Double-temperature-region energy accumulating heating solar hot water system and working method thereof

Abstract

The invention discloses a double-temperature-region energy accumulating heating solar hot water system and a working method thereof. The system is used for providing household hot water for a common household family or providing a heat dissipator to heat in winter; when the system operates in summer, a composite phase change energy accumulating material accumulates and releases energy in a high phase change temperature region and heats circulating water in a water storage tank directly through a gravity heat tube; when the system operates in transitional seasons and winter, the composite phasechange energy accumulating material accumulates and releases energy in a low phase change temperature region; heat is transferred to the gravity heat tube and an evaporator of a heat pump at the sametime, and circulation of the heat pump is started to produce hot water. Compared with the prior art, the system provided by the invention has the beneficial effects that solar energy can be utilizedto the maximum extent in different operating modes in seasons, the system is high in energy efficiency ratio and simple and compact in structure and prevents frost crack and heat loss in winter, and the energy efficiency of the system in winter and summer is improved comprehensively.

Description

technical field [0001] The invention belongs to the field of solar heat utilization, and relates to a dual temperature zone energy storage heating type solar water heating system and a working method thereof. Background technique [0002] With the rapid development of the national economy and the improvement of people's living standards, people's requirements for popularizing hot water supply and improving hot water supply technology are becoming more and more urgent. The energy demand for heating and domestic hot water has become an important part of the energy consumption of general civil buildings. . According to the "China Energy Development Report 2016" issued by the General Institute of Electric Power Planning and Design, coal consumption still accounted for a large proportion of primary energy in 2016, and building energy consumption increased by 7.0% year-on-year. On the basis of improving the utilization rate of existing energy, development and The use of renewable...

AI Technical Summary

Problems solved by technology

[0005] The energy storage material used in the current energy storage solar heat pump system has only one phase transition point, which cannot meet the energy storage requirements when the solar radiation intensity differs greatly between winter and summer and the temperature in the collector is different.

The heat collector, heat accumulator, and evaporator are arranged separately, the system is relatively complicated, and the manufacturing cost is high. The heat transfer medium is used to extract heat from the heat accumulator as the low-level heat source of the heat pump. The heat loss of the secondary heat transfer is large, and the water system is in winter. There is a danger of pipeline freezing and cracking at night

[0006] In the Chinese patent CN200810020470.9 "Composite source heat collection / energy storage / evaporation integrated heat pump hot water system", the heat pump evaporator is arranged in the solar vacuum heat collection tube in the form of a U-shaped tube, and each evaporation tube is in the middle of the solar vacuum heat collection tube The heat collector / energy storage / evaporator is filled with phase change materials, and then connected in parallel with the evaporator of the air source heat pump. The operation mode can be switched according to the solar radiation, but the compressor needs to be turned on throughout the year, and the system consumes a lot of energy.

[0007] In Chinese patent CN201410161999.8 "A high-efficiency energy-storage solar heat pump heating method for all-weather operation", the oscillating heat pipe is used as a medium to transfer the heat stored in the phase change material in the collector to the composite heat exchanger, and the composite heat exchanger is directly heated in summer. The circulating water in the heat exchanger transfers the heat to the evaporator in the compound heat exchanger in winter, which improves the heating efficiency of the heat pump system, but the structure of the compound heat exchanger is complicated, the processing is difficult, and there are many solder joints and it is easy to leak

[0008] In the above two patents, the condenser and the water tank are arranged separately, the system occupies a large area, and the heat transfer loss of the pipeline is large, and the influence of the temperature difference in the collector in different seasons is not considered.

Images