Aluminized fabric is best used to reflect radiant heat. Drape it over the SRL at your head and chest area where your face and hands might be outside the TQ. It will cut down on wind chill from the sides but vent out the ends. If condensation forms on it then make it smaller so that you have more ventilation. Staying warm in the cold is a constant balancing act between dead air and moving air.
When you build a fire fashion a space blanket into a reflective shield on the side opposite of your position to get a space heater effect. A British physicist named Rumford did a lot of work on radiant heat and designed a better fireplace in the 18th C. but Ben Franklin and others began to use cast iron and steel stoves so Rumford was practically forgotten except in technical fields. His work contributed greatly to our understanding of thermodynamics.
Last edited by MDSH; 10-05-2012 at 09:45..