Space Heating
	With Heat Pumps from OCHSNER you create for yourself without doubt the optimal indoor climate: Low-temperature radiant heat, where the body needs it, because well-being, quality of life and health are priceless goods.

A Heat Pump heating system consists of a heat source (water, ground or air), the Heat Pump and the heat transfer system (e.g. under-floor heating).

All components must be designed to optimally interact in order to ensure highest performance and reliable operation. Therefore OCHSNER plans the entire Heat Pump heating system. Our System Partners will be happy to help you with their expertise to find the best suitable solution for your personal requirements.
 

> brochure heating (PDF-Formate)

The Golf series ^®

OCHSNER presents the new gerneration Golf: The successful models Golf Midi and Golf Maxi represent the completely revised series for heating capacities up to 30 kW. The models are known for their high efficiency and extremely quiet running with the lowest noise-level on the market. This is of extreme ipmportance, as heat pumps are more frequently installed in a storage area or utility room on the ground floor as opposed to a cellar or basement. The quiet running is obtained by the new double L frame design among other design features.

What else does the new generation Golf offer?

• COP. High coefficient of performance guarantees lowest operating costs.
• Design. The elegant design is impressive. Clear lines and modern styling.
• Functionality. The control panel is positioned and located for easy access. This allows comfortable reading of the display and ergonomic operation of the comfort-control in pleasant body attitude.
• Structure. The elegant and functional structure continues inside the unit and provides quick access to all inner components .
• Option hot water production. The Golf Maxi offers integrated sanitary water heating with refrigerant heat exchanger and hot water loading pump. The Golf Midi is equipped with optional 3-way-valve for hot sanitary water production with an external coil or water to water heat exchanger.
• Space-saving. The Golf Midi fits almost anywhere with its 400 mm width.
• Professional performance. In all details the professional design and the "step lead" of OCHSNER technology can be seen.
• Extremely quiet running. Using Scroll compressors and triple flexible mounting, new sound-absorbing lining, self-supporting lining from solid burn-painted seel sheet..
   

Floor or wall heating

Radiant heat is the healthiest form of heating. The larger the heating surface, the lower the temperature of the radiant heat, the gentler the heat emission and the more comfortable we feel. Using radiant heat you have the same level of comfort with an air temperature inside the room which is 2 centigrades lower compared with heat generated by radiators. And reducing the room temperature by about 2 °C saves up to 10 % of heating costs per year.

What Heat Source to use

Tip: The heat source with the highest temperature level brings the highest coefficient of performance and thus lowest heating costs.
 

Water

If groundwater is available at reasonable depth and temperature, then you can achieve the highest COP. A constant temperature from + 8 °C to + 12 °C guarantees an optimal heating source. The groundwater is pumped from the delivery well to the heat pump and from there 15 meters to the sink well. If groundwater is not available, the second best heat source ist soil.

Earth coupled systems

Horizontal earth collectors use about 98 % solar heat stored in the ground. The soil temperature stays at a considerably high level of temperature even during very cold winter days, enough to heat your home. There are different ways to use the energy from the soil:

Horizontal collectors are located around 1,2 meters deept. They consist of tube-circuits in which a heat transfer medium circulates acting as a heat transport from the ground to the heat pump.

Depending on the heat transporting medium you can use systems with brine or with refrigerant, latter referred to as direct expansion system.

With the brine system the brine circulates either in horizontal collector tubes, or in trenches or in earth taps around 100 m deep. Flat collectors will be used if there is enough flat space (garden surface). This system needs the lowest investment costs. You will need an area of 1 to 1,5 times the area inside the house to be heated. The trench collector from Ochsner needs less space. Earth taps are the solution where you have practically no space available. They are drilled about 100 m deep and use a good portion of geothermal energy.

 For some heat sources you will need an authorisation.
 

