Energy-saving dynamic plate ice heat pump

Abstract

An energy-saving dynamic plate ice heat pump comprises a heating main circulatory system and a hot gas bypass branch; evaporators fall into sets; blow expansion type evaporators in each set are connected in parallel; ice is molten and made in turn by each set of evaporators; the heating main circulatory system operates for continuously heating all the time; the evaporators in the hot gas bypass branch communicate with a high-pressure liquid storage device through a refrigerant pump; part of liquid refrigerants is used for cooling overheated gas through a liquid return valve; the ice melting process is mild and stable; the system circulatory process is stable and efficient; the unit matching cost is low; the water-ice phase change latent heat can be efficiently extracted for heating; the ice making evaporators are low in cost, high in heat transfer efficiency and high in evaporation temperature; the power consumption is low; and the ice making capacity is high.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to an energy-saving dynamic plate ice heat pump. Background technique [0002] Air source heat pumps take into account the advantages of cooling and heating, small space occupation, energy saving, environmental protection, and convenience. An important factor of thermal capacity and operating efficiency, its design conditions must also meet the local extreme low temperature conditions, resulting in high power configuration of air source heat pump units, high overall cost, and low efficiency. Water source heat pump is a high-efficiency energy-saving cooling and heating device, but it needs a large amount of warm water resources at 10°C-25°C. In winter, warm water resources above 10°C are seriously insufficient in northern regions. At present, the large-scale application of water source heat pumps is very strictly restricted. Turning water into ice can release a large amount of...

AI Technical Summary

Problems solved by technology

Conventional ice machines such as plate ice machines, flake ice machines, block ice machines, etc. can extract the latent heat of phase change of water and ice in winter, and can also produce ice and store ice during the low-cost off-peak electricity period at night in summer. Below -18℃, the energy consumption is high, the investment is large, and the economy is poor

Conventional plate ice machines use tube-plate heat exchangers or plate-plate heat exchangers. Tube-plate heat exchangers or plate-plate heat exchangers are made of stainless steel plate brazing or laser welding, which is expensive and has low heat transfer efficiency.

At present, conventional plate ice machines usually use hot fluorine to defrost and de-ice. The ice-making cycle system of the unit operates intermittently, which has low efficiency, and has high requirements on the compressor and its refrigeration system. In addition, the evaporation temperature of ice-making is very low. Low-temperature impact-resistant compressors and their accessories are required, and the system configuration cost is too high; the precise control of the expansion valve on the circulating refrigerant flow directly affects the stability, capacity, and efficiency of the system. The patent application "A Hot Gas Bypass Pressurized Return Continuous Defrost device" provides a hot gas bypass pressurized return continuous ice melting device, which ensures the precise control of the expansion valve during the defrosting process, and the cycle stability of the whole unit has been greatly improved, but the temperature of the hot gas at the outlet of the compressor is usually very high. High, can exceed 100 ℃, superheated gas directly enters the ice-melting evaporator, which will cause uneven heating and cooling of the evaporator, and easily cause deformation of the evaporator, affecting the selection of the evaporator, the deicing performance and the service life of the evaporator

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