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Shandwick Street, Glasgow

Shandwick Street, Glasgow

Solar PV feasibility study for modern homes in the Kildermorie area of Easterhouse, Glasgow

Overview

Easthall Park Housing Co-operative (EHPH) wanted to examine the possibility of installing solar photovoltaic panels (PVs) to approximately 100 homes in the Greater Easterhouse area of Glasgow, including these properties in Shandwick Street. The benefits of this technology would be reduced electricity costs for their tenants, thus tackling fuel poverty, and reduced CO­2 emissions.

The Scottish Energy Centre, part of the Institute of Sustainable Construction at Edinburgh Napier University were asked to undertake a feasibility study. The study considered the location and types of PV panels to maximise solar gain; how PV might link with energy saving measures; and the benefits of feed in tariff (FIT) that might be realised.

Approach

The Easterhouse area of Glasgow is a post-war suburb located to the east of the city. Construction began in the area in the mid 1950’s. Easthall Park Housing Co-operative (EHPH) is a fully mutual housing co-op and a not for profit Registered Social Landlord (RSL).

Scottish Energy Centre conducted an initial survey of the whole housing stock in the study area. A design tool, PVSyst, was used to establish the economic and technical feasibility of PV installations. For further information on PV systems, please see section 3 in the full case study (download on the right).

The tool needs the following information to obtain accurate results:

  • Tilt of pitched roof
  • Orientation of roof
  • The amount of output power required
  • The type of PV panels to be used

 

Other considerations include potential shading of the PV panels, FIT restraints and possible issues with grid connections.

Performance

The timber framed property on Shandwick Street is in the Kildermorie area of Easterhouse. It is a semi-detached two-storey house. Energy consumption has been estimated to be in the region of 4,200kWh/year.

The rear roof area of the property faces -15° southeast and pitched 40° from the horizontal. The available area for locating solar panels is 39.44m², which accounts for an area at the perimeter which potentially could be shaded due to the roof of the adjacent property.

 

Three PV system options were explored.

 

Option 1

Option 2

Option 3

Solar Panel Technology

Monocrystalline

Polycrystalline

Monocrystalline

Number of Modules

13

16

14

Power (wp) per module

240

190

250

Total Power (kW)

2.8

2.7

3.2

Number of inverters

1

1

1

Size

3kW

3kW

3.8kW

Strings

1 x 13

1 x 16

1 x 14

Produced Energy (kWh/yr)

2,376

2,301

2,599

Specific Production (kWh/kWp/year)

761

757

743

 

The preferred solution is Option 3. The modules would cover the roof with the exception of the area which is likely to be shaded.

There is a high capital cost for the installation but the payback is expected within 12 years. An estimated profit of £40,000 is estimated for the end of the 25 years FIT period.  

Lessons

Electricity demand for the study was estimated in lieu of accurate figures being available. If considering a PV installation, accurate figures would be required to ensure the system is appropriately sized.  

The study highlights the essential constraints that must be considered in solar PV design –

  • physical constraints: roof size, orientation and tilt;
  • financial constraints: FIT provision; and
  • environmental constraints: shading.

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Case Study

Download this case study (1.61 Mb)