A vapor compression system including a closed fluid circuit having operably coupled thereto, in serial order, a compressor, a first heat exchanger, an expansion device, a second heat exchanger and a fluid vessel. The polymer article contains a base polymer and at least one metal compound dispersed in the base polymer. The invention also provides methods of using the cells of the invention to screen for compounds that modulate viral RNA replication, including HCV RNA replication. Over time, the heat transferred from the water to the device then radiates into the environment\u2014thus reducing the total energy cost for a household by reducing the thermal load on the main heating unit for the household. In the invention, Compound of a specified structure having a C10 to C22 hydrocarbon group is applied at least once in a period from a planting stage to a flowering stage of potato.