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Advances in VIP Design for Super Insulation of Domestic Appliances
Abstract
The advances in the vacuum insulated panel (VIP) design for super insulation of domestic appliances are discussed. VIP are very efficient thermal barriers, having thermal conductivity 3 to 10 times lower than the conventional insulators. The panels are produced by vacuum packaging an open-celled, micro-porous insulating core in a gas barrier bag.
... Moreover, it is possible to obtain an average of 25% in energy savings by improving room insulation alone [9]. Furthermore, improvements in the system performance can be achieved by using alternative refrigerants [10] and selection of suitable equipment. ...
... MC simulation with 5000 iterations was executed according to the obtained value ranges, defined probability distributions, and the NPV calculation shown schematically in Fig. 5 and described in Equation (9). ...
Widespread construction of cold storage buildings is important to ensure sustainability of the agricultural industry and reduce food loss. However, the number of cold storage buildings in most developing countries is insufficient because of financial difficulties. Currently, the most critical factor for encouraging investors to finance such projects is the payback period. In this study, the power consumption and profitability of cold storage buildings were investigated based on their capacities using data from selected cold stores in Turkey. The optimal storage capacity was calculated by simulation, and the relationship between the payback period and the capacity of cold stores was analysed using the obtained results. It was found that the amount of power consumed per unit volume for stores with capacities from 100 to 2100 t of apples was 63.8% while that from 2100 to 10000 t was 33.3%. Additionally, the optimal cold storage capacity was determined to be 3500 t with a two-year payback period.
... 1. Improving the cabinet and door insulation to reduce heat losses. For instance, a 25% average energy saving is observed by the VIP (Vacuum Insulation Panels) integration in the cabinet (Manini et al., 2003). The drawback of this technology is linked to the fact that the manufacturing process is still expensive. ...
This paper presents the results of experimental tests carried out to investigate the performance of a household refrigerator using a phase change material (PCM). The PCM is located on the back side of the evaporator in order to improve its efficiency and to provide a storage capacity allowing several hours of refrigeration without power supply. The system has been tested with water and with a eutectic mixture (freezing point −3 °C) and for a range of operating conditions (PCM thickness, ambient temperature, thermal load). The analysis of the results shows a significant improvement of the performance compared to a conventional system.
... 1. Improving the cabinet and door insulation to reduce heat losses. For instance, a 25% average energy saving is observed by the VIP (Vacuum Insulation Panels) integration in the cabinet (Manini et al., 2003). The drawback of this technology is linked to the fact that the manufacturing process is still expensive. ...
This paper studies the effect of adding a phase change material (PCM) slab on the outside face of a refrigerator evaporator. A dynamic model of the vapour compression cycle including the presence of the phase change material and its experimental validation is presented. The simulation results of the system with PCM show that the addition of thermal inertia globally enhances heat transfer from the evaporator and allows a higher evaporating temperature, which increases the energy efficiency of the system. The energy stored in the PCM is yielded to the refrigerator cell during the off cycle and allows for several hours of continuous operation without power supply.
Thermal insulation with thermal resistivities of at least 20 (h ft ² F/ Btu in.) have been shown to have the potential for significant energy conservation if employed in residential and commercial refrigerator/freezers Many materials and systems have been proposed which may be incorporated into refrigerator/freezers to achieve this potential.
The current state of the art for advanced evacuated insulations which may achieve resistivities of 20 was established by reviewing data on many materials available in the open literature on the dependence of the thermal performance on internal pressure. The costs for the powdered, fiber, foam and multilayer materials were then obtained from the manufacturer of the products Possible candidate materials for m- clusion into refrigerator/freezers are described and ranked based upon their thermal properties and costs.
Several materials were found that may be used to make super-insulation panels with material costs of less than 3.00 per board foot will result if metallic contamment is required.