
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

Chapter 4.4 - Heat Exchangers

7 pages, 23 questions, 0 questions with responses, 0 total responses,

bee_energy
Jawaharlal Nehru Technological University (JNTUH), Hyderabad

+Fave Message

Profile Timeline Uploads Q & A

Home > bee_energy >

Formatting page ...

Selected questions Chapter 4.4: Heat Exchangers Short type Questions 1. Define effectiveness of heat exchanger? Ans. Effectiveness = to ti (T i ti ) = Cold fluid temp. range Inlet temp. diff . of hot & cold fluid Where, to Cold fluid outlet temperature ti = Cold fluid inlet temperature Ti 2. = = Hot fluid inlet temperature What do you mean by heat duty of a heat exchanger? Ans. 3. Heat duty of a heat exchanger is defined as the heat that is transferred from hot fluid to cold fluid per unit time. Mention 2 basic parameters that have to be measured at site to evaluate the performance of a heat exchanger? Ans. Hot and cold fluid in let and outlet temperatures 2. 4. 1. Mass flow rate of cold and hot fluids What do you mean by capacity ratio in a heat exchanger? Ans. R= Ti To Temp. range of hot fluid = t o t i Temp. range of Cold fluid Where, to Cold fluid outlet temperature ti = Cold fluid inlet temperature Ti = Hot fluid inlet temperature To 5. = = Hot fluid outlet temperature Find the Overall heat transfer coefficient for a shell and tube counter flow heat exchanger where the heat exchanged is 11.27 GJ/hour with the heat transfer area of 96 m2. Assume the LMTD as 76 oC. Ans. Heat Transfer Co-efficient Overall HTC, U = Q/ (A x LMTD) = 11.27 x 106 / (3600 x 96 x 76) = 0.43 kW/m2. K 6. Give the equation to calculate the Overall heat transfer coefficient. Ans. Heat exchanger performance is normally evaluated by the overall heat transfer coefficient U that is defined by the equation U=Q/ (A x LMTD) Where Q = Heat transferred in kCal/hr A = Heat transfer surface area in m2 LMTD = Log Mean Temperature Difference in 0C U = Overall heat transfer Coefficient kCal/hr/m2/0C 4.4 - Heat exchangers (table format) 22

Formatting page ...

Tags : Bureau of Energy Efficiency, BEE, National Productivity Council of India, NPC, Energy Audit, Certified Energy Manager, Certified Energy Auditor, EM & EA, bee papers, bee sample papers, bee books, portal for bee india, bee question bank, bee question papers with answers, bee model test papers, solved board question papers of last year, previous years solved question papers, free online solved question paper, india sample questions papers, last 10 years papers, guess sample questions papers, important questions, specimen / mock papers, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005.

bee_energy chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: