Heat recovery in sustainable cities

There is enough waste energy worldwide to heat all buildings, yet waste heat recovery examples are scarce. The best energy is the one not used, and the next best is the one reused. We can repurpose energy from industries and urban sources like data centers, metro stations, supermarkets, and underground mines. This recovered heat can be used locally, such as in space and tap water heating. Additionally, it can be sold for district heating purposes.

hvac heat recovery in sustainable cities hero final
Kemira case

Cooled acid turns to district heating

Since 1974 Kemira has, efficient and reliable, been selling energy to the city of Helsingborg.

The best energy is the one not used, and the next best energy is the one reused."

Following a total reconstruction of the cooling system at the Kemira sulphuric acid plant, the temperature of the cooling water has been raised to a level at which it can be used for district heating.

Read more


Trend in Industry

To keep the global warming target of 1.5 °C alive, we need to triple the installed capacity of renewable energy and double the rate of global energy efficiency improvements by 2030. Use of the excess heat available worldwide will be essential and a great opportunity to achieve this. Only in EU, the available excess energy is expected to surplus 2000 TWh in 2050 which could cover almost the full heat demand for space and tap water heating (Mathiesen 2023).

The excess heat is generated both from industrial processes and urban sources such as wastewater treatment plants, data centres, hospitals, and the metro. New solutions for heat reuse are being deployed every day. However, location, infrastructure, and demand patterns often cause heat to be lost.

  • 22 countries in EU could cover more than 50 % of their current energy demand with excess heat.
  • Low temperature excess heat from wastewater treatment plants, 442 TWh/year, and data centres, 221 TWh/year, can be lifted with industrial heat pumps to temperature levels suitable to supply the district heating grid.
  • By improving the energy efficiency and preparing buildings for low temperature heat distribution we can reduce heat losses in the district heating system and allow utilization of lower grade excess heat sources. In doing so the Coefficient of Performance (COP) of industrial heat pumps are improved even further.
  • 30 % of the electricity in hydrogen production is converted to heat. When planning hydrogen plants, the location should be carefully selected to allow heat recovery while providing cooling to the electrolyser.
  • Expansion of water-carried systems such as district energy and heat networks will be a crucial enabler to distribute excess heat.
  • Fit for 55 package: cities in EU larger than 45 000 citizens will be required to produce a heating and cooling plan with mapping of the available energy to facilitate sector coupling and deployment of essential energy infrastructure.
  • When cooling residential and service buildings with individual chillers, heat is produced as a by-product. This heat should be used for tap water heating or used to provide efficient cooling with an absorption chiller.

Why you should recover excess heat with Alfa Laval

  • 99.9% of data centres’ electricity becomes excess heat. Our technology enables harnessing and reusing it for net-zero energy consumption.
  • Alfa Laval has a broad range of contact points to connect energy companies to heat networks and district energy networks.
  • With millions of heat exchangers in operation worldwide and an extensive R&D program for heat exchangers, we offer the most reliable solution.
  • We have reference units in both industrial and urban excess heat applications to provide heat for district heating.
  • All our plate heat exchangers have AHRI certification, ensuring superior thermal performance. Don’t take just our word for it.



  • 高い熱効率を確保しながら、任務に適応できる柔軟なソリューション
  • コンパクトな設計はスペースを節約し、サービスやメンテナンスが容易
  • ファウリング、ストレス、腐食を軽減し、最大限の稼働時間を実現するソリューション




  • 圧力や温度の疲労を引き起こす可能性のあるアプリケーションに対して、非常に効率的で信頼性の高い技術
  • アルファ・ラバル独自のRefTight™シーリングシステムのおかげで、長いシーリング寿命を保証
  • 媒体間の交差汚染を防ぐための信頼性の高いソリューション




  • コンパクトなフットプリントを持つ軽量の銅ろう付け構造
  • 同等のシェルアンドチューブよりも高い熱効率
  • さまざまなアプリケーションに適合する柔軟なオプションで、すべての異なるタイプの媒体/流体に対応
  • 天然および低GWP(地球温暖化係数が低い)冷媒に理想的



AlfaNova フュージョンボンデッド熱交換器

  • 真の100%ステンレス鋼構造
  • 攻撃的な媒体に対する強い耐食性
  • 飲料水やその他の衛生的な用途での金属汚染を防ぐ
  • 高い熱効率とコンパクトなフットプリント


コンサルタント? システムインテグレーター?

コンサルタントですか? こちらをご覧ください! 熱交換に関する数十年の経験から得た専門知識を持つアルファ・ラバルは、今日の暖房および冷房の課題に対する知識豊富なリソースを提供します。エネルギー効率から自然冷媒まで、複雑な質問に対する答えを発見し、アプリケーションに適した技術を見つけるための便利なツールをご利用いただけます。

heating cooling-hub-vignette-2021



energy hunter screen view

Hunting for excess heat

Alfa Laval heat exchangers have been used to recover heat for almost a century. Our energy-efficient solutions support heat reuse in diverse applications, from water and oil-cooled data centres to industrial processes like sulphuric acid plants. Join us in our search for heat-saving opportunities and discover how much you can reduce your energy bill with our solutions.

Learn more

The Energy Efficiency Movement

The Energy Efficiency Movement, initiated by ABB, aims to create awareness and foster actionable change as a community. At Alfa Laval, we recognize the importance of working together to scale up energy-efficient solutions. That's why we were the first company to join the movement at COP26. With our extensive network, we can connect key industry players and help pave the way to a net-zero future.

Learn more

energyefficiencymovement with logo vignette image





smart heat exchanger sensor lighten 640







ALF0739 sustainable-cities hero 640x3.

Contact us

上記の情報は、 当社のプライバシーポリシーに従って保存および処理されます。