Energy efficiency measures - Institutional - Building envelope - Schedule - School / Slovakia

Case study assignment

A school building and adjoining caretaker flat are connected to a district heating system from which the school purchases heat. There is no provision to separate the heating loads. As a result, the school has to be fully heated during unoccupied hours and on weekends when not in use.

Base case

Heating system

• Space heating temperature is 20 ºC, building heated 24 h/d
• Heating change over temperature is 16 ºC
• Fuel rate is 585 SKK/GJ

Building envelope

• North side of buildings face due north
• There is no solar shading of the windows

• Building volume: School 11,500 m³, caretaker's flat 300 m³
• Air infiltration: 1.5 air change per hour
• District energy company provides following fuel emissions figures:
  • CO2: 77.8571 kg/GJ
  • CH4: 0.0057 kg/GJ
  • N2O: 0.0014 kg/GJ

Proposed case

• Lower set point temperature for heating by 2 ºC when school not occupied on weekends and for 12 hours each weekday
• Cost associated with heating schedule changes is 600,000 SKK

Prepare a RETScreen study, documenting any assumptions that you are required to make, and report on the significant conclusions from this analysis.

Solution

The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.

Similar project

In 2004 in Sala, Slovakia, energy audits on two schools heated by district heating systems suggested disconnection of the caretakers' flats from the schools' heating systems and installation of automated heating controls to allow lower temperatures in the school buildings during unoccupied hours.

Real project (35 KB)