The cooling load coefficient method

The cooling load coefficient method is a simplified calculation method based on the transfer function method for the convenience of hand calculation in engineering. Unlike the harmonic response method, the heat and cooling loads calculated by the transfer function method do not take into account whether the disturbances vary periodically and are not expressed in Fourier series terms, instead, the boundary conditions are discretized into unit perturbations distributed in time series according to the z transformation, which is the polynomial of z-1. The coefficients of the polynomial are equal to the value of the continuous function at the sampling time of the corresponding power. In order to simplify the calculation of the cooling load caused by solar heat gain, the cooling load coefficient method uses the basic equation of transfer function method and the corresponding room transfer function to form the cooling load coefficient. For the cooling load formed by the heat transfer from the maintenance structure, the cooling load coefficient method uses the corresponding transfer function to form the cooling load temperature. In this way, when calculating the cooling load of a building, the cooling load coefficient and the cooling load temperature can be found out according to the corresponding conditions, the cooling load caused by the solar heat and the cooling load caused by the heat transfer from the maintenance structure can be calculated by using the one-dimensional stable heat conduction formula. The detailed calculation is as follows.