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Chapter 4.9 - HVAC Systems

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Selected questions Chapter 4.9: HVAC System Short type questions 1. Define tons of refrigeration ? Ans. 2. Where is performance evaluation of air conditioning unit term energy efficiency ratio (EER) is used? Ans 3. One ton of refrigeration is the amount of cooling obtained by one ton of ice melting in one day. It is equivalent to 3024 kcal/h, 12,000 Btu/h or 3.516 thermal kW. Energy Efficiency Ratio mainly used in air condition systems. Performance of smaller units and roof top units are frequently measured in EER rather than kW/ton. To assess the refrigeration capacity, list the basic parameters required? Ans For assessment of refrigeration load, basic parameters required are: a) Water flow rate through evaporator b) Temperature difference between entering and leaving water 4. Write the relation between COP, EER and kW/tonne, which are the different energy efficiency performance indicators of Refrigeration systems? Ans The relation between different energy efficiency performances of chillers are: COP kW/ton Refrigeration is defined as an art of producing and maintaining the temperature in a space below atmospheric temperature. Which is the popular low energy cost comfort cooling system in tropical climate (dry regions)? Ans 7. - 3.516/CoP Define the term refrigeration ? Ans 6. - 12/EER kW/ton 5. - 0.293 EER Evaporative cooling systems are popular in tropical climate. These systems control humidity up to 50% for human comfort. Find the dew point temperature ( C) of air for following parameters from psychrometric chart? Ans Dry bulb temp ( C) = 25 C, Wet bulb temperature ( C) = 16 C Dew point temperature of above air is 10.0 8. How cooling tower should be designed for refrigeration systems? Ans 9. Cooling water inlet temperature to refrigeration system should be as low as possible. In general, cooling towers will be design with approach WBT + 3 C for refrigeration systems. What will be the additional refrigeration (TR) required, if a coffee machine of 3 kWh consumption, added in conditioned space? Ans Additional heat inside the space = 3 x 860 = 2580 kcal/h Equivalent refrigeration load (TR) = 2580/3024 = 0.85 TR 10. Write the coefficient of performance (CoP) for an ideal refrigeration system (Carnot cycle) ? Ans COP Carnot = Te/Tc-Te Te=Evaporator temperature; Tc- condenser temperature 4.9 - HVAC system (table format) 54

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