During the 2016-2017 heating season

the floor heating systems of a teaching building in Beijing was carried out for a field test. There are two air-source heat pump (ASHP) systems for two areas

i.e. area A and area B

in the building. The room temperature control and hydraulic balancing devices were equipped in the system of area A

and the system operation mode was divided into two periods: Period 1 with a water supply temperature of 35 °C for heating and Period 2 with a temperature of 20 °C for freeze protection. After 67 days of monitoring the indoor and outdoor temperatures

the temperature and flowrate of supply and return water

and power consumption

the operation effect of the two systems was compared and analyzed. The results show that during Period 1

the system of area A not only ensures a more suitable indoor temperature

but also a significantly lower heating capacity than area B

as well as a 24.4% energy saving effect on power consumption. In addition

the control devices do not affect the unit performance of area A. The COPs (coefficient of performance) of areas A and B were 3.56 and 3.54

respectively

and the actual operating performance of the unit was close to the performance curve. During Period 2

the thermostat setting remained unchanged

and the energy saving rate of area A decreased slightly to 16.3%. It is recommended that the thermostat should be set to match the water supply temperature for further energy savings.