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Micro-pressure operating adsorption refrigerating system

A technology of adsorption refrigeration and micro-positive pressure, which is applied in the direction of refrigerators, refrigeration and liquefaction, adsorption machines, etc. It can solve the problems of unstable performance and high equipment requirements, and achieve improved safety and stability, low cost, and shortened cycles. cycle effect

Inactive Publication Date: 2010-06-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of high requirements on system equipment and unstable long-term operation performance of the refrigeration working fluid used in the existing adsorption refrigeration system, and provide a heat-driven adsorption refrigeration system with micro-positive pressure operation. The system adopts heat transfer The heat exchanger with excellent effect is used as the adsorber, and the operating pressure is slightly higher than the ambient pressure (0.10-1.00MPa), realizing continuous and stable refrigeration

Method used

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  • Micro-pressure operating adsorption refrigerating system

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Effect test

Embodiment 1

[0032] The adsorber I and adsorber II used in the present invention are plate-fin heat exchangers with the same size and structure, and the fin units composed of fins and partitions are stacked and fixed inside, and one side of the fins is tightly packed. Solid adsorbent, the other side is the heat exchange fluid.

[0033] Select the liquid phase mixture of 51% (mass fraction) n-butane, 46% (mass fraction) isobutane and 3% (mass fraction) propane as refrigerant, coconut shell activated carbon is adsorbent, plate-fin heat exchanger is For the adsorber, the adsorption temperature is 30°C, the desorption temperature is 120°C, the evaporation pressure is 0.16MPa (corresponding to the saturation temperature of 5°C), the ambient temperature is 30°C, the condensation pressure is 0.36MPa, the desorption and adsorption processes are both 8min, and the return The heating time is 2 minutes, the mass recovery time is 1 minute, the cooling power of the system is 130W / kg, and the COP is 0.1...

Embodiment 2

[0042] The adsorber I and adsorber II used in the present invention are tube-fin heat exchangers with the same size and structure. The finned tubes composed of fins connected to the heat exchange tubes are arranged and fixed inside, and the solid adsorbent is tightly packed. The fin side is filled, and the heat exchange fluid is inside the heat exchange tube.

[0043] The liquid phase mixture of 90% (mass fraction) isobutane, 2% (mass fraction) ethane and 8% (mass fraction) propylene is refrigerant, 90% (mass fraction) apricot shell activated carbon and 10% (mass fraction) The ZSM-5 molecular sieve mixture with a silicon-aluminum ratio of 15 is the adsorbent, the tube-fin heat exchanger is the adsorber, the adsorption temperature is 45°C, the desorption temperature is 110°C, and the evaporation pressure is 0.29MPa (corresponding to the saturation temperature of 0°C) , the ambient temperature is 40°C, the condensation pressure is 0.77MPa, the desorption and adsorption processes...

Embodiment 3

[0045] The adsorber I and the adsorber II adopted in the present invention are plate-fin heat exchangers with the same size and structure.

[0046] The liquid phase mixture of 40% (mass fraction) isobutane and 60% (mass fraction) n-butane is refrigerant, 85% (mass fraction) super activated carbon, 10% (mass fraction) pure silicon molecular sieve Silicalite-1 and 5 % (mass fraction) of the hydrophobic silica gel mixture is the adsorbent, the plate-fin heat exchanger is the adsorber, the adsorption temperature is 30°C, the desorption temperature is 115°C, and the evaporation pressure is 0.10MPa (corresponding to the saturation temperature is -5°C), The ambient temperature is 35°C, the condensation pressure is 0.36MPa, the desorption and adsorption processes are both 8 minutes, the heat recovery time is 2 minutes, the mass recovery time is 1 minute, the system refrigeration power is 88W / kg, and the COP is 0.13.

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Abstract

The invention discloses a micro-pressure operating adsorption refrigerating system. An alkyl or amino working medium is taken as a refrigerant for the adsorption refrigerating system, so the adsorption refrigerating system works in the micro-pressure environment in the pressure range between 0.10 and 1.00MPa (absolute pressure), the load and manufacturing cost of equipment are reduced, and the stability of the adsorption refrigerating system for long-term work is improved; a fin tube type, plate-fin or heat pipe heat exchanger is adopted as an adsorption heat exchanger to improve the heat exchange efficiency and shorten the cycle period of the system; and the system adopts heat return and mass return circulation, and has high energy utilization rate and high refrigerating efficiency. The adsorption refrigerating system is in micro-pressure operation, has low requirement on the equipment of the refrigerating system, can be driven by low-temperature heat and can stably and reliably operate.

Description

technical field [0001] The invention relates to an adsorption refrigeration system, which is especially suitable for thermal energy driving and has an operating pressure range of 0.10-1.00 MPa (absolute pressure), and belongs to the technical field of refrigeration. Background technique [0002] Adsorption refrigeration technology has two major advantages of energy saving and environmental protection, and has received common attention in the fields of refrigeration, new energy and environmental protection. At present, the adsorption refrigeration system using ammonia, water, methanol or ethanol as the refrigerant has high requirements for equipment manufacturing and the system operation stability is not high: the system using ammonia as the refrigerant has high operating pressure and heavy equipment load; When water, methanol or ethanol is used as the refrigerant, the system needs to be operated under high vacuum conditions. The problem of metal sealing is difficult to solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B15/16
CPCY02B30/62Y02A30/27
Inventor 崔群陈海军郑凯王海燕
Owner NANJING UNIV OF TECH
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