Wärmerückgewinnungsanlagen — auch zum Kühlen

Abstract

The usefulness of conventional heat recovery systems in animal houses during heating periods tends to be restricted to times when the perceptible heat given off by the animals is not sufficient to generate a heat output that is desirable for the pens. Once the temperature in the animal house exceeds this setpoint temperature, control valves are deployed to channel the incoming / outgoing air flow past the heat exchanger via a bypass valve, thus preventing any further exchange of heat between the incoming and outgoing air. By humidifying the outgoing air prior to entry into the heat exchanger, this is cool and can escape the fresh air heat. Because of the separate streams of air (Supply and exhaust air) it affects the water content is not the stable air. Using a dynamic calculation model, the fall in temperature inside the stable can be predicted depending on the thermal efficiency of the heat exchanger, the air flow and ventilation rate and the amount of water vaporised. The report deals with the theoretical principles and the effect of heat exchangers featuring adiabatic cooling of the incoming and/or outgoing air on the climate in animal houses. On the basis of an example, the cooling effect of different variants is compared and assessed. The results presented are based on a dynamic calculation model. The technical and economic feasibility of heat recovery systems of this kind will be examined later in a pilot plant.