Solar Hot Water

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solar dhw - gas auxilary heater

For a solar DHW system, I understand that SAM only calculates savings in kWh. There is a macro to run using an auxiliary gas water heat that gives the savings in kWh. Converting to BTU or therms is easy enough. However, with the 2017 version on SAM, I'm seeing results that suggest an error. The scale of auxiliary gas water savings is very low.

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Plexiglas glazing and FRta


I want to simulate a solar thermal panel, but I do not have the FRta coefficient. My solar panel uses a Plexiglas glazing. What value should I use?

thank you

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Modeling of solar water heating with horizontal storage tank


The storage tank position is vertical in the solar water heating model. In some solar heater types like flat plate, the collector is coupled with the storage tank positioned horizontally. How can we model these types of systems in SAM?

Kind regards,

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Sizing the storage tank for a solar water heater system


I am sizing a solar water system and I am trying to find the perfect match between the collectors area and the storage volume. For large designs professionals seem to recommend that storage volume should always be greater than the site's average daily use. In regions with considerable sunlight, they also advise a 2 gallons increase in storage every square foot of net aperture area, in order to prevent the system for overheating during peak hours.

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Ikechukwu's picture
Nigerian weather data file

I need the Nigerian hourly weather data file.

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ahmed abdelrazik
solar water heater

dear sir,

how to choose type of collector used for solar hot water if it's used for a large system?
and if the collector known i need to know which one used?

best regards,
Ahmed Emadeldin

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CSP Linear Fresnel Direct steam

The inlet turbine Pressure and Field outlet temperature is changed by flow rate in LFR Direct steam system, I only want to make changing flow rate not but temperature and pressure. Is that possible?
and I want to know full detail of Thermal efficiency and collector optical efficiency.

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working fluid in solar water heating system

is it possible to change the fluid that work in the collectors in solar water heating system?
if yes ,how? i want to use a fluid with temperture dependent property.
thank you

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Solar water, residential - Rated system size incorretly calculated

SAM help says the field "Rated system size" is calculated using the formula:
Nameplate Capacity = Total Collector Area × FRta - FRUL × 30/1000

I input:
Total Collector Area = 8.968
FRta = 0.057
FRUL = 2.7

and calculate answer to be 0.430176.

SAM calculates -0.215232 and fails to run simulation. I get error messages. Please fix.
Thank you.

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Paul Gilman
Case File

Is there an example file for a biopower system?

If you want to see an example of a system in SAM, just create a case with the combination of performance model and financial model for the project you want to investigate. Here are step-by-step instructions to see an example of a biopower system; you can use the same technique to start modeling a photovoltaic, wind, or other type of system:

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