Jiazi
07-06-2013, 03:24 PM
Hi, all
I am new and reading some books by myself, but something is difficult to understand, casually, I found this forum and people here are very kind.:)
1045510456
About the ASHRAE 2010(SI), chaper1 (halocarbon refrigeration systems), it gives some tables, but I don’t understand how the data calculated ou:confused:t:
1. Tables 3 and Table 4 both list suction line capacities under -40 and -30 SST, but why the corresponding Δp are different(marked in red), for example 196 in Table3 while 121 in Table 4 at SST=-40 ℃?
The pressure loss Δt=0.04k/m, I calculate the correspondingΔp, for example, =saturated pressure(@-40℃)- saturated pressure(@-40.04℃), right?
2. In the Table3, the discharge lines Δt=0.02k/m, but where does Δp=74.90 come from? And also liquid linesΔp=749?
3. How to calculate the capacities for suction, discharge, and liquid lines?
Best regards and thanks
I am new and reading some books by myself, but something is difficult to understand, casually, I found this forum and people here are very kind.:)
1045510456
About the ASHRAE 2010(SI), chaper1 (halocarbon refrigeration systems), it gives some tables, but I don’t understand how the data calculated ou:confused:t:
1. Tables 3 and Table 4 both list suction line capacities under -40 and -30 SST, but why the corresponding Δp are different(marked in red), for example 196 in Table3 while 121 in Table 4 at SST=-40 ℃?
The pressure loss Δt=0.04k/m, I calculate the correspondingΔp, for example, =saturated pressure(@-40℃)- saturated pressure(@-40.04℃), right?
2. In the Table3, the discharge lines Δt=0.02k/m, but where does Δp=74.90 come from? And also liquid linesΔp=749?
3. How to calculate the capacities for suction, discharge, and liquid lines?
Best regards and thanks