Marlies Wiegand

Marlies Wiegand
Fachhochschule Westküste · Faculty of Engineering

M.Sc. Environmental Sciences and Sustainability Sciences
You can find me on LinkedIn https://www.linkedin.com/in/marlies-wiegand-636827228/

About

19
Publications
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23
Citations
Introduction

Publications

Publications (19)
Conference Paper
Full-text available
Die Effizienz von Wärmenetzen steht in engem Zusammenhang mit der Rücklauftemperatur, die idealerweise unter 40 °C gehalten werden sollte. Verträge mit Wärmeversorgungsunternehmen legen häufig dezentrale Rücklauftemperaturen unter 40 °C fest. Aufgrund von Legionellenprävention, insbesondere bei Speicher-Trinkwassererwärmern, ist eine Unterschreitun...
Article
Full-text available
Die Absenkung der Rücklauftemperaturen in bestehenden Wärmenetzen spielt eine wichtige Rolle für die Effizienz verschiedener Wärmequellen sowie für die Effizienz und Kapazität von Wärmespeichern. Dementsprechend werden in den technischen Anschlussbedingungen heute häufig gebäudeseitige Rücklauftemperaturen von 40 °C oder weniger gefordert. Aufgrund...
Article
Full-text available
A major issue in the renewable energy supply of buildings is to establish a simultaneity of the fluctuating renewable energy generation and the energy consumption in buildings. This work provides a new case for a better understanding of how to establish this simultaneity. Future solutions are being explored in practice on the campus of the FH Westk...
Article
Ob mit oder ohne Brennwertnutzung: Die Tage der mit fossilem Öl befeuerten Heizung sind gezählt. Vor 1991 errichtete Heizkessel dürfen nicht mehr betrieben werden (GEG, § 72 [1]), neuere Heizkessel dürfen nur bis zum Ablauf von 30 Jahren seit Aufstellung laufen. Ab 2026 dürfen Ölkessel nur in Kombination mit erneuerbaren Energien in Betrieb genomme...
Conference Paper
Full-text available
Thermochemical solid/gas sorption systems are known for their environmental benefits. They can use low-grade temperature sources for supplying cold storage and cooling of buildings. The thermochemical working pair calcium chloride/methanol is well suited for sorption refrigeration and storage due to low costs, high energy density and good cyclabili...
Article
Full-text available
Iron-oxidizing bacteria (FeOB) can successively populate low-nutrient aquatic environments and adapt to a broad concentration range of alkaline earth metals, with optimum conditions widely differing from one species to another. For the most abundant known FeOB genera Gallionella and Leptothrix, there is a lack of reports on substrate affinity for c...
Conference Paper
Full-text available
The operation of heating and cooling water loop systems depends on a combination of physico-chemical as well as biotic factors. Microorganisms present in water loop systems play an essential role in the clogging of pipes and other components as well as in the degradation of metal materials. Some single microorganism species have received significan...
Poster
Full-text available
The operation of heating and cooling water loop systems depends on a combination of physico-chemical as well as biotic factors. Microorganisms present in water loop systems play an essential role in the clogging of pipes and other components as well as in the degradation of metal materials. Some single microorganism species have received significan...
Article
Full-text available
Corrosion and clogging are hidden hazards in various engineered systems dealing with water as storage or heat transfer medium. The related efficiency and serviceability losses may entail expensive remedial measures and costs up to the range of millions (€). Especially modern low-exergy installations are affected. They may suffer from oxygen ingress...
Data
Gallionella ferruginea isolated from iron-oxidizing microbial mat material of an iron-rich artificial pond in Lueneburg (Germany)
Conference Paper
Full-text available
Interior corrosion and clogging pose a serious threat to modern heating and cooling installations in buildings. Traditional pipe systems used to be tightly closed and highly resistant to corrosion due to alkaline passivation and protective magnetite coatings. In contrast, modern energy-efficient low-exergy installations may suffer from oxygen ingre...
Article
Das Thema der Korrosion in wasserführenden Systemen zur Wärme- und Kälteversorgung gewinnt zunehmend an Bedeutung. TGA-Anlagen- und Gebäudebetreiber müssen unter Umständen mit Effizienzproblemen oder sogar mit dem Ausfall der Technik rechnen. Doch Lösungsansätze sind in greifbarer Nähe.

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