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Results of long-term operating tests on a prototype tube-within-tube recuperator designed for recovery of heat from broiler house exhaust air are presented. The construction and operation of the recuperator accounts for specific conditions of the poultry house, such as very high dustiness and humidity of air. Two-year tests of the recuperator in real operating conditions of a typical broiler house for 16,000-18,000 chickens showed that its energy efficiency is 30-37% and it can be used over the entire production cycle of 42-45 days without the need to remove the dust deposited on the exhaust channel walls. The results of microbiological tests give no indication that the recuperator might pose a threat to biosafety of the broiler house after the 2-year operation. The results of comparative studies on basic parameters of microclimate and production efficiency in the experimental and control part of the broiler house showed that the recuperator's operation was beneficial for the energy management and production results.
This study presents and discusses the results of 2-year measurements of air temperature, air humidity, litter temperature and litter moisture in a broiler house and of ground temperature below the floor and outside the building. Except temporary overheating, air temperature was found to conform to animal breeding standards. Air humidity was too low at the start of rearing and had to be additionally increased. It was subject to considerable fluctuations in the summer cycles. Litter studies showed that broiler chickens were exposed to adequate temperature for 20 days during the winter production cycle and for just 7 days during the summer cycle. Changes in litter moisture showed an upward trend in time. Litter moisture was greater next to walls than in the centre of the production facility. The time course of litter moisture was approximated by a quadratic function. Results of ground temperature measurements revealed considerable heat accumulation in the ground and its cooling during technolo.
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