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Last edited: 18 March 2024      

Joel Goodman is a research architect living in Wisconsin, USA. After a few solar cooking experiences in the 1970-80s, he began studies of small-mid size solar kitchens using built-in fixed ovens (2003), inserted solar box cookers (2005), and augmented with building size nonimaging fixed reflector troughs with adjustable end reflectors (2007)(2009).

Because of outgassing concerns from materials (insulation, glues, etc.) inside of augmented box cookers, and box cookers take up space in kitchens, mid-size kitchen studies began with thru-wall greenhouse type (HotPot, etc.) ovens (2006), and recently for small houses with thru-wall greenhouse type ovens combined with improved cook stoves, revealing house plan and solar access planning requirements. Additional studies are for exterior furniture fixed reflectors augmenting box cookers.

Square tube beam for PV pergolas June 22 2007

PV pergolas Square tube beam and natural round wood - www.PVO-Pergolas.com

HotPots above involutes-one-sided CPC 6-23-07

Hotpot-type cookers with involute reflectors and wall supported one sided cpc non-imaging reflector

Thru-wall four-panel schematic patterns
Solar Cooker Cart with Greenhouse Type Ovens

Solar Cooker Cart with Greenhouse Type Ovens

Glass glued to CSEB June 2008

Glass glued to compressed stabilized earth block (CSEB) with thin amounts of silicone sealant on glass and CSEB.

Joel Goodman - Study model - Greenhouse type oven in lower nonimaging reflector frame

Study model - Greenhouse type oven in lower nonimaging reflector frame


News

  • NEW: March 2024: Removable extra reflector for early, late day sun angles


  • NEW: February 2024: TRW Funnel 3-CPC part design, molds, and prototype manufacturing project
JG 1, 2-29-24
JG 2, 2-29-24


  • NEW: February 2024: TRW Funnel 3-CPC part design, molds, and prototype manufacturing project
JG 1, 2-28-24
JG 2, 2-28 -24


  • NEW: February 2024: Clay molded corner pieces
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  • January 2024: Mirrored ceramic floor tiles
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  • January 2024:TRW molds test molding
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  • January 2024: Thru-Reflector-Wall (TRW) Nonimaging concentrator solar kitchen studies
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  • December 2023: Thru-Reflector-Wall (TRW) Nonimaging concentrator solar kitchen studies
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  • December 2023: TRW solar cooker kitchens--5-piece funnel with 2 molds studies
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December 2023: TRW Nonimaging concentrator solar kitchen studies

J, Goodman 1, 12-4-23
J, Goodman 2, 12-4-23


November 2023: TRW Building-Integrated-CPC commercial Solar dryer concept study

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October 2023: Precast concrete and ferrocement TRW 3-sided CPC funnels for Tropics

October 2023: Formed metal

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August 2023: TRW Split bamboo rectangular frame + polycarbonate film unsealed cover

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July 2023: TRW nonimaging concentrator solar kitchen studies

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July 2023: TRW nonimaging concentrator solar kitchen studies

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July 2023: TRW three-CPC funnel test stand reflector

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  • June 2023: TRW CPC-Type Funnel Studies
Joel Goodman, 6-22-23


Prof Rapaka with team, 5-31-23

E. Vijayakrishna Rapaka and his research team

  • May 2023: TRW small low-cost masonry house in the tropics studies - A TRW configuration favored at this time for small masonry house studies is an ordinary-CPC type funnel-box with horizontal inlet aperture, flat trapezoidal kitchen wall reflector and vertical E/W portable reflector. Cookware options in the funnel-box are placed on a ‘square’ reflector plate that defines the cookware door width and associated lintel. An option is a temporary transparent horizontal unsealed cover glazing on the funnel box inlet. A TRW with a large cookware door would coincide with a main TRW characteristic that is: large, heavy or cumbersome cookware too inconvenient to carry outside to a solar cooker in bright sunlight may be used by cooks inside a TRW kitchen. Cookware options that fit thru the door and fit on a ‘square’ reflector plate include: a large diameter cylindrical cookpot, multiple smaller cookpots, and a cubic black metal oven. Aluminum or flat glass mirror CPC-type reflectors are in the funnel-box. Flat glass mirror reflector tiles forming a trapezoidal shape on the kitchen wall above the cookware door are being considered. The incline of the trapezoidal reflector is influenced by the latitude location. Construction materials and methods could influence cookware door size and TRW funnel-box shape e.g., Compressed Stabilized Earth Blocks (CSEB) standard shapes and sizes.
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  • May 2023: CPC shape funnel-box filler-blocks for TRW solar cooker kitchens
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  • May 2023: TRW Kitchen Wall Trapezoidal Reflector shape studies
TRW Goodman, 5-1-23


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  • March 2023: TRW study with up to 21- 33 Qt cook pots - A TRW solar kitchen study is with up to 21- 33 Qt cookpots, part of a constructional study to size the cookware door and funnel-box and glass cover-glazing, etc. Comparative studies for a tracking parabolic dish solar cooker with a less than 5-liter pot outside with a TRW solar kitchen 21-33 Qt pot should include: time to cook, amount of food (e.g., rice and beans) and time and work to handle the cookware.


