摘要 :
The demand for polyester production has doubled in recent years. This paper describes energy-efficiency improvements in industrial polyester production through process optimisation, which includes the possibility of fuel savings f...
展开
The demand for polyester production has doubled in recent years. This paper describes energy-efficiency improvements in industrial polyester production through process optimisation, which includes the possibility of fuel savings for dry saturated steam production. Decreasing fuel consumption in processes with condensate, as well as flue-gas heat recovery, offers process efficiency growth and thermal pollution reduction. Also, the use of solar energy as an energy source is proposed. A solarised process without condensate and flue-gas heat recovery results in a natural gas saving of 61%. Using feed-water preheating together with condensate recovery reduces gas consumption by 66%. Fuel savings of 72% are shown using a solar field collector combined with a feed-water tank and economiser (ECO) for boiler-feed-water preheating, with a positive side effect of flue gases cooling from 204 degrees C to 95 degrees C. With an air preheater for combustion-air preheating together with a solar field and feed-water tank, the fuel saving becomes 71%, while the flue gas temperature diminishes from 204 to 64 degrees C. The hybrid system, which includes a solar collector, boiler feed tank, ECO and air preheater, achieves natural gas saving up to 73% and a flue gas exhaust temperature of just 41 degrees C.
收起
摘要 :
Some of the researches expressed connection between the numbers and size of the microclimatic air layers on thermal insulation of clothing. The insulation of the ensembles is much affected by the air enclosed between the clothing ...
展开
Some of the researches expressed connection between the numbers and size of the microclimatic air layers on thermal insulation of clothing. The insulation of the ensembles is much affected by the air enclosed between the clothing layers. In loose fitting clothing, they are less subjected to compression and thus add more to the overall thermal insulation. The heat and the moisture are released from the body into the microclimatic layers, subsequently changing properties of the entrapped air. The volume of the microclimatic air layers was investigated by the use of non-contact 3D CAD method. The temperature and humidity changes of microclimatic layers were also observed. This paper represents layer by layer quantification of the clothing ensemble volume with jackets as covering garment and the impact of the microclimatic volume on the clothing insulation. The three-level laboratory testing was performed with human subjects dressed in selected ensembles.
收起
