| Autor: |
Бєляновська, О. А., Пустовой, Г. М., Сухий, К. М., Губинський, М. В., Сухий, М. П., Дорошенко, О. В., Сергієнко, Я. О. |
| Předmět: |
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| Zdroj: |
Refrigeration Engineering & Technology; 2019, Vol. 55 Issue 3, p165-171, 7p |
| Abstrakt: |
The key problems in the implementation of adsorptive solar regrigerators along with the properties of the adsorbents used are seasonal and daily irregularities of solar radiation, as well as the utilization of heat of adsorption. The purpose of the presented work is to determine the operational characteristics of adsorption refrigeration solar installations based on composite adsorbents "silica gel - sodium sulfate". The main structural elements of the adsorption refrigeration unit are the adsorber, on the front side of which is installed transparent insulation made of cellular polycarbonate plastic САН (thickness of 8 mm) with an integral transmittance of 0.88, and on the bottom a composite adsorbate is placed, condenser, evaporator, which is installed near the cold box. In the layer of adsorbent a hydraulic circuit on which water circulates is maintained. The heated water can be used to heat the adsorbent in the morning. Operation of the adsorption solar installation takes place in two stages. In the first stage, heat is removed from the cold box due to the evaporation of water in the evaporator. Water vapor diffuses to the adsorber, where it is adsorbed by the composite adsorbent. The second stage corresponds to the regeneration of the adsorbent (desorption). which is carried out by heating it by solar energy to the regeneration temperature. The operational characteristics of a solar adsorption refrigerator based on composites 'silica-sodium sulphate' were studied. A method for determining performance were developed. It involves calculating the amount of heat that should be removed from the chilling chamber, as a sum of the amount of heat removed from the chilling chamber design elements and products introduced into it, as well as compensating heat influx into the chamber, which allows determining the mass of water in the evaporator and the mass of the adsorbent, the heat inputs for the regeneration of the adsorbent, as well as the area of the solar collector and solar net coefficient of performance. It has been stated that during the operation of the refrigeration unit from May to September, the value of the solar operating refrigeration coefficient is 0.25 - 0.34. A process flowsheet for the utilization of heat of adsorption is proposed. The possibility of heating water due to the heat of adsorption from 50 to 90 ° C is shown, the mass of water being equal to from 277 to 681 kg. It is shown that the obtained heat carrier can be used for warming the adsorbent 'silica gel - sodium sulphate' in the morning period. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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