Refrigeration capacity of an inspired-air cooling system

Refrigeration capacity of an inspired-air cooling system— A mathematical model Article

Iyengar, SS. (1972). Refrigeration capacity of an inspired-air cooling system— A mathematical model . 17(4), 303-308. 10.1016/S0021-8634(72)80035-0

This paper describes the development of a mathematical model to predict the refrigeration capacity required of an inspired-air cooling system for dairy animals. The inspired-air system has been generalized from the standpoint of animal heat dissipation to the system via head, neck and respiratory tract. A duct configuration to accommodate eight cows has been selected to allow a mathematical solution of refrigeration capacity for a specific situation. The heat transfer into the duct, principally by conduction from the outside, has been considered in formulating the model. The model developed considers variable ambient and inspired-air conditions, variable animal heat dissipation to the system as a function of varying ambient conditions and ambient heat dissipation to the system. The predictions of this model compare favourably with the theoretical and experimental results of other research workers. Required refrigeration capacities varied from 0·12 ton/cow to 0·41 ton/cow depending upon the assumed ambient conditions. Equations giving refrigeration capacity as a function of outside and inspired-air conditions are presented. © 1972, The British Society for Research in Agricultural Engineering. All rights reserved.