Heat transfer system

A heat transfer system comprising:

• a heating circuit having:
• a heat source configured to heat incoming heat transfer fluid;
• a heat emitter configured to consume heat from incoming heat transfer fluid for heating surroundings of the heat emitter;
• a feed conduit configured to, from the heat source to the heat emitter, carry heat transfer fluid having a first temperature, and
• a return conduit configured to, from the heat emitter to the heat source, carry heat transfer fluid having a second temperature, the second temperature being lower than the first temperature;
• a cooling circuit having:
• a heat extractor configured to extract heat from heat transfer fluid;
• a cooler configured to absorb heat from its surroundings in order to cool the soundings of the cooler by transferring absorbed heat to heat transfer fluid,
• a feed conduit configured to, from the heat extractor to the cooler, carry heat transfer fluid having a third temperature, and
• a return conduit configured to, from the cooler to the heat extractor, carry heat transfer fluid having a fourth temperature, the fourth temperature being higher than the third temperature;
• and
• a heat pump having:
• a first heat exchanger having a first circuit for circulating heat transfer fluid and a second circuit for circulating heat transfer fluid, wherein the first circuit has an inlet and an outlet connected to the cooling circuit, wherein the inlet of the first circuit is connected to the return conduit of the cooling circuit,
• a second heat exchanger having a third circuit for circulating heat transfer fluid and a fourth circuit for circulating heat transfer fluid, wherein the fourth circuit has an inlet and an outlet connected to the heating circuit,
• wherein the second circuit and the third circuit is a common circuit of the first and second heat exchangers;
• wherein the fourth temperature is lower than the second temperature.