  • February 2023: TRW Feb 13, 2023 masonry vertical mirror wall studies
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  • February 2023: TRW Feb 11, 2023 Thru-Reflector-Wall nonimaging concentrator solar kitchen studies
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  • February 2023: Building interior cookers and nonimaging reflectors (BICNR) for high latitude locations
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  • February 2023: TRW Feb 6, 2023 prefabricated funnel-box with ordinary CPC-type reflectors
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  • February 2023: Latitude locations suitable for TRW vertical kitchen wall fixed reflectors (+/- 23.5 degrees)
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  • February 2023: Thru-Reflector-Wall (TRW) Nonimaging concentrator solar kitchen studies
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  • January 2023: Thru-Reflector-Wall (TRW) Nonimaging concentrator solar kitchen studies
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  • January 2023: A TRW ferrocement funnel box size is related to the largest cookpot diameter that can pass thru the cookware door. The vertical box height (Hb) is coordinated with masonry courses of CSEB
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  • January 2023: TRW Kitchen Building study - Equator zone with seismic hazard: Seismic hazard TRW building construction would have higher costs with reinforced concrete frames. TRW solar cooker-kitchens nonimaging concentrator demonstration building preliminary studies in progress include: non-seismic hazard and seismic hazard locations in the Torrid Zone for approximately three latitude regions, the equatorial 0-8 degrees latitude, 9-15 degrees latitudes, and 16-23.5 degrees latitudes. Development of TRW demonstration building studies is related to the results of the TRW solar cooker-kitchens test stand projects now in progress by Dr. Atul Sagade.
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  • January 2023: TRW studies for a small house in the Torrid Zone
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  • January 2023: Thru-Reflector-Wall (TRW) Nonimaging concentrator solar kitchen studies
Joel Goodman 1, 1-10-23
Joel Goodman 2, 1-10-23


  • January 2023: TRW test stand with box cooker and bamboo
TRW test stand with box cooker and bamboo 2, J
TRW test stand with box cooker and bamboo 1, J


  • January 2023: TRW vertical masonry test wall studies with prefabricated ferrocement funnel-box and CSEB
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  • December 2022: TRW Vertical Masonry Kitchen Wall Studies
TRW, Joel Goodman, 12-27-22
TRW, Joel Goodman, 12-29-22


  • November 2022: TRW Small house kitchen vertical CSEB wall study
TRW Small house kitchen vertical CSEB wall study, Goodman 1, 11-22-22
TRW Small house kitchen vertical CSEB wall study, Goodman 2 11-22-22


  • November 2022:Thru-Reflector-Wall (TRW) nonimaging concentrator solar kitchen studies update 11/14/22
Thru-Reflector-Wall (TRW) nonimaging concentrator solar kitchen studies update 1, 11-14-22
Thru-Reflector-Wall (TRW) nonimaging concentrator solar kitchen studies update 2, 11-14-22


  • November 2022:Thru-Reflector-Wall (TRW) nonimaging concentrator solar kitchen studies update. Prof Dr. Atul Sagade has started a TRW test stand project in India and is planning another in Chile.
TRW kitchen study, Goodman, 11-9-22
TRW kitchen study, Goodman, 11-8-22


  • October 2022: Thru-Reflector-Wall (TRW) nonimaging concentrator solar kitchen studies update
TRW, J


Thru-Reflector-Wall (TRW) Nonimaging concentrator solar image, kitchen studies, 10-18-22


  • October 2022: Thru-Reflector-Wall (TRW) nonimaging concentrator solar kitchen studies update
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J. Goodman text, 9-26-22


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Medical autoclave studies

Joel Goodman , 9-16-22
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Joel Goodman, 9-5-22
Joel Goodman, 9-6-22
  • September 2022: TRW Kitchen Wall Reflectorก TRW kitchen wall reflector details depend on the kitchen building wall optical shape related to latitude location and construction materials and methods. For example, flat glass mirror tiles on masonry, ferrocement or wood wall parts. A TRW kitchen wall shape may be vertical or near vertical to avoid overhanging reflectors near about 23.5 degrees latitude (e.g., about 17-27 degrees); and sloped near the equator (about 0 จC 15 degrees from vertical) with possibility of nonimaging one-sided CPC type slight curvature that would complicate construction. A wider target rectangle (Wo) with larger and multiple cookware may extend the latitude location range to about 30 degrees + for vertical kitchen wall reflectors and seasonal applications. Latitudes with 30 degrees + north and south cover an extensive global area and huge populations. However the site latitude locations need TRW solar engineering to specify reflector shapes and inclinations. TRW TEST STAND studies - All dimensions thus far are preliminary guesses in order to study construction feasibility. In fact, the TRW Test Stand dimensions may be reduced when based on solar engineering. Final dimensions would be based on optical-thermal engineering analysis for selected cookware target(s) and regional latitude specifics.


