Supermarket application. CO2 all-in-one transcritical energy pack for HVAC&R integration in small store. Data analysis.

Today the trend for buildings in EU is getting closer to the n-ZEB (nearly - Zero Energy Building). This means that refrigeration is becoming, year after year, one of the most important and one of the last thermal loads in food retail shops. Refrigeration systems are most usually standalone systems that sometimes have secondary connections to other systems. These connections consist, in most cases, of passive heat recovery based on heat exchangers. This paper presents the results of an energy pack consisting of an all-in-one R744 trans-critical device for supermarket application actively producing on demand thermal power for heating, cooling and refrigeration. The energy pack consists of an R744 transcritical system able to modify independently three pressure levels in order to satisfy the whole thermal demand of the store. The aim of the study is to understand how much the all-in-one solution helps to achieve the efficient use of R744 for refrigeration in a small format food store. This paper analyzes a collection of data coming from a real store installed in UK. The results of the analysis are coupling with the results obtained with a full-size prototype running in a facility laboratory, in order to extend the analysis with different combinations of temperature, power and load displacement.