 Air

If groundwaters or soil cannot be used, air as a heat source is available anywhere. Also particularly suitably for the retrofit or combined operation with a second heat source. Thanks to the integrated standard defrosting system the heat pump also operates as low as - 18 °C ambient temperature. OCHSNER recommends split units which offer several advantages: Installation of the heat pump well protected inside the house and mounting of the evaporator outside. Advantages: no air ducts, very quiet operation due to low speed fans with low power consumption, long operating life and more economical.

How to select the right heat pump system

Determining the required heating capacity

With heat pumps, exact dimensioning is important, because oversized systems cause excessive costs and operate with lower efficiency. The determination of the heat requirement is made accdording to the individual country standards in Germany (DIN 4701), Austria (OENORM 7500 (B 8135)) and Switzerland (IA 380-1, SIA 384-2).

The heat requirement is indicated in kW. The following values are expected approximate figures (heat requirement W/m²):

• Old building with appropriate thermal insulation: 75 W/m²
• New building with good thermal insulation: 50 W/m²
• Low-energy building: 30 W/m²

The specific heat requirement (W/m²) per heated floor space is multiplied by the m² and results in the entire heat requirement (transmission and ventilation heat requirement).

The yearly heating requirement in kWh per annum gives an amount of how much heating energy (heat) is required during the heating period. This figure has to be remembered when determining the size of a ground coupled system.
 

Electric cut off times

Utilities often offer a reduced price for electricity for a heat pump. Thus they reserve the right to interrupt the supply at certain periods of the day. The current supply can be interrupted for example 3 x 2 hours withing 24 hours. Therefore the daily requirement of heat must be produced within that time, in which the heat pump can operate.

Example: Theoretical interruption 3 times 2 hours; calculated heat requirement withour cuts 9 kW. Maximum cut 3 x 2 hours = 6 hours. That results in 18 hours of availability.

Theoretical heat requirement with 6 hours of cut:

9 kW x 24h/18h = 12 kW (i.e. 33% surcharge)

Tip: The calculation of the heat requirement includes the lowest possible temperature which in reality barely happens. Also the rooms in a house are barely fully all heated at the same time. Therefore in practice a minor multiplier of approx. 20 % has been proven as sufficient, especially with underfloor heating: e.g. 9 kW x 1.2 = 10.8 kW.
 

Heating flow temperature

The name of the game is: The lower the heating-system-temperature, the higher the coefficient of performance (multiplier) of the heat pump and the lower the heating costs. In order to achieve this, a wide surface of the heating elements have to be selected. Ideally for low-temperature under-floor heating and wall heating 35 °C flow-temperature is used. Furthermore low temperature radiant heat guarantees maximum comfort.

With conventional radiator heating, a flow temperature of max. 55 °C inlet temperature should be chosen.

For retrofit - linlet temperatures from 55 °C to 65 °C are acceptable. OCHSNER has developed the "plus"-series (renovation, radiator heating) for this special application. More details can be found under

"retrofit"
 

Mode of operation

The following modes of operation are possible:

• monovalent: The heat pump is the only heat source. It provides 100 % of the heat requirement. Usually with water or ground heat source coupled system.
• bivalent parallel monoenergetic: The heat pump provides approx. 90 % of the yearly heating lot. The electric heating tap operates only if required (at very low ambient temperatures to provide peak heat requirement together with the heat pump). Usually with new buildings with air heat source.
• bivalent alternative: The heat pump operates to a certain minimum ambient / maximum flow temperature. Above this a second heat source, furnace takes full load. This system is used for retrofit with old high temperature radiator systems.
   

Hot water with the Heatpump

If one does not select an individual Multi-functional Sanitary Hot Water Heat Pump (Europa) for the water heating from exhaust air, heating the water with the heating heat pump is recommended. As a rule of thumb one should plan an additional heating capacity of approx. 0,25 kW per person. OCHSNER offers several efficient solutions, which depending on the heat pump type and heating system, can be used effectively.  

Which Type to choose

As soon as the heat source is determined (check temperature rise), the heat requirement and the maximum flow temperature of the heating system, the appropriate heat pump type can be selected from the basic performance data sheet.

> performance data > brochure heating (PDF-Formate)
 

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