Condensing Boiler Research Articles

Condensing boilers in buildings and plants refurbishment

Condensing boilers allow better performances when return temperatures from the plant are lower and above all when these temperatures are below the dew temperature of the smoke. That is the reason why many believe that condensing boiler is not suitable for the traditional heating plant terminals: the radiators.Instead the classic control system with weather compensation curve produces relatively low temperatures and an appreciable condensing operation during March, April, October and November. Moreover, condensing boilers allow a better performance than traditional boiler even when they do not perform condensing operation.However for the optimum exploitation of condensing boilers in a radiator plant, variable-flow-rate plants should be selected that permit every outside condition to maintain a high difference between delivery and return temperature. This control selection, which is fully consistent with the use of thermostatic valves, needs variable-flow-rate pumps and, if possible, with proportional head.

Measured Energy Savings after Installing New Condensing Boilers and Retro-commissioning the Heat Recovery System at a County Jail

The Umatilla County Justice Center installed a $200,000 project in December 2007 that replaced a failed piece of equipment and lowered natural gas use. Two new high efficiency boilers were installed to provide space heating and domestic hot water, and the existing heating, ventilation, and air conditioning (HVAC) systems were retro-commissioned for energy savings. The facility's gas use has been reduced by 53% since these projects were installed two years ago. This article provides a background of the projects and presents the measured energy savings.