Presentation on theme: "Lecture Objectives: Continue with air-conditioning (psychrometric)"— Presentation transcript:
1 Lecture Objectives: Continue with air-conditioning (psychrometric) by looking into swimming pool examplehomework assignment problemsLook at the cooling side of air conditionsolve some problems related to the cooling system efficiency
2 Heat pump example A recreation center Heat Pump Ice Rink Swimming pool CondenserEvaporator85-89oF30oFConsumes heat energyRejects heat energyElectric powerfor a compressor
4 Evaporation Heat loss by evaporation: hm TpoolTairpoolW sW≈hmWsTpoolWairpoolDepends on the air speed and evenmore on the condition of the water surface(people splashing in the water)Further analysis can be conducted in the psychrometric chart
5 Air conditioning in Air Handling Units (AHU) Fresh(outdoor)airCoolingcoilHeating coildamperFan (pull)Fan (push)mixingRecirc.airFilterSwimming pool
14 Example A) Calculate the COP when: ambient temperature is 30ºC Cooling coil (CC) is 10ºCAssume that :condensation is 10ºC above ambient temperatureand evaporation is 10ºC below CC temperatureB)How much electricity you need to provide1 ton of cooling ?