Interseasonal heat storage for residential buildings with renewable energy generation
2019
Kalder, J., Estonian Univ. of Life Sciences, Tartu (Estonia) | Hovi, M., Estonian Univ. of Life Sciences, Tartu (Estonia) | Allik, A., Estonian Univ. of Life Sciences, Tartu (Estonia) | Annuk, A., Estonian Univ. of Life Sciences, Tartu (Estonia)
This article describes the modelling of the energy system for a house, which includes components for heating, electricity production from renewables, energy storage and consuming devices. The electrical energy production devices are not connected to the electrical power supply grid and overproduced energy is stored in a long term storage water tank. Batteries are also included in the energy system. The energy production of the PV-panels in spring, summer and early autumn is high but the annual heat energy demand for a house is nearly zero. Therefore, it is sensible to use the power plant in grid connected mode and the grid acts like a storage, where is it possible to sell the overproduced energy. The aim of this research is to investigate a solution that uses as much as possible of the produced energy locally, storing the energy in the vacuum insulated tank as heat, if batteries are full. The energy that is stored in the tank can be used at the beginning of the heating season. This article is based on modelling of the proposed heating system. The inputs for the model are production data from PV panels and a wind generator, climate data (outside temperature) and the heat and electricity demand of the example house. Storing overproduced energy as heat in the vacuum insulated tank, will increase the share of locally produced energy, and therefore decrease import of electrical and other sources of energy. The results show, if the yearly renewable energy production is 13000 kW•h and the house yearly energy demand is 12981 kW•h, then over 79 % of overall energy demand can be covered from renewable energy sources, if the solar/wind share is 30/70 %. With the solar/wind ratio 70/30 %, the coverage is over 60 %.
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