HKIS –PQSL (16 Nov 2015) · hkis –pqsl (16 nov 2015) sr. kenny lui bsc, llb, mmgt, macs mhkis, mrics, rps(qs), pfm basic understanding of mvac system and measurement

HKIS – PQSL (16 Nov 2015)Sr. Kenny LuiBSc, LLB, MMgt, MACSMHKIS, MRICS, RPS(QS), PFM

BASIC UNDERSTANDING OF MVAC SYSTEM AND MEASUREMENT

Prepared by: Kenny Lui 1

What are we going to cover tonight?

What is MVAC System?How to measure it from a QS perspective?

Disclaimer Note

This set of notes has been prepared according to the author’s own experience of therelevant practice and is intended for educational purpose and information only. Noresponsibility for loss occasioned to any person acting or refraining from actionoccasioned by or as a result of any material included will be accepted by the authoror its company.

The materials and information contained herein are not intended to offer or provideany technical advice concerning the topics covered. Please consult professionalengineers or your QS senior where necessary.

What is MVAC System?

MVAC

HVAC ACMV

What is MV?

MVA. Music VideoB. Mechanical Ventilation

What is AC?

ACA. Alternating CurrentB. Air Conditioning

What is MVAC System?

ACMV

8

MV System

9

MV SystemAxial Fans

10

MV SystemCentrifugal Fans

11

MVAC System

http://chemistry.bd.psu.edu/jircitano/gases.html

12

MVAC System

P T

P T

13

MVAC SystemWindow Type Air‐Conditioners Moveable Air‐Conditioners

14

MVAC SystemWall Air Conditioners Ceiling Mounted / Cassette Air‐Conditioners

15

Chillers Cooling towers

Air handling units

16

Fan Coil Units

Pipeworks to / from Fan Coil Units

17

Chilled water pipeworks Insulation

Protective Coverings and Finishings

18

Ductwork Insulation


19

MVAC System

Chiller AHU / FCU

CHWS

CHWR

Fresh Air Duct

Supply Air Duct

Return Air Duct

Air Grilles

Condensate DrainCondensate Drain

Electrical and Control

PAU

20

MVAC SystemWhat do you hear tonight

What do we not discuss / explore tonight

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MVAC SystemFurther Reading / Study

http://www.airintelligence.co.uk/wp‐content/uploads/2012/10/cooling‐cooling.jpg

http://ac2015.net/posts/air‐conditioner‐working‐principle/

https://www.youtube.com/watch?v=_lFUlA1PZ8U

How to measure it from a QS perspective?

23

Preparation for Measurement

Drawings

Specifications / Codes of Practices

Standard Method of

MeasurementPreambles

Sample Bills

24


DrawingsSpecifications / Codes of PracticesStandard Method of MeasurementPreamblesSample Bills, if any

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DrawingsLegend, Notes & Abbreviations

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27

DrawingsLayout

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DrawingsLayout

Fresh Air Louvre –Builder’s Trade

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DrawingsLayout

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DrawingsLayout

31

At Roof Level

At 1/F

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DrawingsEquipment Schedule

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DrawingsEquipment Schedule

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DrawingsSchematic (Water side)

Plant RoomArea

Non‐Plant Room Area

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DrawingsSchematic (Water side)

36

DrawingsSchematic (Air side)Mech. Vent.

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DrawingsSchematic (Air side)A/C

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DrawingsMVAC Provision Zoning

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DrawingsTypical Details

40

DrawingsCable Schedules

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DrawingsElectrical Schematic

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DrawingsControl Schematic

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Schematic (Air side) A/CSchematic (Air side) Mechanical Ventilation

Typical DetailsElectrical and Control

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45

Specification / Code of Practice

46

Specification / Code of Practice

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48

HKSMM 4

Always modified by Preamble

49

HKSMM 4INFORMATION PROVIDED MEASUREMENT RULES DEFINITION RULES COVERAGE RULES

SUPPLEMENTARY INFORMATION

Qty

Classification Table Supplementary Rules

50

HKSMM 4

51

HKSMM 4

52

HKSMM 4

53

HKSMM 4

54

HKSMM 4

55

HKSMM 4

56

HKSMM 4

57

HKSMM 4

58

HKSMM 4

A.

