Are there any ways to overcome the limitations of natural ventilation such as unpredictable airflow and temperature differences? Is it more beneficial than not?
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Are there any ways to overcome the limitations of natural ventilation such as unpredictable airflow and temperature differences? Is it more beneficial than not?
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- Explain why the HVAC systems, new roof, interior renovation costs, additional plumbing, and restroom partitions have the same recovery life as the buildings.The sensible effectiveness of a heat recovery ventilator is 53.6%. The inlet temperature of fresh air is 35°C and relative humidity is 50%. The inlet temperature of exhaust air is 24°C and relative humidity is 60%. The mass flow rates of fresh air and exhaust air are 1.3 kg/s and 1.5 kg/s, respectively. Calculate the outlet fresh air temperature and estimate the energy saving ratio of adopting heat recovery ventilator.Pick the right combination of True Statements. 1. As the by-pass factor (BPF) of the cooling coil increases, temperature difference between air at the outlet of the coil and coil ADP decreases. 2. As the by-pass factor (BPF) of the cooling coil increases, temperature difference between air at the outlet of the coil and coil ADP increases. 3. During cooling and humidification process, the enthalpy of air may increase, decrease or remain constant depending upon the temperature of the wet surface. 4. During sensible cooling of air, dry bulb temperature decreases but wet bulb temperature remains constant 5. The sensible heat factor for a sensible heating process is 1.0
- Explain what a "heated zone" is, how it operates, and any potential restrictions.How has the evolution of boiler technology, from traditional steam boilers to modern high-efficiency condensing boilers and beyond, influenced industrial processes, energy efficiency, and environmental sustainability in various industries, and what are the key challenges and opportunities in adopting advanced boiler systems for a greener and more efficient future?"2. what do we need to ensure when it comes to sound and noise in the Hangar? 3. why do we need to control the temperature and humidity in the hangar? how does it affect our mechanics?
- A space to be conditioned has a sensible heat load of 80 kw and a latent heat load of 20 kw and is to be maintained at 20°C and 50% relative humidity. Outside air is at 35°C and 60% RH. The conditioned air will enter the space at 15°C. If 40% of the supply air is fresh and the rest is recirculated, the refrigeration capacity of the system is nearest to what value? 430 kw 455 kw 428 kw Ⓒ333 kwCalculate the EER rating of a 20 ton (240000 Btu) air conditioning unit with an average electrical load of 30 kW. An air conditioning plant supplies air to a room at a rate of 2.5 kg/s, the supply air being made up of equal parts by weight of outdoor and recirculated air. The mixed air passes through a cooler coil fitted with a by-pass duct, face and by pass dampers being used for humidity control. The air then passes through an after heater and supply fan. In a test on the plant, the following conditions (Table Qu 4) were recorded; 3 Table Qu. 4: Parameters recorded Relative humidity Dry bulb temperature °C Wet bulb temperature °C % Outdoor air 270 20.5 Room air 210 50 Supply air Air leaving cooler 160 11.8 80 90 coil Make neat sketches showing the plant arrangement and the psychrometric cycle and identify the corresponding points on both diagrams. Calculate the following; mass of air through the cooler coil load on cooler coil load on heaterThe weather station gives the following data for three cities in Egypt in Summer. Cairo 40°C DBT – 80% RH Alex 35°C DBT – 60% RH Aswan 48°C DBT – 30% RH What are the required processes in air conditioning device for each of them?