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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn Repeat Examinations 2010
Module Title: Building Services Processes CA
Module Code: MECH 6002
School: Mechanical & Process Engineering
Programme Title: Bachelor of Engineering in Building Services Engineering
Programme Code: EBSEN_7_Y1 ESENT_8_Y
External Examiner(s): Mr. Paul O Sullivan, Dr. Ben Costelloe Internal Examiner(s): Mr. Fergus Delaney, Mr. Brian Quinn, Mr. David Lynch
Instructions: Attempt one question from Section A, one question from Section B,
one question from Section C and one other question from any section
(4 questions to be attempted). Use separate answer books for each
section.
Duration: 2 Hours
Sitting: Autumn Repeat
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
Section A
Q1(a) Draw a primary circuit schematic for a boiler plantroom system consisting of the following medium pressure heating water (MPHW) system:
A primary circuit with two boilers in parallel, a primary circulating pump, a common flow and return header.Your schematic must include all the appropriate vales for isolation, the safe operation and commissioning of the system. (6 marks)
Q1 (b) Draw a schematic of a typical valving arrangement required on a common flow and return header for an MPHW system consisting of the following secondary circuits:
Two number secondary radiator circuits controlled by compensated heating. One number hot water calorifier. One number air handling unit (AHU) circuit with constant temperature variable flow through the AHU coils. Your schematic must include all the appropriate vales for isolation, the safe operation and commissioning of the system. (10 marks)
Q1 (c) Draw a schematic for a pressurisation unit suitable for an MPHW system. (4 marks)
Q2 You are required to estimate the size of a boiler plantroom at the preliminary design stage of a project. The plantroom will house two number 900 kW boilers measuring 2000mm long, 1050mm wide, 1550 mm high (each) and a 4000 litre hot water storage calorifier. All heating circuits and calorifier circuits are fed from a common flow and return header. Based on this limited information and the attached extracts from TN 9/92 “Space and Weight Allowances for Building Services Plant” complete the following:
a) Sketch the floor plan of a boiler plantroom and clearly dimension the space requirements for the boilers and ANY other space requirements for ANY other equipment you consider necessary for a low pressure heating water (LPHW) system. Clearly dimension the overall length and width of the boiler plantroom. Clearly state all assumptions made. (12 marks)
b) Produce a table (as shown below) clearly identifying the source of every dimension you use e.g”.TN 9/92 Table page 2” or “Dimension based on typical space allowance observed on site visit to …. “
Dimension (mm) Description Source 750 Side clearance for calorifier TN 9/92 Figure 8 page 8
(8 marks)
Section C
Q5 (a) Briefly explain the following wet systems of central heating and give one advantage and one disadvantage of each system:
(i) The one-pipe system (ii) The two-pipe system (iii) The two-pipe reverse return system (10 Marks)
(b) A domestic central heating system is to be zoned into three circuits, upstairs (sleeping), downstairs (living) and domestic hot water. Describe with the aid of a sketch the type of system most suited to this situation including the necessary controls required to operate the installation? (10 Marks)
Q6 (a) There are two distinct types of „cold water supply systems‟. Briefly describe both and list the advantages of each. (10 Marks)
(b) Briefly explain the following terms in relation to „hot water supply systems‟:
(i) Dead leg (ii) Secondary circulation (5 Marks)
(c) In relation to „hot water supply systems‟, briefly explain the health risk associated with storing hot water in a vessel (cylinder) at temperatures below 60oC? (5 Marks)
