HEAT PUMP FOR DHW, OTHER DEVICE FOR HEATING
Main characteristic of the concept
One heat pump system for DHW, separate heat generator (fossil, biomass, electric, …) for space heating.
Heat distribution and temperatures levels
Separate production of space heating and DHW. Temperature level of the space heating system is not relevant for the heat pump.
Size of building, number of apartments
This solution is suitable for all sizes of buildings with the preference for smaller ones. Using specific heat source or refrigerant (for example CO2) may be an indicator to select this solution.
DHW and storage characteristic
Heat pump provides DHW only. Consequently, appropriate high temperature level is necessary. Storage tanks are necessary for providing of DHW by the heat pump. In cold climates a two-stage HP might be necessary.
Energy standard, insulation level
This solution is generally not to be recommended for new buildings due to use of fossil energy sources. Using a heat pump for DHW can only be practicable by retrofitting if existing system consists of two heat generators and the investor wants to exchange only one.
Complexity of installation
In case of retrofitting, exchanging one mode at a time may reduce the complexity of the planned construction work.
Heat Sources
All heat sources generally possible. For this solution some less frequently used heat sources like exhaust air or unglazed solar collectors can be used.
Specific issues of the concept
In case of retrofitting this solution allows exchange of only one heat generator and adopt a complete “heat pump only” solution at a second step.
Positive aspects
- Option for large and old MFB with no possibility for reduction of heating demand
Negative aspects
- High distribution losses
- Partial use of fossil fuel