Pump Evaporator 1

[AO1958]

Hello,

I don't want to make you an odd question but I am facing to the concept of pump evaporator.

I'd like to understand a little more concerning the way of working of the system.

In detail, I would understand how to determine the enthalpic way to determine the capacity.
I would suppose that the enthalpic difference would be given from

(h out - h in)

where h out = latent/feed rate

my question would be:

obviously
capacity = mass flow * enthalpy difference

the question - hope not odd - is

is the mass flow equal feed rate times the standard mass flow it would have with a DX system ?

Many thanks

 

[willard3]

There is a language problem here or this is a send-up.

I'm pretty good with English and I have no idea what the question is.

 

[imok2]

The mass flow equals pounds of refrigerant per hour feeding through the system and the capacity is = to the pounds per hour (mass flow)times the btu per pound of the mass flow

 

[berkshire]

Are you asking about an evaporative cooler i.e. ( Swamp cooler.)?
Where the cooling rate is equal to the amount of water evaporated per hour?
B.E.

The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor

 

[MintJulep]

I think he means flooded evaporator.

Mass flow is mass flow. Don't times with anything.

 

[willard3]

Could be an ice rink, too.

Still think there is a language problem.

 

[AO1958]

Hello Everybody.

First of all my sincere apologizes for not being clear.
I thank all the people who answered.

Mr MintJulep, you are correct I meant a flooded evaporator.

The question I would like to understand is:
which is the correct way to calculate the performance of a flooded evaporator given the evaporating temperatures, secondary fluid inlet temperature and fluid flow ?

Apologizes for not being clear

 

[quark]

Do the energy balance and check with nameplate rating.

Refrigerant - m1[×][Δ]H, m1 is mass flowrate of the refrigerant, [Δ]H is the enthalpy difference of the refrigerant (closely, it is latent heat)

Water - m2[×]Cp[×][Δ]T, m2 is mass flowrate of water, Cp is specific heat and [Δ]T is temperature difference (in-out)

PS: Use consistent set of units.