Waste Heat Boiler

Technology guide

Heat recovery
A guide to key systems and applications

Contents

Introduction
Check the heat recovery application charts for your type of heat recovery

3

Heat recovery applications: ventilation

29

Balancing the increased need for ventilation with energy savings measures

Heat recovery: the basics

8 Heat recovery applications: industrial processes
Aninitial guide to identifying waste transfer techniques

How to identify waste heat, discover where it is coming from and measure its use

42

Heat recovery applications: boilers
Types of boilers, how they work and how you can capture wasted energy

12

Next steps

55

How to take your heat recovery plans further

Heat recovery applications: refrigeration
How to rearrange yourrefrigeration circuits to recover lost heat

22

Technology guide

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Introduction
This guide can provide you with an appreciation of heat recovery and how it can be applied to the various systems and processes carried out in your building.

This guide is intended for anyone who has responsibility for the efficient and cost-effective operation of buildings, or those who use an industrialprocess where heat might be unnecessarily wasted. The application of heat recovery techniques can significantly reduce energy consumption, running costs and carbon emissions. These techniques can be applied in isolation, but would be better as part of an overall strategy to reduce energy, cost and carbon.

How to use this guide
This guide will help you understand the basic principles of heatrecovery as well as some of the common terminology. The main part of this guide is divided into sections which reflect the key applications for heat recovery in buildings. You‘ll find some useful tables on the next few pages to help you decide which types of heat recovery application might be of interest to you. It may also be useful for you to complete the heat recovery checklist alongside thisguide so that you can focus on the areas that are most specific to you.

The application of heat recovery techniques can significantly reduce energy consumption, running costs and carbon emissions

Technology guide

4

Heat recovery application chart by building type
Use this chart to determine which technologies and applications are most applicable to you, either by the type ofbuilding you have or the systems you have installed.

Building type Systems installed

Waste heat source and applications for heat recovery Boilers (steam or hot water)
Pre-heat combustion air Blowdown on steam boilers Flue economisers

Refrigeration (cooling plant)
High-grade heat recovery using a de-superheater Low-grade heat recovery from the condenser

Ventilation systems
Thermal wheelRun around coil

Industrial processes
Lowtemperature processes Hightemperature processes Heat pumps

Plate heat exchanger or recuperator

Page Airport Courts Food and drink Distribution – warehouses Dwellings Education Emergency services Hospital/healthcare Hospitality – hotel

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Heatpipes

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Building type Systems installed

Waste heat source and applications for heat recovery Boilers (steam or hot water)
Pre-heat combustion air Blowdown on steam boilers Flue economisers

Refrigeration (cooling plant)High-grade heat recovery using a de-superheater Low-grade heat recovery from the condenser

Ventilation systems
Thermal wheel Run around coil

Industrial processes
Lowtemperature processes Hightemperature processes Heat pumps

Plate heat exchanger or recuperator

Page Hospitality – catering Industrial manufacturing Laboratory Laundry Sport and leisure Library/museum Office Pharmaceutical...