Abstract
This paper describes the method for calculating the room air temperature, the inner surface temprature and the heating load of multi-room under the various heating conditions. These conditions include the cases of that the room temperature or the heating load is found by prescribing the amount of heat supply or the room temperature, and that both values during the pre-heating are found by prescribing the room temperature at the end of preheating in an intermittent heating system. The equations which show the relationship of the room air temperature, inner surface temperature, heating load and so on are introduced using the matrix calculation. In the solution of the matrix equations involving a large number of degrees of freedom, it is very difficult to invert the matrix. The matrix is partitioned by four sub-matrices to reduce the size of matrix. As one of the sub-matrices to be inverted is symmetric and positive definite, the matrix can be inverted efficiently by Choleski's method and the iteration method.
