A building complies with this section by being designed with and having constructed and installed a space-conditioning system that meets the applicable prescriptive requirements of Subsections (a) through (q).
EXCEPTION 1 to Section 140.4(a)1: Where it can be demonstrated to the satisfaction of the enforcing agency that oversizing will not increase building TDV energy use.
EXCEPTION 2 to Section 140.4(a)1: Standby equipment with controls that allow the standby equipment to operate only when the primary equipment is not operating.
EXCEPTION 3 to Section 140.4(a)1: Multiple units of the same equipment type, such as multiple chillers and boilers, having combined capacities exceeding the design load, if they have controls that sequence or otherwise optimally control the operation of each unit based on load.
Single zone space conditioning systems with direct expansion cooling with rated cooling capacity 240,000 Btu/hr or less serving the following spaces shall meet the applicable requirements in A-H, or shall meet the performance compliance requirements of Section 140.1. All other system types, including systems with rated cooling capacity greater than 240,000 Btu/hr, multi-zone systems, and systems using central boilers or chillers, shall comply with the applicable requirements of Section 140.
EXCEPTION to Section 140.4(a)2: Systems utilizing recovered heat for space heating.
In making equipment sizing calculations under Subsection (a), all of the following rules shall apply:
EXCEPTION to Section 140.4(b)3: Cooling design temperatures for cooling towers shall be no greater than the 0.5 percent cooling design wet bulb values.
For each fan system that includes at least one fan or fan array with fan electrical input power ≥ 1 kW, fan system electrical input power (Fan kWdesign,system) determined per Section 140.4(c)1(B) at the fan system design airflow shall not exceed Fan kWbudget as calculated per Section 140.4(c)1(A).
Where
FPAadj = The corrected fan power allowance for the component in w/cfm
Qcomp = The airflow through component in cfm
Qsys = The fan system airflow in cfm
FPAcomp = The fan power allowance of the component from Table 140.4A or Table 140.4B
Airflow
|
Multi-Zone VAV Systems
≤5,000 cfm1 |
Multi-Zone VAV Systems >5,000 and ≤10,000 cfm1
|
Multi-Zone VAV Systems >10,000 cfm1
|
All Other Fan Systems ≤5,000 cfm
|
All Other Fan
Systems >5,000 and ≤10,000 cfm |
All Other Fan Systems>10,000 cfm
|
Supply System Base Allowance for AHU serving spaces ≤ 6 floors away).
|
0.395
|
0.453
|
0.413
|
0.232
|
0.256
|
0.236
|
Supply system base allowance for AHU serving spaces > 6 floors away
|
0.508
|
0.548
|
0.501
|
0.349
|
0.356
|
0.325
|
MERV 13 to MERV 16 Filter upstream of thermal conditioning equipment (two times the clean filter pressure drop)2
|
0.136
|
0.114
|
0.105
|
0.139
|
0.120
|
0.107
|
MERV 13 to MERV 16 Final filter downstream of thermal conditioning equipment. ( two times the clean filter pressure drop)2
|
0.225
|
0.188
|
0.176
|
0.231
|
0.197
|
0.177
|
Filtration allowance for > MERV 16 or HEPA Filter ( two times the clean filter pressure drop)2
|
0.335
|
0.280
|
0.265
|
0.342
|
0.292
|
0.264
|
Central Hydronic heating coil allowance
|
0.046
|
0.048
|
0.052
|
0.046
|
0.050
|
0.054
|
Electric heat allowance
|
0.046
|
0.038
|
0.035
|
0.046
|
0.040
|
0.036
|
Gas heat allowance
|
0.069
|
0.057
|
0.070
|
0.058
|
0.060
|
0.072
|
Hydronic/DX cooling coil or heat pump coil (wet) allowance3
|
0.135
|
0.114
|
0.105
|
0.139
|
0.120
|
0.107
|
Solid or liquid Desiccant system allowance
|
0.157
|
0.132
|
0.123
|
0.163
|
0.139
|
0.124
|
Reheat Coil for Dehumidification Allowance
|
0.045
|
0.038
|
0.035
|
0.046
|
0.040
|
0.036
|
Allowance for Evaporative humidifier/cooler in series with a cooling coil. Value shown is allowed watts/cfm per 1.0 Inches of water gauge (in.w.g.) Determine pressure loss (in.w.g.) at 400 fpm or maximum velocity allowed by the manufacturer, whichever is less. [Calculation required, see note 4]
|
0.224
|
0.188
|
0.176
|
0.231
|
0.197
|
0.177
|
Allowance for 100% Outdoor air system5.
