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Economic Performance Assessment of Three Renovated Multi-Family Houses with Different HVAC Systems
Dalarna University, School of Technology and Business Studies, Energy Technology.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Since the building sector is responsible for 40% of the energy consumption and 36% of

CO2 emissions in the EU, the reduction of energy use has become a priority in this sector.

The EU has adopted several policies to improve energy efficiency. One of these policies

aims to achieve energy efficient renovations in at least 3% of buildings owned and

occupied by governments annually. In Sweden, a large part of existing buildings was built

between 1965 and 1974, a period commonly referred to as ‘miljonprogrammet’. Stora

Tunabyggen AB, the public housing company in Borlänge municipality, begun a

renovation project in the Tjärna Ängar neighborhood within the municipality with the

greatest share of its buildings stock from this period. The pilot project started in 2015. The

aim of this project was to renovate three buildings with similar measures, that is, by

adding 150 mm attic insulation, replacing windows with higher performing ones (U-value

1 W/m

²K), by adding 50 mm of insulation to the infill walls and by the installation of flowreducing

taps. The essential difference between the three renovation packages is the

HVAC systems. The selected HVAC systems are (1) exhaust air heat pump, (2) mechanical

ventilation with heat recovery and (3) exhaust ventilation. Life cycle cost analysis was

conducted for the three building and sensitivity analysis for different values of discount

rate and energy price escalation was performed. The study found that the house with

exhaust ventilation has the lowest life cycle cost and the highest energy cost. The house

with exhaust air heat pump has 3% higher life cycle cost and 18% lower energy use at 3%

discount rate and 3% energy price escalation. The study found that mechanical ventilation

with heat recovery is not profitable, although it saves energy. The sensitivity analysis has

shown that the possible increment of price energy and lower discount rate give higher

value for the future costs in life cycle cost analysis. This lead to the main finding of this

thesis, which is that exhaust air heat pump is the best choice for the owner according to

the available data and the assessed parameters.

Place, publisher, year, edition, pages
2018.
Keywords [en]
HVAC systems, economic assessment, air heat pump, mechanical heat recovery, LCCA, life cycle cost analysis, miljonprogrammet.
Keywords [sv]
HVAC systems, economic assessment, air heat pump, mechanical heat recovery, LCCA, life cycle cost analysis, miljonprogrammet.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:du-29076OAI: oai:DiVA.org:du-29076DiVA, id: diva2:1270343
Available from: 2018-12-13 Created: 2018-12-13

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • nn-NB
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  • Other locale
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