PVT Solar Panel for Local Heating network - Energy - Solar Power
The deZONNET heat network is a local heat network for new construction and the transformation of existing gas-fired to fossil free neighborhoods. All houses have Triple Solar PVT solar panels on their roof and supply electricity and source heat to a heat pump. There is heat left over in the summer: this heat is dissipated via a heat network and stored in the soil in the ATES (Heat Cold Storage). In the winter, when the PVT heat pump panels do not provide sufficient heat for the heat pump, the stored heat is extracted from the soil and supplied to the heat pumps in the homes via the heat network. This not only leads to a natural fossil free solution, but also to an immediate maximum saving of CO₂.
The innovation is a combination
The individual parts of the deZONNET concept have already been applied many times. The combination of PVT heat pump panels, heat pumps, a low temperature network and seasonal storage at neighborhood level is new.
- Significantly lower electricity consumption: The heat pump receives a higher source heat source temperature than from a normal ATES (Heat Cold Storage), which leads to a lower electricity consumption of the heat pump. The COP (coefficient of performance) is very favorable, also with relatively moderately insulated homes.
- ATES is possible in (existing) residential areas with a predominantly heat demand: with a ATES, the amount of stored heat in the soil must be in balance with the amount of extracted heat. This is done with conventional heat and cold storage by heat supply in winter and cold supply (= return heat is stored in soil) in the summer. With the ZONNET the surplus of the PVT heat is stored. This is more efficient than, for example, surface water or air collectors (dry coolers).
- Far fewer PVT panels required than with solutions without connection to a district heating network: The amount of PVT panels does not have to be dimensioned for the peak load in the winter. All surplus PVT heat in the summer is stored in the ATES for use in the winter.
- Heat Cold Storage can be smaller than with conventional systems, because the heat comes directly from the PVT in the off-season.
- Neighborhood solution: not all homes have to install PVT themselves and can still benefit.
- Far less drilling is required for an ATES than for individual (vertical) bottom loops. The number of drillings is dropping from 1 per home to around 1 drill per 100 homes (Heat Cold Storage).
- In addition to heat, the PVT supplies an amount of electricity that is almost sufficient for the heat pumps, the ATES pumps and the transport pumps in the heat network. The heat supply is therefore not at the expense of sustainable electricity generation.