Solar phase-change cold-storage air conditioning system and control method

Abstract

The invention discloses a solar phase-change cold-storage air conditioning system and a control method. The solar phase-change cold-storage air conditioning system comprises a solar photovoltaic powergeneration grid-connected unit, a heat pump refrigerating unit, a phase-change cold-storage temperature-adjusting unit and an air conditioning terminal, wherein the solar photovoltaic power generation grid-connected unit drives the heat pump refrigerating unit, and the heat pump refrigerating unit generates cold energy through operation; water serves as a refrigerant, constant-temperature adjustment is carried out through the phase-change cold storage and temperature adjustment unit, and cooling capacity is continuously and stably provided for the tail end of the air conditioning terminal. The system comprises four operation working conditions including the simultaneous storage and supply working condition, the heat pump cold storage combined supply working condition, the pure storage working condition and the storage and supply working condition. By means of the mode, the solar phase-change cold-storage air conditioning system and the control method combine the heat pump technology,the phase-change energy storage technology and solar energy, the heat flux density can be adjusted at the constant temperature, the effective energy utilization rate is increased, and better energy-saving benefits are achieved; solar photovoltaic power generation is used for supplementing in the daytime peak electricity period, and valley electricity is utilized as much as possible to store cold at night, so that the power grid imbalance is greatly relieved.

Description

technical field [0001] The invention relates to the technical field of solar energy utilization, in particular to a solar energy phase change cold storage air conditioning system and a control method. Background technique [0002] my country's building energy consumption accounts for about 30% of the total energy consumption of social terminals, and the energy consumption generated by cooling or heating accounts for about 40%-50% of building energy consumption. Absorption refrigeration method. [0003] The electric compression refrigeration method consumes high-grade electric energy to drive the compressor to obtain cooling capacity. Due to people's living and working habits and the high ambient temperature during the day, most of the demand for building cooling loads is concentrated during the day, which brings great imbalance to the power grid. , resulting in huge power loss. [0004] The use of ice storage technology can partially solve the above problems, but the phase ...

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Problems solved by technology

[0003] The electric compression refrigeration method consumes high-grade electric energy to drive the compressor to obtain cooling capacity. Due to people's living and working habits and the high ambient temperature during the day, most of the demand for building cooling loads is concentrated during the day, which brings great imbalance to the power grid. , resulting in huge power loss

[0004] The use of ice storage technology can partially solve the above problems, but the phase change point of ice storage technology is low (0°C), and the temperature difference of phase change heat is relatively large (generally 6~7°C), which brings the operating temperature of off-peak electricity storage conditions. Lower (≤-7°C), the result is: the energy efficiency ratio of the cold storage system is lower than the COP, and the conventional air-conditioning unit cannot adapt, and the special ice-making unit must be replaced, resulting in an increase in the initial investment

[0005] As a free and clean energy, solar energy is very valuable for building heating. It can not only solve the problem of grid imbalance, but also greatly reduce operating costs. However, the intensity of solar radiation cannot be continuously stabilized due to environmental factors and incident angles. running

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