Waste heat recovery in production is often misunderstood

Many companies believe that rising energy costs are the problem. This is exactly where the thinking error lies. Waste heat is produced in almost every production process. A large part of it is removed unused, via exhaust air, exhaust gases or cooling systems. At the same time, investments in external energy supply are increasing.

It's not a resource issue. It is a thinking problem. Utilization of waste heat is often regarded as an additional technical solution. In reality, it is about the question How energy in the overall production system is used.

KEY FACTS: USING WASTE HEAT INSTEAD OF LOSING IT

• In production plants, large parts of energy used lost as waste heat
• Traditional individual measures draw on Potential of waste heat recovery rarely off
• Economically relevant effects only arise as a result of systemic integration
• waste heat can for processes, media and infrastructure used multiple times will
• Energy efficiency is achieved by Interaction of sources and sinks
• Correctly implemented reduces waste heat recovery Energy costs, CO₂ emissions and dependencies
• The ROI depends primarily from system design, not dependent on individual technology

WHY WASTE HEAT RECOVERY IN PRODUCTION IS OFTEN MISUNDERSTOOD

Many companies invest in heat recovery and expect immediate efficiency gains. In practice, results often fall short of expectations. The reason is rarely technology. The reason is the approach.

Waste heat recovery is thought of in isolation, not as part of a system.

WHY WASTE HEAT RECOVERY IN PRODUCTION IS CRUCIAL TODAY

In many industrial processes, heat is produced as a by-product:

• through machines
• through thermal processes
• through compressed air systems
• through exhaust air and exhaust gases
• through cooling processes

This energy is often discharged unused. This is not only inefficient, but is also increasingly problematic from an economic point of view. This is because every kilowatt hour that is not used must be purchased at a high price elsewhere. The use of waste heat in production therefore does not primarily mean sustainability.

It means: Cost control, security of supply and competitiveness.

THE MISTAKE OF THINKING: WASTE HEAT RECOVERY AS AN INDIVIDUAL MEASURE

Many companies invest in heat recovery — and are disappointed with the results.

Why Because waste heat recovery is often thought of in isolation:

• A heat exchanger here
• A heat pump there
• A use for building heating

The problem: These measures fall short because they do not take into account the overall system.

It is not the individual technology that determines success. What is decisive is how energy flows interact throughout the company.

WHAT DOES WASTE HEAT UTILIZATION MEAN IN INDUSTRIAL PRACTICE?

Waste heat recovery describes the Recirculation of unused thermal energy into usable processes within a company. The aim is to keep energy in the system for as long as possible and to use it several times.

Typical areas of application:

• process heat
• Preheating of air or media
• water heating
• Support for production processes
• secondary: Hall heating

Important here: The temperature level of the waste heat determines its usability.

This is exactly where it is decided whether a solution is technically reasonable and economical.

CLASSIC SOLUTIONS VERSUS SYSTEMIC APPROACH

Classic Approach

• Focus on individual heat source
• Use of standardized technologies
• Used mostly only for heating
• limited increase in efficiency

Systemic approach

• Analysis of all energy sources and sinks
• Linking processes and infrastructure
• Prioritizing process integration over building heating
• maximum use along the entire energy chain

The difference is decisive:

While traditional approaches “reclaim” energy, a systemic approach ensures that it is not lost in the first place.

TECHNICAL CLASSIFICATION: WHICH SOLUTIONS ARE POSSIBLE?

Depending on the process and temperature level, different technologies are used:

heat exchanger

• direct transfer of heat between media
• efficient with stable processes

heat pump

• Use of low-temperature waste heat
• Increase to a usable temperature level

Heat recovery systems

• Integration with ventilation and exhaust systems
• continuous use of process waste heat

But:

Technology is never the starting point.
It is the result of systemic planning.

COST-EFFECTIVENESS: WHY WASTE HEAT RECOVERY PAYS OFF

Many companies underestimate the economic lever. Any unused waste heat is a permanently paid but unused energy source.

When implemented correctly, waste heat recovery offers:

• significant reduction in energy costs
• short payback periods
• reduced dependence on energy prices
• higher planning security

The decisive factor is not the investment itself. The decisive factor is how precisely energy flows are analysed and used. A well-founded preliminary analysis shows whether and where an assignment is economically worthwhile.

THE SYSTEMIC VIEW: ENERGY FLOWS INSTEAD OF INDIVIDUAL MEASURES

Many companies are investing in the wrong place. They optimize components instead of understanding the system.

A systemic approach looks at:

• Where is heat generated?
• Where is heat needed?
• What are the temperature levels?
• What are the time dependencies?

This is the only way to create a meaningful solution. INFRANORM^® follows exactly this approach: Energy flows are analysed as an overall system, not as the sum of individual measures.

The result is solutions that:

• are integrated in a technically meaningful way
• are economically viable
• have a long-term effect

PRACTICAL RELEVANCE FOR DECISION MAKERS

For managing directors, production managers or facility managers, this means in concrete terms:

• Waste heat recovery is not an individual project, but a strategic decision
• isolated measures rarely lead to maximum ROI
• Real efficiency only comes from system integration
• Investments must be based on real energy flows

Anyone who ignores this is investing — but not necessarily in a meaningful way.

CONCLUSION

The use of waste heat in production is wrongly considered in many companies. It is a key lever for economic efficiency. The biggest mistake is not not to use waste heat. The biggest mistake is thinking them wrong. Traditional approaches fall short because they ignore the system. Only when energy flows viewed holistically , real efficiency is created.

For decision makers, this means:
The focus is not on technology — but on understanding the entire production system.

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FAQ

What is waste heat recovery in production?

Waste heat recovery means recovering unused thermal energy from production processes and using it for other applications in the company in order to reduce energy losses.

Why is waste heat not used in many companies?

There is often no systemic analysis of energy flows. Instead, individual measures are being implemented that do not exploit the overall potential.

What are the benefits of using waste heat for companies?

It lowers energy costs, reduces CO₂ emissions, increases supply security and improves production efficiency.

Which technologies are used to utilize waste heat?

Typical solutions include heat exchangers, heat pumps and heat recovery systems — depending on temperature level and process.

When does waste heat use make economic sense?

When energy sources and sinks can be linked together in an operational manner and the investment is amortized within a reasonable period of time through savings.