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Chapter 3.4 - HVAC and Refrigeration System

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bee_energy
Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Question bank for Energy Managers & Energy Auditors Chapter 3.4: HVAC & Refrigeration System Part I: Objective type questions and answers 1. One ton of refrigeration (TR) is equal to ____. a) 3024 Kcal/h 2. b) 3.51 kW b) Thermal energy b) High heat output d) All d) always 2.5 Match the following in respect of typical specific energy consumption (kW per TR) of refrigeration compressors. kW/TR a) Reciprocating i) 0.63 kW/TR b) Centrifugal ii) 0.65 kW/TR c) Screw iii) 0.7 0.9 kW/TR Ans. a-iii; b-i; c-ii The essential parameters to estimate cooling load from air side across air handling unit (AHU) / Fan Coil Unit (FCU) are_______. a) Flow rate 7. c) High emissions c) above 1.1 b) less than 1.1 Refrigeration Compressor 6. b) dry bulb temperature c) RH% or wet bulb temperature b) wet bulb temperature c) dew-point temperature d) any of the above Centrifugal compressors are most efficient when they are operating at_____. a) 50% load 9. b) Full load c) 75% Load d) All load conditions In general, designed chilled water temperature drop across the chillers is____ C. a) 5 C 10. b) 1 C c) 10 C d) 15 C Higher COP can be achieved with_____. a) Lower evaporator temperature and higher condenser temperature b) Higher evaporator temperature and Lower condenser temperature c) Higher evaporator temperature and higher condenser temperature d) 11. d) all In water cooled refrigeration systems, condenser cooling water temperature should be close to: a) dry bulb temperature 8. d) All COP of absorption refrigeration systems a) Between 4-5 5. c) Electrical energy The main disadvantage of use of HFCs and HCFCs compared to use of CFCs is_____ a) Low Efficiency 4. d) all The driving force for refrigeration in vapour absorption refrigeration plants is____ a) Mechanical energy 3. c) 120oo BTU/h Lower evaporator temperature and Lower condenser temperature The required A/C size for comfort conditions for general living room (12 ft x 12 ft) at residence is_____. a) < 0.5 TR b) 1 to 1.5 TR 3.4 HVAC - revised (table format) c) > 2.5 TR d) any of the above 25

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