|
0.000
|
0.000
|
0.000
|
0.070
|
0.100
|
0.107
|
Energy recovery allowance for 0.50 ≤ ERR <0.556
|
0.135
|
0.114
|
0.105
|
0.139
|
0.120
|
0.107
|
Energy recovery allowance for 0.55 ≤ ERR <0.606
|
0.160
|
0.134
|
0.124
|
0.165
|
0.141
|
0.126
|
Energy recovery allowance for 0.60 ≤ ERR <0.656
|
0.184
|
0.155
|
0.144
|
0.190
|
0.163
|
0.146
|
Energy recovery allowance for 0.65 ≤ ERR <0.706
|
0.208
|
0.175
|
0.163
|
0.215
|
0.184
|
0.165
|
Energy recovery allowance for 0.70 ≤ ERR <0.756
|
0.232
|
0.196
|
0.183
|
0.240
|
0.205
|
0.184
|
Energy recovery allowance for 0.75 ≤ ERR <0.806
|
0.257
|
0.216
|
0.202
|
0.264
|
0.226
|
0.203
|
Energy recovery allowance for ERR ≥ 0.806
|
0.281
|
0.236
|
0.222
|
0.289
|
0.247
|
0.222
|
Coil Runaround Loop
|
0.135
|
0.114
|
0.105
|
0.139
|
0.120
|
0.107
|
Allowance for Gas phase filtration. Value shown is allowed w/cfm per 1.0 in. wg air pressure drop. [Calculation required, see note 4]
|
0.224
|
0.188
|
0.176
|
0.231
|
0.197
|
0.177
|
Economizer Return Damper
|
0.045
|
0.038
|
0.035
|
0.046
|
0.040
|
0.036
|
Air blender allowance
|
0.045
|
0.038
|
0.035
|
0.046
|
0.040
|
0.036
|
Sound attenuation section [fans serving spaces with design background noise goals below NC35]
|
0.034
|
0.029
|
0.026
|
0.035
|
0.030
|
0.027
|
Deduction for systems that feed a terminal unit with a fan with electrical input power < 1kW
|
-0.100
|
-0.100
|
-0.100
|
-0.100
|
-0.100
|
-0.100
|
Low-turndown single-zone VAV fan systems meeting the requirements in note 7.
|
0.000
|
0.000
|
0.000
|
0.070
|
0.100
|
0.089
|
Airflow
|
Multi-Zone VAV Systems1 ≤5,000 cfm
|
Multi-Zone VAV Systems1 >5,000 and ≤10,000 cfm
|
Multi-Zone VAV Systems1 >10,000 cfm
|
All Other Fan Systems ≤5,000 cfm
|
All Other Fan Systems >5,000 and ≤10,000 cfm
|
All Other Fan Systems >10,000 cfm
|
Exhaust System Base Allowance
|
0.221
|
0.246
|
0.236
|
0.186
|
0.184
|
0.190
|
Filter (any MERV value)2
|
0.046
|
0.041
|
0.036
|
0.046
|
0.041
|
0.035
|
Energy Recovery Allowance For 0.50 ≤ ERR <0.55 3
|
0.139
|
0.120
|
0.107
|
0.139
|
0.123
|
0.109
|
Energy Recovery Allowance For 0.55 ≤ ERR <0.60 3
|
0.165
|
0.142
|
0.126
|
0.165
|
0.144
|
0.128
|
Energy Recovery Allowance For 0.60 ≤ ERR <0.65 3
|
0.190
|
0.163
|
0.146
|
0.191
|
0.166
|
0.148
|
Energy Recovery Allowance For 0.65 ≤ ERR <0.70 3
|
0.215
|
0.184
|
0.165
|
0.216
|
0.188
|
0.167
|
Energy Recovery Allowance For 0.70 ≤ ERR <0.75 3
|
0.240
|
0.206
|
0.184
|
0.241
|
0.209
|
0.186
|
Energy Recovery Allowance For 0.75 ≤ ERR <0.80 3
|
0.265
|
0.227
|
0.203
|
0.266
|
0.231
|
0.205
|
Energy Recovery Allowance For ERR ≥ 0.80 3
