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Hi, I have a doubt related to PV pannels structures, to be installed near the sea. I want to know witch material is more resistant to corrosive environment: aluminium or galvanized steel? Is there any quick reference or a technical document, where i can find this and more about coatings in...

hi, I have an installation where the pumps avaiable in the market for that purpouse do not reach the head that i need to overcome the circuit pressure loss. Therefore, i wonder if i could install another pump after this 1st one. Do you think that i need to leave some space between them or even...

Hi, I'm facing the following problem: in the project, i've calculated the pressure drop along a closed circuit. The calculations gave me aprox. 3,5 mH2O of pressure drop. This was calculated for a optimal flow of 240 lt/h. After the installation was made, the max flow that the pump was able to...

Hi, Can anyone confirm this to me please. Does a check valve has a different had loss value, if it's installed in a vertical or horizontal pipe? Thanks

Hi, In hydrostatics everyone learned that P=F/A p=Pressure F=force A=area From this relation we can determine for a cilinder(for example): P=(m x g)/A = (mv x V x g)/A = (mv x A x h x g)/A = mv x h x g m=mass (kg) mv=specific heigth (kg/m3) V=volume h=height g=gravity acceleration So, from...

Hi, I have a question that everyone answers me in a different way, and i hope to clarify it with everyone. What happens if a pump is working and pumping water, and we close a gate valve 1 meter ahead the pump? My first answer was that that pump would start to block and in the limit burn the...

Hi, This question was already debated too much times in thsi forum, but i still doesn't understand one thing that questions all that i've learned until now. In series pipes, everyone knows that to determine the head loss we have to sum all the head losses of each consumer. But in parallel...

Hi, I have a complicated question to make. I have a solar system that stops when the solar collector reaches 100 ºC. At this moment, there is 40m of copper pipe filled with water that isn't circulating. My problem is that from this moment ahead, the solar pannels continue to transfer energy to...

I there, Does anyone knows how can i calculate the number of solar panels that i need? what kind of data do i need to perform this claculation. Thanks for the attention!

Hi, It was told me in the Piping forum, to post my question here so that someone may see it and answer... I'm calculating a superheater, and i was faced with the following problem. when we calculate the external (gas) head loss, we have the following expression: dP=2*f*G^2*N/density In this...

Hi, I'm calculating a superheater, and i was faced with the following problem. when we calculate the external (gas) head loss, we have the following expression: dP=2*f*G^2*N/density In this equation, we have the value G, that represents: "mass velocity at minimum flow area" (extracted from...

Hi, I would like if anyone has a table with the common range of values for the boiler efficiencies for different fuels: Natural Gas, Propane, Butane, Biomass(wood chips), coal, fueloil. thank you!

Hi, In my calculations, and assuming that i have biomass with humidity of 40%, i've calculated the air/fuel ratio = 0,7 kgair/kgfuel. Can anyone confirm this value as correct or approximate? Thanks

Hi, I need to select a pipe to work at -30 ºC and 20 bar, and i'm inclined to select a stainless steel, but i can't find a data sheet to select it. The ideal thing is to find some data sheet that follos ASME Code. So does anyone knows any data sheet to select the pipe material and thickness...

Hi, i have another question related to the fact of founding 2 different values, for the same thing, if we use 2 different methods. PROBLEM: I want to know the fuel (Natural Gas) mass flowrate with the following known values: Boiler power (P): 6500 kW Boiler efficiency (E): 87,8% Natural gas...

Hi, I have an economizer wich saves aprox. 200kW of heat power. I want to estimate the gas savings. I have LHV of the gas = 37900 kJ/kg, and the aprox. gas consumption = 312 kg/h of the boiler. This leads me to: LHV*MassFlow=11824800 kJ/h = 3284.7 kW. How can i relate the economizer power to...

Hi, I'm calculating the flue gas dewpoint of a gas boiler. I'm finding some problems, because we know that the dewpoint temperature is the saturatrion temperature at water partial pressure. My problem is that the partial pressure is function of the total pressure, wich in the most cases, we...