How much grout will I need to fill a cinder block wall 130' x 8' using 8x8x16 blocks? Should I use PVC or EMT for electrical conduit? How to pre-plumb?
I am building this home in Dunlap, TN - 30 miles NW of Chattanooga. My desire is to cut electrical costs as much as possible via passive solar heating.We need more details----where are you? What does local code allow for electrical conduit?
Is this an outside wall? Will freezing be a problem for plumbing?
What plumbing?
Thanks Dick, I am looking for ballpark figures at this point. You are correct in assuming the wall is for thermal mass. Can I may my own double paned glass windows? 3/4 " barrier? How far should the glass be distanced from the trombe wall. Should I place upper and lower vents in the wall?For the grout, figure on using about 50% of the volume of the wall. That is based on a typical 8x8x16 block and special units may require a somewhat different amount. Since it is a Trombe Wall, it is probably not structural and the goal is just to get as much mass into the wall.
Dick
How would I incorporate the water into cinder blocks as a storage medium? I am planning on doing all the construction myself. Pouring cement into the cinder blocks (dry-stack construction) as I work my way up seemed the simplest and most efficient means of thermal mass storage.Have you given much thought to other passive heating storage systems, specifically water? Or are you set on T.W.'s, though they don't have much for overcast days storage.....
Gary
I have been worried about the humidity since I was warned it was a potential problem. Silly me, I have not considered ventilation for this small home ( 800 sq. ft. ). In addition to the passive thermal walls, I plan on using a small pot bellied wood stove in extreme cold. In the summer, I plan on using only window fans -no air conditioning at all. I plan on east and west wall windows for cross ventilation in the summer. I suppose in the cold months, the house will be closed tightly.Chief -
You can use sand in the cores to increase the thermal mass of the wall. The resulting wall weight/density will be slightly less, but still far superior to a lightweight wall that offers the benefit of the sun. They also do offer thermal benefits on cloudy days and even at night (thermal inertia). You may want to find a way to "dump" the excess heat when it is not needed.
I have never seen a Trombe Wall that created or was involved in a moisture problem. The ventilation and humidity inside the house will control the humidity since it is steady state situation as opposed to what happens in a lightweight home.
concrete is a great modulator of both heat and humidity. If the home is opened up in humid season, the concrete can slowly absorb some of the humidity and if the home is too dry in the winter, it can give off limited moisture for a relatively short period of time. - That is why HVAC engineers can downsize the heating and air conditioning systems and improve the livability.
Dick
Thanks a million GBR - this info should keep me busy the next few days. I really appreciate your time and input! I will post again as new questions ariseIn a few years, I plan to buy/remodel/addition a small house-800sq.ft. enlarging it to 1000sq.ft. One level, two bedroom, 1&1/2 bath retirement home. I researched TW's but the 7-10 no-sun days (or longer) around here discouraged me. I want passive solar, with back-up electric heaters, solar water pre-heating, and vestibules at back/front door to keep the heat inside the cellulosed double-walls. Here are some of my study sites; http://www.greenbuildingadvisor.com/book/export/html/494
http://www.energysavers.gov/your_home/space_heating_cooling/index.cfm/mytopic=12480
http://soe.rutgers.edu/files/Arch.pdf
http://www.energysavers.gov/your_home/water_heating/index.cfm/mytopic=12850
http://www.builditsolar.com/Projects/WaterHeating/water_heating.htm
http://www.builditsolar.com/Projects/SpaceHeating/Space_Heating.htm
Some of the ones I am going with: http://www.n3fjp.com/solar/solarhotair.htm
http://www.ibiblio.org/london/renewable-energy/solar/Nick.Pine/msg00026.html
http://www.ibiblio.org/london/renewable-energy/solar/Nick.Pine/msg00025.html
http://www.ibiblio.org/london/renewable-energy/solar/Nick.Pine/msg00011.html
A drain-back solar or a pre-heater finned-line to a tank incorporated in the solar closets, and an ERV rather than a HRV which dries the air out. You may also want to check out 2’ of sand under the slab with passive air heating ducts run through them for longer term than a TW. With a wood stove, the TW may all you need.
Gary