What distinguishes the research, investigation, and analysis phase from later phases of the historical preservation process? It involves careful attention to the history of the structure.

It is the only phase that does not involve construction.

It is primarily involved with fact finding.

It is the only phase that does not involve design.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.