QUESTION 3-A Sales of industrial vacuum cleaners at R. Lowenthal Supply Co. over the past 13 months are as follows: SALES($1,000s) MONTH August September TITE SALES($1000s) MONTH January February 11 14 14 17 16 March 12 October 10 April 14 November 15 Мay 16 December 17 June 11 January jo back to bn 11 July eing m (a) Using a moving average with three periods, determine the demand for vacuum cleaners for next February. (b) Using a weighted moving average with three periods, determine the demand for vacuum cleaners for February. Use 3, 2, and 1 for the weights of the most recent, second most recent, and third most recent periods, respectively. For example, if you were forecasting the demand for February, November would have a weight of 1, December would have a weight of 2, and January would have a weight of 3. (c) Use exponential smoothing with a constant of 0.2 to forecast the demand for vacuum cleansers for January to February. (d) Evaluate the accuracy of each of these methods (Compute the MAD and MSE)) oback His

QUESTION 3-A Sales of industrial vacuum cleaners at R. Lowenthal Supply Co. over the past 13 months are as follows: SALES($1,000s) MONTH August September TITE SALES($1000s) MONTH January February 11 14 14 17 16 March 12 October 10 April 14 November 15 Мay 16 December 17 June 11 January jo back to bn 11 July eing m (a) Using a moving average with three periods, determine the demand for vacuum cleaners for next February. (b) Using a weighted moving average with three periods, determine the demand for vacuum cleaners for February. Use 3, 2, and 1 for the weights of the most recent, second most recent, and third most recent periods, respectively. For example, if you were forecasting the demand for February, November would have a weight of 1, December would have a weight of 2, and January would have a weight of 3. (c) Use exponential smoothing with a constant of 0.2 to forecast the demand for vacuum cleansers for January to February. (d) Evaluate the accuracy of each of these methods (Compute the MAD and MSE)) oback His

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 2RQ

See similar textbooks

Similar questions

A supply line carries a two-phase liquid-vapor mixture of steam at 300 lbf/in2. A small fraction of the flow in the line is diverted through a throttling calorimeter and exhausted to the atmosphere at 14.7 lbf/in2. The temperature of the exhaust steam is measured at 250 deg F. Determine the quality of the steam in the supply line.
39 - A fixed volume insulated tank, which was initially empty, was connected by a valve to a distribution line carrying helium gas at a temperature of 125ºC. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 2066.7 kJ/kg B) 2014.7 kJ/kg NS) 701.0 kJ/kg D) 649.1 kJ/kg TO) 2118.6 kJ/kg
15 - A fixed volume insulated tank, initially empty, was connected to a distribution line carrying helium gas at a temperature of 135ºC by means of a valve. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 701.0 kJ/kg B) 597.1 kJ/kg NS) 2014.7 kJ/kg D) 2066.7 kJ/kg TO) 2118.6 kJ/kg
19- Which of the following can change temperature in sea water ? a. Ocean Thermal Energy b. Geothermal Energy c. Wind Energy d. Biomass Energy
6-The point at which water directly converts into steam is called ___________ A.sensible heat of vaporisation B.latent heat of vaporisation C.saturation point D.critical point
Which of the following statement(s) is(are) correct? Group of answer choices A. The actual work is less than the theoretical work of expansion during irreversible adiabatic process. B. The actual work is less than the theoretical work of compression during irreversible adiabatic process. C. N D. The change in entropy is greater in irreversible adiabatic process compared to reversible adiabatic process. E. No heat transfer occurs during the expansion and compression in irreversible adiabatic process.
11-A piston-cylinder assembly initially contains refrigerant-134a (R-134a) at a pressure of 0.8 MPa and a temperature of 60°C. In the system where the piston can move freely, the temperature of R-134a is reduced to 32°C.Which of the following diagrams correctly represents the process?
Identify if the property of the following steam: Temp Specific Enthalpy Quality C kJ/kg % 287 2661 ?
Identify if the property of the following steam: Pressure Specific Enthalpy Specific Entropy MPa kJ/kg kJ/kg-K 13 2483 ?
Which of the following is the correct statement? a. Irreversible engines have maximum efficiency b. The increase in entropy is obtained from a given quantity of heat at a low temperature c. The entropy represents a maximum amount of work obtainable per degree drop in temperature d. All the reversible engines have the same efficiency e. All the reversible and irreversible engines have the same efficiency f. The change in entropy may be regarded as a measure of the rate of the availability of heat for transformation into work g. All engines are designed as reversible to obtain maximum efficiency
Taking the recent World Energy Council and United Nations resource-base figures for the total amount of fossil energy in the ground worldwide as 356,000 quads, how long will it take to exhaust our fossil resources, assuming that we can recover one-half of the resource base and that usage grows at 3% per year? The world currently consumes about 400 quads of primary energy per year, of which 85% is from fossil sources. (Hint: you will need to account for the compounding, exponential growth effect of the 3% per year increase in consumption.)
A turbine is driven by a system that enters the turbine at the ff. conditions: 500 kg/h, 44 atm, 450 deg C, 60 m/s linear speed. The steam exits at a point five meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 360 m/s speed. 70,000 W of shaft work is delivered by the turbine while 104 kilocalories/h heat is lost. Here are the questions to be answered: 1. Why is the value of Wexp 0? (Explain) 2. Given the above values, can you calculate the Wflow? (Yes/No)