bank of 120-employees is maintained at 24°C db and 50% RH. The heat gain due to heat transfer through walls, roof, ..etc is 10 kW. The outside air temperature is 35°C and its relative humidity is 60%. Calculate the followings: (a) Ventilation air required. (b) Sensible and latent heat gains due to occupants. (CLF = 0.86) (c) Volumetric flow rate of supply air if the supply temperature is 18°C.

bank of 120-employees is maintained at 24°C db and 50% RH. The heat gain due to heat transfer through walls, roof, ..etc is 10 kW. The outside air temperature is 35°C and its relative humidity is 60%. Calculate the followings: (a) Ventilation air required. (b) Sensible and latent heat gains due to occupants. (CLF = 0.86) (c) Volumetric flow rate of supply air if the supply temperature is 18°C.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter46: Room Air Conditioners

Section: Chapter Questions

Problem 15RQ

See similar textbooks

Similar questions

Solve all please i give thumb up? Outside air at 15°C and 20% relative humidity is admitted at a volumetric rate of 15m³/min into an air conditioning system composed of a simple heating section followed by a humidification section, which must supply air at 27 °C and 65% relative humidity. The airflow temperature between the heating and humidifying sections is 22°C and the entire air conditioner operates at 70kPa. Determine, using calculations: (a) the rate of heat supply to the heating section, in kW, is ______. (b) the wet bulb temperature of the air after the heating section, in °C, is ______. (c) the mass flow rate of steam in the humidification section, in g/s, is ______. (d) the temperature of the steam injected into the humidification section for a steam pressure of 200kPa, in °C, is _______
Air at 30° C dry bulb temperature and 60% relative humidity is passed through a cooling coil at the rate of 250 m³/min. The air leaves the cooling coil at 14° C dry bulb temperature. If the by-pass factor of the cooling coil is 0.1, find: (a) surface temperature of the cooling coil or ADP, (b) relative humidity of the air leaving the cooling coil, (c) capacity of the cooling coil in kW, and (d) sensible heat factor
Calculate the amount of sensible heat that must be added to 50 kg of air at 30 deg C Tdb and 23 deg C Twb to raise the temperature of air to 50 deg C dry bulb.
A small auditorium is required to be maintained at 22 C DBT and 70% RH. The ambient conditions are 30 C DBT and 75% RH. The amount of free air circulated is 200m3/min. The required conditions are achieved by first cooling and dehumidifying through a cooling coil having apparatus dew point of 140C and then by heating. With the help of psychrometric chart, find: i) capacity of cooling coil in TR and its by pass factor, ii) the amount of water vapor removed by the cooling coil in kg/hr, ii) capacity of heating coil in KW and its surface temperature. Assume bypass factor as 0.2 IES1992
Calculate the internal energy change (BTU / s) and enthalpy change (BTU / s) for 4lb / s of air that increases its temperature from 40 to 340 ° F isentropically.
PROPERTIES OF CERTAIN REFRIGERANTS At 5°F, how much denser is R-134a than R-124?
In an air conditioning system 30 emm of fresh out door air is introduced at 43°C DBT and 30% RH. The remaining air is recirculated from the room maintained at 25°C DBT and 50% RH. The bypass factor of cooling coil is 0.15 and apparatus dew point Is 11.8°C, RSH 100 kW and RLH 15 kW. Determine: (1) Humidity ratios for outdoor and Room conditions. (2) OASH & OALH (3) ERSH and ERLH (iv) Supply air temperature (v) Supply air volume flow rate using ERSH (vi) Temperature at inlet to cooling coil by assuming density of niside and outside air sanie Given that saturation pressures of water at 25°C and 43C are 3.1693 KP and 8.6459 KPa respectively. Show the process on psychrometric chart standard atmospheric pressure=1.01325 bar.
The following data refers to an air conditioning system to be designed for an industrial process for hot and wet climate. Outside conditions = 38o C DBT and 74 % RH. Required conditions are 23o C DBT and 65 % RH. This is achieved by cooling and dehumidifying and then by heating. If 42 m 3 of air is absorbed by the plant every minute, find the capacity of cooling coil in TR, capacity of heating coil in kW and amount of water removed per hour
For air properties use online source: https://www.peacesoftware.de/einigewerte/luft_e.html The compressor is operating at steady-state increasing pressure of R-22 refrigerant from 4 bars to 14 bars. Temperature was rising during the process from 12C to 90C. The inlet volumetric flow rate is 1 m3/min and inlet diameter is 0.03m. At the exit the diameter is the same. Heat flow to the surroundings can be neglected. Determine: a.Mass flow rate [kg/s] SHOW AND EXPLAIN ALL STEPS PLEASE thanks
For air properties use online source: https://www.peacesoftware.de/einigewerte/luft_e.html The compressor is operating at steady-state increasing pressure of R-22 refrigerant from 4 bars to 14 bars. Temperature was rising during the process from 12C to 90C. The inlet volumetric flow rate is 1 m3/min and inlet diameter is 0.03m. At the exit the diameter is the same. Heat flow to the surroundings can be neglected. Determine: a.Mass flow rate [kg/s] SHOW AND EXPLAIN ALL STEPS PLEASE
In an air conditioning system 30 cmm of fresh out door air is introduced at 43°C Dbt and 30% RH. The remaining air is recirculated from the room maintained at 25°C DBT and 50% RH. The bypass factor of cooling coll is 0.15 and apparatus dew point is 11.8°C, RSH = 100 kW and RLH= 15 kW. Determine: (1) Humidity ratios for outdoor and Room conditions. (Ii) OASH & OALH (iii) ERSH and ERLH
Atmospheric air at 40°C dbt and 55% RH is passed over a cooling coll at the rate of 600 m/mint. At exit from coil the air is saturated and its temperature is 8°C. The condensate also leaves at 8°C. Determine the amount of condensate leaving coll per minute and refrigeration in kW. The specific heat of superheated steam may be assumed to be 1.88 kJ/kg-K. Solve the problem without psychromatic chart.