A spreadsheet to calculate costs of operating evaporators with a range of fuel types.
Showing 201 – 208 of 208 resources
Our objectives were to develop time series of maple production costs and to observe the effects of changing technology, fuel price, interest rate, and sap sugar content on production cost. In addition, the relationships between major production cost items were examined.
An older step-by-step guide to building a preheater.
A guide to designing and constructing an efficient sugarhouse.
A cost analysis of processing maple sap to syrup for three fuel types, oil-, wood-, and LP gas-fired evaporators, indicates that: (1) fuel, capital, and labor are the major cost components of processing sap to syrup; (2) woodfired evaporators show a slight cost advantage over oil- and LP gas-fired evaporators; however, as the cost of wood approaches $50 per cord, wood as a fuel would no longer have this cost advantage; (3) economies of scale exist in processing maple sap to syrup; (4) in 1977 the total cost of production, including both sap production costs and processing costs, for a medium-size (750) gallons of syrup) operation was $8.36 per gallon of syrup for oil-fired evaporators, $7.97 per gallon of syrup for wood-fired evaporators, and $8.37 per gallon for LP gas-fired evaporators.
In 1974 the Vermont Experiment Station, Proctor Maple research team, and the Northeastern Forest Experiment Economics Research Unit at Burlington, VT, launched an intensive 4-year processing research program. This program was designed to accomplish two major goals: (1) increase the efficiency of the conventional open-pan evaporator system from approximately 65 percent to approximately 80 percent; and (2) evaluate new evaporator systems for processing maple syrup products. As an initial part of the first research objective, the energy balance of the conventional open-pan evaporator has been completed. Also, design and laboratory and field testing of a sap preheater system has been completed.
A test of vapor compression distillers for processing maple syrup revealed that: (1) vapor compression equipment tested evaporated 1 pound of water with .047 pounds of steam equivalent (electrical energy); open-pan evaporators of similar capacity required 1.5 pounds of steam equivalent (oil energy) to produce 1 pound of water: (2) vapor compression evaporation produced a syrup equal in quality to that from a conventional open-pan evaporation plant; and (3) a central plant producing 8,000 gallons of syrup per year should yield a return of 16 percent on investment. Increasing annual product output should increase the return on investment.
A study of the engineering and economic effects of heat exchangers in conventional maple syrup evaporators indicated that: (1) Efficiency was increased by 15 to 17 percent with heat exchangers; (2) Syrup produced in evaporators with heat exchangers was similar to syrup produced in conventiona lsystems in flavor and in chemical and physical composition; and (3) Heat exchangers reduce per unit production costs, and can yield greater production and higher profits.