Upload
tweedgreen
View
223
Download
0
Embed Size (px)
Citation preview
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
1/23
On Site Generation
1
Ground & Air Source
Heat Pumps
Copyright On Site Generation Ltd. Feb 2011Not to be copied without specific prior permission
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
2/23
On Site Generation
What are they / howdo they work?
Different types
Heat Pumps
as c sys em es gnrequirements
Costs and savings
( and CO2)
2
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
3/23
On Site Generation
Background
A fridge is a heat pump
Heat sources ground, water,air, exhaust air
Solar energy not geothermalenergy
Very efficient form of electricheating
Best for well insulatedproperties
3
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
4/23
On Site Generation
How heat pumps work
4Source: Dimplex
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
5/23
On Site Generation
Heat pump efficiency
Coefficient of Performance is the ratio of
Energy in : Energy out
CoP typically 2.5 5
7
Improves with higher heatsource temperature
Improves with lower heat
distribution temperature ie minimise the
temperature increase of
the system
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
6/23
On Site Generation
Ground / water source heat pumps
Source: Danfoss heat pumps 6
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
7/23
On Site Generation
Boreholes
Boreholes are generally 125mm in diameter, wide
enough to install two HDPE pipes 40mm in diameterwith a weighted U bend
7
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
8/23
On Site Generation
Drilling video
Danfoss video
8
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
9/23
On Site Generation
Trenched ground loop
The trenches should be 1m apart and 1-2m deep.
9
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
10/23
On Site Generation
Air source heat pumps
Source: Danfoss heat pumps 10
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
11/23
On Site Generation
ASHP 14 kW
11
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
12/23
On Site Generation
ASHP 8.5 kW
12
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
13/23
On Site Generation
ASHP Location
Noise from the fan therefore avoid close neighbours /bedroom walls etc
Manufacturers will have requirements for margins.....
13Source: Mitsubishi
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
14/23
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
15/23
On Site Generation
Design and sizing
Heat pump should be designed to heat loss ofbuilding
New buildings will have SAP calculations or heat loss
Existing buildings use existing consumption of fuel
for heating or calculate heat loss (RdSAP modelling)
A rule of thumb : existing properties have a heat loss of 50-60 Watts per m2 offloor area
- new build 30-35 Watts per m2 of floor area15
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
16/23
On Site Generation
Heat loss estimation
16
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
17/23
On Site Generation
Underfloor heating provides a large surface area forlow temperature heat transfer
Radiator sizes need to be increased for lower flow- -
Heating system selection
. .
17
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
18/23
On Site Generation
Renewable Heat Incentive
Proposed Tariff Tariff lifetime
Details of scheme to be confirmed
Proposed tariff rates (likely to change):
(pence/kWh) (years)
GSHP < 45 7p 23
ASHP < 45 7.5p 18
18
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
19/23
On Site Generation
Typical ASHP 8.5 kW
Approx. 7,500 installed cost Anticipated space / water heating requirement ~ 15,000 kWh / year
Expected energy input to ASHP ~ 5,000 kWh / year (COP = 3)
19
System Annual FuelCost
CO2 Emissions
ASHP 600 2.7 tonnes
Gas Boiler 660 2.8 tonnes
Oil Boiler 900 4 tonnes
Electric Heating 1,800 8 tonnes
Note: Assumes electricity @ 12p/kWh , gas @ 4p/kWh and oil @ 6p/kWh
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
20/23
On Site Generation
Typical GSHP 12 kW
Approx. 15,000 (trenched ground loop)
Approx. 20,000 (borehole installed ground loop)
Space / water heating requirement ~ 30,000 kWh / year
Expected energy input to GSHP ~ 7,500 kWh / year (COP = 4)
20
System Annual FuelCost
CO2 Emissions
GSHP 900 4 tonnes
Gas Boiler 1,320 5.5 tonnes
Oil Boiler 1,980 8 tonnes
Electric Heating 3,600 16 tonnes
Note: Assumes electricity @ 12p/kWh , gas @ 4p/kWh and oil @ 6p/kWh
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
21/23
On Site Generation
Maintenance
Heat pumps require minimal maintenance
Annual service, couple of hours ~ 200
21
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
22/23
On Site Generation
Planning and Building Control
GSHPs are permitted development. ASHPs require planning permission due to concerns
over noise from the fan.
A building warrant may be required for the heat pumpinstallation
22
8/7/2019 On Site Generation - Heat Pump Presentation Feb11
23/23
On Site Generation
Considerations
Is the house well insulated? Space for ground loop / outdoor unit
Radiators vs. underfloor heating
What are the alternatives (gas, oil etc)?
23