points by westurner 3 years ago

Passive solar building design : https://en.wikipedia.org/wiki/Passive_solar_building_design#...

Low-energy house: https://en.wikipedia.org/wiki/Low-energy_house

List of low-energy building techniques: https://en.wikipedia.org/wiki/List_of_low-energy_building_te...

/? Passive solar home (tbm=isch image search) https://www.google.com/search?q=passive+solar+home&tbm=isch

/? Passive solar house: https://youtube.com/results?search_query=passive+solar+house

/? passive solar house: https://www.pinterest.com/search/pins/?q=passive%20solar%20h...

(Edit)

Maximum solar energy is on the equatorial side of the house.

Full-sun plants prefer maximum solar energy.

10ft (3m) underground it's about 75°F (24°C) all year. Geothermal systems leverage this. (Passive) Walipini greenhouses are partially or fully underground or in a hillside, but must also manage groundwater seepage and flooding; e.g. with a DC solar sump pump and/or drainage channels filled with rock.

Passive solar greenhouses (especially in China and now Canada) have a natural or mounded earthen wall thermal mass on one side, and they lower wool blankets over the upside-down wing airfoil -like transparent side at night and when it's too warm (with a ~4HP motor).

TIL an aquarium heater can heat a tank of water working as a thermal mass in a geodesic growing dome; which can be partially-buried or half-walled with preformed hempcrete block.

Round structures are typically more resilient to wind:

Shear stress > Beam shear: https://en.wikipedia.org/wiki/Shear_stress

Deformation (physics) > Strain > Shear strain: https://en.wikipedia.org/wiki/Deformation_(physics)#Shear_st...

GH topic: finite-element-analysis https://github.com/topics/finite-element-analysis

GH topic: structural-analysis: https://github.com/topics/structural-engineering https://github.com/topics/structural-analysis

What open source software is there for passive home design and zero-energy home design?

Round house: https://www.pinterest.com/search/pins/?q=round%20house

The shearing force due to wind on structures with corners (and passive rooflines) causes racking and compromise of structural integrity; round homes apparently fare best in hurricanes.

westurner 3 years ago

Walipini passive solar green houses: https://en.wikipedia.org/wiki/Walipini

Earthship passive solar homes: https://en.wikipedia.org/wiki/Earthship

Underground living: https://en.wikipedia.org/wiki/Underground_living

Root cellar passive refrigeration: https://en.wikipedia.org/wiki/Root_cellar

Ground source heat pump (Geothermal heat pump) https://en.wikipedia.org/wiki/Ground_source_heat_pump

Solar-assisted heat pump: https://en.wikipedia.org/wiki/Solar-assisted_heat_pump

(Geothermal Power = Geothermal Electricity) != (Geothermal Heating)

Geothermal power: https://en.wikipedia.org/wiki/Geothermal_power

Geothermal Heating is so old, https://en.wikipedia.org/wiki/Geothermal_heating

...

AC-to-DC (rectifier; GaNprime, GaN) and DC-to-AC (inverter) are inefficient conversions: it wastes electricity as heat.

Residential and Commercial AC electrical systems have a GFCI ground loop (for the ground pin on standard AC adapters)

  WAV: Watts = Amps * Volts

  # USB power specs (DC)
    7.5w = 1.5amp * 5volts  # USB
   15w   = 3a * 5v  # USB-C
  100w   = 5a * 20v # USB-C PD
  240w   = 5a * 48v # USB-C PD 3.1

  # 110v/120v AC: 15amp; Standard  Residential AC in North America: 
  1500w = 15a * 100v  # Microwave oven
  1650w = 15a * 110v
  1440w = 12a * 120v  # AC EV charger

  # 110/120 AC: 20amp 
  2400w = 20a * 120v  # Level 1 EV charger

  # 240v AC plug: Dryer, Oven, Stove, EV
   4800w = 20a * 240v
   7200w = 30a * 240v # Public charging station
   9600w = 40a * 240v # Level 2 EV charget
  14400w = 60a * 240v 

   120000w =  300a *  400v # Supercharger v2
   120kW   =  300a *  400v 
  1000000w = 1000a * 1000v # Megacharger
  1000kW   = 1000a * 1000v
  1MW      = 1000a * 1000v

USB > Power related standards: https://en.wikipedia.org/wiki/USB#Power-related_standards

Charging station > Charging time > charger specs table: https://en.wikipedia.org/wiki/Charging_station#Charging_time

(Trifuel) generators do not have catalytic converters.

Wood stoves must be sufficiently efficient; and can be made so with a catalytic combustor or a returning apparatus (and/or thermoelectrics to convert heat to electricity).

/? Catalytic combustor (wood stove) https://www.google.com/search?q=%22catalytic+combustor%22

Wood-burning stove > Safety and pollution considerations > US pollution control requirements: https://en.wikipedia.org/wiki/Wood-burning_stove#US_pollutio...

Gravitational potential energy is less lossy than CAES Compressed Air Energy Storage is less lossy than thermal salt is less lossy than chemical batteries.

  • cwkoss 3 years ago

    'Pain mound' low tech compost driven water heaters are neat too

    • westurner 3 years ago

      For which types of compost is there risk of spontaneous combustion?

      What design safety features are necessary for a heat pump to efficiently extract the heat of a wood boiler or a compost pile? Is it safe to locate them next to a heat pump or a dwelling or a thermoelectric boiler?

  • londons_explore 3 years ago

    This is a pile of vaguely relevant facts...

    I think in my HN comments I'd prefer a couple of facts and a conclusion, with citations for more detail.

    • westurner 3 years ago

      What do you have for low energy, zero energy, passive solar homes?

      Buy-all-sell-all says you can't use your solar to power your duct fans even when the grid is down?

      Write me a ScholarlyArticle.