Can anyone please size a heater battery for me? On a supply and extract heat recovery air handling unit. (50% efficient for heat recovery)
Outside temperature -2 degrees C
Room temp/Return air - 21 degrees C
Air voume - 1.3 m3/sec
Boiler flow and return - 80-60 degrees C.
I have been...
Ok thank you, so you potential for the 10m tap would be total head 52.5 - the water head and the 10ms??
So how would this be expressed in pascals as apposed to meters??!
The question i am relating it to is from the below. To calculate static pressure is this the potential pressure + atmospheric pressure = static?
We were also asked to tabulate our results with 4 columns: Static, Potential, Dynamic and Total pressures, and were told all totals should be the...
I am trying to understand how total pressure is calculated and how all system outlets will equal the same pressure (constant) within a system as bernoulli states.
To answer your question the static pressure increased as the potential increased, and to calculate the static pressure i just...
Right so can you take a look at the following for me:
(using 1000kg/m3 - density, 9.81m/s - gravity and 101325Pa Atmos)
Tap 1 - 5m of head
Potential (p.g.h) = 1000 x 9.81 x 5 = 49050Pa
Static = 49050Pa + 101325Pa Atmos
Dynamic (0.5pv2) = 49005Pa
Total for tap 1 = 199380
Tap...
Hello, I am studying fluid mechanics and we have worked on Bernoullis theory a lot over the past couple of years. I am really struggling to grasp the concept of the theory and what it is about. Bernoulli states that in a system the pressure will always be constant (hence Pt = Ps + Pv + Ph) at...
Homework Statement
Can anyone help with this particular question
Using a steam power plant that operates on a simple rankine cycle and has a net power output of 45MW. Steam enters the turbine at 70 bar and 500 degrees c and is cooled in the condenser at a pressure of 110kPa by running...
Hello again...i was wondering if you can help?
I am using enthalpy equations to try and find h1 and h2 to work out 'work and heat transfers' for water, for a piston type question.
I have calculated work done using: [w = -PDV]
To find the heat transfer i need to use: [Q=m.(h2-h1)]
i...
Hello again, i was wondering if you can help?
I am using enthalpy equations to try and find h1 and h2 to work out 'work and heat transfers' for water, for a piston type question.
I have calculated work done using: [w = -PDV]
To find the heat transfer i need to use: [Q=m.(h2-h1)]
i...
Thats great, but i have a few more questions if you have the time...Does that take into account the feed heater? and where does the water leaving the condenser come into it, as it enters the feed heater at 50 degrees C?
Its asking for the mass flow rate entering the feed heater? In your...
Yes that's no problem, i have steam tables that cover a whole range of enthalpys and entropys!...
So I find out wat the H's and S's are at 400 degrees C @ 40 bar, then i have for phase 1:
enthalpy, entropy, Temp and Pressure. Whats the next step. I always have an email address if its not...
Thank you.
You seem to have a very good understanding of what you are doing. Could you possible do the solutions for me?
I need the full solutions infront of me so i can work through them and learn it myself, with relevant equations used - or even have your best go?!?
I don't need this...
lalbatros,
You have been most helpful in your response. I probably didnt make myself clear enough in my original query.
On the steam turbine question, i have no problem drawing the schematic diagram, what i am really struggling with is the second part of the question and calculating the...
Homework Statement
Can anyone help on the below? I have been working on this for days and still can't find the solutions?!?
Homework Equations
Steam ar 40 bar and 400C enters the high pressure turbine of a steam power plant at a rate of 20kg/s and explands to a pressure of 3 bar at...