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BEE Energy Textbook 2024 : Energy

9 pages, 67 questions, 0 questions with responses, 0 total responses,

Mihir Prajapati
Nirma University (NU), Ahmedabad

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Question bank for Energy Managers & Energy Auditors Ch ap te r 2 .8 : W as te H e at Re co ve ry Part-I: Obje ctive typ e qu e s tio n s an d an s w e rs 1. 2. Major advantage of waste heat recovery in industry is: a) reduction in pollution b) increase in efficiency c) both a & b d) none of the above Heat recovery equipm ent will be m ost effective when the tem perature of flue gas is: a) 250 oC 3. 5. 6. c) 40 0 oC d) 280 oC The waste gases com ing out from gas turbine exhausts are of the order of: a) 370 -540 4. b) 20 0 oC b) 450 70 0 c) 70 0 -80 0 d) 250 -440 Recuperator is used m ainly as a waste heat recovery system in a _ _ _ _ . a) boiler b) billet Reheating Furnace c) com pressor d) none of the above Recuperator will be m ore efficient if the flow path of hot and cold fluids is in: a) co-current m ode b) counter current m ode c) cross current m ode d) none of the above The m ajor lim itation of m etallic recuperator is ------a) lim itation of handling CO x, NOx etc. b) lim itation of reduced life for handling tem perature m ore than 10 0 0 oC c) m anufacturing difficulty of the required design d) none of the above 7. Ceram ic recuperators can withstand tem peratures up to: a) 60 0 oC 8. 9. b) 130 0 oC c) 170 0 oC d) 950 oC Air preheater is not used as a waste heat recovery system in a_ _ _ _ . a) boiler b) billet Reheating Furnace c) heat treatm ent furnace d) com pressor Typical waste gases tem perature from glass m elting furnace a) 10 0 0 -1550 oC b) 80 0 -950 oC 2.8 Waste Heat - revised (table format) c) 650 750 oC d) 760 -815 oC 58

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