|
0.289
|
0.248
|
0.222
|
0.291
|
0.252
|
0.225
|
Coil Runaround Loop
|
0.139
|
0.120
|
0.107
|
0.139
|
0.123
|
0.109
|
Return or exhaust systems required by code or accreditation standards to be fully ducted, or systems required to maintain air pressure differentials between adjacent rooms
|
0.116
|
0.100
|
0.089
|
0.116
|
0.102
|
0.091
|
Return and/or exhaust airflow control devices required for space pressurization control
|
0.116
|
0.100
|
0.089
|
0.116
|
0.102
|
0.091
|
Laboratory and vivarium exhaust systems in high-rise buildings for vertical duct exceeding 75 ft. Value shown is allowed w/cfm per 0.25 in. wg for each 100 feet exceeding 75 feet. [Calculation required, see note 4]
|
0.058
|
0.051
|
0.045
|
0.058
|
0.052
|
0.046
|
Biosafety cabinet. Value shown is allowed w/cfm per 1.0 in. wg air pressure drop. [Calculation required, see note 4]
|
0.231
|
0.198
|
0.177
|
0.232
|
0.202
|
0.179
|
Exhaust filters, scrubbers, or other exhaust treatment required by code or standard. Value shown is allowed w/cfm per 1.0 in. wg air pressure drop. [Calculation required, see note 4]
|
0.231
|
0.198
|
0.177
|
0.232
|
0.202
|
0.179
|
Healthcare facility allowance5
|
0.231
|
0.198
|
0.177
|
0.232
|
0.202
|
0.179
|
Sound attenuation section [Fans serving spaces with design background noise goals below NC35.]
|
0.035
|
0.030
|
0.027
|
0.035
|
0.031
|
0.028
|
Altitude (ft)
|
Correction Factor
|
<3,000
|
1.000
|
≥3,000 and <4,000
|
0.896
|
≥4,000 and <5,000
|
0.864
|
≥5,000 and <6,000
|
0.832
|
≥6,000
|
0.801
|
Motor Nameplate HP
|
Default Fan kWdesign with variable speed drive (Fan kWdesign)
|
Default Fan kWdesign without variable speed drive(Fan kWdesign)
|
<1
|
0.96
|
0.89
|
≥1 and <1.5
|
1.38
|
1.29
|
≥1.5 and <2
|
1.84
|
1.72
|
≥2 and <3
|
2.73
|
2.57
|
≥3 and <5
|
4.38
|
4.17
|
≥5 and <7.5
|
6.43
|
6.15
|
≥7.5 and <10
|
8.46
|
8.13
|
≥10 and <15
|
12.47
|
12.03
|
≥15 and <20
|
16.55
|
16.04
|
≥20 and <25
|
20.58
|
19.92
|
≥25 and <30
|
24.59
|
23.77
|
≥30 and <40
|
32.74
|
31.70
|
≥40 and <50
|
40.71
|
39.46
|
≥50 and <60
|
48.50
|
47.10
|
≥60 and <75
|
60.45
|
58.87
|
≥75 and ≤100
|
80.40
|
78.17
|
EXCEPTION to Section 140.4(c): Fan system power caused solely by process loads.
EXCEPTION 1 to Section 140.4(d): Zones with special pressurization relationships or cross-contamination control needs.
EXCEPTION 2 to Section 140.4(d): Zones served by space-conditioning systems in which at least 75 percent of the energy for reheating, or providing warm air in mixing systems, is provided from a site-recovered or site-solar energy source.
