Powered Air Conditioner.
AMMONIA REFRIGERATION UNIT
The unit charge consists of
ammonia, water, and hydrogen.
Ammonia means ammonia without water, Aqua Ammonia is a solution of
ammonia and water which is used in refrigeration and air conditioners
not a vapor compression type.
compression systems use compressors to compress the ammonia vapor.
Absorption type systems do not use a compressor but instead use a
The Intermittent absorption system uses a generator charged with water
ammonia. A heat source, usually a kerosene flame, heats this solution
generator. The ammonia is vaporized and driven off.
A condenser, at the top of the system, condenses the ammonia vapor into
liquid. The liquid flows by gravity into the liquid receiver shown
then into the evaporator. During the generating cycle, little or no
refrigerating effect is taking place. As the system cools, the pressure
causing the liquid ammonia in the evaporator to boil (flash off) and
heat. The cycle is completed when vaporized ammonia is re-absorbed in
ammonia solution in the generator.
The forced air is generated by the sun (solar) to produce a forced air
condition. This system would be very energy efficient. The solar rays
this unit will be the strongest during the actual time of use. A
up system would allow you a cooling effect through the evening. This
could be made into an AC or DC system just by adding a convertor.
Air-conditioning is the dominating energy consuming service in
buildings in many countries. In many regions in Europe the demand for
cooling and dehumidification of indoor air is growing due to increasing
cooling loads. Conventional cooling technologies exhibit several clear
disadvantages: their operation demands a high energy consumption; they
cause high electricity peak loads; they significantly contribute to the
Greenhouse effect (induced CO2 emissions resulting from the production
of electricity) and they generally employ refrigerants that have
several negative environmental impacts (global warming, ozone
depletion).This project addresses these problems by development and
integration of the necessary technologies for utilisation of solar
energy for air conditioning of buildings. The industrial target is to
develop and demonstrate a new air-cooled solar-driven NH3-H20
absorption system for air-conditioning and other cooling applications,
with a capacity of 10 - 50 kW, using a compound parabolic collector and
a gas-driven back-up system.
The pressure in the system drops as the water cools and absorbs
Liquid ammonia (Light Blue) flows into the evaporator, begins to
and cools it.
Evaporated ammonia (Aqua Blue) flows back through the tube (B).
It is again absorbed by the water in the generator. Refrigeration
usually until the next firing of the kerosene burner.
The small restrictor perform two functions, it allows the liquid to
the evaporator at a controlled level. This protects the evaporator from
The restrictor also acts as a expansion valve which
greats a pressure differential.
A pressure differential is essential to the
refrigeration cycle as it causes the liquid ammonia to change it's
point from a high pressure flash of temperature to a lower pressure
Without this change in pressures the refrigeration would not be
performed and the system would simply act as an ammonia container.
This type of refrigerating system is quite simple. The piping is welded
because the pressures on the generating cycle are quite high. The
ability is quite good. Kerosene flame heated absorption refrigerators
popular in areas where electric power is not available.
Other means of firing the burner can be propane or natural gas. Many RV
refrigerators use a combination of propane fired burners and add a
12 volt fan assembly to improve cooling within the evaporator section
the refrigerator (Ice Box).. Many types of absorption systems are on
market these days and are not limited to small appliances. The theory
and has been applied to very large commercial systems and perform in
the same manner.
Most small RV type refrigerators are not field repairable due to the
charge ( The right amount of Aqua Ammonia ) and the nature of the
construction. If a small unit develops a leak, the best thing to do is
replace it with a new one. Most manufacturers design the units to last
a very long time, but a damaged unit should be replaced (Leaking). Most
Aqua Ammonia leaks are easy to find as are Anhydrous Ammonia leaks the
smell is very strong and aids in detecting
even the smallest of leaks.
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Bill Warman ®
V.S. Protective Shield Inc.
(c)Bill Warman 1-26-2008
(c)Copyright 2008 V.S.
Protective Shield Inc. *Legals