DIY earth tube cooling and heating project: profitability & measures/experiment
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- เผยแพร่เมื่อ 16 ก.ย. 2024
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This videos is the third part of a set of videos on a geothermal ventilation system done with 2 earth tubes (ground coupled heat exchanger). This specific video is focusing on the air temperature measurements during 2015 and on energy savings calucations for both cooling and pre heating mode.
Hi! Thank you for such great project and especially for real temp logs. This is very useful video and job.
Thank you for sharing. It was very informative.
Hi Nrlog
Just found your work here, I've been thinking this same set up for many years but havent had the property to install.try it as yet, may l ask a question, have you done or know anyone that has completed a similar system under a concrete slab and also recirculating the tempered air back through the system with of coarse a percentage of purge, your results may prove better or worst maybe ?
Love that you went to the trouble to do this by the way, it looks a fair bit of work, to add the tech data generated is gold man, well done !!!
Regards
Wayne Neylan - Deluxair Mechanical - Australia
Have you measured the level of dehumidification effect in summer?
I may have missed it....
What was the different in inside summer temperature with this system? I thought I heard 15° of temperature reduction but I'd like to confirm. Ty
Une question. Pkoi ne pas inshaller l'extracteur d'air au niveau même de l'entrée d'air des cables dans la maison au lieu de compter sur un extracteur placé au niveau du toit?
What are the breakeven months? Total cost / ave savings per month?
Really interesting video. Thanks for posting
Comment est ce que lair sortant est-il chauffé en hiver?
From my understanding, it seems you are saving approx. 50 euros per year when heating, and 40 euros per year when cooling, for a total of about 90 euros per year?
True. Energy is not yet too expensive!
@@nrlog3682 Not yet expensive, yes.
I'm thinking on installing a similar sytem, but with closed loop for summer cooling. Your temp data shows it is futile, due to the incoming air is still very warm. However, the heat extracton (15°C) is rather promising! If I can cool down the air to 13°C it would be worth doing.
In cooling mode, the air should drop to the ground (mass) temperature but you dont seem to have installed sensors to measure the ground temperature for some reason. If your fan is moving 700m3 per hour (approx 412cfm) you dont have nearly enough airflow to get the most from the installation.
Hello,
The inertia of hundreds ofm3 of ground is so big compared to the thermal power we talk about here, that i think this is possible to neglect. In real life i have seen after several days with the fanr ON a plus one degree on the air entrance which is probably linked to this ground temp heating.
the reason for limiting the fan to 700m3/h was that it reaches the limit of2m/s on the inside tubes of the house which begins to be noisy. important to consider!
Regards
I use my system in a greenhouse (closed circuit) so noise isnt so much of an issue but i understand it could be problematic in a domestic situation ;) Folks imagine tubing buried in the ground has access to limitless mass when in reality it is only a foot or so around the tubing (heat moves very slowly in the ground). If you have enough sensors in the ground it becomes very clear that this is the case ;) My observations show the mass temperature peaks approx 5 hours after the peak greenhouse temperature and approx 2 hours after the heating period ends. Heating in this case being cooling the greenhouse and storing the excess heat in the mass.
I live in Arizona. I'm planning a greenhouse (48ft x 16ft). I'm trying to decide if I should use this style or a labyrinth under the greenhouse and what size (and length) tubes should I use?
Hi, are you using recuperator with this system? meaning do you recover any of the heat/cool extracted from the house? Do you need to clean the pipes below the ground ever? And last question, what additional heat source do you use in the winter? Thanks :)
Hi. actually i am not using such a recuperator but it is totally
possible to add it to get a very good air temperature in winter. In
summer you would need to add a bypass if so. Regarding the pipes, yes
I can clean them in the future (just by water going down
to the lowest point). I use an air to water heatpump af the main heat
source.
How much water does the installation produces per year?
Honestly here nearly nothing. But in another wetter country ??
what is the square footage of the home?
Actually around 150m2. But i focus on some rooms the effect.
@@nrlog3682 150m2 both levels total? or each level?
Great job! How can I Contact you?
My name is David O’Keeffe and I live near Killarney in Ireland.
These were brilliant videos and I found them very informative.
I am beginning the building of a new house for myself at the moment. I will be having a mechanical heat recovery system to ventilate the house as it will be quite well insulated. This system would typically draw the air in from a vent located at the back / side of the house.
However I was considering having this piped underground and having it buried deep and rising again approx. 80-120 feet away close to my shed. I was thinking this could pre-heat the air in the winter for the cold days (thus reducing my heating demand) and pre-cool the air in the winter and act as a basic (free) cooling system.
My system will be filtered anyway with the MVHR. Do you think this idea has merit? It sounds brilliant to me but I haven’t heard of anyone in Ireland using it. Here is some info on my climate.
weather-and-climate.com/average-monthly-Rainfall-Temperature-Sunshine,killarney,Ireland
I am afraid teh humid wet climate in Ireland will cause issues.
What do you think ?
Any info would be greatly appreciated.
Hi, can regular piping work as well?
Hello. No, it is highly recommended to NOT use PVC or plastic tubes due to Volatile organic compounds (VOCs)
This video is not helpful. But I liked the others.