COMMERCIAL GRADE REFRIGERATOR

Seawater bitterns as a source of liquid desiccant for use in solar-cooled greenhouses [An article from: Desalination]

This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
The processes of desalination and sea-salt production currently produce large quantities of by-product, in the form of brine and bitterns, which is generally regarded as waste. This article explores the scope for exploiting the hygroscopic salts occurring in these by-products - such as magnesium, calcium and sodium chloride - as desiccant solutions in a greenhouse cooling system. These solutions are compared to other liquid desiccants more conventionally used in solar-driven refrigeration: namely solutions of lithium chloride, lithium bromide and zinc chloride. To establish which properties are relevant, we discuss the relation of the properties of the liquid desiccant to the attributes of the greenhouse as a whole. A property of primary importance is hygroscopicity, as quantified by the equilibrium relative humidity (ERH). Further properties reviewed include cost, availability, density, viscosity, specific heat capacity, thermal conductivity, heat of dilution, water absorption capacity, human- and ecotoxicity, and corrosivity. Calculations based on five locations (Tunis, Jiddah, Abu Dhabi, Mumbai and Bangkok) show that the liquid desiccant should have ERH @?50% to give improved cooling compared to both direct and indirect evaporative systems. Except for sodium chloride, all six salts considered meet this requirement. Magnesium chloride is the most abundant salt in seawater bitterns and both magnesium and calcium chloride stand out as being of low toxicity. Their hygroscopic properties, though inferior to those of the lithium and zinc salts, make them suitable for cooling of greenhouses (even if not of human dwellings). We envisage an integrated desalination and agricultural system, comprising a solar desalination plant supplying freshwater (for irrigation) and bitterns (for cooling) to greenhouses, enabling efficient water use and local crop production in hot climates.

At GHL (Galactic Handling and Logistics) we realize that shipping that small packet to your door in today's hive cities or pan-solar rings, is completely different than shipping containers across systems between our hubs!

This is why we had Karella Shipyards especially design the Destiny Delivery mk 1 small parcel delivery vehicle. A one-man, zippy atmospheric vehicle with sturdy armor and generous cargo space to cover that last, fateful mile before your very door.

If you can't track it on our Pan-Galactic Netsite, chances are it's already on its way*!

----
* legal notice: other chances include, but are not limited to:
1 - it is completely lost
2 - it has been delivered to the wrong door and stolen by your neighbor
3 - it was delivered at precisely the time slot allotted to you (4.34 to 4.35 AM Galactic Standard Time, on Morgday, 23rd of Buktember 2234), you did not reply to the courier in the standard 45 seconds, and a new delivery will be made atthe next available time slot, approximately in 23 years.

----

My not-entry for the SCI-LUG small fighter contest (not an entry because, while fitting all other rules, a small parcel is just not a starfighter)...

This house is powered via 3 sources.
Grid (unreliable 20-40% up time due to remote nature of location).
11KW Diesel Generator. (Depending on season, Diesel supply costs and generator maintenance can be an ongoing bleeding cost).
6KW supplementary Solar Power. Powering lighting, entertainment, air conditioning in common areas (living rooms) and refrigeration.

This digital document is a journal article from Desalination, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
This article deals with the modelling, thermodynamic simulation and Second Law analysis of an ammonia-water double-effect, double-generator absorption chiller. The analysis of the unit established a simulation thermodynamic model as well as the limits of the operating conditions. Computer simulation was carried out in order to determine its stream properties and the amount of heat and work exchanged with the surroundings. Simulation results were then used to study the influence of the various operating parameters on the performance coefficient of the chiller. To quantify the irreversibility of each component of the chiller and to determine the potential for each component to contribute to overall system energy efficiency, the Second Law analysis of thermodynamics was applied. Results indicated that the absorber, solution heat exchangers, and condenser have the most potential to improve chiller energy efficiency.