EXCEPTION 3 to Section 140.4(d): Zones in which specific humidity levels are required to satisfy exempt process loads. Computer rooms or other spaces where the only process load is from IT equipment may not use this exception.
EXCEPTION 4 to Section 140.4(d): Zones with a peak supply-air quantity of 300 cfm or less.
EXCEPTION 5 to Section 140.4(d): Systems serving healthcare facilities.
EXCEPTION 1 to Section 140.4(e)1: Where special outside air filtration and treatment, for the reduction and treatment of unusual outdoor contaminants, makes compliance infeasible.
EXCEPTION 2 to Section 140.4(e)1: Where the use of outdoor air for cooling will affect other systems, such as humidification, dehumidification, or supermarket refrigeration systems, so as to increase overall building TDV energy use.
EXCEPTION 3 to Section 140.4(e)1: Systems serving hotel/motel guest rooms.
EXCEPTION 4 to Section 140.4(e)1: Where comfort cooling systems have the cooling efficiency that meets or exceeds the cooling efficiency improvement requirements in TABLE 140.4-F.
EXCEPTION 5 to Section 140.4(e)1: Fan systems primarily serving computer rooms. See Section 140.9(a) for computer room economizer requirements.
EXCEPTION 6 to Section 140.4(e)1: In all climate zones, each air handler that has a design total mechanical cooling capacity less than 54,000 Btu/hr where ventilation is provided by a dedicated outdoor air system (DOAS) with exhaust air heat recovery in accordance with Section 140.4(p) and the following:
-
The DOAS unit shall provide at least the minimum ventilation air flow rate as specified in Section 120.1(c)3 and provide no less than 0.3 cfm/ft2 during economizer conditions.
EXCEPTION 7 to Section 140.4(e)1: Where the use of an air economizer in controlled environment horticulture spaces will affect carbon dioxide enrichment systems.
Climate Zones
|
Total Building Chilled Water System Capacity, Minus Capacity of the Cooling units with Air Economizers
| |
Building Water-Cooled Chilled Water System
|
Air-Cooled Chilled Water Systems or District Chilled Water Systems
| |
15
|
≥ 960,000 Btu/h (280 kW)
|
≥ 1,250,000 Btu/h (365 kW)
|
1-14
|
≥720,000 Btu/h (210 kW)
|
≥940,000 Btu/h (275 kW)
|
16
|
≥1,320,000 Btu/h (385 kW)
|
≥1,720,000 Bu/h (505 kW)
|
Climate Zone | Efficiency Improvement a | a If a unit is rated with an annualized or part-load metric, then to eliminate the required economizer, only the applicable minimum cooling efficiency of the unit must be increased by the percentage shown. If the unit is only rated with a full load metric, like EER or COP cooling, then that metric must be increased by the percentage shown. To determine the efficiency required to eliminate the economizer, when the unit equipment efficiency is rated with an energy-input divided by work-output metric, the metric shall first be converted to COP prior to multiplying by the efficiency improvement percentage and then converted back to the rated metric. |
1 | 70% | |
2 | 65% | |
3 | 65% | |
4 | 65% | |
5 | 70% | |
6 | 30% | |
7 | 30% | |
8 | 30% | |
9 | 30% | |
10 | 30% | |
11 | 30% | |
12 | 30% | |
13 | 30% | |
14 | 30% | |
15 | 30% | |
16 | 70% |
EXCEPTION to Section 140.4(e)2A: Systems that provide 75 percent of the annual energy used for mechanical heating from site-recovered energy or a site-solar energy source.
