The present invention relates to a cold and hot dryer, and more particularly, it is possible to dry the hot air and cold air cross into the storage compartment using a single device when drying the agricultural and marine products as needed, and the refrigerant pipe during the cross blow operation of cold and hot air Compressor (10) for compressing the refrigerant for the purpose of allowing the air blowing immediately crosses the hot air and cold air without waiting for the pressure balance of the； A first heat exchanger 30 and a second heat exchanger 40 generating hot air or cold air by heat exchange of the refrigerant； A cold / hot converting unit 20 selectively transferring the refrigerant compressed by the compressor to any one of the first heat exchanger and the second heat exchanger； The pressure reducing coil is installed in the refrigerant pipe between the first heat exchanger and the second heat exchanger, and is formed between the first pressure reducing tube 72 on the first heat exchanger side and the second pressure reducing tube 74 on the second heat exchanger side. 70； An amplifier 50 for expanding and evaporating a refrigerant between each of the heat exchangers and the decompression coils, and between the first auxiliary pipe 82 and the second auxiliary pipe 84 connecting the first and second pressure reducing pipes, respectively. It is formed is provided a cold and hot dryer consisting of an electronic valve 80 to achieve a pressure balance between the first pressure reducing pipe and the second pressure reducing pipe when the compressor is stopped.본 발명은 냉온 건조기에 관한 것으로, 더욱 상세하게는 농수산물 건조시 하나의 장치를 이용하여 저장실 내부로 필요에 따라 온풍과 냉풍을 교차하여 건조시킬 수 있도록 하고, 냉풍과 온풍의 교차 송풍 운전시 냉매관의 압 평형을 위해 대기하는 시간 없이 즉시 온풍과 냉풍으로 교차하여 송풍할 수 있도록 할 목적으로, 냉매를 압축하는 압축기(10)； 상기 냉매의 열교환으로 온풍 또는 냉풍을 생성하는 제1열교환기(30)와 제2열교환기(40)； 상기 압축기에서 압축된 냉매를 상기 제1열교환기와 제2열교환기 중 어느 하나로 선택 이송하는 냉온변환부(20)； 상기 제1열교환기와 제2열교환기 사이의 냉매관에 설치되는 것으로, 제1열교환기 측의 제1감압관(72)과 제2열교환기 측의 제2감압관(74) 사이에 형성된 감압코일(70)； 상기 각
