System and method for heating and/or cooling at least one space

A system for heating and/or cooling at least one space, comprising

• a) a refrigeration circuit, comprising
• a first heat transfer fluid comprising or consisting of refrigerant,
• a compressor (1),
• at least one expansion device (2, 2′),
• a four-way reversible valve (3), and
• an outdoor heat exchanger (4) suitable for transferring heat between the first heat transfer fluid and outside air;
• b) a heat medium circuit, comprising
• a second heat transfer fluid comprising or consisting of water, at least one first phase change material (PCM1) and at least one second phase change material (PCM2), wherein the first phase change material and the second phase change material are encapsulated and wherein the first phase change material (PCM1) has a phase change temperature (PCM) which is lower than the phase change temperature of the second phase change material (PCM2),
• a first heat indoor exchanger (7) located in a first indoor space and suitable for transferring heat between the second heat transfer fluid and the first indoor space, and a first temperature sensor (5) configured to determine a temperature information of the first indoor space in which the first indoor heat exchanger (7) is located,
• a second indoor heat exchanger (7′) located in a second indoor space suitable for transferring heat between the second heat transfer fluid and the second indoor space, and a second temperature sensor (5′) configured to determine a temperature information of the second indoor space in which the second indoor heat exchanger (7′) is located, and
• at least one conveying means (6, 6′) for circulating the second heat transfer fluid through the first heat medium heat exchanger (7) and the second heat medium exchanger (7′);
• c) at least one heat exchanger (8, 8′) comprised by both the refrigeration circuit and the heat medium circuit, and being suitable for transferring heat between the first heat transfer fluid and the second heat transfer fluid;
• and
• d) a controller configured to receive a temperature information from at least the first temperature sensor (5) and the second temperature sensor (5′), wherein the controller is configured to control the system based on a temperature information received from at least the first temperature sensor (5) and the second temperature sensor (5′).