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Hello,

I'm currently working with two (600,000 Btuh, 130 Gallons, 97 EF) boilers for a dormitory building. From my interpretation of Table 7.8 the equation I'm suppose to use is 80%Et(Q/800 +110sqrt(V)) SL, Btuh. From I've what I've read, I'm suppose to disregard the 80% Et and that leaves me for the remainder of the equation (600000/800 + 110sqrt(130)) to get 2004 Btuh as my stand by loss for my baseline water heaters. A few questions I had were:

1. Should I leave this number in the service water heating section as what I calculated as for the SL or do I need to convert this to an EF ?

2. Is there a way to convert to this to an efficiency (EF)?

In previous projects my co-worker worked on they always left as a % EF on the MEP calculator and used that along with the HW usage to calculate an energy usage in MBH/hr for each water heater. They then plugged that energy usage into Trace 700 for the base utilities for the water heaters.

Hello,

I'm currently working with two (600,000 Btuh, 130 Gallons, 97 EF) boilers for a dormitory building. From my interpretation of Table 7.8 the equation I'm suppose to use is 80%Et(Q/800 +110sqrt(V)) SL, Btuh. From I've what I've read, I'm suppose to disregard the 80% Et and that leaves me for the remainder of the equation (600000/800 + 110sqrt(130)) to get 2004 Btuh as my stand by loss for my baseline water heaters. A few questions I had were:

1. Should I leave this number in the service water heating section as what I calculated as for the SL or do I need to convert this to an EF ?

2. Is there a way to convert to this to an efficiency (EF)?

In previous projects my co-worker worked on they always left as a % EF on the MEP calculator and used that along with the HW usage to calculate an energy usage in MBH/hr for each water heater. They then plugged that energy usage into Trace 700 for the base utilities for the water heaters.