Projeto de uma unidade frigorífica para congelamento e armazenamento de peixes, ciclo de refrigeração por compressão de vapor com expansão direta de R404A

Abstract

The work was developed to apply the theoretical knowledge of mechanical engineering for dimensioning a fishing fridge unit. Therefore, condensing units, evaporators and other accessories were properly chosen to reach a demand for two freezing tunnels and a cold storage chamber for tilapia fillets. The refrigerant fluid R404A was chosen because it is an HCF, which does not degrade the ozone layer. The fictitious enterprise was dimensioned for a specific location in the city of Uberlândia - Minas Gerais - Brazil. The rotation capacity of the beneficiation system and the activity aims to maintain the fish rotativity around 2000 kg per day for storage and 135 kg per hour in each freezing tunnel. Other important data within this cold chain were, for example, the tilapia fillets arriving at the place with a temperature lower than or equal to their freezing temperature (-2ºC) then they will pass through the freezing tunnels, leaving with an approximate temperature of –25ºC. Following the beneficiation process, the product will be grouped into cardboard packages, transported and stored in the cold storage chamber, which will be at a temperature of -20ºC. The methodology was properly designed to calculate the thermal load, involving heat transfer estimates, as well as an actual data from the main technical standards applied in the sector. The results section provides a detailed view, through layouts, of the processes organized within the fridge, as well as the sizing of the main equipment that integrate the entrepreneurship.