Do not miss our special. Click here

Glass Industry News

Using hot exhaust air to drive down heating costs

, Siemens AG, Industry Sector


Many production halls are air conditioned all year round to ensure constant working and manufacturing conditions. Ventilation systems generally extract the waste heat given off by manufacturing processes and release it into the outside atmosphere. In the fall and winter, factory halls frequently also have to be heated. With a new type of solution, the company Hoval offers systems capable of recovering process waste heat, cutting factory heating bills for one of its customers by up to 88 percent. Hoval relies on automation technology from the Siemens Industry Automation Division in its systems.

The ambient temperature of a production hall is held at a comfortable 20 degrees Celsius – not just for the benefit of staff but of the machines too. This is the only way to prevent uncontrolled metal expansion and so ensure adherence to tolerances. In winter, the energy needed to heat the fresh air in the factory hall is a significant cost factor.

The company Hoval based in Liechtenstein has developed an oil-tight plate heat exchanger whose function is to recover waste process heat, and which has been specifically designed to work with exhaust air laden with dirt and oil particles as well as aerosols from industrial processes. The thermal energy in the exhaust air heats the cold fresh air by means of the heat exchanger, so improving the energy efficiency of the entire ventilation system. To control the heat exchanger and system, Hoval has opted to use Simatic ET 200S distributed I/O control technology. The control is integrated in the production automation system, and exchanges data with the building management system in order to maximize convergence and save costs.

Used at the company Aesculap in Tuttlingen, Southern Germany, the system meant an 88 percent saving in terms of fresh air heating costs. Aesculap saw its initial investment fully recouped in just three years.

The Swiss company Wito in Weinfelden took responsibility for programming, making use of the Engineering Framework TIA Portal from the Siemens Industry Automation Division: For instance for communication between the Comfort Panel TP700 operating element and ET 200S, and for adaptation to the customer’s IT network. The time required for commissioning was cut by performing the entire function testing process in advance in the office using the Simit simulation system.


, Siemens AG, Industry Sector

News material on the Site is copyright and belongs to the Company or to its third party news provider, and all rights are reserved. Any User who accesses such material may do so only for its own personal use, and the use of such material is at the sole risk of the User. Redistribution or other commercial exploitation of such news material is expressly prohibited. Where such news material is provided by a third party, each User agrees to observe and be bound by the specific terms of use applying to such news material. We do not represent or endorse the accuracy or reliability of any of the info contained in any news or external websites referred to in the news.

Should the content or the design of these sites violate third parties rights or legal prescriptions, we kindly ask you to send us a respective message without invoice or cost. We guarantee that passages where the claim is considered as justified will be removed immediately, without any necessity to involve any lawyer into this issue. We will reject any claim caused by submission of a honorary note in this regard without any prior contact and confirmation of the issueby us and we reserve the right ssue counter claim ourselves because of violation of aforesaid conditions.

Info Grid

Glass studies

Updated worldwide glass study 2020

Updated hollow glass study 2020

Request more information

Updated float glass study 2020

Request more information

Company Profile

Updated worldwide glass market study 2020 available now for flat, container glass and tableware

We have updated our international studies on flat glass, container glass and tableware for 2020.

This unique software provides a global overview about glass producers and technical details. Easy to use and clear tables summarize information and data about glass makers such as: Glass types: flat glass, container glass, tableware, production capacities in regions and countries, number of furnaces, furnace types, year of construction, glass types and sub-types, products, project information, special news and downloads.

Further databases supplying demoscopic data and import and export data complete the market survey. Based on these data, prepare individual country profiles with information about local production capacities, local market sizes and expected demand in the future.

Request your offer via

Updated Hollow glass study 2020


Updated Float glass study 2020