A Technical Introduction of Water Pit for Long-term Seasonal Solar Thermal Energy Storage
Abstract
The total amount of solar energy resources is abundant, clean and widely distributed, but there are also problems such as low energy density, discontinuity and large seasonal difference of radiation amount.Water pit for seasonal solar thermal energy storage is one of the important technical routes to realiz “winter uses stored solar heat from summer” and “zero carbon heating”. It can effectively solve the mismatch of solar energy supply and demand in time and space, and it is a key technology to solve the problem that solar energy cannot be continuously utilized. The key idea of this technology is to store the solar energy collected in non-heating seasons in the water pit for spacing heating in winter. On the one hand, this technology solves the idle problem of solar collector in non-heating season; on the other hand, it can realize all-weather heating under complicated weather conditions, thus achieving a high guarantee rate of solar energy.This paper introduces the basic principle, application cases and cost analysis of water pit for seasonal heat storage, and analyzes the main problems and future research directions.