Monitoring of a cold local heating network with wastewater heat exchanger

In Wiesbaden Biebrich, a new housing development is supplied with heat via a cold local heating network and waste heat from a sewer. Decentralized heat pumps in the single-family and multi-family homes raise the temperatures to a usable level. When fully expanded, ESWE Versorgung AG will thus provide up to 500 MWh of heat.

The wastewater heat exchanger, which was subsequently installed in a wastewater collection channel, has a transfer area of over 151 m² and an extraction capacity of 340 kW and provides the heat pumps with high source temperatures for efficient Heitz operation.

The Solar and Plant Engineering Department is conducting scientific monitoring of the innovative heat supply project on behalf of the Landes Energie Agentur Hessen (LEA).

Extensive data of the heat exchanger, the network and the heat pumps are collected and evaluated. For this purpose, the solar and plant engineering department has a large number of self-developed digital tools (algorithms) for the automated processing and analysis of measurement data.

Based on this, an energetic evaluation and the evaluation of the operating behavior as well as an ecological and economic evaluation are carried out. In addition, anomalies in the plant operation are identified and suggestions for optimization measures of the investigated plant are developed.

The focus of the scientific monitoring is on the evaluation of the function and efficiency of the overall system. The aim is to support further implementations of such systems with operating experience, characteristic values and recommendations.

Duration

01.04.2021 - 31.03.2025

Carried out on behalf of: LEA LandesEnergieAgentur Hessen GmbH

In the context of: "Scientific support of projects in the context of the energy transition".

(translated by deepl)