# Solar Hot Water

2 posts / 0 new
dd_patel
how qloss is positive

Dear Paul,
I am working on SWHS. I have few confusions while simulat.
a) How come Qloss is +ve although Tamb is greater than Ttank?
b) Does -ve Qloss represent Qgain from atmosphere?
c) How Quseful is zero though there is temperature difference between Tout and Tmains?

I am attaching two images of my simulation result.

2 posts / 0 new
solar hot water system

Hi Support people,

Hope you're doing great. I wanted to know in the solar hot water system in SAM is it possible to project the performance after the first year. I would like to do a analysis for 5 years including the degradation process. Is it possible for analysing after first year?

thank you,

2 posts / 0 new
Incidence angle modifier

Hi Support People,

While calculating the Incidence angle modifier I'm used to having a matrix of values for longitudinal and transversal IAM for various incidence angle combinations for tubular collectors.

for eg

Dir. | 0° | 15° | 30° | 45° | 60° | 75° | 90° |
-------------------------------------------------------------
Trans. IAM | 1.00 | 1.01 | 1.03 | 1.05 | 1.04 | 1.02 | 0.00 |
Long. IAM | 1.00 | 1.00 | 0.98 | 0.96 | 0.90 | 0.71 | 0.00 |

2 posts / 0 new
valquiriafernandes
Heat Pump Module

I want to simulate different combinations of water heating systems, coupled with solar heating. For this, I need an auxiliary tank connected to a heat pump, for which I would insert the performance parameters from the pump's manufacturer. Is there a module for a heat pump already developed for SAM?

2 posts / 0 new
nk
solar hot water

while designing solar hot water, total system flow rate as mentioned in help is the flow rate for the collector side. so how is the tank side flow rate taken care of? and also the pump is mentioned generally. the pump refers to the collector side or tank side? Also, in cases where load exchanges heat through exchanger and actually the tank side water is not used up ie only the energy is used up. so how then is tank temperature calculation affected? thanks in advance.

4 posts / 0 new
rhasselman
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.

2 posts / 0 new
maxime101
Plexiglas glazing and FRta

Hello,

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

2 posts / 0 new
mecheng
Modeling of solar water heating with horizontal storage tank

Hi,

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,
Ibrahim

2 posts / 0 new
Ronan
Sizing the storage tank for a solar water heater system

Hello,

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.

3 posts / 0 new
Ikechukwu
Nigerian weather data file

I need the Nigerian hourly weather data file.

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