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Acclimatization and Refrugeration

Code:

LEM21119

Sigla:

CR

Áreas Científicas
Classificação	Área Científica
OFICIAL	Applied Thermodynamics

Ocorrência: 2021/2022 - 1S

Ativa?	Yes
Unidade Responsável:	Departamento de Engenharia Mecânica
Curso/CE Responsável:

Ciclos de Estudo/Cursos

Sigla	Nº de Estudantes	Plano de Estudos	Anos Curriculares	Créditos UCN	Créditos ECTS	Horas de Contacto	Horas Totais
EM	6	Plano de Estudos	2	-	6	75	162

Língua de trabalho

Portuguese
Obs.: Português

Objetivos

Provide the basic concepts and encourage a taste for the study of HVAC and Refrigeration.

Provide students with basic knowledge of psychrometrics and know how to apply this knowledge to the most common climate control situations.

Provide the student with the theoretical and practical concepts necessary to study the various types of refrigeration machines, as well as carry out their dimensioning.

Resultados de aprendizagem e competências

Know how to calculate, size and interpret HVAC and refrigeration systems and equipment.

Modo de trabalho

Presencial

Pré-requisitos (conhecimentos prévios) e co-requisitos (conhecimentos simultâneos)

Sustained knowledge of thermodynamics, fluid mechanics and heat and mass transmission.

Programa

Chap.1 - Thermodynamics Revisions. Reviews of the main concepts of thermodynamics. Thermodynamic properties. 1st law of thermodynamics aplyed to closed and open systems. Massic and energetic balances. 

Chap.2 – Psychometry. Mixture of air and water vapor. Moist air. Wet air properties, wet and dry bulb temperature, relative humidity and specific humidity, enthalpy and specific volume. 

Chap.3 - Psychometric Evolutions. Cooling, heating, mixing, humidifying, dehumidifying, adiabatic and non-adiabatic humidification. Evolutions in the psychrometric diagram. Thermodynamic balances for each evolution. Sensitive heat and latent heat, sensitive heat factor, room and installation line marking. Typical summer evolution, typical winter evolution. Project conditions. 

Chap.4 – One-story, two-story and waterfall refrigeration cycles. Theoretical and real cycles for refrigeration production, Mollier diagram (T-s, P-h), characteristic parameters of the cycle, refrigerating efficiency and COP, isentropic compressor efficiency, refrigerating effect and refrigerating power, compression power.

Cap.5 – Refrigerating equipment. Types of compressors, their classification and operating principles. Condensers, Evaporators and Expansion Devices. Auxiliary and safety equipment. Control equipment. Cooling fluids. 

Chap.6 - Perishable products. Characteristics, refrigeration, freezing and conservation. Constitution of food. Operating temperatures. Storage conditions. Cold rooms and Cooling Tunnels.

Bibliografia Obrigatória

W.P. Jones,; Air Conditioning Engineering", Edward Arnold
P. Koelet; Industrial Refrigeration – Principles, Design and Applications, The MacMillan Press

Métodos de ensino e atividades de aprendizagem

Exposition in the classroom through theoretical-practical and laboratory classes.

Tipo de avaliação

Distributed evaluation without final exam

Componentes de Avaliação

Designation	Peso (%)
Teste	70,00
Trabalho laboratorial	30,00
Total:	100,00

Componentes de Ocupação

Designation	Tempo (Horas)
Estudo autónomo	20,00
Frequência das aulas	50,00
Trabalho laboratorial	30,00
Total:	100,00

Obtenção de frequência

Continuous assessment (to be carried out during the term):

- Two tests (70%) - Minimum score for each test 9.0V (with the possibility of recovery); Minimum arithmetic mean: 9.5V

- Laboratory work (30%) - Mandatory

- If the student does not obtain the minimum grade in one of the tests, he/she can recover on the date of the recovery test.

* Recovery of one or both tests (to be carried out after the academic period on the two dates defined by the Pedagogical Council):

Fórmula de cálculo da classificação final

FINAL GRADE = 0.35 NT1 + 0.35 NT2 + 0.3 NL

NT1 - 1st test grade
NT2 - 2nd test score
NL - laboratory component grade