, or damage to material arising in connection with
the sale, installation, use of, inability to use, or the repair
or replacement of Eclipse’s products.

Disclaimer Notice

In accordance with the manufacture’s policy of continual
product improvement, the product presented in this
brochure is subject to change without notice or obligation.

The material in this manual is believed adequate for the
intended use of the product. If the product is used for
purposes other than those specified herein, confirmation
of validity and suitability must be obtained. Eclipse
warrants that the product itself does not infringe upon any
United States patents. No further warranty is expressed or
implied.

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We have made every effort to make this manual as
accurate and complete as possible. Should you find errors
or omissions, please bring them to our attention so that we
may correct them. In this way we hope to improve our
product documentation for the benefit of our customers.
Please send your corrections and comments to our
Marketing Communications Manager.

Any operation expressly prohibited in this Guide, any
adjustment, or assembly procedures not recommended or
authorized in these instructions shall void the warranty.

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must know their meaning and importance.

The explanation of these symbols follows below. Please
read it thoroughly.

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WARNING

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NOTICE

NOTE

This is the safety alert symbol. It is used to alert you to potential personal
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oderate injury.

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Eclipse Extern-A-Therm Recuperators, Design Guide 540, 3/9/2009

Table of Contents

Introduction............................................................................................................................... 4

Product Description.............................................................................................................. 4

Safety......................................................................................................................................... 5

Safety Warnings................................................................................................................... 5

Capabilities .......................................................................................................................... 5

Operator Training................................................................................................................. 5

Replacement Parts .............................................................................................................. 5

System Design.......................................................................................................................... 6

Furnace Temperature Limits................................................................................................ 6

Flue Gas Restrictions .......................................................................................................... 6

Recuperator Sizing ..............................................................................................................7

Dilution Air ........................................................................................................................... 7

Number of Recuperators ..................................................................................................... 7

Mounting the Recuperator ................................................................................................... 7

Mounting the Eductor........................................................................................................... 7

Typical Air Pipe Work .......................................................................................................... 8

Eductor Air Flow .................................................................................................................. 8

Cleaning the Recuperator.................................................................................................... 8

Eclipse Extern-A-Therm Recuperators, Design Guide 540, 3/9/2009

3

Introduction

1

Product Description

The Extern-A-Therm recuperators are compact tubular
air-to-air heat exchangers designed to recover the waste
heat in industrial exhaust gases. The recovered heat is
used to preheat the combustion air for the system’s
burners, thereby increasing the thermal efficiency. To
ensure that all the wasted heat is drawn across the
recuperator tubes, the recuperator is typically mated with
an Eclipse eductor.

The single-ended design of the Extern-A-Therm
recuperator allows for free expansion of the recuperator
tubes; no expansion joints are required.

The design of the Extern-A-Therm, housing and eductor
ensure ease of installation and efficient use of existing
pipe work. The housings are internally insulated; there is
no need for additional external insulation.

Audience

This manual has been written for people who are already
familiar with all aspects of industrial heating equipment
design.

These aspects are:

• Design/Selection

• Use

• Maintenance

The audience is expected to have previous experience
with this type of equipment.

Extern-A-Therm Documents

Design Guide No. 540

• This document

Datasheet, Series No. 540-1 through 540-4

• Available for individual Extern-A-Therm models

• Required to complete design calculations in this
guide

Related Documents

• EFE 825 (Combustion Engineering Guide)

• Eclipse Bulletins and Info Guides: 610, 710, 720,
730, 742, 744, 760, 930

Purpose

The purpose of this manual is to ensure that the design of
a safe, effective, and trouble free system is carried out.

Figure 1.1. Extern-A-Therm Recuperator

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Eclipse Extern-A-Therm Recuperators, Design Guide 540, 3/9/2009