Mollenberg-Betz was founded in 1910 by Henry J. Mollenberg and Jacob Betz as a machine shop serving nearby shipping, steel mills, and other industries. Early on, the founders were asked to design and install a refrigeration system for a dairy, and for several decades the company designed and manufactured custom refrigeration systems for a variety of industrial and commercial customers. During t...

This paper describes a multi-evaporator vapor compression model capable of simulating the dynamic behaviour of transport refrigeration systems. A discrete multi-zone control volume approach is utilised for modelling the condenser and evaporators. All other major refrigeration components including compressor, expansion valves, receiver, pressure-regulating valves are modeled using time-dependent...

Computer-based control of refrigeration chambers must be fault tolerant because of their critical mission. Poor or no response in case of wrong operation of the system may result in the loss of the products. Achieving fault tolerance involves all elements in the control system, including microcontrollers and the interconnection network. This work presents a practical architecture for distribute...

Defrosting in supermarket refrigeration systems is normally controlled by a preset time cycle with most display cabinets timed to defrost every 6 hours. It is widely acknowledged that timed defrost may cause a number of unnecessary defrost cycles and this reduces the energy efficiency of refrigeration systems as well as the accuracy of temperature control of the cases. This paper investigates t...

Nanostructured materials for refrigeration applications are experimentally realized by molecular beam epitaxial growth of Co/Cr superlattices using mean-field theoretical concepts as guiding principles. Magnetocaloric properties are deduced from measurements of the temperature and field dependence of the magnetization of our samples. More generally, the potential of artificial antiferromagnets ...

Improved food storage and particularly the widespread growth of refrigeration over the current century, with its consequent indirect effects on dietary habits, have been repeatedly advocated as one of the reasons for the substantial decline in gastric cancer rates observed during the last few decades in developed countries (Doll & Peto, 1981; Howson et al., 1986). Most of the evidence, however,...

A novel capillary tube has been tested and evaluated experimentally in the refrigeration cycle of window type air conditioner. Three twisted capillary tubes have been demonstrated and evaluated to show the performance of these tubes and its ability in the depressurization process seeking for short capillary tube. The effect of twist angle and the number of twisted points on the refrigeration cy...