Device Typea |
Required High Limit (Economizer Off When): |
||
Equationb |
Description |
||
Fixed Dry Bulb |
1, 3, 5, 11-16 |
TOA > 75°F |
Outdoor air temperature exceeds 75°F |
2, 4, 10 |
TOA > 73°F |
Outdoor air temperature exceeds 73°F |
|
6, 8, 9 |
TOA > 71°F |
Outdoor air temperature exceeds 71°F |
|
7 |
TOA > 69°F |
Outdoor air temperature exceeds 69°F |
|
Differential Dry Bulb |
1, 3, 5, 11-16 |
TOA > TRA°F |
Outdoor air temperature exceeds return air temperature |
2, 4, 10 |
TOA > TRA-2°F |
Outdoor air temperature exceeds return air temperature minus 2°F |
|
6, 8, 9 |
TOA > TRA-4°F |
Outdoor air temperature exceeds return air temperature minus 4°F |
|
7 |
TOA > TRA-6°F |
Outdoor air temperature exceeds return air temperature minus 6°F |
|
Fixed Enthalpyc + Fixed Drybulb |
All |
hOA > 28 Btu/lbc or TOA > 75°F |
Outdoor air enthalpy exceeds 28 Btu/lb of dry airc or Outdoor air temperature exceeds 75°F |
a Only the high limit control devices listed are allowed to be used and at the setpoints listed. Others such as Dew Point, Fixed Enthalpy, Electronic Enthalpy, and Differential Enthalpy Controls, may not be used in any Climate Zone for compliance with Section 140.4(e)1 unless approval for use is provided by the Energy Commission Executive Director. b Devices with selectable (rather than adjustable) setpoints shall be capable of being set to within 2°F and 2 Btu/lb of the setpoint listed. c At altitudes substantially different than sea level, the Fixed Enthalpy limit value shall be set to the enthalpy value at 75°F and 50% relative humidity. As an example, at approximately 6,000 foot elevation, the fixed enthalpy limit is approximately 30.7 Btu/lb. |
Cooling Capacity
|
Minimum Number of Mechanical Cooling Stages
|
Minimum Compressor Displacement
|
≥ 65,000 Btu/h and
< 240,000 Btu/h |
3 stages
|
≤ 35% full load
|
≥ 240,000 Btu/h
|
4 stages
|
≤ 25% full load
|
-
In response to representative building loads or to outdoor air temperature; and
-
At least 25 percent of the difference between the design supply-air temperature and the design room air temperature.
EXCEPTION 1 to Section 140.4(f): Systems that meet the requirements of Section 140.4(d)1, without using Exception 1 to that section.
EXCEPTION 2 to Section 140.4(f): Where supply-air temperature reset would increase overall building energy use.
EXCEPTION 3 to Section 140.4(f): Systems supplying zones in which specific humidity levels are required to satisfy process loads. Computer Rooms or other spaces with only IT equipment may not use this exception.
EXCEPTION 4 to Section 140.4(f): Systems serving healthcare facilities.
EXCEPTION 1 to Section 140.4(g): Where an electric-resistance heating system supplements a heating system in which at least 60 percent of the annual energy requirement is supplied by site-solar or recovered energy.
EXCEPTION 2 to Section 140.4(g): Where an electric-resistance heating system supplements a heat pump heating system, and the heating capacity of the heat pump is more than 75 percent of the design heating load calculated in accordance with Section 140.4(a) at the design outdoor temperature specified in Section 140.4(b)4.
EXCEPTION 3 to Section 140.4(g): Where the total capacity of all electric-resistance heating systems serving the entire building is less than 10 percent of the total design output capacity of all heating equipment serving the entire building.
EXCEPTION 4 to Section 140.4(g): Where the total capacity of all electric-resistance heating systems serving the entire building, excluding those allowed under Exception 2, is no more than 3 kW.
EXCEPTION 5 to Section 140.4(g): Where an electric resistance heating system serves an entire building that is not a hotel/motel building; and has a conditioned floor area no greater than 5,000 square feet; and has no mechanical cooling; and is in an area where natural gas is not currently available.
EXCEPTION 6 to Section 140.4(g): heating systems serving as emergency backup to gas heating equipment.
EXCEPTION 1 to Section 140.4(h)1: Heat rejection devices included as an integral part of the equipment listed in TABLE 110.2-A through TABLE 110.2-N.
EXCEPTION 2 to Section 140.4(h)1: Condenser fans serving multiple refrigerant circuits.
EXCEPTION 3 to Section 140.4(h)1: Condenser fans serving flooded condensers.
EXCEPTION 4 to Section 140.4(h)1: Up to one third of the fans on a condenser or tower with multiple fans where the lead fans comply with the speed control requirement.
