Solar Thermal Vs Solar Photovoltaic Greenhouse Heating

Solar Thermal Vs Solar Photovoltaic Greenhouse Heating explained taking new pricing into account. I explore how a thermal dirt battery compares to the new pricing of lithium batteries I todays market as well as the idea of using an air heat pump for heating.

Chapters:
00:00 Introduction
01:41 ROI
03:44 Big vs Small Applications
04:36 Energy Storage
06:28 Insulation
08:43 Technology Futures
09:47 Math

[SimpleTek]

What kind of Solar heating system do you have or want?

[bulentaytekin]

Simple tek you are great guy which wakes up the greenhouse sector from their sleep.

[TheNightwalker]

A big advantage of thermal solar in my eyes is in certain applications where you just need reliable heat and have a small footprint to work with. Another thing is you could position some mirrors to reflect additional sunlight on the collector (pv would overheat) if you need to heat a pool/greenhouse/thermal battery/buffertank for hot water etc. i think a thermal collector can be quite useful. The con is always the piping. I could see a thermal battery with thermal solar to keep a stock water tank from freezing(might be cheaper with pv tough)

[markpnw]

Heat pump can also be used for A/C correct? My greenhouse becomes a shed in the summer because I can't get the temperature down and everything dies.

[slaplapdog]

I think you can do both.
Your northern wall could be built out of IBC totes, with removable insulation panels on the outside.
Your solar panels could be mounted on top of that wall, facing south of course.
Your heat pump water heater can be in the greenhouse.
During the day it wöuld remove heat from the air, and add that heat to the water storage.
At night the heat would naturally radiate back into the greenhouse.

A little bit crazier:
In summer, the insulation panels would be removed from the outside and used inside.
The heat pump water heater would still heat the water.
The heated water would shed heat into the night air, with help from a heater cores and fans, mounted outside the greenhouse.

Extra crazy idea.
Mount heat exchanger coils on the back of your PV panels, collect the heat and improve their performance.

Super stupid crazy idea:
Your PV panels are mounted on the inside of a hinged and insulated "lid", which opens to reveal the greenhouse glazing and PV .
Probably too heavy to actually work.

[chrisloving]

I live in northern Us so I use both. The pv runs ac and other power. Thermal heats a hot water pretank for my hot water usage and heats my house in the winter

[MarilynDYoder]

I would love to see a video on how to 'do the math'. For different systems, different sizes. You have a nice set of videos.

[larryw.]

Great topic! I'm dealing with this issue now. Building my green house and heat system.

[thevaultohio]

where does one get the insulated blankets to put over the greenhouse?

[leonardomorilla]

Simple tek! that is the name of this channel.... Hahaha I just love it! great channel!

[mimibergerac]

Just to put the info somewhere, if you mix abt 5 micron fine zinc dust 10% per weight in black paint you will increase heat collection by more than 17%.
(See study: Indoor and outdoor performance study of metallic zinc particles....)
Now if you use "Isonem thermal paint" (or similar, contains vacuum microspheres) on the inside of boards in your tube coil heat collector you should be able to again decrease loss and increase reflectivity back to the tubes significantly, not cheap 5 to 10 eur/$ per m2 (just found 3M glass microspheres you can mix in your paint yourself...cheaper) but better insulation cost even more. I will have to try it...

[goldblueberries]

Do you have any suggestions on where to purchase lithium batteries to store the energy from my solar?

[dagsmoko]

If PV is installed, then it's more economic to add a wind turbine because the electrical storage and load side already exists. Significant in areas like ours with plenty of wind but a lot of cloud in winter.

[johnblack]

are you planning on doing a video on making cheap aercrete pannels?

[smob]

People here are wondering about numbers so I did some math. A 55 Gallon drum of water heated 40C above ambient temperature has about 9kWh of energy in it, which is roughly a 12V battery with a 750 AH capacity.

Rough math:
Water has 4.1J/gC heat capacity
55 gallons of water weighs ~200kg

200Kg*40C*4.1J/gC ~=33MJ ~=9kWh

[tzenophile]

So this is why we're still waiting for your thermal dirt battery video!
PV + lithium ion + air-to-air heat pump for the win!

[lawrencebeeles]

Isn't there a voltaic Hazzard waste produce when they have to be remove or replaced

[ryuuguu]

Alternate crazy idea PV+heat pump + thermal battery. Run the heat pump during the day to store thermal energy into a thermal battery during the day then release the heat at night. PV is cheap and last 20 years.Thermal battery is cheap and long lasting. A big problem with thermal batteries is they inefficient when you need to electricity out of them but efficient if you want het. if the battery is below the level of the green house (in ground?) then you may not need much of pump to move the energy from the battery since since hot water/air rises.

[lancewilson]

Hey buddy I'm curious! If u have a wood boiler why don't u store that heat in an earth battery so that u don't have to run the boiler all the time?

[oaklejant]

My experience. Having thermal panels still installed since 21 years and PV panels installed since less than 1 year. Nowadays, I would only choose PV panels. Why? The thermal panels produce more energy when less hot water is needed (summer) and they only produce hot water. However, the PV panels can be used to operate any kind of electric device (heat, cold, ...), i.e. in summer they can produce cold (with an AC) or reduce the electricity bill, ...