Solar energy-ground source heat pump coupled biogas pool heating system and operational control method

Abstract

The invention belongs to the field of new energy development and application, and particularly relates to a solar energy-ground source heat pump coupled biogas pool heating system and an operational control method thereof. The solar energy-ground source heat pump coupled biogas pool heating system is divided into five operating modes, namely solar energy direct heating, solar energy-ground sourceheat pump series heating, solar energy heat pump heating, individual ground source heat pump heating and solar energy underground heat storage according to the temperature gradient of hot water prepared by a solar heat collector by combining a relation curve of the COP (coefficient of performance) of a heat pump unit and the water inlet temperature of an evaporator. The method remarkably improvesthe heating efficiency of the heat pump unit and the system by fully using low-grade solar energy and ground heat energy, can supply heat to a biogas fermentation pool efficiently and stably for a long term, and has long-term economic and environmental benefits.

Description

technical field [0001] The invention belongs to the field of new energy development and application, and relates to a heating system, in particular to a solar energy-ground source heat pump coupled biogas pool heating system and an operation control method. Background technique [0002] The gradual depletion of fossil energy has caused many countries in the world to focus on the field of new energy. Anaerobic fermentation biogas technology, as a way of utilizing biomass waste, can recover energy and solve environmental pollution problems, so it has been highly valued by governments of various countries. In my country, by the end of 2005, 18 million households nationwide used biogas, and the annual production of biogas was about 6.9 billion cubic meters. At the same time, 3,500 farm biogas projects have been built, and 700 large and medium-sized biogas projects have been built nationwide. [0003] However, at present, the industrialization of biogas projects is still facing...

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Problems solved by technology

[0007] Starting from energy cascade utilization and system energy efficiency coefficient (COPs) maximization, the present invention effectively combines solar heat collection technology and ground source heat pump technology to solve the problem that a single solar heating system cannot meet the needs of biogas digesters in rainy days and winter. temperature requirements, as well as the year-round operation of a single ground source heat pump system caused by the reduction of underground temperature and the reduction of system performance coefficient, etc.

The proposed coupling system optimization design and operation control method solves the problem of optimal matching between the solar heat collection area and the installed capacity of the heat pump, and the optimal operation problem of the automatic switching of each mode of the coupling system under different climatic conditions, so as to achieve the whole system from the design To the purpose of operation economy, energy saving and environmental protection

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