EXCEPTION 1 to Section 140.4(h)3: Cooling towers that are ducted (inlet or discharge) or have an external sound trap that requires external static pressure capability.
EXCEPTION 2 to Section 140.4(h)3: Cooling towers that meet the energy efficiency requirement for propeller fan towers in Section 110.2, Table 110.2-F.
EXCEPTION 1 to Section 140.4(h)5: Replacement of existing cooling towers that are inside an existing building or on an existing roof.
EXCEPTION 2 to Section 140.4(h)5: Cooling towers serving buildings in Climate Zone 1 or 16.
EXCEPTION 1 to Section 140.4(i): Chillers with electrical service > 600V.
EXCEPTION 2 to Section 140.4(i): Chillers attached to a heat recovery system with a design heat recovery capacity > 40 percent of the design chiller cooling capacity.
EXCEPTION 3 to Section 140.4(i): Chillers used to charge thermal energy storage systems where the charging temperature is < 40 F.
EXCEPTION 4 to Section 140.4(i): In buildings with more than three chillers, only three chillers are required to meet the Path B efficiencies.
EXCEPTION 1 to Section 140.4(j): Where the water quality at the building site fails to meet manufacturer’s specifications for the use of water-cooled chillers.
EXCEPTION 2 to Section 140.4(j): Chillers that are used to charge a thermal energy storage system with a design temperature of less than 40° F (4° C).
EXCEPTION 3 to Section 140.4(j): Systems serving healthcare facilities.
EXCEPTION 1 to Section 140.4(k)1: Systems that include no more than three control valves.
EXCEPTION 2 to Section 140.4(k)1: Systems having a total pump system power less than or equal to 1.5 hp.
EXCEPTION 1 to Section 140.4(k)4: Hydronic systems that use variable flow to reduce pumping energy in accordance with Section 140.4(k)1.
EXCEPTION 2 to Section 140.4(k)4: Systems serving healthcare facilities.
EXCEPTION 1 to Section 140.4(k)6: Heating hot water systems.
EXCEPTION 2 to Section 140.4(k)6: Condenser water systems serving only water-cooled chillers.
EXCEPTION to Section 140.4(k)7: Where a system loop temperature optimization controller is used to determine the most efficient operating temperature based on real-time conditions of demand and capacity, deadbands of less than 20°F shall be allowed.
EXCEPTION 1 to Section 140.4(k)8: Where 25 percent of the annual space heating requirement is provided by on-site renewable energy, site-recovered energy, or heat recovery chillers.
EXCEPTION 2 to Section 140.4(k)8: Space heating boilers installed in individual dwelling units.
EXCEPTION 3 to Section 140.4(k)8: Where 50 percent or more of the design heating load is served using perimeter convective heating, radiant ceiling panels or both.
EXCEPTION 4 to Section 140.4(k)8: Individual gas boilers with input capacity less than 300,000 Btu/h shall not be included in the calculations of the total system input or total system efficiency.
EXCEPTION 1 to Section 140.4(m): Modulating fan control is not required for chilled water systems with all fan motors <1 HP, or for evaporative systems with all fan motors < 1 HP, if the systems are not used to provide ventilation air and all indoor fans cycle with the load.
EXCEPTION 2 to Section 140.0(m): Systems serving healthcare facilities.
Cooling System Type
|
Fan Motor Size
|
Cooling Capacity
|
DX Cooling
|
any
|
≥ 65,000 Btu/hr
|
Chilled Water and Evaporative
|
≥ 1/4 HP
|
any
|
EXCEPTION 1 to Section 140.4(n): Interlocks are not required on doors with automatic closing devices.
EXCEPTION 2 to Section 140.4(n): Any space without a thermostatic control (thermostat or a space temperature sensor used to control heating or cooling to the space).
EXCEPTION 3 to Section 140.4(n): Healthcare facilities.
