Research on humid air net saving at drying
2007
Novakova, A. | Enimanev, K. | Andonov, K. | Ermenkov, T.
Research subject are the energy net savings at the usage of atmospheric air potential as a renewable energy source at produce drying. A mathematic-economical method for net income modeling is applied. Starting point is the diagram about enthalpy and humidity content of the atmospheric air (AA), parameters characteristic of the drying process and statistical data on humidity content by certain values of the AA and country climatic regions. Results are defined in energy units from 1,000 kg absorbed humidity from the AA and are assessed in lv from 1,000 kg absorbed humidity from the AA. Incomes are discounted. The AA potential to absorb humidity in every climatic region varies widely by months as follows: Kneja 1.16¸2.43 times compared to lowest potential, Sandanski 1.3¸2.81; Varna 1.05¸2.83; Chirpan 1.3¸2.57.Average levels of the potential by climatic regions change from 1.44 to 2.24 units. Expected net income is in direct proportion to the potential of the AA. It varies by months as follows: Kneja 1.12¸1.73 times in comparison with the highest potential; Sandanski 1.11¸1.63 times; Varna 1.01¸1.99 times; Chirpan 1.04¸1.89 times. Average income level by climatic regions changes from 1.2 to 2 units. Net income from the AA potential is higher for low temperature processes (40¸50 °C). Net income data is assessed by energy price 0.144 BGN/kWh. Discount of net income shows, that within the examined inflation level in the country (46%) and average interest rate 12%, expected net income increase is 1.45 time at inflation rate 4% and around 1.32 times at inflation rate 6%. The represented methodology for defining the AA potential as drying agent, is applicable for every technological process of drying and differentiating income by climatic regions. The vast range of net income level change by months and climatic regions (from 5 to 183%), and should be considered at planning terms for buy off and refunding, as well as net present money value, etc. )
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