In its use, reefer containers require a lot of energy to operate to cool the cargo inside. Because the cooling system in the reefer container must operate continuously to maintain the temperature in the container. To reduce the operation of the cooling system, reefer containers are equipped with PCM (phase change material) as thermal energy storage which can store heat energy longer to create a lag time for the operation of the cooling system. In previous research, the use of PCM in cold storage can save the cost of using cold storage. From this research, the use of PCM in reefer containers was developed. The eutectic mixture used as PCM is NaCl-H2O with additional ingredients is propylene glycol. Before being applied to the reefer container, the mixture was tested using the cooling chamber methods to determine its thermophysics. The presence of additives in the PCM eutectic mixture is expected to reduce the supercooling phenomenon, reduce corrosive properties and increase the use of PCM based on NaCl-H2O.

The objective of this study was to analyze the factor of COVID-19 and environmental factors that affect the delay of building construction. The construction of the BPKB Service Building for the Traffic Directorate of the Maluku Regional Police in T.A 2020 was a project that spends a very large budget with a planned time of 150 days. Building construction was delayed up to 4 weeks. This building construction experienced a delay of 27.895\% of the work that had to be done. The method used is principal component analysis, which is multivariate and transforms correlated original variables into new uncorrelated variables by reducing the number of these variables so that they have smaller dimensions but can explain most of the diversity of the original variables. The results of the analysis of 25 respondents and 3 variables, namely: building tents to anticipate rain, good and harmonious relationships to prevent unexpected things from happening, and checking the location before making soft drawings.