Optimization of Insulation Design for Refrigerating Systems

Abstract:

Economic operation with minimal energy consumption and low costs of a cooled room or a refrigerant piping system depends largely on the quality and thickness of their insulation. The classical method of insulation rating for refrigeration systems is based on respect of the condition to prevent condensation of water vapours in the air on the surface of insulation or on limiting heat gain, but rarely leads to optimum in terms of a technical and economic criterion. In this paper are described some types of insulation for refrigeration applications and is developed a rating optimization model of these insulations with a high level of generality. It uses multiple dynamic optimization criteria simple or compound, which better reflects the economic and energy complex aspects, present and future. Based on this model were elaborated two computer programs implemented on PC microsystems. Numerical examples will be presented to demonstrate the accuracy and efficiency of the proposed optimization model. These show the good performance of the new model.

• Periodical: Applied Mechanics and Materials (Volume 510)
• Pages: 202-207
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.510.202
• Online since: February 2014
• Authors: Ioan Sarbu*, Emilian Valea, Gabriel Ostafe
• Keywords: Comparative Analysis, Cooled Rooms, Insulation Rating, Optimization Model, Refrigerant Piping

References

[1] R.S. Lenox, P.A. Hough: Minimizing Corrosion of Cooper Tubing Used in Refrigeration Systems, ASHRAE Journal, vol. 37 (1995), p.11.

[2] ASHRAE: Fundamentals Handbook, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta (2009).

[3] M.K. Kumaran: Vapour Transport Characteristics of Mineral Fibber Insulation from Heat Flow Meter Measurements, In: ASTM STP 1039, Water vapour transmission through building materials and systems: Mechanisms and measurement, American Society for Testing and Materials (1989).

DOI: 10.1520/stp22954s

[4] C.P. Hedlin: Moisture Gains by Foam Plastic Roof Insulations under Controlled Temperature Gradients, Journal of Cellular Plastics, no 3 (1977), pp.313-316.

DOI: 10.1177/0021955x7701300503

[5] ASHRAE: Refrigeration Handbook, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta (2010).

[6] M. Storkmann: Insulating Against the Low Temperatures by Flexible Insulation Materials, Technical Building Equipments, vol. 22, no. 5, Tg. Mures, Romania (2004), pp.60-62.

[7] V. Korsgaard: Innovative Concept to Prevent Moisture Formation and Icing of Cold Pipe Insulation, ASHRAE Transactions, vol. 99, no. 1 (1993), pp.270-273.

[8] J.F. Malloy: Thermal Insulation, Van Nostrand Reinhold, New York (1969).

[9] W.C. Turner, J.F. Malloy: Thermal Insulation Handbook, McGraw Hill Book Company, New York (1981).

[10] I. Sarbu: Refrigeration Systems, Mirton Publishing House, Timisoara (1998).

[11] J.P. Curtis: Optimization of Multiple Thin Thermal Insulation Layers, Proceedings of the 3rd IASME/WSEAS Int. Conference on Heat Transfer, Thermal Engineering and Environment, Corfu, Greece, August 20-22, 2005, pp.424-429.

[12] I. Sarbu, E. Valea, G. Ostafe: Insulation Rating Optimization for Refrigerating Systems, In: Recent Advances in Environmental Science, Proceedings of the 9th WSEAS Int. Conference on Energy, Environment, Ecosystems and Sustainable Development, Lemesos, Cyprus, March 21-23, 2013, pp.110-114.

[13] N. Georgescu: Methodology to Establish the Total Embedded Energy in Building Materials, Civil Engineering Journal, Bucharest, no. 9 (1978), pp.53-62.

[14] I. Sarbu: Numerical Modelling and Optimizations in Building Services, Polytechnic Publishing House, Timisoara (2010).