-
The supply flow required to meet the space heating or cooling load; or
-
The ventilation rate required by the authority having jurisdiction, the facility Environmental Health and Safety Department, or by Section 120.1(c)3; or
-
The mechanical exhaust flow minus the available transfer air. Available transfer air shall be from another conditioned space or return air plenums on the same floor and same smoke or fire compartment, and that at their closest point are within 15 feet of each other.
EXCEPTION 1 to Section 140.4(o): Biosafety level classified laboratories 3 or higher.
EXCEPTION 2 to Section 140.4(o): Vivarium spaces.
EXCEPTION 3 to Section 140.4(o): Spaces that are required by applicable codes and standards to be maintained at a positive pressure differential relative to adjacent spaces.
EXCEPTION 4 to Section 140.4(o): Spaces where the highest amount of transfer air that could be used for exhaust makeup may exceed the available transfer airflow rate and where the spaces have a required negative pressure relationship.
EXCEPTION 5 to Section 140.4(o): Healthcare facilities.
-
DOAS unit fan systems with input power less than 1 kW shall not exceed a total combined fan power of 1.0 W/cfm. DOAS with fan power greater than or equal to 1 kW shall meet the requirements of Section 140.4(c).
-
The DOAS supply air shall be delivered directly to the occupied space or at the outlet of any terminal heating or cooling coils and shall cycle off any zone heating and cooling equipment fans, circulation pumps, and terminal unit fans when there is no call for heating or cooling in the zone.
EXCEPTION 1 to Section 140.4(p)2: Active chilled beam systems.
EXCEPTION 2 to Section 140.4(p)2: Sensible-only cooling terminal units with pressure-independent variable-airflow regulating devices limiting the DOAS supply air to the greater of latent load or minimum ventilation requirements.
EXCEPTION 3 to Section 140.4(p)2: Any configuration where a DOAS unit provides ventilation air to a downstream fan (a terminal box, air handling unit, or other space conditioning equipment) where the total system airflow can be reduced to ventilation minimum or the downstream fan power is no greater than 0.12 Watts per cfm when space temperatures are within the thermostat dead band (at low speed per manufacturer’s literature). -
DOAS supply and exhaust fans shall have a minimum of three speeds to facilitate system balancing.
-
DOAS with mechanical cooling providing ventilation to multiple zones and operating in conjunction with zone heating and cooling systems shall not use heating or heat recovery to warm supply air above 60°F when representative building loads or outdoor air temperature indicate that the majority of zones require cooling.
-
A sensible energy recovery ratio of at least 60 percent or an enthalpy recovery ratio of at least 50 percent for both heating and cooling design conditions and a rating in accordance to AHRI 1060.
-
Energy recovery bypass or control to disable energy recovery and to directly economize with ventilation air based on outdoor air temperature limits specified in TABLE 140.4-G. For energy recovery systems where the transfer of energy cannot be stopped, bypass shall prevent the total airflow rate of either outdoor air or exhaust air through the energy recovery exchanger from exceeding 10% of the full design airflow rate.
EXCEPTION to Section 140.4(q)2: For DOAS units with the capability to shut off when a separate space-conditioning system serving the same space meets the economizer requirements in section 140.4(e)1A.
EXCEPTION 1 to Section 140.4(q): Systems meeting Section 140.9(c) Prescriptive Requirements for Laboratory and Factory Exhaust Systems.
EXCEPTION 2 to Section 140.4(q): Systems serving spaces that are not cooled and that are heated to less than 60°F.
EXCEPTION 3 to Section 140.4(q): Where more than 60 percent of the outdoor air heating energy is provided from site-recovered energy in Climate Zone 16.
EXCEPTION 4 to Section 140.4(q): Sensible recovery ratio requirements at heating design conditions are exempted for Climate Zone 15.
EXCEPTION 5 to Section 140.4(q): Sensible recovery ratio requirements at cooling design conditions are exempted for Climate Zone 1.
EXCEPTION 6 to Section 140.4(q): Where the sum of the airflow rates exhausted and relieved within 20 feet of each other is less than 75 percent of the design outdoor airflow rate, excluding exhaust air that is either:
-
used for another energy recovery system,
-
not allowed by the California Mechanical Code (Title 24, Part 4) (CMC)for use in energy recovery systems with leakage potential, or
-
of Class 4 as specified in Section 120.1(g).
