Energy storage type natural water source heat pump air conditioning system and control method thereof

Abstract

The invention discloses an energy storage type natural water source heat pump air conditioning system which comprises a heat pump system loop, a circulating water loop, an energy storage loop and an energy supply loop; the heat pump system loop and the circulating water loop exchange heat through a condenser; the energy supply loop and the circulating water loop independently flow through an air conditioner tail end, and the energy supply loop further comprises an energy storage water tank connected with the air conditioner tail end in series; the energy storage loop comprises an energy storage water tank and a phase change energy storage system connected with the energy storage water tank in series; and an energy storage and energy supply branch is further included, the energy storage and energy supply branch comprises the energy storage water tank, a water inlet of the energy storage water tank is further in bypass connection with the circulating water loop located between the condenser and the air conditioner tail end, and a water outlet of the energy storage water tank is further connected with a water inlet of the air conditioner tail end in the circulating water loop. According to the energy storage type natural water source heat pump air conditioning system, the peak-load shifting capability of a power grid is enhanced, and the cost is reduced; and the system is high in energy efficiency and stable in energy supply.

Description

technical field [0001] The invention relates to the technical field of heat pump air conditioners, in particular to an energy storage type natural water source heat pump air conditioner system and a control method thereof. Background technique [0002] With the development of my country's economy and society, the energy consumption of building air conditioners is gradually increasing, and the electricity load in urban load-intensive areas such as residential areas and CBDs continues to rise and hit new highs repeatedly. Taking the provinces in the Yangtze River Basin as an example, the proportion of air-conditioning load in summer in Jiangsu, Zhejiang, Hubei, and Chongqing exceeds 40%. During the peak period of power load, due to the small adjustment margin of the operation mode, the pressure on the power grid operation is high, the heavy load and overload of power transmission and transformation equipment are serious, and the energy expenditure cost of users is also greatly...

AI Technical Summary

Problems solved by technology

However, the system is still limited to using the sensible heat of water to store heat, and the increase in energy storage density is limited. It cannot meet the long-term stable heat release during peak power periods during the day, and it cannot utilize clean solar energy, which makes the overall system energy efficiency poor. not tall

[0005] Chinese patent 201911377928.0 discloses a solar-river water source heat pump combined heating system, including a phase-change heat storage module, which forms a circuit with an evaporator and a solar collector in turn, and the evaporator and a condenser form a circuit, which solves the problem of The problem of unsustainable heating in the existing solar heating system and the low utilization rate of energy stored in the phase change heat storage device

However, this system can only achieve low-temperature phase change heat storage, and its energy storage density is not high. At the same time, because the external heat source of the entire system is solar energy, it will not be able to provide energy for the phase change heat storage module and the evaporator side when the sunlight intensity is low during the day. steady heat input, the system is less stable

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