Kensa Heat Pumps Follow on training. Agenda Introduction Heat Pump Operation Application Design/MCS/ Pricing Ground Arrays.

Kensa Heat Pumps

Follow on training

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


Heat Pump Cycle

3


4

Heat Pump Performance

The efficiency of a heat pump

is mainly governed by

the outlet temperature


Heat Pump Performance

Inlet temperature also can have an affect on COP

5


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


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


Single Compressor internals


Twin Compressor Internals


Hybrid Heat Pumps

10

Single Phase Twin Compressor

R407C and R134a

15kW and 21kW


Shoebox Heat Pumps

11


Plant Room Modules

15

20 to 75 kW per module.

Combinations up to 1 MW and beyond


Application

Application is critical

If a heat pump fails we can fix it, but if the application is wrong........


Application - Exercise

Points to consider when installing a GSHP

i.e. Type of fuel replacing


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.


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.


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


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.


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.


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.


DHW Production

25


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


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.


Inverted houses

Bedrooms downstairs, living area upstairs.

Depends on floor construction.

Might need to run at higher temperatures and standard rate electricity.


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.


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.


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.


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.


Project Example – Sizing The Heat Pump

33

New Build Four Bedroom Detached Property with Garage


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


Budget Pricing


Budget Pricing


SAP Report - Line 37

Heat Loss Coefficient x Temperature Difference -2°C (Min) to 21°C (Max) = 23°C rise

378.45 x 23 = 8704W = 10kW (39W/m)

SAP sizing – Line 37!

Kensa Heat Pumps Follow on training. Agenda Introduction Heat Pump Operation Application Design/MCS/ Pricing Ground Arrays.

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