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Cascade type supercooling method ice storage system

A cascading, ice-storage technology, applied in air-conditioning systems, refrigerators, heating methods, etc., can solve the problems of slow melting speed, low heat transfer efficiency, low energy efficiency ratio, etc., to eliminate ice crystals, ensure stability, The effect of preventing ice blockage

Pending Publication Date: 2019-06-28
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional ice storage system generally adopts two methods of ice-coil type ice-making and ice-puck type ice-making. This method generally adopts a dual-working mode host, with low evaporation temperature and low energy efficiency ratio (COP). During the ice-making process, duplex The performance of the main engine degrades rapidly, the ice melting speed is slow and the heat transfer efficiency is low during the cooling process

Method used

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  • Cascade type supercooling method ice storage system
  • Cascade type supercooling method ice storage system
  • Cascade type supercooling method ice storage system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 2 As shown, the two-way pump 2 rotates forward, the upper end of the chiller 1 enters water, and the lower end outputs water. The preheating of the heat exchanger 12 uses 7°C chilled water directly from the chiller 1 .

[0033] During the day, the chiller is used for cooling alone: ​​open valves V1 and V3, close valves V2 and V4, the 7°C chilled water flowing out from the lower end of the chiller 1 enters the terminal equipment 14 through the valve V3 for heat exchange, and the 12°C chilled water flowing out of the terminal equipment 14 is refrigerated The return water is pumped back to the chiller 1 by the bidirectional pump 2 through the valve V1 to complete the cooling cycle.

[0034]Ice storage at night: Turn on the low-temperature condenser 3, throttle valve 4, compressor 5, and evaporator 6, and the refrigerant liquid evaporates in the evaporator 6, taking away the -0.5°C brine pumped by the brine pump 7 of heat, cooling the brine to an outlet tem...

Embodiment 2

[0039] Such as image 3 As shown, the two-way pump 2 is reversed, water is discharged from the upper end of the chiller 1, and water is fed from the lower end. The preheating of the heat exchanger 12 uses the 7°C chilled water of the chiller 1 that is heated by the low-temperature condenser 3 and returns to the chilled water.

[0040] The working process of independent cooling by the water chiller during the day, independent cooling by the ice storage tank during the day, and joint cooling by the chiller and the ice storage tank during the day is the same as that in Embodiment 1, and will not be repeated here.

[0041] Ice storage at night: Different from the first embodiment, the 7°C chilled water flowing out from the chiller 1 cools down the low-temperature condenser 3 first. Specifically, the 7°C chilled water flowing out from the upper end of the chiller 1 enters the low-temperature condenser 3 through the valve V2 to cool down the high-temperature refrigerant steam, and t...

Embodiment 3

[0044] Such as Figure 4 As shown, the difference from the first and second embodiments is that the preheating of the heat exchanger 12 uses the high-temperature refrigerant vapor split from the outlet of the compressor 5 .

[0045] The working process of independent cooling by the water chiller during the day, independent cooling by the ice storage tank during the day, and joint cooling by the chiller and the ice storage tank during the day is the same as that in Embodiment 1, and will not be repeated here.

[0046] Ice storage at night: The two-way pump 2 can be reversed. The 7°C chilled water flowing out of the chiller 1 enters the low-temperature condenser 3 to cool down the refrigerant steam, and then flows back to the chiller 1 through the valve V7 to complete the cycle. A part of the high-temperature refrigerant steam coming out of the compressor 5 enters the second heat side of the heat exchanger 12 through the valve V10 to exchange heat with the low-temperature water,...

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Abstract

The invention discloses a cascade type supercooling method ice storage system. The cascade type supercooling method ice storage system comprises a water chilling unit, a double-way pump, a low-temperature condenser, a throttling valve, a compressor, an evaporator, a refrigerating medium pump, a supercooling heat exchanger, a supercooling reliever, an ice storage groove, an ice storage pump, a heatexchanger and end equipment; the water chilling unit, the double-way pump and the end pump form a cold supply loop; the water chilling unit, the double-way pump, the cold side of the low-temperaturecondenser and the first hot side of the hot exchanger form a refrigerating / preheating loop; the hot side of the low-temperature condenser, the throttling valve, the cold side of the evaporator and thecompressor form a refrigerating agent loop; the hot side of the evaporator, the cold side of the supercooling heat exchanger and the refrigerating medium pump form a refrigerating medium loop; and the hot side of the supercooling heat exchanger, the supercooling reliever, the ice storage groove, the ice storage pump and the cold side of the heat exchanger form a supercooling loop. The cascade type supercooling method ice storage system is high in operating reliability, can effectively reduce the energy consumption of an ice making system and can increase the system COP; meanwhile, the prepared dynamic ice slurry is high in cooling speed and high in heat exchange efficiency, and the operation cost and the initial cost are greatly reduced.

Description

technical field [0001] The invention relates to the field of ice storage, in particular to a cascade supercooling ice storage system. Background technique [0002] The application of cold storage systems can improve the power supply efficiency of urban or regional power grids, optimize the power supply system, transfer power peaks, balance power grid loads, and greatly reduce user electricity bills. [0003] The cold storage system mainly includes sensible heat storage and latent heat storage. Ice cold storage is a cold storage method that utilizes the latent heat of water phase change. The cold storage density of ice at 0°C is as high as 334KJ / kg. To store the same amount of cold, the volume required for ice cold storage It is only a few tenths of water cold storage, which greatly reduces the volume of cold storage. More than 75% of the cold storage projects built at home and abroad use ice cold storage systems. [0004] The traditional ice storage system generally adopts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F5/00F25B41/04F25B41/20
CPCY02E60/14
Inventor 董凯军苏林孙钦
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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