Dear Mohammed, it makes sense to be more precise in questions since most of readers are not narrow specialists in your field. For example, I am an economist who also knows some physics but not the details of technology.

If I understood your not very precise question correctly, you deal with ecological building (probably in area with high temperature, since you do not talk about heating - typical case for EU) where cooling of certain power (TR- what unit is that? How much in kW?)

You probably should start from physics and technical characteristics of solar collectors (do you mean photo-voltaics or other?) Just search in internet for some articles like that: http://www.em.avnet.com/en-us/design/marketsolutions/Documents/solar/featuredarticle-fundamentals-article-june2012.pdf

They have certain peak capacity of energy production that depends not only on technology but also on climate in the area of application. They also have profile of production. Then you calculate balance: how much energy one panel will produce in average weather day in your area. Then find your required consumption. Later account for potential losses.

I must say here in a clear terms that your posted question is yet-to-be cleared to me. kindly re-frame your question for better understanding

Hello,

Text me your mail address please. I have a ppt that could help you. 

Regards.

The amount of energy produced by an array of any given size is determined by multiple factors and is usually analyzed by a computer model rather than an equation due to the complexity and interaction of: Weather, insolation (energy from the sun), etc at any given location.  There are a couple different free-to-use modeling programs.  I would reccomend looking at SAM, developed by the US National Renewable Energy Laboratory (NREL) to get an idea of how much PV you will need to meet certain loads and at what time of the year those loads can be expected to be met.

http://en.openei.org/wiki/System_Advisor_Model_(SAM)

Hopefully that is helpful!

Sir I am simulating a building whose cooling load is 394kW. I am using Double effect absorption chiller for this purpose. To get 394kW energy from the chiller, I need 325kW from the solar collectors. I need to use evacuated tube collectors for this purpose. I want to know the area of solar collectors for this purpose. I hope you get my point now.

Dear Mohammad

The solar constant is about 1367 W/m2, and at Earth's surface when the Sun is at the zenith is about 1050 W/m2. The amount of solar energy that we can receive is defer to the location of your building, the weather situation, the season and etc.

There are a lot of equations to estimate the solar irradiance. But if you want a quick answer this should help you: The average of solar radiation at Pakistan is (5 kWh/m2/day) that is higher than the world average (3.61 kWh/m2/day).

I think you need 325 kWh/day from the solar collectors. If we assume that the electrical PV efficiency is 20% so you need about 325 m2 of PV panels.

Thank you Sir

You're welcome.

Area of collector = (mcpDT)/ (I * Efficiency)

Dear Muhammad

The area of the solar collector depends strongly on the location and the operating conditions (Average temperature of the working fluid, Tav). You can use the following energy balance equation to calculate the area:

Gt * A * Efficiency= m * Cp * (Tout-Tin)

Gt: irradiance, A: solar collector area, Efficiency: solar collector Efficiency

m: fluid mass flow rate, Cp: fluid specific heat, T:temperatures at inlet & outlet

The Efficiency of the solar collector can be calculated from the characteristic curve equation provided by the manufacturer in the form:

Efficiency=a0 - a1*(Tm-Tamb)/Gt - a2*(Tm-Tamb)^2/Gt

Tm is the average temp between inlet and outlet, Tamb: ambient temp

a0, a1 & a2 are constants provided by the manufacturer and you can get them for the evacuated tube collector from any manufacturer's wepage or a published article.

I hope this may help you

Thank you Sir. This is exactly I was looking for.

According to European standard the specific area range is from 3-10 m2/kWcooling.

Dear Muhammad

I recommend you to check your results with other STWH calculating softwares.

For instance, http://kalkener.com/en/ calculates the main components of this type of facilities, its annual energy production and key performance and profitable indicators (Net Present Value -NPV- and Internal Rate of Return -IRR-), once the user has introduced the hot water energy consumption (in a daily, weekly and monthly basis),  the location of the installation (through latitude and longitude) and the rest of variables (Supplied water average temperature, shadows, etc.).

This online software has been included into the following specialized websites (herein you will find attached their links):

• BUILD-UP: The European portal for energy efficiency in buildings

and

• The International Building Performance Simulation Association (IBPSA) IBPSA-USA

Regards,

Jorge

http://kalkener.com/en/

http://www.buildup.eu/es/node/48077

http://www.buildingenergysoftwaretools.com/software/kalkener-solar-thermal-water-heating-systems-online-simulation-software

Thank you very much sir