TECHNICAL FEATURE TABLE 4 The MMEU component parameters. PARAMETER VALUE PARAMETER PV PANELS VALUE BATTERY Slope of Surface 0° Azimuth of Surface Facing South Short-Circuit Current (Reference Conditions) 9.63 A Open-Circuit Voltage (Reference Conditions) 40.69 V Voltage at Max Power Point (Reference Condition) 33.21 V Current at Max Power Point (Reference Condition) Cell Energy Capacity 200 Ah Cells in Parallel 2 Cells in Series 6 Charging Efficiency 0.92 9.23 A Max. Current Per Cell Charging 100 A Temperature Coefficient of Isc (Reference Condition) 0.00443 A/K Max. Current Per Cell Discharge -200 A Temperature coefficient of Voc (Reference Condition) -0.141 V/K Max. Charge Voltage Per Cell 2.8 V Number of Cells Wired In Series 60 Module Temperature at Nominal Operating Cell Temperature 46 Regulator Efficiency 0.98 Module Area 1.46 m2 Inverter Efficiency (dc to ac) 0.94 Number of Modules in Series 2 Inverter Efficiency (ac to dc) 0.94 Number of Modules in Parallel 4 High Limit on Fractional State of Charge (FSOC) 100% -20°C Outside Dry-Bulb Temperature (DBT) Heating Capacity 3.52 kW Low Limit on FSOC 0% 5°C Intake DBT Heating Power 1.76 kW Charge to Discharge Limit on FSOC 0% 29°C Outside DBT Total Cooling Capacity 3.50 kW Inverter Output Power Capacity 2400 W 22°C Intake DBT Cooling Power 0.95 kW Current for Grid Charging of Battery 100 A Upper Limit on FSOC for Grid Charging 100% INVERTER HEAT PUMP AIR-TO-AIR HEAT RECOVERY DEVICE DIESEL GENERATOR Heat Recovery Sensible Effectiveness 0.797 Heat Recovery Latent Effectiveness 0.889 Rated Power 2.0 kW Ventilation Flow Rate 350 m3 /h Max Power 2.4 kW Ventilation Fan Total Power 150 W Min Power 0.6 kW FIGURE 3 Geometrical model of the tent. FIGURE 4 Schematic of the Case B system. Inverter D 5m 4m Results Model simulations were made for climate conditions during three time periods: winter (Dec. 1 to Feb. 28), spring (March 1 to May 31) and autumn (Sept. 1 to Nov. 30) 42 ASHRAE JOURNAL Diesel Generator Fan ashrae.org APRI L 2021 Indoor Outdoor 2.3 m Battery Electric Heater Shelter for Riga, Latvia, EU, with a calculation step of 20 seconds. According to Table 5, using the MMEU (Case A) reduces the total electricity consumption by 76% to 81% because of using an air-to-air heat recovery device and heat pump. The diesel generator produces more electricityhttp://www.ashrae.org