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HVAC Systems
Scholar Year: 2020/2021 - 1S
| Code: |
EM31237 |
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Acronym: |
SC |
| Scientific Fields: |
Termodinâmica Aplicada |
Courses
| Acronym |
N. of students |
Study plan |
Curricular year |
ECTS |
Contact time |
Total Time |
| EM |
9 |
|
3º |
6,0 |
75 |
162,0 |
Teaching language
Portuguese
Intended learning outcomes (Knowledges, skills and competencies to be developed by the students)
To know the types of HVAC systems, analyze their characteristics and applications. To calculate the fundamental equipments of an installation and be able to choose the main HVAC equipment. To know the basics of maintenance, operation and commissioning of an instalation.
At the end of the course students should be able to:
- Select and justify a choice of an equipment or system for installation;
- Know how to operate the systems and equipment;
- Size the main equipments of a system.
Syllabus
1. Introduction
Classification and typology of HVAC systems. Different types of centralized systems and terminal systems. Project and its process.
2. Central production equipment
Chillers and other central production units. Parameters for selection and operation. Chillers with partial and total heat recovery. Refrigeration circuits of different types of chillers. Variation of the efficiency of chillers with the outside and water temperature. Compact HVAC units. Energy recovery and storage systems.
3. Air handling units and terminal equipment
Constructions and disposition of modules of air handling units. Main modules and features. Speed of air and pressure drop air handling modules. Roof-tops units. Direct expansion units, split and multisplit systems. Terminal units: convectors, fan-coils, chilled ceilings and induction units.
4. Topologies of networks and hydraulic balancing
Typical hydraulic networks for chilled water systems. Networks with direct and reverse return. Control valves. Interconnection of chillers to cooling towers and to air handling units. The equilibrium between the primary and secondary loop water flows. Association of chillers in serie and in parallel. Speeds of air and water in the networks. The interaction between the network, the pump and the chiller. Potential problems due to poor balance of a network.
5. Water systems, all air systems and refrigerant systems
Design of outdoor airflow for a new installation. Outdoor and indoor air quality. Method based on the ventilation rate and the method of quality of air. Sensory evaluation.
Simple systems and dual conduit. VAV systems. Systems with fan coils. Systems with two and four pipes. VRV system.
Emergent systems: chilled ceilings and induction units
6. Methods for helping defining a system
Weighting of attributes and weighting functions. A brief introduction to the Value Analysis.
Demonstration of the syllabus coherence with the UC intended learning outcomes
Theorectical/ pratical (TP) lesson beeing expository with the students participation. In some TP lessons students willl discuss papers and real problems in instalations. In the laboratory classes the work will be classified in follow-up work, introduction to the reports and conduct thes laboratory tests and reports.
Demonstration of the teaching methodologies coherence with the curricular unit's intended learning outcomes
Periodic presentations and discussion of the subject (in group):Five presentations / discussions
Laboratory works.
Assessment methodologies and evidences
Test (max 50%), final minimum scores 9.5 values
Periodic presentations and discussion of the subject (in group) (max. 30%, minimum grade of average, 9.5 points):
- Five presentations / discussions
Laboratory tests (2 papers), (max 20%, minimum grade of 9,5):
- Chiller Essay (in group)
- UTAN test (individual)
Final Score: weighted average of the various components
Oral for scores greater than 17 values.
Attendance system
Non existant.
Assement and Attendance registers
| Description |
Type |
Time (hours) |
End Date |
| Attendance (estimated) |
Classes |
0 |
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Total: |
0 |
Observations
References:
W.P. Jones, Air Conditionning Applications and Design – Edward Arnold
Luís Roriz, Climatização, Concepção, instalação e condução de sistemas, Edições Orion, 2006
ASHRAE HandBook, Systems and Equipments, 2012
Normas: EN 13779, EN 779 e ASHRAE 62.1
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