CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 86—CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES > SUBPART B—Emission Regulations for 1977 and Later Model Year New Light-Duty Vehicles and New Light-Duty Trucks and New Otto-Cycle Complete Heavy-Duty Vehicles; Test Procedures (§86.101 to > 86.166-12—Method for calculating emissions due to air conditioning leakage.

86.166-12—Method for calculating emissions due to air conditioning leakage.

This section describes procedures used to determine a refrigerant leakage rate in grams per year from vehicle-based air conditioning units. The results of this test are used to determine air conditioning leakage credits according to § 86.1866-12(b).
(a) Emission totals. Calculate an annual rate of refrigerant leakage from an air conditioning system using the following equation:

Code of Federal Regulations

Grams/YRTOT = Grams/YRRP Grams/YRSP Grams/YRFH Grams/YRMC Grams/YRC
Where:
Grams/YRTOT = Total air conditioning system emission rate in grams per year and rounded to the nearest tenth of a gram per year.
Grams/YRRP = Emission rate for rigid pipe connections as described in paragraph (b) of this section.
Grams/YRSP = Emission rate for service ports and refrigerant control devices as described in paragraph (c) of this section.
Grams/YRFH = Emission rate for flexible hoses as described in paragraph (d) of this section.
Grams/YRMC = Emission rate for heat exchangers, mufflers, receiver/driers, and accumulators as described in paragraph (e) of this section.
Grams/YRC = Emission rate for compressors as described in paragraph (f) of this section.
(b) Rigid pipe connections. Determine the grams per year emission rate for rigid pipe connections using the following equation:

Code of Federal Regulations

Grams/YRRP = 0.00522 × [(125 × SO) (75 × SCO) (50 × MO) (10 × SW) (5 × SWO) (MG)]
Where:
Grams/YRRP = Total emission rate for rigid pipe connections in grams per year.
SO = The number of single O-ring connections.
SCO = The number of single captured O-ring connections.
MO = The number of multiple O-ring connections.
SW = The number of seal washer connections.
SWO = The number of seal washer with O-ring connections.
MG = The number of metal gasket connections.
(c) Service ports and refrigerant control devices. Determine the grams per year emission rate for service ports and refrigerant control devices using the following equation:

Code of Federal Regulations

Grams/YRSP = 0.522 × [(0.3 × HSSP) (0.2 × LSSP) (0.2 × STV) (0.2 × TXV)]
Where:
Grams/YRSP = The emission rate for service ports and refrigerant control devices, in grams per year.
HSSP = The number of high side service ports.
LSSP = The number of low side service ports.
STV = The total number of switches, transducers, and pressure relief valves.
TXV = The number of refrigerant control devices.
(d) Flexible hoses. Determine the permeation emission rate in grams per year for each segment of flexible hose using the following equation, and then sum the values for all hoses in the system to calculate a total flexible hose emission rate for the system. Hose end connections shall be included in the calculations in paragraph (b) of this section.

Code of Federal Regulations

Grams/YRFH = 0.00522 × (3.14159 × ID × L × ER)
Where:
Grams/YRFH = Emission rate for a segment of flexible hose in grams per year.
ID = Inner diameter of hose, in millimeters.
L = Length of hose, in millimeters.
ER = Emission rate per unit internal surface area of the hose, in g/mm2. Select the appropriate value for ER from the following table:
Material/configuration ER
High-pressure side Low-pressure side
All rubber hose 0.0216 0.0144
Standard barrier or veneer hose 0.0054 0.0036
Code of Federal Regulations 614
Ultra-low permeation barrier or veneer hose 0.00225 0.00167
(e) Heat exchangers, mufflers, receiver/driers, and accumulators. Use an emission rate of 0.261 grams per year as a combined value for all heat exchangers, mufflers, receiver/driers, and accumulators (Grams/YRMC ).
(f) Compressors. Determine the emission rate for compressors using the following equation, except that the final term in the equation (“1500/SSL”) is not applicable to electric (or semi-hermetic) compressors:

Code of Federal Regulations

Grams/YRC = 0.00522 × [(300 × OHS) (200 × MHS) (150 × FAP) (100 × GHS) (1500/SSL)]
Where:
Grams/YRC = The emission rate for the compressors in the air conditioning system, in grams per year.
OHS = The number of O-ring housing seals.
MHS = The number of molded housing seals.
FAP = The number of fitting adapter plates.
GHS = The number of gasket housing seals.
SSL = The number of lips on shaft seal (for belt-driven compressors only).
(g) Definitions. The following definitions apply to this section:
(1) All rubber hose means a Type A or Type B hose as defined by SAE J2064 with a permeation rate not greater than 15 kg/m 2 /year when tested according to SAE J2064. SAE J2064 is incorporated by reference; see § 86.1.
(2) Standard barrier or veneer hose means a Type C, D, E, or F hose as defined by SAE J2064 with a permeation rate not greater than 5 kg/m 2 /year when tested according to SAE J2064. SAE J2064 is incorporated by reference; see § 86.1.
(3) Ultra-low permeation barrier or veneer hose means a hose with a permeation rate not greater than 1.5 kg/m 2 /year when tested according to SAE J2064. SAE J2064 is incorporated by reference; see § 86.1.

Code of Federal Regulations

[75 FR 25681, May 7, 2010]