Air-conditioning Fundamentals

• Thermal Power Engineering, Semester 2, position 3

Getting knowledge in Air Conditioning - thermal comfort, heat gain and cooling load, air handling unit and its elements, mastering methods for calculating cooling loads for non-stationary conditions of heat transfer and using those methods in air conditioning project design.

Upon successful completion of the course, students should be able to: • Understand influence of indoor thermal conditions on human thermal comfort • Identified the process of unsteady heat transfer through the building envelope and inside air conditioned space • Perform cooling load calculation for air conditioned buildings • Select the appropriate amount of air for airconditioning system • Carry out the selection of air handling unit elements heaters, coolers, humidifiers) • Compare the characteristics of different systems for air filtration

Defining air conditioning; thermal ambiance conditions; thermal comfort in closed spaces; thermal regulation; meteorology and climate; Solar constant; atmosphere clearance; radiation on horizontal and vertical surfaces; outside and inside heat sources; heat transfer through single-layer and multiple-layer walls in non-stationary conditions of heat transfer; heat gains from solar radiation through window; heat storage factors; protection from solar radiation; shading effect on cooling load; heat gains from internal sources; calculation air flow rate for air conditioning; air treatment in air handling unit; air handling unit and its elements; heating and cooling coil; heat output control of heating and cooling coil; spraying chamber; evaporator; filtration; filter efficiency.

Auditory part consists of more sections: basic and complex processes in Molier h-x diagram, calculating cooling load from inside and outside heat sources, calculating airflow rate for air conditioning, defining air parameters in summer and winter operating mode, in order to independently complete project assignment. Laboratory exercise is demonstrative - air handling unit and its elements, air conditioning accessoris. Visit to Technical fair or factory for air conditioning equipment is planned.

In order to attend this subject, it is needed to pass exams: Thermodynamic M and Fluid mechanics M.

M. Todorovic, A. Sretenovic: Handouts B.Todorovic: Air conditioning, SMEITS, Belgrade, 2009.

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 10
Laboratory exercises: 5
Calculation tasks: 0
Seminar paper: 0
Project: 15
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 0
Review and grading of seminar papers: 0
Review and grading of the project: 5
Test: 5
Test: 0
Final exam: 5

Activity during lectures: 0
Test/test: 30
Laboratory practice: 0
Calculation tasks: 0
Seminar paper: 0
Project: 20
Final exam: 50
Requirement for taking the exam (required number of points): 21

ASHRAE Handbook of Fundamentals, Atlanta, Georgia, 2009; Recknagel, Sprenger, Schramek, Čeperković: Heating and Air-conditioning, Interklima, Vrnjačka Banja, 2002; Б. Тодоровић: Климатизација, Савез машинских и електротехничких инжењера и техничара Србије, Београд, 2009.