Joel Goodman reflector development, 8-25-22
Thru-Reflector-Wall (TRW) Nonimaging concentrator solar, (modified Aug. 22) kitchen studies, pg
Thru-Reflector-Wall (TRW) Nonimaging concentrator solar, (modified Aug. 22) kitchen studies, pg
  • August 2022: After specification of one side of a CPC mirror wall (B-T) for selected location, associated building integration studies could be developed in more detail. Slides attached.
J. Goodman text, 8-11-22
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TRW, Joel Goodman, 6-24-22


  • November 2021: Thru-reflector-wall (TRW) nonimaging concentrator solar cooker kitchen studies Joel Goodman text, 11-30-21
Solar_evacuated_tubes

Solar evacuated tubes

Jay Holmes video Feb 7-2016 reference for BIETR project


  • July 2014: Thru-wall solar kitchen building or trailer with vertical oven door diagram. A thru-wall solar kitchen building or trailer has a vertical oven door (0 in Fig A); and reflector parts (Fig A): 1 is a reflector wall above the oven door; 2 is a box with horizontal or inclined inlet aperture (unglazed or glazed); 3 is a ridged- pyramid base/bracket; 4 is an E and W end adjustable or repositioned at noon; and 5 is the other side of a two-sided trough. Cookware targets (Fig B)include: w-1 roaster pots; w-2 HotPots TM; and w-3 all-glass evacuated tubes. Multi-tube racks rolls/slides in-out thru the oven door into the exterior cooking zone. A five tube rack is illustrated in Fig. C. The tubes are horizontal or near horizontal.
  • July 2014: Thru-wall solar kitchen with multi-tube racks roll in-out. Thru-wall solar kitchen with multi-tube racks roll in-out thru doors into the exterior cooking caustic zone, so that batch after batch can be cooked in a day. The multi-tube racks are within the volume of the exterior nonimaging reflector boxes, avoiding wind, and so that E and W end reflectors (repositioned at noon) flapping in wind gusts could not damage the tubes. The tubes can slip out of the racks for ease of tube cleaning.
1-sided CPC trough kitchen, Joel Goodman, 4-16-14
  • April 2014: See adjacent accompanying diagrams and text.
    Sheet metal wall studies 1, Joel Goodman, 4-9-14
    Sheet metal wall studies 2, Joel Goodman, 4-9-14

    Joel Goodman's design ideas

Reflector-metal horizontal lap detail

Reflector metal horizontal lap detail

Thru-wall nonimaging building-size reflector concentrator for reflector

Thru-wall nonimaging building-size reflector concentrator

  • March 2014: Reflected nonimmaging concentrated sunlight from a CPC-type trough thru a vertical wall opening to reflectors funnel sunlight upward to the underside of cookware.
Double hung window cooker, Joel Goodman, 3-4-14
Double hung window cooker 2, Joel Goodman, 3-4-14
  • March 2014: Converting a sun-facing double-hung window wall for non-snow season cooking and baking. The lower window part becomes the cookware doorway to the exterior concentrating reflectors. The window width influences the inlet size of a reflector ‘box’, securely attached to the exterior building wall. Roof overhang and gutters can limit the height of the upper reflector fixed to the building wall around the upper window part (above the box). The reflector ‘box’ would be removed for the snow season and the reflectors on the double-hung window could be removed as well for daylighting and passive cold season heating.
Nonimaging Thru-Wall scoop intro., 2-12-14
Midsize CPC kitchen image, Joel Goodman, 2-11-14
Fixed nonimaging reflector and pyramid base architectonic model for equitorial tropics nonseismic regions

Fixed nonimaging reflector and pyramid base architectonic model for equitorial tropics nonseismic regions.

Reflector pyramid base architectonic model

Reflector pyramid base architectonic model

ET forTw

ET forTw

Joel Goodman, thru-wall prototype, 9-13.

Thru-wall reflector prototype

Nonimaging moblie concentrator, Goodman, 9-9-13

Thru-wall non-imaging mobile concentrator.

