HVAC Lab

2. Conduction is function of the environment's humidity and the airflow/exchange next to the skin. True False 3. One of the amendments to Regulation 854 that came into force in 2016 is strengthening and improving requirements regarding high visibility safety apparel. True False 4. Cold stress is also known as "thermal strain". True False 5. Dynamic force presents a greater risk of strain than static force. True False 6. In underground climate, auto compression of air adds 4-60C/km to the wet bulb temperature. True False An industrial machinery gives out 112 dBA of noise 1 m away from the source, which requires double hearing protection. You are a worker performing work for 8-hrs around the machinery and you are required to wear double hearing protection. An earplug which has an NRR of 29 dB and an earmuff with an NRR of 31 dB. The suggested derrating percentage of the hearing protections are 60% and 55% of the NRR, respectively. Does the double hearing protection reduce the noise level…

The Room comfort condition in Malaysian Standard MS1525:2014 are to dependent on various factors including air temperature, mean radiant temperature, humidity, clothing insulation, metabolic rate and air movement preference of the occupant. Explain details about room comfort condition should consider the following three main factors: i. Dry bulb temperature; ii. Relative humidity; and iii. Air movement (air velocity).

The beating of the human heart can be modeled by a thermodynamic cycle. In this chapter, we have used PV diagrams to show processes occurring for a gas. Such diagrams can also be used for a liquid, such as blood in the heart. The figure below shows an idealized cycle for the left ventricle (LV) during a single beat of the heart. P(mm Hg) 120 78.0 20.0 10.0 A V (mL) 44.0 149 The cycle begins at point A with the opening of the mitral valve, which fills the LV with blood from the left atrium. During this process, the pressure and volume of the blood in the ventricle increase linearly until the mitral valve closes at point B. At that point, the muscles surrounding the LV contract, increasing the pressure of the blood. Because both the mitral and the aortic valves are closed, and because blood is essentially incompressible, the process is isovolumetric. The pressure increases to the diastolic pressure of 78.0 mm Hg (1 mm Hg = 133.322 Pa) at point C. Now, the aortic valve opens, pumping the…

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.

The published technical information is shown below for TempStar air conditioners. Rating is provided for an outside air temperature of 95°F and an inside temperature of 80°F. For the model N4A318AKA: a.What is the COP [1.96] b.What is COP Carnot [36.0]

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9:43 am Fri 24 Dec * 62% + : 0 King Abdul Aziz University Thermofluids AE300 Aero. Eng. Dept Faculty of Engineering Assignment 6 I/II law, Entropy, Cycles Handwritten assignment. Detailed answers are expected. Use your university ID. What is a pure substance? Write any four examples of pure substance. Draw tv and Pv diagram of water showing critical pressure and temperature magnitudes. Define specific heats. Differentiate between specific heats at constant pressure and constant volume. Give their examples. Write the values of cp, cv, R, and y for air and combustion products. 1. 2. 3. A 0.2 m³ vessel contains 120+last two digits kg of water at 90 ° C. Determine pressure, specific and total internal energy, specific and total enthalpy, and specific and total entropy. A vessel contains 10 kg of water at 200 kPa. Determine pressure, specific and total internal energy, specific and total enthalpy, and specific and total entropy. Consider 5 different cases/states: T= 30 ° C 4. а. b. T= Tsat…

Need help with engineering problem.   Match the RTT term with its explanation: A: ddt(∫CVβρdᏉ)   B: ∫CSβρVcosθdAout   C: ∫CSβρVcosθdAin     A.       B.       C.       Match one of the following answers below to each letter.   A change within the control volume   Outflow of B from the ontrol volume   Inflow of B to the control volume

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No card B a m OO O N 95)1:47 mlms.hu.edu.jo/mod/qu Two tanks are placed on table: Tank (1) contains one kg of gas type A at Temperature T, (K), while Tank (2) contains one kg of gas type B at temperature [ (19/7) T,]. The tanks are then put into thermal contact with each other and heat flows between until the gases reach a common final temperature T,"tanks are insulated from all other boundaries". Knowing that the specific heat ratio (CvA /CvB) = (9/7) , The final temperature (K) will be : Select one: A. 1.375 T. B. 1.250 T. c. No enough information D. 1.625 T. E. 1.750 T. F. 1.875 T. G. 1.500 T, ...

