Building Services Engineering Exam: Heating, Refrigeration, Health & Safety, Pumps, Exams of Materials science

Download Building Services Engineering Exam: Heating, Refrigeration, Health & Safety, Pumps and more Exams Materials science in PDF only on Docsity! Cork Institute of Technology Bachelor of Engineering in Building Services Engineering – Stage 1 (NFQ Level 7) Summer 2007 Building Services and Equipment (Time: 3 Hours) Answer THREE questions from Section A and ONE question from Section B and ONE question from Section C. Separate answer books must be used for each section. Examiners: Dr. Mervyn Smyth Mr. Declan Leonard Mr. F. Delaney Mr. J. Walsh Mr. D. Lynch Section A Q1 Heating Systems a) What are the relative percentages of heat loss by evaporation, convection and evaporation from the human body? (3 marks) b) Draw a simple sketch showing the heat transfer mechanisms that take place between the human body and the working environment. (4 marks) c) Briefly explain the classifications that are commonly applied to heating systems. (4 marks) d) Describe the main operating principles of radiant heating. (5 marks) e) Draw a neat labelled sketch of a gas fired radiant tube. (4 marks) Q2 Refrigeration Systems 2 a) Draw a schematic of the vapour compression refrigeration cycle. (5 marks) b) Explain the operation of the vapour compression refrigeration cycle. (6 marks) c) List 4 properties of a refrigerant. (4 marks) d) Draw a schematic of a split D-X unit. (5 marks) Q3 Health & Safety a) State three duties of an employer. (3 marks) b) State three duties of an employee. (3 marks) c) List five steps for controlling safety on a day to day basis. (3 marks) d) What is a Safety Statement? (2 marks) e) State three aims of a Safety Statement. (3 marks) f) What is meant by the term “SPA”? (2 marks) g) What information should be included in an SPA? (4 marks) Q4 Pumps A piping system has a design volumetric flow rate of 0.7 m3/s at 7.25 kPa. The pump that is installed in the system has performance data as listed in Table 2.1. (a) Draw the pump curve on the graph paper supplied. (8 marks) (b) Draw the system curve on the same graph as the pump curve. (Use the expression P=kQ2 and the design data to get a series of data points for the system curve) (10 marks) (c) Using the graphs state the volumetric flow rate and pressure loss at the operating point. (2 marks) Pump Data Q (m3/s) 0.0 0.20 0.40 0.60 0.80 1.0 1.2 P (kPa) 12 12 11 8.5 6 4 2.0