EXCEPTION 7 to Section 140.4(q): Systems expected to operate less than 20 hours per week.
% Outdoor Air at Full Design Airflow
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
16
|
≥10% and <20%
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
≥20% and <30%
|
≥15,000
|
≥20,000
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
≥18,500
|
≥18,500
|
≥18,500
|
≥18,500
|
≥18,500
|
≥18,500
|
≥30% and <40%
|
≥13,000
|
≥15,000
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
≥15,000
|
≥15,000
|
≥15,000
|
≥15,000
|
≥15,000
|
≥15,000
|
≥40% and <50%
|
≥10,000
|
≥12,000
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
≥22,000
|
≥10,000
|
≥10,000
|
≥10,000
|
≥10,000
|
≥10,000
|
≥10,000
|
≥50% and <60%
|
≥9,000
|
≥10,000
|
NR
|
≥18,500
|
NR
|
NR
|
NR
|
NR
|
NR
|
≥17,000
|
≥8,000
|
≥8,000
|
≥8,000
|
≥8,000
|
≥8,000
|
≥8,000
|
≥60% and <70%
|
≥7,000
|
≥7,500
|
NR
|
≥16,500
|
NR
|
NR
|
NR
|
NR
|
≥20,000
|
≥15,000
|
≥7,000
|
≥7,000
|
≥7,000
|
≥7,000
|
≥7,000
|
≥7,000
|
≥70% and <80%
|
≥6,500
|
≥7,000
|
NR
|
≥15,000
|
NR
|
NR
|
NR
|
NR
|
≥17,000
|
≥14,000
|
≥5,000
|
≥5,000
|
≥5,000
|
≥5,000
|
≥5,000
|
≥5,000
|
≥80%
|
≥4,500
|
≥6,500
|
NR
|
≥14,000
|
NR
|
NR
|
NR
|
NR
|
≥15,000
|
≥13,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
% Outdoor Air at Full Design Airflow
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
16
|
≥10% and <20%
|
≥10,000
|
≥10,000
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
NR
|
≥40,000
|
≥40,000
|
≥20,000
|
≥10,000
|
≥10,000
|
≥10,000
|
≥10,000
|
≥20% and <30%
|
≥2,000
|
≥5,000
|
≥13,000
|
≥9,000
|
≥9,000
|
NR
|
NR
|
NR
|
NR
|
≥15,000
|
≥15,000
|
≥5,000
|
≥5,000
|
≥5,000
|
≥5,000
|
≥5,000
|
≥30% and <40%
|
≥2,000
|
≥3,000
|
≥10,000
|
≥6,500
|
≥6,500
|
NR
|
NR
|
NR
|
≥15,000
|
≥7,500
|
≥7,500
|
≥3,000
|
≥3,000
|
≥3,000
|
≥3,000
|
≥3,000
|
≥40% and <50%
|
≥2,000
|
≥2,000
|
≥8,000
|
≥6,000
|
≥6,000
|
NR
|
NR
|
NR
|
≥12,000
|
≥6,000
|
≥6,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥50% and <60%
|
≥2,000
|
≥2,000
|
≥7,000
|
≥6,000
|
≥6,000
|
NR
|
NR
|
≥20,000
|
≥10,000
|
≥5,000
|
≥5,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥60% and <70%
|
≥2,000
|
≥2,000
|
≥6,000
|
≥6,000
|
≥6,000
|
NR
|
NR
|
≥18,000
|
≥9,000
|
≥4,000
|
≥4,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥70% and <80%
|
≥2,000
|
≥2,000
|
≥6,000
|
≥5,000
|
≥5,000
|
NR
|
NR
|
≥15,000
|
≥8,000
|
≥3,000
|
≥3,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥80%
|
≥2,000
|
≥2,000
|
≥6,000
|
≥5,000
|
≥5,000
|
NR
|
NR
|
≥12,000
|
≥7,000
|
≥3,000
|
≥3,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
≥2,000
|
Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.8, and 25943, Public Resources Code