Experimental Study on Variable Water Volume Control Methods without Using Differential Pressure for Heat Supply to Buildings

Abstract

This experimental study aims to determine the control characteristics of new variable water volume control methods without using differential pressure for heat supply to buildings. The experiments in the study investigated not only the new methods for controlling the pump speed without using differential pressure, but also the general methods for controlling the pump speed using differential pressure. The experiments have been based on the assumption that heat is supplied to two buildings. Furthermore, the basic data such as the power used for the conveyance of heat by each control method were obtained and the control characteristics were analyzed. It was found that the pump speed could be controlled even by the variable water volume control methods without using differential pressure as is used in methods such as methods using secondary side water temperature control and valve opening control, and it was shown that the methods are effective for reducing the power consumption for the conveyance of heat.