Thermal distribution

This chapter covers all parts of the existing demonstrator which transport thermal energy from of liquid from one place to an other.

Thermal distribution

Various thermal grids are installed in the NEST building. The high, medium and low temperature grids are static grids without a defined flow direction. This means that the flow direction can sometimes switch. The grids are interconnected by heat exchangers. The thermal grids transport energy from the producers to the individual consumers and the individual units.

High temperature grid (HTE)

The high-temperature grid is required to generate domestic hot water for the buildings. The grid is connected to the storage tanks. The grid is mainly supplied from the high temperature heatpump in the ehub and the high temperature heat exchanger from the Empa Areal. In order to maintain the temperatures in the static network at partial load operation of the units, one circulation line is provided for the supply flow and one for the return flow.

Medium temperature grid (MTE)

The medium temperature grid is required to heat the buildings. The grid is connected to the the storage tanks and mainly supplied from the low temperature heatpump, the sfw CO2 heatpump and the high temperature heat exchanger from the high temperature grid. In the future, the supply will also be provided via the high temperature heat exchanger from the Empa Areal. In order to maintain the temperatures in the static network at partial load operation of the units, one circulation line is provided for the supply flow and one for the return flow.

Low temperature grid (NTE)

The low temperature grid is required to cool the buildings. The grid is connected to the the storage tanks and mainly supplied from the low temperature heatpump in the ehub and the low temperature heat exchanger from the Empa Areal. In order to maintain the temperatures in the static network at partial load operation of the units, one circulation line is provided for the supply flow and one for the return flow.

Low temperature grid (NTE) for AC Systems

This grid is used only for AC systems in the Backbone. The grid is connected and supplied from the low temperature heat exchanger from the Empa Areal.

Domestic hot water grid (SAN)

The domestic hot water grid is connected to a fresh water stations and boiler and the high temperature grid.

Glycol grid (GLY)

The glycol grid connects the thermal storage (Icestorage, geothermal ground heat exchanger and therm pipe) with the other grids and the low temperature heatpump.

Attachments

available with a login:
http://info.nestcollaboration.ch/wikipediapulic/data/getstarted/process/