The DH network of A2A in Brescia is rather old, connecting buildings from different periods mainly in low building-density area. The network started operating in 1972 and is currently running at temperature levels of 120/60°C (supply/return). The network is heated by a waste-to-energy plant (~50% coverage), in combination with a CHP, waste heat recovery from industries and peak load boilers. The total network heat demand is about 1 TWh, annually.
The A2A demo site consists of a peripheral branch of Brescia DH network for a total contract power of about 700 kWt. The goal is to lower the supply temperature in this branch to around 80°C by mixing the supply and the return water by means of a shunt installation located in the so called “mixing station”. This will result also in higher volumetric flow rates. The demo site in Brescia is added to the project since it is representative for many networks throughout Europe, and as such, there is a large replication potential for the measures taken in this project.
In a first phase, temperature lowering will be done on a trail-and-error basis, involving customers. Then the TEMPO innovations will be installed, and the additional temperature reduction will be quantified.
The goal of implementing several TEMPO innovations is to verify their effects in an operational setting and to develop a solution that is easily replicable over parts of the networks with low heat density.
The technological innovations of this demo site planned within TEMPO are:
- Supervision ICT platform;
- Visualisation tool;
- Smart DHC controller;
- Optimisation of building installation.
These innovations will be further elaborated in Work Package 1 “Final innovation development for solution package integration”, installed and implemented during task 4.3 “Implementation of the TEMPO innovations”.
The operating data will be monitored in two steps. In the first phase, until mid – 2019, the mixing station will work accordingly to the traditional network configurations. In the second phase, from mid – 2020, the mixing station will operate according to the low temperature conditions, thus, mixing supply and return water to reach the designed temperature.
To supply low temperature heat to consumers, it will be necessary to use a pump equipped with an inverter to keep pressure difference at the central point constant.
The mixing station will be equipped with instruments to perform measurements of flow, temperature, pressure and energy. The measured data will be transmitted remotely and collected by A2A.
According to the characteristics required by some innovations, transmission, communication and control systems will be installed as well.
This is a confidential deliverable in the TEMPO project. However, we will be happy to answer your questions if you are interested in similar solutions.
Please contact: Ilaria Marini [email protected].