Refrigerant leakage from failed braze joints is a multi-billion dollar problem for the global HVAC&R industry. Leaks are typically caused due to mechanical fatigue from extreme pressure cycling, temperature cycling including exposure to freeze/thaw cycles, or vibrational wear induced from rotating electrical machinery. Three tests to accelerate mechanical fatigue were devised to simulate real w...

There is no reliable in situ measurement method of air-to-air heat pump seasonal heating performances. Several methods were previously developed but they only validated steady-state conditions. In real life, dynamic sequences such as defrost cycle and starting phases occur, which are not considered these methods. The goal this work to complete one the existing so that it can address both phases...

In this study, alcoholic extracts of swiss chard and watercress were prepared the percentage yield was calculated, then quantitative qualitative detection its active compounds using Chromatography Mass Spectrometry-GC/MS technology, introduced into preparation bovine birch, study effect on physical properties represented in water carrying capacity, which amounted to (18.47, 18.33)%and loss duri...

fridges are used in various industries, and heat exchanger is one of the main components of these systems; therefore, efficiency analysis of these systems is very important. in many fridges, frost over the heat exchanger tubes or pipes affects the system operation and reduces heat transfer between the refrigerant and ambient, so defrosting systems are usually used to enhance heat transfer. desi...

The objective of this paper is to optimize defrost/demist performance in a vehicle. However, to initiate the problem, it is necessary to have a thorough understanding of flow behavior within the compartment. So a full-scale model of passenger compartment has been modeled and the air stream from very near to the windshield up to back of the compartment has been analyzed applying computational fl...