NGHIEN CUfU-TRAO D | PHAN TICH HIEU SUAT CUA MAY LANH HAP THU AMMONIA-NU' - 10"C thi COP cfla he thdng tang (COP > 0,49) va bgi so tuan hoan eua he thdng giam Ngflgc lai, gilm nhilt bay hdi t^ < -10 "C thi COP eua he thong giam (COP < 0,49) va bdi sd tuan hoan cua he thdng tang Khi tang nhiet dp ngflng tu hoac nhiet dp hap thu (t^ > 38 "C hoac t^ > 38 "C) thi COP eua he thdng giam va bdi sd tuan hoan eua he thong tang Ngflpc lai, giam nhiet dp ngflng tu hoac bap thu (t^ < 38 "C va t^ < 38 "C) thi COP cua he thdng tang va bdi so tuan hoan cua he thong giam Nhilt dp phat sinh tfl 95 "C trd xudng thi he thdng khdng boat ddng dflpc, tang TAP CHf CO KHi VIET NAM • nhilt phat smh thi COP ctia he thdng tang rat nhanh d giai doan ngfldng dat gia tri cflc dai tai lO-C va sau dd se giam cham d i n 150 "C, bgi so tuan hoan cua he thdng giam Nhiet nfldc giai nhiet va nhiet bp phat sinh phai dfldc dieu khien phu hpp d l dat dflpc COP tdi flu Ddi vdi he thong dieu kien boat ddng cu t h l t^ = t^ = 38''C, t^ = -lO^C thi nhilt phat sinh tdi flu t^ = 106 -115 "C, COP dat tfl 0.5 - 0,48