公开(公告)号：WO2019074764A1

公开(公告)日：2019-04-18

申请号：PCT/US2018/054436

申请日：2018-10-04

Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY

Inventor： BRADSHAW, David Andrew ,  WELCH, Andrew Michael ,  CRANE, Curtis C. ,  NELSON, Calvin Andrew

IPC: F25B39/04 ,  F25B43/04

CPC classification number: F25B39/04 ,  F25B43/043 ,  F25B2339/047 ,  F25B2700/195 ,  F25B2700/21163

Abstract: A vapor compression system comprising a purge unit fluidly coupled to a condenser of the vapor compression system, wherein the vapor compression system comprises a memory storing instructions and a processor configured to execute the instructions to control operation of the purge unit, wherein the instructions comprise a purge cycle, wherein the instructions of the purge cycle comprise: instructions to activate the purge unit for a first predetermined period of time (286); instructions to determine whether one or more evacuations occur during the first predetermined period of time (288); instructions to restart the purge cycle when one or more evacuations occur during the first predetermined period of time (290); and instructions to deactivate the purge unit for a second predetermined period of time when the processor determines that no evacuations occur during the first predetermined period of time (292).

公开(公告)号：WO2019074768A1

公开(公告)日：2019-04-18

申请号：PCT/US2018/054448

申请日：2018-10-04

Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY

Inventor： WELCH, Andrew Michael ,  BRADSHAW, David Andrew ,  KLINE, Charles S.

IPC: F25B39/04 ,  F25B43/04

CPC classification number: F25B39/04 ,  F25B43/043 ,  F25B2339/047 ,  F25B2700/195 ,  F25B2700/21163

Abstract: A vapor compression system comprising a purge unit fluidly coupled to a condenser of the vapor compression system, wherein the vapor compression system comprises a memory storing instructions and a processor configured to execute the instructions to control operation of the purge unit, wherein the instructions comprise a purge cycle, wherein the instructions of the purge cycle comprise: instructions to receive data relating to operating parameters of the purge unit; instructions to determine a duration of the purge cycle based at least in part on the data relating to the operating parameters of the purge unit, and based at least in part on a model of the purge unit, wherein the model is configured to predict a minimum duration of the purge cycle that enables a refrigerant-to-air ratio in the purge unit to meet at least one industry standard; instructions to activate the purge unit for the determined duration of the purge cycle; and instructions to deactivate the purge unit after the determined duration of the purge cycle.

公开(公告)号：WO2019040768A1

公开(公告)日：2019-02-28

申请号：PCT/US2018/047780

申请日：2018-08-23

Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY

Inventor： MONTEITH, Maccrae William ,  KOHLER, Jay Albert ,  BRADSHAW, David Andrew ,  WELCH, Andrew Michael

IPC: F25B9/08 ,  F25B43/04 ,  F25B21/02

Abstract: The present disclosure relates to a heating, ventilation, air conditioning, and refrigeration (HVAC&R) system (14) including a refrigerant loop and a purge system (80) configured to purge the HVAC&R system of non-condensable gases. The purge system includes a liquid pump (84) configured to draw a first refrigerant flow from an evaporator (38), a controllable expansion valve (86) configured to receive the first refrigerant flow from the liquid pump and reduce a temperature of the first refrigerant flow, and a purge heat exchanger (88), which includes a purge coil (108). The purge coil is configured to receive the first refrigerant flow from the controllable expansion valve, a chamber of the purge heat exchanger is configured to draw a mixture of the non-condensable gases and a second refrigerant flow from a condenser (34), and the purge heat exchanger is configured to separate the non-condensable gases from the second refrigerant flow utilizing the first refrigerant flow.