CHAPTER 5 Energy Efficient HVAC Design

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Energy Efficient HVAC Design

CHAPTER

Guidelines

Proposed Mandatory Clause

Technical Guidelines

5 Energy Efficient HVAC Design

5.1 Guideline

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Development of Building Regulations and Guidelines to Achieve Energy Efficiency in Bangalore City

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Energy Efficient HVAC Design

Guidelines

Proposed Mandatory Clause

Technical Guidelines

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Development of Building Regulations and Guidelines to Achieve Energy Efficiency in Bangalore City

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Energy Efficient HVAC Design

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Technical Guidelines

5.3.1 Guidelines on optimization of cooling load estimation

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Table 5.3.1: Inside design conditions for air-conditioned spaces in the Bangalore city S. No.

Category

Inside design conditions

(I)

Restaurants

DB 23 to 26 C

(ii)

Office buildings

DB 23 to 26 C RH 55 to 60%

(iii)

Radio and television studios

DB 23 to 26 C

RH 55 to 60%

RH 45 to 55% (iv)

Departmental stores

DB 23 to 26 C RH 50 to 60%

(v)

Hotel guest rooms

DB 23 to 26 C RH 50 to 60%

(vi)

Classroom

DB 23 to 26 C RH 50 to 60%

(vii)

Auditoriums

DB 23 to 26 C RH 50 to 60%

(viii)

Recovery rooms

DB 24 to 26 C RH 45 to 55 %

(ix)

Patient rooms

DB 24 to 26 C RH 45 to 55 %

(x)

Operation theatres

DB 17 to 27 C RH 45 to 55 %

(xi)

Museums and libraries

DB 20 to 22 C RH 40 to 55 %

(xii)

Telephone terminal rooms

DB 22 to 26 C RH 40 to 50 %

1DB: Dry bulb temperature, RH: Relative humidity

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Energy Efficient HVAC Design

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Technical Guidelines

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Table 5.3.2: Recommended outdoor design conditions for the Bangalore city for cooling load estimation Cooling DB/MCWB 0.4 %

1.0 %

MCW B DB

DB

Cooling WB/MCDB

34.7 19.6

2.0 %

MCWB DB

34

19.6

0.4 %

MCWB

33.1

19.2

1.0 %

2.0 %

WB MCDB WB MCDB

WB

MCDB

23.5

22.5

27.7

28.9 22.9 28.2

1DB: Dry bulb temperature, MCWB: Mean coincidental wet bulb temperature, WB: Wet bulb temperature, MCDB: Mean coincidental dry bulb temperature

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Outside Air Damper

Energy recovery wheel

Supply Air

Outdoor Air

Return Air Air Exhaust Air

EA and OA Filters

Table 5.3.3: Minimum ventilation rates in the breathing zone (This table is not valid in isolation; it must be used in conjunction with the accompanying notes) Occupancy category

Office Buildings Office space Reception areas Telephone/data entry Main entry lobbies

People Outdoor Air Rate RP

Area Outdoor Air Rate Ra

cfm/person

L/s person

cfm/ft2

L/s m2

5 5

2.5 2.5

0.06 0.06

0.3 0.3

5

2.5

0.06

5

2.5

0.06

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Occupant Density (see Note 4) #/1000 ft2 or #/100 m2

Combined Outdoor Air Rate (see Note 5)

Air Class

Cfm/person

L/s person

5 30

17 7

8.5 3.5

1 1

0.3

60

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5.2.2 Guidelines on AHU specifications to achieve energy efficiency 6 '

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Table5.3.4: Values of performance characteristics of two-pole and four-pole energy-efficient induction motors Rated output

Two-pole motor nominal efficiency

Four-pole motor nominal efficiency

(kW)

for eff 1

for eff 1

(%)

(%)

0.37

70.2

73

0.55

74

78

0.75

77

82.5

1.1

82.8

83.8

1.5

84.1

85

2.2

85.6

86.4

3.7

87.5

88.3

5.5

88.6

89.2

7.5

89.5

90.1

9.3

90

90.5

11

90.5

91

15

91.3

91.8

18.5

91.8

92.2

22

92.2

92.6

30

92.9

93.2

37

93.3

93.6

45

93.7

93.9

55

94

94.2

75

94.6

94.7

90

95

95

110

95

95.2

Development of Building Regulations and Guidelines to Achieve Energy Efficiency in Bangalore City

Energy Efficient HVAC Design

Guidelines

Proposed Mandatory Clause

Technical Guidelines

Benefits

Rated output

Two-pole motor nominal efficiency

Four-pole motor nominal efficiency

(kW)

for eff 1

for eff 1

(%)

(%)

125

95.3

95.5

132

95.3

95.5

160

95.5

95.8

5.2.3 Guidelines for energy-efficient chillers −

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S. No.

Equipment class

Minimum COP 3.08

2

Unitary air cooled air conditioner 19 and