Experimental Study on Operating Characteristic of the System of Ground Source Heat Pump Combined with Floor Radiant Heating of Capillary Tube

At first, the article presented particularly the working theory of the system of ground source heat pump combined with floor radiant heating of capillary tube, the characteristic of soil layers and the arrangement form of capillary tube mat and the floor structure. And then, the specific experimental method was employed to study the ground heat exchanger performance of three wells of 90 m depth, heating performance of heat hump unit and capillary tube mat and the characteristic of temperature change on the layer of capillary tube mat, the floor surface and indoor air. By search, some important conclusions were drawn that coefficient of performance COP of heat pump unit in heating mode is increased 13.4% when the average supply water temperature is 32.8°C compared with 43.6°C and the effect of energy conservation is apparent when the ground source heat pump provides low temperature hot water at 28-35°C to floor radiant heating system of capillary tube for heating. In addition, heating capacity of floor radiant heating system of capillary tube was strong and its maximum heating volume was 255 W/m² during the heating course.