A feasibility analysis of replacing the standard ammonia refrigeration device with the cascade NH3/CO2 refrigeration device in the food industry
| Autor: | Dennis Jankovich, Krešimir Osman |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
lcsh:Mechanical engineering and machinery
Thermodynamics Ton of refrigeration ammonia natural refrigerants law.invention mean temperature of the heat exchanger ammonia device refrigeration load refrigeration factor law Heat exchanger cascade device evaporating temperature condensing temperature lcsh:TJ1-1570 Process engineering reactive power Renewable Energy Sustainability and the Environment business.industry Heat pump and refrigeration cycle carbon dioxide Refrigeration Subcooling Cascade ammonia refrigeration device cascade NH3/CO2 refrigeration device total refrigeration factor ɛ total refrigeration load Q0 LC total reactive power P heat exchanger mean temperature Tm condensing temperature of the low temperature part Tc Absorption refrigerator Environmental science Vapor-compression refrigeration business |
| Zdroj: | Thermal Science, Vol 19, Iss 5, Pp 1821-1833 (2015) |
| ISSN: | 2334-7163 0354-9836 |
| DOI: | 10.2298/tsci130611097j |
| Popis: | The thermodynamic analysis demonstrates the feasibility of replacing the standard ammonia refrigeration device with the cascade NH3/CO2 refrigeration device in the food industry. The main reason for replacement is to reduce the total amount of ammonia in spaces like deep-freezing chambers, daily chambers, working rooms and technical passageways. An ammonia-contaminated area is hazardous to human health and the safety of food products. Therefore the preferred reduced amount of ammonia is accumulated in the Central Refrigeration Engine Room, where the cascade NH3/CO2 device is installed as well. Furthermore, the analysis discusses and compares two left Carnot¢s refrigeration cycles, one for the standard ammonia device and the other for the cascade NH3/CO2 device. Both cycles are processes with two-stage compression and two-stage throttling. The thermodynamic analysis demonstrates that the selected refrigeration cycle is the most cost-effective process because it provides the best numerical values for the total refrigeration factor with respect to the observed refrigeration cycle. The chief analyzed influential parameters of the cascade device are: total refrigeration load, total reactive power, mean temperature of the heat exchanger, evaporating and condensing temperature of the low-temperature part. |
| Databáze: | OpenAIRE |
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