Ivan Lim
27-05-2008, 03:37 AM
Hi,
Was wondering anybody has a simplified method for an atmospheric condenser sizing or calculations. For example; say Condensing Load = 1320KW, Tc = +40degC, Refrigerant = NH3, Ambient Air Temp = +35degC, Intended Pipe SIze to be used = 2inches API Sch 40 Black Steel Pipes 5.8m per lgth.
Queries:
1. What value should we use for U (Kcal/h/m2)?
2. For area, do we use the internal area of the said pipes or the external area of the said pipes. This make a lot of different in terms of the numbers of pipes required for the given condensing load.
3. Do we need to still "spray" water over the atmospheric condenser or there is no need to do this?
4. Is ambient air temp of +35degC here in Asia a realistic assumption or it is OK to use say, +30degC. because again, materials used can be reduced substantially.
Awaits forumers comments.
Thanks,
Ivan
Was wondering anybody has a simplified method for an atmospheric condenser sizing or calculations. For example; say Condensing Load = 1320KW, Tc = +40degC, Refrigerant = NH3, Ambient Air Temp = +35degC, Intended Pipe SIze to be used = 2inches API Sch 40 Black Steel Pipes 5.8m per lgth.
Queries:
1. What value should we use for U (Kcal/h/m2)?
2. For area, do we use the internal area of the said pipes or the external area of the said pipes. This make a lot of different in terms of the numbers of pipes required for the given condensing load.
3. Do we need to still "spray" water over the atmospheric condenser or there is no need to do this?
4. Is ambient air temp of +35degC here in Asia a realistic assumption or it is OK to use say, +30degC. because again, materials used can be reduced substantially.
Awaits forumers comments.
Thanks,
Ivan