Some concepts just make sense- like when the developer of a solar powered pontoon boat pointed out-"Since most recreational boating is done when the weather is nice, solar power is particularly well adapted to the task." We were thinking that way while looking for a solar powered air conditioner- when do you need it? When it is hot and sunny. We looked at Justin's SolCool but we knew that natural gas fired AC units or propane fridges existed and thought heat is heat- there must be one somewhere, and put google to work. This is the first of a series- the Direct-Fired Absorption system.Gas fired air conditioners work on the absorption principle. "The distinguishing characteristic of absorption cooling equipment is that it produces cooling by using heat energy as an input, rather than by using mechanical energy. For this reason, absorption chillers were once common in facilities that had large boiler plants with excess capacity during the cooling season. Unfortunately, absorption cooling is inefficient, and absorption chillers appeared destined for extinction." ...

In large absorption machines, the actual refrigerant is water at very low pressure. An absorber, usually the salt lithium bromide, is used to move water vapor through the system. Crystallization of the salt is a major operating problem that the design of an absorption chiller seeks to avoid."Direct Absorption (DFA) was developed in Japan in the 60's and now the world's largest maufacturer is Broad Air Conditioning in China. "To power our absorption cycles, BROAD absorption chillers use a wide range of energy sources: oil, gas, as well as solar power, steam, hot water and exhaust. air conditioner units 5 tonAs our chillers do not use electricity as an energy source, they have the potential to dramatically reduce investment in electricity infrastructure in both public and private sectors." ac unit bracketThey now appear to be extremely efficient and save lots of electricity.best ac split units

Finally, we find on their site:"BROAD strives to be like our ancestors that mastered the miracle of fire, like James Watt who harnessed the power of steam, like Thomas Edison with his devotion to testing and retesting. Our goal is to limit the use of fossil fuels and exploit the use of renewable energies such as solar energy to provide cooling and heating needs.Two years ago, BROAD provided an American customer with our first solar energy powered air conditioning system. This system has performed exceptionally well to date. BROAD's solar energy engineers and salespeople have drafted an ambitious plan to commercialize the solar energy air conditioning system worldwide."We did not find the home-sized unit we were looking for, but the peak loads in North America are driven by air conditioning in summer- this looks like a good way of taking much of that off the grid. Visit the surprisingly complete and thorough website at ::Broad Air Conditioning and read their ::environmental manifesto here

A Wide Range of Condensing Units Model RCS Condensing Units: ASHRAE 90.1 2010 efficiencies!. Reliable—Scroll compressors have fewer moving parts; two circuits on all units over 20 tons provide backup cooling Quiet—Optional quiet condenser fan on units over 20 tons reduces radiated sound by 11dB Optional low ambient operation range down to 0°F Model ACZ-B Condensing Units: Efficient - up to 11.4 EER at full load and up to 14.5 EER at part load (IPLV). Quiet - all dBA ratings are tested in accordance with ARI Standard 370. Less acoustical treatment can lower your project's cost. Reliable - scroll compressor have fewer moving parts. Optional low ambient operation down to 0 degrees F MicroTech II® controls with the Open Choices® feature for easy integration using BACnet®, LonTalk®, or Modbus® standard open protocols Double click on above image to view full picture 20 ton H-Frame Industrial Heavy Duty Floor Shop Press

This shop press provides tremendous pressure with very little effort Add to My List Energy Efficiency Improved in 13- to 20-ton L Series® R-410A Rooftop Units DALLAS, TX – September 6, 2007 – Now there are more ways than ever for businesses to reduce their operational expenses and lower their total cost of HVAC ownership. Lennox Industries Inc. has improved the energy efficiency of its L Series® R-410A rooftop unit product line in units as large as 20 tons. Higher-efficiency compressors and a more efficient coil design have been integrated into L Series R-410A rooftop units in 13-, 15-, 17.5- and 20-ton capacities. With these improvements, the units allow efficiencies as high as 12.0 EER and13.3 IPLV. This is the second enhancement to the popular L Series line this year: 7.5- to 10-ton models were upgraded earlier this summer. Designed to help businesses control costs while meeting sustainability goals, the new 13- to 20-ton units are expected to be available for delivery by late October 2007, while upgraded 7.5- to 10-ton units are being shipped to job sites now.

The upgraded units each feature environmentally friendlier R-410A refrigerant, helping businesses avoid higher costs that may be linked to the upcoming phase-out of chlorine-containing refrigerants such as R-22. L Series rooftop units are designed for: Faster, easier installation and maintenance, with features such as a full-perimeter base rail and toolless-access panels Centralized control and simple troubleshooting via the Integrated Modular Controller Advanced moisture control with the optional Humiditrol® dehumidification system Peak cooling performance as a result of multiple compressors and the use of thermostatic expansion valves Superior HVAC and building control via optional integration into the L Connection® Network, which ties together multiple units with other building functions such as lighting or exhaust fans Updated technical documents are available now. About Lennox Industries Inc. A worldwide leader in residential and commercial heating and air conditioning systems, Lennox Industries Inc. is based near Dallas, Texas.