V sup: Supply airflow rate (m³/s) Vret : Exhaust airflow rate (m³/s) To Air-to-air heat recovery system Ve exf: Exfiltration (m³/s) Tret Exhaust air temperature (°C) Tsup Supply air temperature (°C) T : Zone temperature (°C) To : Outdoor air temperature (°C) Exhaust air fan Vret Θ T sup Supply air fan Heating coil Tret Zone T: Vexf
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- 20 stages of MSF-M with the following main parameters: intake: 1500 kg/s, 35,000 ppm, 20 C; blow down brine: 38 C, 69,000 ppm recycle brine about 79% of blow down brine steam supplied to brine heater: 2kg/s, 115 C The top brine temperature : 100 C performance ratio: 8.5 calculate all the characteristics of the system for first stage (x, tin, tout, Tin, Tout, Mdi, Mbi, TVi, Ai, Ab and the width and the length1. Using the Steam Tables, determine the heat absorbed by the boiler (KW) and Wsf when subcooled water at pressure = 5 Mpaa (subcooled by 64 deg C measured at the boiler inlet), is superheated to 100 degrees SH at the same pressure. Flow rate is at 10 cubic meters per minute. Ans.: a) Qa = b)Wsf= Hint: Use v at compressed water temp. at boiler inlet to convert to mass flow rate. Process is isobaric (Constant Pressure, where Q=m x AH).E 01 Image Word 1/1 Using PV & TS Diagrams derive the formulae of a. Temperature, Pressure & Volume c. Change of Enthalpy e. Change of Entropy g. Work steady-flow of the following processes; 1. Isopiestic, 2. Isochoric, 3. Isothermal, 4. Adiabatic, 5.General Polytropic b. Heat addedrejected d. Change of Internal Energy f. Work non-flow Tap to view in full-screen OCR Rotate Markup Extract Text Signature Note
- A summer air-conditioning shown below is required to maintain a certain room at specified conditions. The layout of the system is indicated on the next page and the specifications are listed below.System specifications:Required room temperature: 23⁰C, 50% Relative humidityAtmospheric pressure: 101 kPaOutside air conditions: 30⁰C, 80% Relative humiditySensible heat gain: 5 kWLatent heat gain: 4 kWTemperature rise across fan: 1.5⁰CTemperature of air leaving cooler: 12⁰CTemperature of air entering room: 18⁰CApparatus dew point of cooler: 7⁰C Draw the processes on a psychrometric chart and determine the following: 1.The ratio of mass flow rate of re-circulated air to the mass flow rate of air supplied to the room. 2.The heat removed by the cooling coil.3.The heat supplied in the re-heating coil. 4.The cooling coil bypass factor.A summer air-conditioning shown below is required to maintain a certain room at specified conditions. The layout of the system is indicated on the next page and the specifications are listed below.System specifications:Required room temperature: 23⁰C, 50% Relative humidityAtmospheric pressure: 101 kPaOutside air conditions: 30⁰C, 80% Relative humidity Sensible heat gain: 5 kWLatent heat gain: 4 kWTemperature rise across fan: 1.5⁰CTemperature of air leaving cooler: 12⁰CTemperature of air entering room: 18⁰CApparatus dew point of cooler: 7⁰CExample 2: The following data apply to an air-conditioning system RSH=11.6 kW RLH=11.6 Kw In side condition 25°C & RH=50% & outside condition 35°C DBT & 27.8°C WBT Return air from the room is mixed with the outside air before entering the cooling coil a ratio 4:1 Return air from the room is mixed with the air leaving the cooling coil at a ratio 1:4, cooling coil by pass factor =0.1. The air may be reheated if necessary before suppling the condition, assume tdp=10°C. find 1- Supply air condition to the room 2- Refrigeration load (Colling coil load) 3- Total refrigeration capacity d- The quantity of fresh air supplied
- 3:57 A Done lecture 7_b5ee35c08478147bb8a3744a... Lec. (7) tar -Dry bulb temperature O Example (1): An air conditioning equipment (figure) have the following: - Supply air mass-1.26 kg/s. The cooling coil receives 20 % outdoor air and 80% return air. tdz Fig. 18.14. Representation of supply air condition and room design condition. 0.252 kg/s Refrigeration and A/C - Outdoor air conditions are: 28°C db, 19.5°C wb Return air conditions are: 22°C db, 50% RH. The mixture air condition outlet the cooling coil are: 10°C db, 0.00735 kg/kgda Draw the system on the Psychrometric chart, then calculate: 1. Cooling coil load. 2. Room sensible heat. 3. Room latent heat. 4. Fresh (outdoor) load. 5. Duct and fan heat gain 6. Sensible heat ratio SHR. If the supply air temperature increases with a value 1°K due to fan motor heat gain and 2°K due to duct heat gain. . ← 1.008 kg/s R to Dr. Omar M. Ali LTE الغرفة المراد تكييفها (22,50 %) 1.26 kg/s R Grand Sensible Heat Factor It is defined as the ratio of…During a test run of an ammonia refrigerating cycle test data are as follows: Suction pressure = 250 kPa Condenser pressure = 1250 kPa %3D Refrigerating capacity = 30 kW %3D Compressor clearance 5% Compression efficiency = 80% Mechanical efficiency = 75% Actual volumetric efficiency = 74% %3D k = 1.3 Calculate the following: 1. Volumetric efficiency 2. The ideal and actual COP 3. The brake work of the compressorAn air conditioning system is designed under the following conditions Outdoor conditions; 30°C dbt, 75% RH Required indoor conditions; 22°C dbt, 70% RH Amount of free air circulated; 3.33 m/sec Coil dew point temperature; 14°C The required condition is achieved first by cooling and dehumi dification and then by heating. Estimate (1) Capacity of cooling coil intons and its efficiency. (ii) Capacity of heating coil in kW. ii) Amount of water vapour removed kg/sec.
- identifuy the limitations that exist within different types of water turbineQ: During a steam generator performance test, the following datawere recorded:Fuel Data: Coal mass flow rate = 2.5 kg/s; HVC = 32.5 MJ/kgSteam Data: Pressure = 13 bar; quality = 99% dry; mass flow rate =25kg/sFeed water data: saturated at 50oC.Calculate the boiler efficiencyDefine an isothermal process