DETAILED DESCRIPTION I claim: 1.
A new composition of matter comprising Norbornadiene-Quadricyclene having reduced flammability by the addition of a halogenated hydrocarbon.
2.
A refrigerant comprising Norbornadiene-Quadricyclene and a halogenated hydrocarbon.
Description:
This invention relates to a novel solar energy system.
The world's need for efficient utilization of as yet unused energy sources grows daily.
Virtually all of the energy sources presently being used are either non-renewable (i.
e.
, fossil fuels) or present substantial risk to the environment (i.
e.
, nuclear fuels).
Other energy sources not yet in substantial use include wind and solar energy.
Solar energy is distinct from all others in that it is limitless and in constant supply.
Until recently, the feature that distinguished fossil and nuclear energy from solar energy was the physical and chemical stability of fossil and nuclear fuels and the absence of a solar fuel.
It is noted that the term "fuel" means the stored form of energy and, as such, provides the physical-chemical means of storage and controlled utilization.
A good fuel of any type should be inexpensive, easily handled, non-toxic, and high in energy content.
An ideal fuel, in addition to the above, would be recyclable.
The prior art discloses many solar energy systems based on water or other aqueous fuel media, and also some eutectic salt systems.
All of these require heating by the sun to raise the fuel above ambient temperatures and it is necessary to maintain such raised temperatures by costly and inefficient insulating means until the energy is finally used as in residence heating or the like.
U.
S.
Pat.
Nos.
4,004,571, 4,004,572 and 4,004,573, all issued Jan.
25, 1977, and assigned to Battelle Corp.
, disclose solar energy systems using mixtures of water and certain isomerizable materials, but acknowledge difficulties in operating, including the necessity to actually supply heat to induce reverse isomerization, conflicting reactions in the systhem as the temperature rises, thus limiting conversion efficiency and storability, and the necessity for separate storage of products, as well as other problems
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Heat Accumulators 
