Welcome to IceFAC

The Window Freezer + air cooler (abbreviated as F-AC) is a fridge-freezer that utilizes part or all of the freezer compartment to cool indoor air during summer. It operates by freezing water at night, when outdoor temperature is lower, and using the stored ice to provide cooling during the day.

What Makes IceFAC Unique?

• Saves electricity by using off-peak energy at night. 
  
• Has a larger external fan coil unit on its top, to more quickly cool indoor air. 
• Can cool faster than conventional window or portable air conditioners.
• Portable and versatile for year-round use.

How It Works

• At night, the F-AC freezes water inside a Insulated Ice-Box, taking advantage of lower ambient temperatures to save electricity.
• During the day, the frozen water melts, releasing stored thermal energy to cool indoor air.
• A top-mounted external heat exchanger and air fan (or a fan coil unit) transfer the cool air into the room.
• Like conventional window or portable AC units, the F-AC expels heat outdoors via its condenser.
• Instead of relying solely on water-ice, alternative Phase Change Materials (PCMs) can be used for improved efficiency.
• During summer, the larger external insulated water-ice Box may be positioned on top of the unit to cool air and save space.

The 3 images above, display an icebox sitting on top of a window refrigerator-freezer (F-AC) with the back of the F-AC exposed to the outdoors.  F-AC has a (optionally removable) larger external fan coil unit mounted on top of it, to more quickly cool indoor air.  A cone shaped heat exchanger (a cone shaped hole for air passage) is inside the icebox. The vertical lines are copper pipes containing water-ice to cool the air passing through the cone inside the icebox.  The blue square is an air fan blowing hot air into the cone shaped hole inside the icebox. The cone shaped hole in the icebox acts as a heat exchanger. At night when temperature is cooler than day, the freezer freezes the ice in the icebox.  During the hot days, the air fan (blue) blows hot air through the hole into the insulated icebox (heat exchanger). Cold air then exits the cone shaped hole and enters the home, cooling indoor space.  In another embodiment, the ice-box sitting on top of the freezer is not connected to the freezer.  To freeze the ice at night, a door opens on the top of the freezer so that the ice-box can be placed into the freezer. During the day, the icebox is removed from inside the freezer and moved to any spot that requires cooling.  A fan is then placed behind it to blow cool air at that spot. 

Advantages of F-AC Over Conventional Portable or Window ACs

1. True Portable Spot Cooling

• A conventional portable/window AC must stay attached to a window or have access to outdoor air to remove heat.
• The F-AC, however, can be detached from the window during day since it does not require an active evaporator. The ice that was frozen overnight is used for cooling instead.

2. Reduced Size, Cost & Maintenance

• The F-AC eliminates the need for an internal air duct and air fan, reducing both size and manufacturing costs.
• It prevents indoor air pollution caused by dirty, hard-to-clean internal fan coils in traditional ACs.

3. Increased Energy Efficiency

• Energy savings from fan use: According to the U.S. Department of Energy, using a large fan alongside an AC can allow for a 4°F increase in thermostat settings, saving energy costs.
• Better performance in dry climates: The F-AC saves more electricity where day and night temperature differences are large.
• Dehumidification in humid climates: While energy savings are lower in humid regions, dehumidification improves indoor comfort.
• Efficiency increases with temperature: Unlike traditional ACs that become less efficient as outdoor temperatures rise, the F-AC becomes more efficient in hotter weather, as heat transfer to the Insulated Ice-Box speeds up ice melting and cooling.

Features	Description
Functionality	Works as a fridge/freezer and an air cooler by utilizing frozen water/ice to cool indoor air.
Portability	Unlike a conventional portable or window AC, F-AC can be detached and moved away from the window while cooling air.
Higher Efficiency at Higher Temps	Becomes more efficient as indoor temperature rises because of faster heat transfer to the Insulated Ice-Box.
Indoor Air Quality	Reduces indoor air pollution by eliminating the need for a built-in air duct and internal fan coil. F-AC has a larger external fan.
Climate Suitability	Suited for dry climate (significant day-night temperature difference) and humid climate by dehumidifying indoor air.
Phase Change Material (PCM)	Uses water/ice or other PCMs with lower/higher melting points to optimize Ice-Box volume and cooling efficiency.
Seasonal Adaptability	The top heat exchanger and air fan are detached & removed when AC is not needed (winter, spring, autumn).
Energy Efficiency	Saves electricity by freezing water when outdoor temperature is lower (during night) using stored thermal energy for cooling.

Variations of F-AC

1. Dedicated Evaporator for PCM (Insulated Water Ice-Box) Freezing

2. Internal Placement in Freezer or Refrigerator

   • The Ice-Box can be placed inside the freezer or refrigerator.
   • Different PCMs with varying melting/freezing points can be used.

3. Alternative PCM Usage for smaller Insulated Ice-Box and faster cooling
   

   • There are quite a few PCM materials that freeze around -15 degrees Celsius.  One could consider paraffin waxes or other organic materials with tunable melting points, or eutectic solutions of salts that freeze below 0°C.  The colder the freezing-melting point of PCM material, the smaller the size or volume of PCM reservoir (Insulated Ice-Box) can be for the same amount of cooling and the faster cooling of indoor air.  To make it easier to understand, let’s think in reverse.  Imagine a cabin that in winter needs to be heated by a radiator.  If the temperature of the radiator is 200 degrees Celsius, it can heat the cabin twice as fast as the same radiator at 100 degrees Celsius.

The F-AC is a highly efficient, space-saving solution for cooling. It leverages thermal energy storage to provide off-grid cooling during peak hours, reducing electricity consumption and improving comfort.

Key Benefits:
✔️ Energy-efficient, saving power by freezing water at night.
✔️ Portable – detaches from the window for flexible cooling.
✔️ Can be used year-round as a fridge/freezer.
✔️ Lower manufacturing and operational costs.
✔️ Environmentally friendly with reduced power consumption.

Comparison: F-AC vs. Conventional Window or Portable AC

Features	Window Freezer + AC (F-AC)	Window or Portable AC
Cooling Mechanism	Uses ice frozen at night for cooling during hot summer days	Uses a compressor and refrigerant system
Energy Efficiency	High – utilizes stored thermal energy	Low – continuously uses electricity while running
Portability	Can be detached & moved away from windows while cooling	Must remain connected to window or outdoor air
Indoor Air Quality	External fan coil.  External fan is larger.	Prone to dust and mold in internal fan coils
Climate Suitability	Ideal for dry or humid climates. Dehumidifies indoor air	Works in all climates but less energy efficient
Seasonal Use	Functions as a fridge/freezer when AC is not needed	Can only be used as an AC
Refrigeration	✔	❌
Installation Required	❌	✔
Ideal Use	Studios, Homes, Offices, RVs, Dorms, Motels, Show Rooms, Factory Floors	Homes, Offices, Rooms

Contact Us

We’d love to hear from you! Whether you have questions, need support, or are interested in licensing, sales, partnership opportunities, feel free to reach out to us.   

Ray Arjomand

📞 Phone: 775-470-3113
📧 Email: Ray@Rabpid.com
📍 Address: 834 Pyramid Way, Sparks NV 89431  USA
🌐 Website: Fridge-Ac.com

2 Utility Patents Granted: U.S. Patent: 10,634,370 & U.S. Patent: 9,080,801

Phone: 775-470-3113         Email: Ray@Rabpid.com            Address: 834 Pyramid Way, Sparks NV 89431  USA           Website: Fridge-Ac.com