Concentric tube heat exchanger lab(the question is): 1.Calculations organized properly: (Equations are to be set on the center of line with a complete line space above and below. 2.All equation quantities are to be defined by words and set with their units, 3.One sample of calculation are to be done for each equation).

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: 7⁰C

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A:EV 22.pdf QI/ Four kilograms of water are placed in an enclosed volume of 1 m³. Heat is added until the temperature is 150 ° C. Find the (a) pressure, (b) mass of the vapor, and (c) volume of the vapor. Q2/ A 1.343 × 10 ´ J fan is used in a large room to provide for air circulation. Assuming a well insulated, sealed room, determine the internal energy increase after 1 hour of operation.

b) For an Otto Engine the temperature at the end of combustion is 280 K. If the temperature in the gas side and coolant side of the wall are 177 °C and 127 °C and cylinder wall thickness is 5 mm;

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Given: Consider an adiabatic steam turbine operating at steady-flow conditions. The known operating conditions are: Inlet conditions Exit (outlet) conditions Pressure (MPa) Temperature (°C) Velocity (m/s) Steam quality Mass flow rate (kg/s) Elevation (height) (m) 10 450 0.010 80.01 50.01 91.9 % 12.01 9.0 9.0 Required: Draw clear and consistent schematic for the problem representing the inlet and exit (outlet) conditions and label your schematic with the given conditions. Analyze the problem systematically using step-by-step CV energy and mass analyses, justify the equations, state your assumptions, and determine the following (circle your final answers): (a) The specific enthalpy values at inlet and exit of the turbine. (b) The mass flow rate of steam at exit. (c) The specific heat transfer. (d) The rate of change in the kinetic energy of the steam between inlet and exit. (e) The power output generated by the turbine. (f) The specific work output. (g) The specific volumes at inlet and…

T₁ = 10°C $₁ = 30% V₁ = 45 m³/min 10°C Heating coils Air T₂ = 22°C 2 Celllllll3= 25°C = 60% $1 = 30% Humidifier 22°C %09 = 50 AN EXAMPLE The amount of heat and mass at each point along with the properties of the air? 25°C I need a clear answer by hand, not by keyboard and fast answer within 20 minutes. Thank you | dybala 17

The results of air temperature measurements obtained a dry bulb temperature of 31 ° C and a wet bulb temperature of 21 ° C. Using a Psychrometric chart, determine the properties of the air as follows a. air humidity:. . . (%) b. Moisture content: ... (kg water / kg air) c. specific volume: ... (m3 / kg) d. enthapi: ... (kJ / kg) e. condensation temperature: ... (° C). If the air is in 162 m3 space, determine, f. air weight (dry air and water vapor) = answer (kg), g. the amount of water content in the space = answer (kg)

The refrigerating effect of a mini ice plant is 1 kW. How long (in minutes) will it take to reduce the temperature of 10 L of brine solution from 30 deg C to 0 deg C? The density of the brine solution is 1.15 g/ml and Cp 4.19 kJ/kg. a. 14.5 b. 17.8 C. d. 19.5 24.1

Each of the following statements describes a way of coping with temperature variation. Which scenario most likely includes positive heat transfer through convection? That is, in which scenario does Hconvection most likely have a positive (+) sign? Hanimal = +SR + IRin – IRout +/- Hconvection +/- Hconduction - Hevaporation + Hmetabolic Select one: a. A rabbit basking in the sun early in the morning. b. A lizard resting in the shade in a hot desert in the middle of the day. c. A bumblebee vibrating its flight muscles before flight. d. A ground squirrel hibernating in the winter. e. A bird fluffing its feathers on a cold day.

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