Use of heat exchangers in ventilation systems of pigsties in dependence on outside air temperature
2010
Zagorska, V., Latvia Univ. of Agriculture, Jelgava (Latvia) | Jesko, Z., Latvia Univ. of Agriculture, Jelgava (Latvia) | Ilsters, A., Latvia Univ. of Agriculture, Jelgava (Latvia)
To raise the level of energy efficiency of the ventilation systems of pigsties it is useful to introduce heat exchangers. A heat exchanger is a device built for efficient heat transfer from one medium to another. In the case when a heat exchanger is used in the ventilation systems of premises of pigsties, clean and cold air (in the autumn-winter period) gets amount of heat energy from unclean but warm inside air. Respiration of pigs and the processes occurring on the surface of manure cause the generation of carbon dioxide and ammonia, which are considered harmful gases not only for people and animals but also for the equipment, high relative humidity that occurs also during respiration of pigs influences working conditions as well. The article deals with experimental results obtained from the experiments about plate counter-flow heat exchanger models with plastic cellular boards (HE PVC) and plastic plates (WVT-120K) as heat transfer surfaces. Operational parameters describing the energy efficiency of heat exchangers were calculated – power of recovered heat energy (kW), heat transfer coefficient (WmE-2 deg CE-1), and coefficient of efficiency by recovered heat. Due to better operational parameters of experimental recuperative outflow heat exchanger (HE PVC) simulation and analysis of its exploitation during 4 seasons (December/January) depending on outside air temperature in the article are made as well. The possibility of development of ESA heat exchanger construction with built-in tubular electrical heater to preheat outside air (at outside air temperatures below -15 deg C) has been carried out in the research.
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