Humidity control system

Abstract

A humidity control system ( 10 ) includes a refrigerant circuit ( 50 ) including a compressor ( 53 ), a first adsorption heat exchanger ( 51 ) carrying an adsorbent thereon, an expansion valve ( 55 ) adjustable in opening and a second adsorption heat exchanger ( 52 ) carrying an adsorbent thereon, supplies humidity-controlled air to a room by operating alternately in a first batch mode in which the second adsorption heat exchanger ( 52 ) adsorbs moisture in air and the first adsorption heat exchanger ( 51 ) releases moisture to air and a second batch mode in which the first adsorption heat exchanger ( 51 ) adsorbs moisture in air and the second adsorption heat exchanger ( 52 ) releases moisture to air, controls the opening of the expansion valve ( 55 ), sets, upon start of the first batch mode, the opening of the expansion valve ( 55 ) to that at the end of the preceding first batch mode and sets, upon start of the second batch mode, the opening of the expansion valve ( 55 ) to that at the end of the preceding second batch mode.

1 . A humidity control system that includes a refrigerant circuit ( 50 ) including a compressor ( 53 ), a first heat exchanger ( 51 ) carrying an adsorbent thereon, an expansion valve ( 55 ) adjustable in opening and a second heat exchanger ( 52 ) carrying an adsorbent thereon and supplies humidity-controlled air to a room by operating alternately in a first batch mode in which the second heat exchanger ( 52 ) adsorbs moisture in air and the first heat exchanger ( 51 ) releases moisture to air and a second batch mode in which the first heat exchanger ( 51 ) adsorbs moisture in air and the second heat exchanger ( 52 ) releases moisture to air, the humidity control system comprising:
 an opening control means ( 32 ) for controlling the opening of the expansion valve ( 55 ); and   an initialization means ( 33 ) for setting the initial opening control value of the opening control means ( 32 ) for each of the first and second batch modes by setting, upon start of the first batch mode, the initial opening control value for the expansion valve ( 55 ) to the opening of the expansion valve ( 55 ) at the end of the preceding first batch mode and setting, upon start of the second batch mode, the initial opening control value for the expansion valve ( 55 ) to the opening of the expansion valve ( 55 ) at the end of the preceding second batch mode.   
   
   
       2 . The humidity control system of  claim 1 , further comprising a correction means ( 34 ) that, when the capacity of the compressor ( 53 ) changes, corrects the opening control value of the opening control means ( 32 ) to allow the opening of the expansion valve ( 55 ) to reach a degree according to the change in the capacity of the compressor ( 53 ). 
   
   
       3 . The humidity control system of  claim 1 , wherein the initialization means ( 33 ) is configured, when in setting the initial opening control value of the opening control means ( 32 ) for one of the first and second batch modes the opening of the expansion valve ( 55 ) at the end of the preceding batch mode does not exist, to set the initial opening control value based on the opening of the expansion valve ( 55 ) at the end of the other batch mode.