Submitted by Maria.Kapsalaki on Tue, 03/22/2016 - 09:08
Using solar heat energy has been paid attention to as effective natural energy use. In this study, we deal with air-based solar heat system, which is used for not only ventilation but heating and hot water supply by hot air.
In order to save energy for building cooling during hot days in regions with cool nights, air circulation throughout the interior of the building has been envisaged as a means to lower the temperature of the building structural mass. In this way, energy required for cooling the building interior is reduced, due to lowered temperature of the wall, ceiling and other structural elements mass, and a greater storage of heat resulting from various heat gains the following day when air-conditioning is on.
Measurements of radon and radon daughters in 11 buildings in five states, using active or passive solar heating showed no significant increase in concentration over the levels measured in buildings with conventional heating systems. Radon levels in two buildings using rock storage in their active solar systems exceeded the U.S. Nuclear Regulatory Commission's 10 CFR 20 limit of 3 pCi/l for continuous exposure. In the remainder of the buildings, radon concentrations were found to be at levels considered to be normal.
Reports on research project to study the effects of different methods of heating an office, temperature and draught conditions, ventilation efficiency and heat storage in joint structures. Gives test room digramatically and tracer gas concentration under different conditions, both during summer andwinter.
Reviews different lightweight structures' abilities to store heat. Shows a cutaway drawing of a single-family dwelling illustrating how stored heat is distributed. Relates heat storage capacity to structural density. Notes the importance of air distribution in attaining efficient heating.