I'm desparate to get hold of the ASHRAE Duct Fitting Database. I live in South Africa, and do not have enough time to wait for the shipping and postal service. Is there anywhere on the internet where I can purchase / download / view this document in .PDF or similar? It is only available on CD...
HVAC68, herewith the answers to the questions that you have asked.
1) The 25 - 30m is horizontal
2) Yes
3) There is no nett vertical lift
4) Thanks, I would consult the supplier on the capacity drop
5) Fresh air is provided by means of a fresh air supply duct. The offices are small, in...
Did not realize that one can damage the equipment by using longer pipes than specified. The 5kW units can tolerate pipe lengths of up to 35m, so I'll over-size all units to at least 5 kW. The client did unfortunately specify that a VRV system is not an option as this would complicate...
I am new to HVAC design and need help on the following issue:
I have specified a number of house hold Split Units for an office complex. The split units are relatively small, most of them providing 3.2 kW of cooling. I need to run the piping for 25 - 30m, as the only available space for the...
Thanks guys. I'm more interested general guidelines from guys that know large compressors.
Let's start from what I mean with compressor efficiency, and how I understand the whole compression process.
A) There is a loss due to the non-isothermal nature of the compression process. This is...
Thanks, I didn't state the question all that clear, so let me try again.
I have to use a theoretical approach in order to determine the compressor efficiency, thus I cannot rely only on supplier information. I want to know if it is possible to determine the overall compressor efficiency based...
I need to estimate an efficiency of a centrifugal pump, but do not have any specifications. This is what I know:
Single stage centrifugal pump
Static head: 100m
Motor power: 200 kW
Water quality: Poor. Water is pumped from the bottom of a gold mine. It is not slurry, but it does...
I need to calculate the energy use of a large centrifugal compressor installation at a gold mine. I do not have any curves, nor can I make any measurements.
I have the following specs:
Inlet pressure: 85 kPa
Outlet pressure: 550 kPa
# of stages: 4
mass flow: 25 kg/s
Inlet temp: 18 C...
