Page 210 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

188 Cha pte r F o u r

D. HFC-245fa
E. HFC-407c
F. HFC-410a
12. For a typical 15-year life HVAC&R unit, calculate the maximum allowable equipment
refrigerant charge (Rc ) per ton that a single unit may have, based on the default values for leakages
i ac
and losses in order to be compliant with LEED 2009 EAc4 for the following refrigerants:
A. HCFC-22
B. HCFC-123
C. HFC-134a
D. HFC-245fa
E. HFC-407c
F. HFC-410a

13. For a typical 20-year life HVAC&R unit, calculate the maximum allowable equipment
refrigerant charge (Rc ) per ton that a single unit may have, based on the default values for leakages
i ac
and losses in order to be compliant with LEED 2009 EAc4 for the following refrigerants:
A. HCFC-22
B. HCFC-123
C. HFC-134a
D. HFC-245fa
E. HFC-407c
F. HFC-410a
14. For a typical 23-year life HVAC&R unit, calculate the maximum allowable equipment
refrigerant charge (Rc ) per ton that a single unit may have, based on the default values for leakages
i ac
and losses in order to be compliant with LEED 2009 EA credit 4 for the following refrigerants:
A. HCFC-22
B. HCFC-123
C. HFC-134a
D. HFC-245fa
E. HFC-407c
F. HFC-410a
15 Simplify Eqs. (4.4.1) and (4.4.2) for a unit with a 15-year life using the default values of leakage
and loss.

LCODP = [Lr + (Mr /Life )](ODP × Rc ) (4.4.1)
i i i i r i
LCGWP = [Lr + (Mr /Life )](GWP × Rc ) (4.4.2)
i i i i r i
16 Simplify Eqs. (4.4.1) and (4.4.2) for a unit with a 20-year life using the default values of leakage
and loss.
17. Simplify Eqs. (4.4.1) and (4.4.2) for a unit with a 23-year life using the default values of
leakage and loss.
18. Derive Eqs. (4.7.2) and (4.7.3) from the information given in the text and verify the point
total.
19. Which, if any, of the EA credits are available for Regional Priority points in the zip code of
your work or school? (See Chap. 7.)