CHAPTER 5 Energy Efficient HVAC Design

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Cameron Owen
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1 CHAPTER 5 Energy 5.1 Guideline

2 5.2 Mandatory clause 5.3 Technical notes #$$% #$$% #$$& ( ) +, (./

3 5.3.1 on optimization of cooling load estimation %0 Table 5.3.1: Inside design conditions for airconditioned spaces in the Bangalore city S. No. Category Inside design conditions (I) Restaurants DB 23 to 26 C RH 55 to 60% (ii) Office buildings DB 23 to 26 C RH 55 to 60% (iii) Radio and television studios DB 23 to 26 C 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

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

4 %2# Table 5.3.2: Recommended outdoor design conditions for the Bangalore city for cooling load estimation Cooling DB/MCWB Cooling WB/MCDB 0.4 % 1.0 % 2.0 % 0.4 % 1.0 % 2.0 % DB MCW B DB MCWB DB MCWB WB MCDB WB MCDB WB MCDB DB: Dry bulb temperature, MCWB: Mean coincidental wet bulb temperature, WB: Wet bulb temperature, MCDB: Mean coincidental dry bulb temperature $30$#$4 2%550&%.( 04. $34 6 )7 8,89#0#$$&6 7

WB/MCDB 0.4 % 1.0 % 2.0 % 0.4 % 1.0 % 2.0 % DB MCW B DB MCWB DB MCWB WB MCDB WB MCDB WB MCDB 34.7 19.6 34 19.6 33.

5 %22 Outside Air Damper Energy recovery wheel Supply Air Outdoor Air Exhaust Air Return Air Air EA and OA Filters Table 5.3.3: Minimum ventilation rates in the breathing zone Occupancy category (This table is not valid in isolation; it must be used in conjunction with the accompanying notes) People Outdoor Air Rate RP cfm/person L/s person Area Outdoor Air Rate Ra cfm/ft 2 L/s m 2 Notes Occupant Density (see Note 4) #/1000 ft 2 or #/100 m 2 Combined Outdoor Air Rate (see Note 5) Cfm/person L/s person Air Class Office Buildings Office space Reception areas Telephone/data entry Main entry lobbies

Outdoor Air Rate RP cfm/person L/s person Area Outdoor Air Rate Ra cfm/ft 2 L/s m 2 Notes Occupant Density (see Note 4) #/1000 ft 2 or #/100 m 2 Combined Outdoor Air Rate (see

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7 %$$ #<, &=<# # on AHU specifications to achieve energy efficiency 6> < ) ) > ) )

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10 >. 96) 7 9%4 9 5$4 & 0%23# C3 80#90%+#$$3D D 6., 7 Table5.3.4: Values of performance characteristics of twopole and fourpole energyefficient induction motors Rated output Twopole motor nominal efficiency (kw) for eff 1 for eff 1 (%) (%) Fourpole motor nominal efficiency

Rated output Twopole motor nominal efficiency (kw) for eff 1 for eff 1 (%) (%) Fourpole motor nominal efficiency 0.37 70.2 73 0.

11 Rated output Twopole motor nominal efficiency (kw) for eff 1 for eff 1 (%) (%) Fourpole motor nominal efficiency for energyefficient chillers + = ( )$+,,. / + Minimum S. No. Equipment class Minimum COP Test standard IPLV Unitary air cooled air conditioner 19 and <40 kw ( ARI 210/240 1 and <11 tons ) 2 Unitary air cooled air conditioner 40 to <70 kw (11 to 3.08 ARI 340/360 3 Unitary air cooled air conditioner 70 kw (20 tons) ARI 340/360 4 Unitary water cooled air conditioner <19 kw (<5.4 tons) 4.1 ARI 210/240 5 Unitary water cooled air conditioner 19 and <40 kw ( ARI 210/240 6 and Unitary <11 water tons ) cooled air conditioner <40 kw (11 tons ) ARI 210/240 S. No. Equipment class Minimum COP Minimum IPLV Test standard 1 Air cooled chiller <530 kw (<150 tons) ARI 550/ Air cooled chiller 530 kw (150 tons) ARI 550/ Centrifugal water cooled chiller < 530 kw (<150 tons) ARI 550/

08 ARI 210/240 1 and <11 tons ) 2 Unitary air cooled air conditioner 40 to <70 kw (11 to 3.08 ARI 340/360 3 Unitary air cooled air conditioner 70 kw (20 tons) 2.93 2.

12 Minimum S. No. Equipment class Minimum COP Test standard IPLV Centrifugal water cooled chiller 530 and <1050 kw ( ARI 550/ and <300 tons) Centrifugal water cooled chiller 1050 kw ( 300 tons) ARI 550/ Reciprocating compressor, water cooled chiller all sizes ARI 550/ Rotary screw and scroll compressor, Water Cooled Chiller ARI 550/ (<150 <530 kw tons) 8 Rotary screw and scroll compressor, water cooled ARI 550/ Chiller 530 and <1050 kw (150 and <300 tons) 9 Rotary screw and scroll compressor, water cooled chiller 1050 kw ARI 550/ :7 0$ 9 : & 54 E #$$%

61 ARI 550/5901998 5 6 Reciprocating compressor, water cooled chiller all sizes 4.2 5.05 ARI 550/5901998 7 Rotary screw and scroll compressor, Water Cooled Chiller 4.

13 +, ) ) Payback Period 300 Incremental Investment Cumulative savings 250 Amount in lakh rupees Years D o D ;6;)7, 5$ $$$$023< o 8 D E; 92

lakh rupees 200 150 100 50 0 1 2 3 4 5 6 7

How To Design A Building In New Delhi

How To Design A Building In New Delhi ENERGY EFFICIENT HVAC DESIGN FOR COMPOSITE CLIMATE Overview of Design Conditions: Air conditioning system consumes most of the energy that a building needs in its operation. In order to reduce energy consumption