  • September 2013: Thru-wall fixed non-imaging reflector concentrator for ovens, cookers, autockaves, etc. A thru-wall fixed nonimaging (NI) reflector concentrator for ovens, cookers, autoclaves, etc. may be a lightweight for the most part attachment to a house or trailer wall. A NI ‘box’ has four creased aluminum-reflector elements attached together, secured to a square based two-angles pyramid-reflector(with grill posts) supported on a bracket(s) structured to the wall. Augmentation is with fixed reflectors attached to the wall, and E and W repositioned reflectors at noon with wind fail-safe design.
Thru-wall model mock-up, Joel Goodman, 7-3-13
LINTEL

Detail section of Thru-wall fixed reflector concentrator.

THRU wall solar oven arched opening

THRU wall solar oven arched opening

THRU wall solar oven door

THRU wall solar oven door

THRU wall ferrocement door frame

THRU wall ferrocement door frame

Joel Goodman update, 1-31-13
  • January 2013: A mirror-tiled concrete base, with grill support bolts casted in, is a nonimaging concentrator shape segment to reflect solar radiation upwards to the underside of cooker-ovens.
  • December 2012: Joel Goodman describes and illustrates the constraints and opportunities for incorporating a permanent thru-wall solar cooker in home design. Wisconsin Thru-the-Wall Solar Cooker
Fixed reflector for solar oven, Joel Goodman, 10-24-12

A fixed curved reflector trough located above a stationary box cooker.

Fixed Nonimaging CPC-type Troughs, Joel Goodman, 1-8-13

Fixed Nonimaging CPC-type Troughs

  • October 2012: The adjacent drawing illustrates using a fixed one-sided reflector trough to augment a built-in solar cooker.
Joel Goodman - Thru wall oven kitchen plan, 10-1-11

Thru-wall oven kitchen plan

Joel Goodman Thru wall oven section, elevation 10-5-11

Thru-wall oven section

  • September 2011: When a thru-wall cooker counter height is higher, 36 inches/ 915mm above kitchen floor level, and the outdoor ground level is lower, 24-36 inches or more below the kitchen floor level, a more substantial construction is required to support the fixed reflector concentrator, possible with an integrated small storage space/room. And a higher rainwater drain permits water storage with a higher gravity flow.


  • May 2011:
Joel Goodman Thru-wall Mirror oven 5-31-11

Thru mirror wall oven for house kitchen

Joel Goodman thru wall cluster home plan 5-31-11

Schematic Cluster of House Plans


  • April 2011:
Joel Goodman solar restaurant concept

A solar restaurant concept

Nonimaging mid-size Solar Kitchen

Non-imaging mid-size solar kitchen

PLAN of nonimaging solar kitchen

Non-imaging solar kitchen plan

Nonimaging fixed reflector scoop section-2010

Non-imaging fixed reflector scoop griddle

Building integrated fixed reflector scoop griddle

Building integrated fixed reflector scoop griddle

  • January 2011: A building integrated fixed reflector non-imaging mid-size solar kitchen schematic for non-seismic locations combines: multiple thru-mirror wall greenhouse type ovens on one side, and on the other side a scoop type reflector concentrator.


Goodman, partial plan kitchen thru-wall

Partial plan of a house kitchen with a thru-wall oven.

  • The adjacent illustration of a partial house kitchen plan illustrates orientation and solar access requirements for a thru-mirror wall greenhouse type oven. The top edge of a nonimaging fixed reflector can align with different wall and roof house construction types and shapes.
Various fabrication-construction methods for a chair-size thru mirror wall oven nonimaging reflector concentrator include:
  1. Masonry substrates (compressed stabilized earth blocks, fired bricks, etc.) for gluing flat laminated glass mirror segments.
  2. Bent metal reflectors bolted to a center concrete pyramid with glued reflectors.
  3. Prefabricated injection molded plastic substrates for adhering reflectors.


  • December 2010: Joel has provided some conceptual ideas for incorporating thru-wall solar oven, and solar still installations.
Goodman, Thru wall oven

Thru wall oven

Goodman, Thru Wall water still

Thru wall water still

Goodman, solar kitchen studies

Larger oven possibilities

Goodman, Thru wall solar oven nonimaging fixed concentrator

Thru wall solar oven non-imaging fixed concentrator

Goodman top hinged reflector door 2005

Thru-wall reflector door flap-section (2005).

Goodman box cooker furniture

Box cooker augmenting fixed reflector furniture (2005).


Documents

Contact

Joel H. Goodman
P.O. 14, Dodgeville, Wisconsin 53533
USA

Tel: (608) 935-5483

Email: joelhgoodman3@hotmail.com