Renovating your heating system
	After the third oil shock the demand for Heat Pump systems for retrofit into existing buildings rose enormously. Existing heating systems because they operate unefficiently and uneconomically or pollute our environment, are being replaced ever more frequently.

The constantly rising fuel prices result in the heating costs with conventional systems exploding out of control. The remedy is to retrofit a Heat Pump. In particular with older boilers it is beneficial and wise to change to a Heat Pump. Whem modernizing your heating don't take an outdated technology but change to a future-proof system. Also the exchange is a decision for many years.
 

Roles and laws to exchange old heating systems

In Germany alone there are 1.6 million existing heating systems to be exchanged due to federal Emmissions Directive (BlmSchV) before 2004. Be proactive before you are obligated to do so.

Competence is needed

Only a competent, specialized and experienced installer should retrofit a Heat Pump. This is because the technical requirements are higher in this case compared to an initial installation. The old heating system must be analyzed professionally and converted if necessary. OCHSNER is thereby a competent partner with the special experience, know how and a suitable product range.
 

Products

OCHSNER took action on time and produces its heat pumps with a special advanced technology up to 20 kW heating output as series "plus" serially for 65°C flow temperature and for all heat sources.

Safety

The refrigerant R 407C is used in the series "plus". It is a safety refrigerant, which is absolutely non-toxic, free from chlorine and non flammable.
Because of the usage of this safety refrigerant in each case a heat pump can be retrofitted without taking care of special safety measures, as they are necessary for flammable refrigerants.

Heat Source Air: Perfect for Retrofitting

It is often not possible to use the heat sources earth and water when a heat pump should be retrofitted. OCHSNER has developed especially for this case and for retrofitting two series of air to water heat pumps.
A new technology and very large dimensioned evaporators (efficient absorption of the heat in the surrounding air even at very low outside temperatures) allow that even with outside air high coefficients of performance are achieved. External tests at the heat pump test center WPZ in Buchs (Switzerland) confirm that benchmarks are set.
Moreover OCHSNER as the heat pump specialist offers a new technology which enables a flow temperature up to 65°C even at very low outside temperatures – the perfect appliance for retrofitting.

Finally heat pumps can be applied everywhere efficiently.

Air to Water Heat Pumps by OCHSNER

Air to water heat pumps from OCHSNER are available in two versions: in the Split-Design within the "Golf" series and as compact appliance "Air-Station".

The air to water heat pump of the Golf series is produced in the approved Split-Design:

The heat pump, as the high-valued equipment including electronic controls, is placed easily accessible inside the house and thus protected against weather, while the split-evaporator for capturing energy from the outside air is placed outside the building thus avoiding heat transfer losses or noise. For the connection only two finger-thick copper-pipes and an electrical cable are necessary. The drilling can be made easily and without problems through any wall.  

That saves expensive and loud air ducts as well as exhaust constructions, which would be necessary with conventional indoor mounted air to water heat pumps. The evaporator unit causes almost no noise, as special low speed fans are used in the outside mounted units. Compared to conventional heat pumps for external installation the split unit avoids heat transfer losses and does not expose the complete unit to wind and weather.

OCHSNER also offers compact air to water heat pumps for indoor or outdoor installation: the "Air-Station".

> performance data series retrofit heat pumps
 

Determination of the heating requirement

With Heat Pumps a precise dimensioning is particularly important: Oversized systems cause disproportionately high initial cost and operate with a lower efficiency (COP).

The following values are to be expected according to experience, building standards and geographic location (heating requirement W/m²):

• Old buildings: 75 W/m²
• Newer buildings with contemporal insulation (see German WSVO 95): 50 W/m²
• Low-energy standard: 30 W/m²

Then you multiply the specific heat requirement (W/m²) by the floor space and get the resultant entire heat requirement.

The heat requirement for existing buildings can also be calculated by taking the annual oil or gas fuel consumption and applying the following formular:

• Q (kW) = oil consumption (I/a) / 250
• Q (kW) = gas consumption (m³/a) / 250

The factor 250 results from the heat value, the hours of operation and the average achieved plant efficiency.

Evaluation of the existing heat distribution system and checking Heat Pump compliance by a specialist often results in the conclusion that the system is suitable for using a Heat Pump. Typically /the pipes and radiators have been designed overdimensioned which helps to get the required flow rate and flow temperature.

The following data has to be taken and/or calculated: :
- Heat requirement before and/or after the thermal insulation
- Maximum needed flow inlet temperature for heating up period
- Dimensions of the pipework
   

© OCHSNER Wärmepumpen GmbH