Overview
Hello, I need help with these following questions regarding district heating. Note that ome questions build on each other! Thank you for helping :)
Question 1 10 points How is the concept of heat density defined, and what does this measure describe?
Question 2 10 points The overall regulation of a district heating system consists of four independent control systems: Unanswered 1: Definition of the current heat demand Unanswered 2: Providing conditions for internal heat delivery within the building by ensuring temperature requirements are met Unanswered 3: Providing conditions for the extraction of flow (and heat) from the network Unanswered 4: Providing conditions for heat delivery to customers
Question 3 10 points Why are the five strategic supply resources so important for the synergy economy of district heating?
Question 4 10 points For the distribution network, the total distribution cost is dominated by: (Unanswered)
Question 5 10 points The total distribution cost mainly consists of four different categories of annual costs: Unanswered 1: Represented by the annual repayments of the investments made in the district heating network Unanswered 2 Unanswered 3 Unanswered 4
Question 6 10 points Explain the concepts of base load, intermediate load, and peak load, and comment on their annual operating times. Base load: Unanswered 1 in the duration diagram, Unanswered 2 in operating hours Intermediate load: Unanswered 3 in the duration diagram, Unanswered 4 in operating hours Peak load: Unanswered 5 in the duration diagram, Unanswered 6 in operating hours
(Choose from: Bottom, In the middle, At the top, Few, Around half the year, Many)
Question 7 15 points A district heating system has three different boilers with different fixed and variable costs. Boiler A: Fixed cost = 150 SEK/kW, Variable cost = 190 SEK/GJ Boiler B: Fixed cost = 600 SEK/kW, Variable cost = 110 SEK/GJ Boiler C: Fixed cost = 1300 SEK/kW, Variable cost = 80 SEK/GJ What is the optimal number of operating hours for boilers A, B, and C? (NOTE: Pay close attention to the units!) Show the calculations in the following question. Answer: Boiler A: Unanswered 1 hours Boiler B: Unanswered 2 hours Boiler C: Unanswered 3 hours
Question 8 5 points In Question 7: Boiler Unanswered 1 is the peak load. Boiler Unanswered 2 is the intermediate load. Boiler Unanswered 3 is the base load.
Question 9 10 points A house has a heat demand of 470 MWh/year. The price to the customer is 627 SEK/MWh, the marginal production cost is 397 SEK/MWh, and the service pipes cost an average of 2,960 SEK/m. How far from the district heating network can it be located if the district heating company wants to recover its investment within 10 years (payback period)? (Answer with numbers only, unit: meters)
Question 10 5 points A house has a heat demand of 487 MWh/year. The district heating network is 407 m long. What is the linear heat density for the service pipeline? (Answer with numbers only, two decimal places, unit: MWh/m)
Question 11 5 points If the payback period is 9 years and the minimum linear heat density for the service pipeline is 1.3 MWh/m, what should the minimum linear heat density be for new service pipelines if the payback period is extended to 18 years? (The price to the customer, marginal production cost, and service pipeline cost remain the same as for the 9-year payback period.) (Answer with numbers only, two decimal places, unit: MWh/m.)
(NOTE: Do not take all numbers from Question 10, as linear heat density and payback period differ. Consider the relationship between payback period and linear heat density when price, marginal production cost, and service pipeline cost remain constant.)