07-11-2012, 05:11 PM
ABSORPTION REFRIGERATION AND HEAT PUMP SYSTEM
ABSORPTION REFRIGERATION.docx (Size: 45.46 KB / Downloads: 33)
ABSTRACT
This invention relates to a cooling and heating system
which operates on the absorption and phase change heat
exchange principle. More particularly it relates to a
continuous heat actuated, air cooled, multiple effect
generator cycle, absorption system,
In further aspects, this invention relates to a system
constructed for use with an absorption refrigeration
solution pair comprising a nonvolatile absorbent and a
highly volatile refrigerant which is highly soluble in the
absorbent, A disclosed refrigerant pair are ammonia as the
refrigerant and sodium thiocyanate as the absorbent.
BACKGROUND OF THE INVENTION
There are two major types of absorption refrigeration
equipment in commercial use: (1) air cooled systems using
ammonia as the refrigerant and water as the absorbent, and
(2) water cooled systems using water as the refrigerant and
lithium bromide as the absorbent.Although these are the major types in commercial use,
and there are many patents relating to these and other
types, variations have been patented from these general
principles and the following are typical examples of such
patents: U, So 41055,964-Swenson et al. and U. So
2,350,115-Katzow.Others have demonstrated air cooled absorption
30 refrigeration systems using other absorbent, refrigerant
1 pairs. The following patents relate to these systems: U. So
41433,554-Rojay et al. and U. S. 3,483,710-Bearint.Still others have@ patented water cooled refrigeration
systems using other salts or other salts in combination with
lithium bromide as the absorbents. The following are
examples of these: U. S. 3,609,086-Modahl et ale and U* So
3,541,013-Macriss et al.Water cooled refrigeration circuits using the double
effect generator are also in commercial use and have been
10 patented as seen in the following patents: U, S* 495,420-
Loweth et ale, U* S. 3,389,573-Papapanu et al., U. S.41183,228-Saito et al., and U, S* 2F1821453-Sellew.In absorption refrigeration and/or heating systems, the
generator, sometimes called desorber, is a very important
part of the system and contributes significantly-to the
overall efficiency
DISCLOSURE OF THE INVENTION
A combination of a double effect generator absorption
cycle, the thermo/physical properties -of which are enhanced
by the application of the sodium thiocyanate/ammonia
absorbent/refrigeration pair, with the arrangement of a
reverse cycle air cooled double effect refrigeration circuit
with generator and heat exchanger in a stacked coil
configuration including tube in tube concepts, together with
the combination of energy recovery motors to contribute to
the power requirement of the solution pump and means for
positioning the refrigerant reversing valve(s) to provide
warm refrigerant vapor through the refrigerant to air heat
exchanger while still producing heat from the system as a
way of defrosting the refrigerant to air heat exchanger when
outside air temperatures are low,
The invention includes an absorption refrigeration
and/or heating process wherein a highly volatile chemically
and thermally stable refrigerant (ammonia) is alternately
absorbed in and expelled from an absorbent (sodium
thiocyanate) with the process conducted as a double effect
system in the generator section.In further summary, the invention includes an
absorption refrigeration and/or heating system in connection
with a cooling or heating load, and a heat sink or source,
preferrably ambient air, to selectively provide heat to or
remove heat from the load, comprising.