Hi,
I'm trying to study the effects on efficiency (COP) if we consider to substitute the refrigerant in air conditioning units. Can anyone give me some guidelines? I didn't find yet any text related specificaly to this subject?
THANKS!!
Hi,
I'm following a specific installation and now its in testing phase. It's a big building and the system has balancing valves in the major distributing pipes foe each circuit. They need to be balanced according to the flow defined in the project. How must this be done?
Should all the...
Hi,
For example in a air treatment unit, i have a 2-way valve system in the how water pipes that are connected to this unit.
What is the best, install the 2-way valve in the inlet or outlet? Advantages and disadvantages?
This is logically a question that is applied also to any hot water...
Hi,
I would like to ask for your opinion in this: i have a tank with water that i need to heat. I have a circular coil inside it. I'm calculatin the area needed to transfer a certain amount of energy a a determined rate. Therefore i'm calculatin the Overall Heat Trasnfer rate, wich is baes on...
Hi,
I'm dealing with a dilema regarding my calculations for a plate heat exchanger.
Please take a look to the attached figure: HX_1. There we can see my calculations, where i have in my secondary circuit a temperature regime: 30ºC / 35ºC with a flowrate of 100m3/h. With this i need to define...
Hi,
I have a situation that i would like to have some comments about.
In some literature is mentioned the equation that is in the attachment, for the solar collector arrangement also in attached.
The solar array is parallel and the equation was generated through electrical resistance...
Hi,
In previous posts in the "Valves" section, i discussed the use of 2-way and 3-way control valves, for plate heat exchanger arregements.
One big question that occurred me was: when we use 2-way control valves, that are constantly modulating, how can we calculate the pressure loss to help in...
Hi,
Following my previous posts, i would like to ask for another question:
In the image that i attached, there is a balancing valve, that is commonly used. I don't know well why this is used.
For what i undestand, this is used to obtain in this circuit the same pressure drop as the heating...
Hi,
I'm making a big solar project. This project involves the heating of water tanks with solar energy until a maximum of 80 ºC. This water heats the consumption water flow through a heat exchanger. The cosumption water can exit at max. of 55ºC.
In solar simulation software, if we make the...
Hi,
I'm dealing with a project, where it was designed a heat transfer system between the boiler circuit and the process water, that has 2 heat exchangers instead of just 1. Of course that it has a simple circuit with a pump, to connect both heat exchangers.
I have searched in Holman and found...
Hi,
When coosing a 3-way valve, how can we decide between mixing or diverting valves? What are the reasons to choose each one. Wich applications are they mos suitable for?
Thanks!
Hi,
Can anyone explain to me, for example, in a plate heat exchanger system, where we want to control a exit temperature of a fluid, what are the reasons to choose between a 2 way or 3 way valve? (the fluid is water)
Thanks!
Hi,
I'm making a big solar project. This project involves the heating of water tanks with solar energy until a maximum of 80 ºC. This water heats the consumption water flow through a heat exchanger. The cosumption water can exit at max. of 55ºC.
In solar simulation software, if we make the...
Hi,
I have a question regarding the calculation of the heat transfer coefficient of a tank filled with hot water.
The calculation i know how is made, but my question is othe:
I have the hourly energy loss registered, so i know how much energy this tanks loses in an hour in a continuous function...
Hi,
I have a heat storage tank with 1 coil inside it, used to heat the water in it.
I have made my calculations, but stil i would like to ear other opinions.
How can i determine de coil efficiency?
Thanks
