Utilizing the new laboratory equipment in HVAC courses Principal lecturer, Ph.D. Marianna Luoma 18.5.2017

Contents of the presentation Qualifications of an HVAC engineer Names and contents of the courses The new air handling unit and its components Examples of laboratory assignments Comments from the Double Degree students

This is a shopping mall in the metropolitan area of Helsinki. Several shops, restaurants and other activies. Different activiesties require different heating ventilating and air conditioning systems. Indoor air requirements are somewhat challencing, because the amount of visitors vary during the day. The visitors might be using warm winter clothes and the employees in the shops and restaurants not. High satisfaction of all the users is required of course. Kesällä kuuma kaupoissa valaistuksen takia, veto ovien lähellä, The key technology in fullfilling these requirements is the HVAC technology and the HVAC engineer as an expert. The role of HVAC engineer is importantant in design phase of that kind of building, in the construction phase, and commissioning and during the use of the building as well. Out students start often at the age of ? And their only experience of shopping malls for example might be as visitors and they haven’t even thought about the building services systems. Thus, our task as lecturers are teach them. They should be able to work in the design later in their career.

Names of the HVAC courses for Double Degree students Semester Course Examples of contents Spring Indoor climate Basics of temperature and humidity Air flow rates Requirements and guidelines Measurement techniques Air conditiong Components of air conditioning systems Air handling processes (heating, cooling, humidification, dehumidification) and their calculation Autumn Commissioning of HVAC systems Laboratory measurements Design and dimensioning of HVAC systems Presentation of heating, ventilating and water and sewage systems in building HVAC design documents

Theoretical studies and basics in the classroom Orientation to the understanding of indoor climate and HVAC as a whole by: Lectures Calculation exercises Exams

The student gets hands-on experience of: Indoor climate and ventilation course The student gets hands-on experience of: Ventilation systems and components in Building A classrooms, offices and the machine room Measuring instruments and how to use them Measurement of indoor air temperature humidity velocity (draft) air quality Measurement of ventilation system air flow rates velocities pressure differences

Calculation of the thermal power  (kW) of the air or liquid flow Air conditioning course Calculation of the thermal power  (kW) of the air or liquid flow  = air volume flow, m3/s ρ = air density, 1,2 kg/m3 cp = specific heat capacity of air, 1 kJ/kgC ΔT = temperature difference, C

Become familiar with the air-handling unit and its main components Explain the symbols for air treatment and air distribution equipment.

Air handling unit … and a test room

Test room The air handling unit is used to create the desired conditions in the test room. These parameters can be controlled and measured: Air temperature Humidity CO2 concentration Supply and exhaust air flow rates

Building automation system Centralized control of building’s heating, ventilating and air conditioning systems Same type of system is used in many new office buildings etc. The building maintenance can use to monitor and control the operation of the HVAC system

Examples of laboratory assignments in April AIR-HANDLING UNIT Become familiar with the air-handling unit and its main components. Explain the symbols for air treatment and air distribution equipment in the drawing. Become familiar with the measurement of temperature, humidity, pressure difference, air velocity and air flow rates in the air-handling unit. Add the measured values of temperature, humidity, pressure difference, air velocity and air flow rates in the empty boxes in the drawing. LIQUID-COUPLED HEAT EXCHANGER Draw the heat recovery process on the Mollier chart. Calculate the thermal power  (kW) of the heat recovery equipment. Calculation for supply air Calculation for liquid Calculate the temperature efficiency η for heat recovery.

Building automation system

Drawing HVAC processes on the Mollier chart Heat recovery Heating Humifying Cooling Understanding, how the temperature and humidity as well as entalphy of the air are changing in each process.

Mollier chart Humidifying the air Heating of the air Outside air temperature and humidity

Air flow measurements IN the TEST ROOM 6 different instruments were used: GGA-65 + horn AM-300 TSI Airflow TA465P + TSI 995 wane anemometer + TSI 995 air cone Swema air 300 Nr2 + SwemaFlow 125 SWEMA 3000 manometer + caliber tool + hook SwemaFlow 233 TSI Accubalance

Comments from Double Degree students Air handling unit It helped to study about components like filters and silencers etc. It helped me to understand, how the information from the sensors can be used. It deepend my understanding about how air handling unit works and how much thermal power is needed to heat the air. Air flow rates in the test room A real opportunity to measure actual air flow rates. Now I understand how the air flow rates can be determined without calculations. I believe, I am now able to measure air flow rates on my own. I understand that there are several different measurement techniques to get the same air flow rate.