B.

C.

59

HKSMM 4

MEASUREMENT RULES

M.2 Pipework is measured over all inline fittings, short running lengths and branches, but not through items of ancillaries, headings and trapping sets.

M.3 Where an in‐line reduction in diameter occurs at a reducer or tee etc., the largest diameter shall be measured the full length of the fitting.

60

HKSMM 4

C.

61

HKSMM 4

DEFINITION RULES

D.2 Final supports are any element between the structure or the support structureand the pipe.D.3 The term pipework fittings isdeemed to include:(a) Bends, (b) Elbows, (c) Branches, (d) Reducers, (e) Tees,(f) Reducing bends, (g) Reducing tees, (h) Caps, (i) Flanges, and the like.

62

HKSMM 4

COVERAGE RULESC.2 Pipework is deemed to include:(a) Fittings for pipes

63

HKSMM 4In‐line fittings

Accessories

Ancillaries

64

HKSMM 4

65

HKSMM 4

66

HKSMM 4

67

HKSMM 4

MEASUREMENT RULES

M.2 Ductwork rectangular in section is measured over all in‐line fittings, short running lengths and branches, (but not through items of inline equipment).

M.3 Where an in‐line reduction in size (given by circumference/perimeter) occurs at a reducer or tee etc. the largest size shall be measured for the full length of the fitting.

68

HKSMM 4

COVERAGE RULES

C.2 Work is deemed to include all in‐line fittings

C.3 Work is deemed to include all cutting of ductwork to fittings, equipment and ancillaries, and providing all necessary materials, heat, bolts, nuts, washers and everything necessary for making joints and connections.

69

HKSMM 4

70

HKSMM 4

71



72

Preambles

73

Preambles

74

Preambles

75

Preambles

76

Preambles

77

Preambles

78

Preambles

79

Preambles

80

Preambles

81

Preambles

82


DrawingsSpecifications / Codes of PracticesStandard Method of MeasurementPreamblesSample Bills

83

Sample Bills

https://www.archsd.gov.hk/media/38193/Model_Bill_2012.pdf

84

Sample Bills


85

Sample Bills


86

Sample Bills


87

Sample Bills


Cross reference to drawings or specification

Type and duty stated

88

Sample Bills


89

Sample Bills


Type of material

Size, gauge or thickness and type stated

90

Sample Bills


91

Sample Bills


92

Sample Bills


93

Sample Bills


94

Sample Bills


95

Sample Bills


To be discussed in Electrical and Control Sections

96

Sample Bills


97

Sample Bills


98

Sample Bills


99

Sample Bills


100

Sample Bills


101

A ReminderEquipment

Pipework

Pipework in‐line fittings / ancillaries

Ductwork (rectangular)

Ductwork (circular / oval)

Ductwork in‐line fittings / ancillaries

nr

nr

nr

m

m

m2

102

A Reminder

103

Chilled water pipeworks Insulation

Protective Covering and Finishing

104

Chilled water pipeworks

What about: InsulationProtective Covering and Finishing

105

Chilled water pipeworks / Insulation / Protective Covering and Finishing

106

Chilled water pipeworks / Insulation / Protective Covering and Finishing

107

Ductwork Insulation


108

Ductwork / Insulation / Protective Covering and Finishing

Insulation to rectangular ductwork is measured the nett area in contact with the base of all ducting as installed and overall ducting fittings and joints

109

Ductwork / Insulation / Protective Covering and Finishing

Protective coverings and finishings to insulated rectangular ductwork is measured the nett area in contact with the base of all ducting as installed and overall ducting fittings and joints

Disclaimer Note

This set of notes has been prepared according to the author’s own experience of therelevant practice and is intended for educational purpose and information only. Noresponsibility for loss occasioned to any person acting or refraining from actionoccasioned by or as a result of any material included will be accepted by the authoror its company.

The materials and information contained herein are not intended to offer or provideany technical advice concerning the topics covered. Please consult professionalengineers / your QS senior where necessary.

Documents

HKIS –PQSL (16 Nov 2015) · hkis –pqsl (16 nov 2015) sr. kenny lui bsc, llb, mmgt, macs mhkis, mrics, rps(qs), pfm basic understanding of mvac system and measurement