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www.kensaheatpumps.com
Agenda
Introduction
Heat Pump Operation
Application
Design/MCS/ Pricing
Ground Arrays – unrolling and purging
Simple diagnostics and fault finding
Q&A, product viewing
Lunch
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4
Heat Pump Performance
The efficiency of a heat pump
is mainly governed by
the outlet temperature
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Heat Pump Efficiency
Real-life efficiency is expressed as a SPF (Seasonal Performance Factor) which is a very complex calculation and is influenced by numerous factors quite distinct from the heat pump performance.
Kensa’s heat pumps use Copeland scroll compressors, the most advanced available, and capable of providing the best available performance.
Branding of the heat pump is not the critical factor in determining performance. Factors linked to the property and the site are far more influential.
Ability to highlight the impact of some of these factors is helpful in gaining credibility with the client.
6
6
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Domestic Heat Pumps
R407C R134a
Size Compressor Size Compressor
4kW Single 3.5 kW Single
6kW Single 4.3kW Single
8kW Single 6kW Single
10kW Single 7kW Single
12kW Single 8.5kW Single
12kW Twin 10kW Single
16kW Twin 12kW Twin
20kW Twin 17kW Twin
24kW Twin 20kW Twin
30kW Twin
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Hybrid Heat Pumps
10
Single Phase Twin Compressor
R407C and R134a
15kW and 21kW
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Plant Room Modules
15
20 to 75 kW per module.
Combinations up to 1 MW and beyond
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Application
Application is critical
If a heat pump fails we can fix it, but if the application is wrong........
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Application - Exercise
Points to consider when installing a GSHP
i.e. Type of fuel replacing
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Application
How well insulated is the building?
What type of heating?
What fuel are we displacing?
Floor Construction.
Amount of glazing.
Noise issues.
Available heat source.
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Insulation
19
The better you insulate your building : - The lower the flow temperature required by the underfloor
heating system to reach your target temperature
Therefore, the less the heat pump has to raise the temperature
And the more efficient the heat pump!
The better you insulate your building, the more efficiently the heat pump will operate.
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The better insulated the building
20
Smaller the heat pump required
The less the digging/drilling required
Lower the capital cost
Lower the building’s carbon emissions
Lower the energy bill
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21
Heating Distribution Methods
Underfloor
Ideal, large emitting area therefore low input temperatures.
Beware floor coverings and method of installation which might require the heat pump to operate at higher temperatures.
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22
Heating Distribution Methods
Radiators
Need a higher temperature than underfloor due to the lower heat emitting area.
Might need oversized radiators as maximum temperature from the heat pump is approx. 50C.
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Mixing radiators and underfloor
23
Some want radiators upstairs, and underfloor downstairs
Can this be done?Yes
Depending on the floor construction, the temperature required by the radiators can be the same as the underfloor system!
There is a delay between the radiators and underfloor feeling warm.
Zone valves are generally required.
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Secondary Returns
26
Standard secondary returns cause the cylinder temperature to drop and due to the low temperature nature of heat pumps this temperature drop cannot be recovered
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DHW Cylinders
27
Single or Twin Coils(Coil designed and sized for Heat Pump applications)
3kW Immersion Heater
Expansion Vessel
G3 Kit
Stainless Steel tanks guaranteed for 25 years against leaks.
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Inverted houses
Bedrooms downstairs, living area upstairs.
Depends on floor construction.
Might need to run at higher temperatures and standard rate electricity.
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Glazing
Beware high areas of glazing.
(even triple glazing only retains 1/3rd of the heat a solid wall does)
Will be cool in winter when cold ambient conditions.
Additional heating such as log burners.
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Noise Issues
Keep the heat pump away from noise sensitive areas.
Similar noise to an oil fired boiler or running dishwasher.
Can install external to the building at the back of a garage or in a lean to.
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Buffer Vessels
Fitted to avoid short-cycling, i.e. which is where the heat generated during the minimum run time for the heating appliance (usually several minutes) cannot be absorbed by the buildings distribution system.
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Buffer Vessels2 connection buffer vessels are more efficient
If close control of all temperature zones is not required then ‘open’ zones of the underfloor can be used as the buffer vessel.
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Project Example – Sizing The Heat Pump
33
New Build Four Bedroom Detached Property with Garage
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Sizing
34
Internal area – Ground Floor & First Floor
Total Internal area = 224.6m2
Heat load =
224.6 x 40w/m (If New Build)
= 8984
= 8.98 kW