scholarly journals Treating and Mechanical Packaging for the Fresh Fruit Packing House

1958 ◽  
Author(s):  
Samuel Ellison
Keyword(s):  
Air Conditioning ◽  
Heat Rate ◽  
Heat Energy ◽  
Fresh Fruit ◽  
Know How

When an air conditioning engineer is asked to calculate the load for a room such as this, he must know how many people will occupy the room. He must know this because each one of us here is liberating about 400 BTU per hour of heat energy. That is, when we are at rest. If we dance or do some similar exercise, our heat rate goes up to as much as 700 BTU per hour. Paper published with permission.

scholarly journals Waste heat energy utilization in refrigeration and air-conditioning

2018 ◽  
Vol 402 ◽  
pp. 012060
Author(s):  
Raman Kumar Singh ◽  
Saif Nawaz Ahmad ◽  
Neeraj Priyadarshi ◽  
Md Obaidur Rahman ◽  
A K Bhoi
Keyword(s):  
Air Conditioning ◽  
Waste Heat ◽  
Heat Energy ◽  
Energy Utilization

scholarly journals KAJI PERFORMANSI REFRIGERAN R-290, R-32, DAN R-410A SEBAGAI ALTERNATIF PENGGANTI R-22

2021 ◽  
Vol 4 ◽  
pp. 133-139
Author(s):  
Rikhard Ufie ◽  
Cendy S. Tupamahu ◽  
Sefnath J. E. Sarwuna ◽  
Jufraet Frans
Keyword(s):  
Air Conditioning ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Condensation Temperature ◽  
Vapor Compression ◽  
Know How ◽  
Evaporation Temperature ◽  
Vapor Compression Cycle ◽  
Compression Cycle ◽  
Refrigeration Capacity

Refrigerant R-22 is a substance that destroys the ozone layer, so that in the field of air conditioning it has begun to be replaced, among others with refrigerants R-32 and R-410a, and also R-290. Through this research, we want to know how much Coefficient of Performance (COP) and Refrigeration Capacity (Qe) can be produced for the four types of refrigerants. The study was carried out theoretically for the working conditions of the vapor compression cycle with an evaporation temperature (Tevap) of 0, -5, and -10oC, a further heated refrigerant temperature (ΔTSH) of 5 oC, a condensation temperature (Tkond) of 45 oC and a low-cold refrigerant temperature. (ΔTSC) 10 oC and compression power of 1 PK . The results of the study show that the Coefficient of Performance (COP) in the use of R-22 and R-290 is higher than the use of R-32 and R-410a, which are 4,920 respectively; 4,891; 4.690 and 4.409 when working at an evaporation temperature of 0 oC; 4.260; 4,234; 4.060 and 3.812 when working at an evaporation temperature of -5 oC; and amounted to 3,730; 3,685; 3,550 and 3,324 if working at an evaporation temperature of -10 oC. Based on the size of the COP, if this installation works with a compression power of 1 PK, then the cooling capacity of the R-22 and R-290 is higher than the R-32 and R-410a, which are 3,617 respectively. kW; 3,597 kW; 3,449 kW and 3,243 kW. If working at an evaporation temperature of 0 oC; 3.133 kW; 3.114 kW; 2,986 kW and 2,804 kW if working at an evaporation temperature of -5 oC; and 2,741 kW; 2,710 kW; 2,611 kW and 2,445 kW if working at an evaporation temperature of -10oC.

scholarly journals Предизвикателства при проектиране, изграждане и експлоатация на пасивна сграда в България

2020 ◽  
pp. 61-76
Keyword(s):  
Energy Efficient ◽  
Air Conditioning ◽  
Methodological Framework ◽  
Construction Sector ◽  
Passive House ◽  
Know How ◽  
Building Systems ◽  
Efficient Construction ◽  
House Standard ◽  
Design Construction

Challenges to the Design, Construction and Exploitation of a Passive Building in Bulgaria The construction of buildings that have to achieve the idea of a sustainable and energy-efficient construction sector requires a study of passive buildings. Specific requirements for the design, construction and exploitation of a passive building leading to limited flexibility in terms of heating, ventilation and air-conditioning, renewable energy, modern know-how, the introduction of highly efficient building systems, the lack of experience of Bulgarian producers present the relevance of the topic and justify a more detailed study. The aim of the article is to analyze the challenges in the design, construction and exploitation of the passive building in Bulgaria and on this basis draw generalized conclusions and make recommendations for improving the implementation of projects according to the Passive House Standard. The content of the article is structured as follows: 1) Literature review of technological features in the design, construction and exploitation of a Passive House; 2) Methodological framework of the study; 3) Assessment of the challenges in the design, construction and exploitation of a passive building in Bulgaria; 4) Summary of the results and recommendations. The last part of the article summarizes and recommends the challenges of implementing this type of projects related to the characteristics of the construction’s technologies and conditions for exploitations.

The Optimum Windshield-Defog and Passenger-Comfort Methods of a Vehicle in all Seasons

2012 ◽  
Vol 249-250 ◽  
pp. 696-701
Author(s):  
King Leung Wong ◽  
Wen Li Chen ◽  
Yung Chang Li
Keyword(s):  
Air Conditioning ◽  
Numerical Analyses ◽  
Control Panel ◽  
Passenger Comfort ◽  
Know How ◽  
Air Temperatures ◽  
Conditioning Control

The knowledge and principles of air conditioning as well as numerical analyses and experiments are applied to obtain the various defog guides depending on extreme wet-conditions and the various outside air temperatures in all seasons. The defog guides can be listed as a leaflet to let the drivers know how to operate their air-conditioning control panel properly to defog the windshield with suitable air to obtain the safe and comfortable driving.

scholarly journals RANCANG BANGUN ALAT PENGERING SISTEM ISOLATOR BERLAPIS PAPAN BATU KERIKIL SEBAGAI PENYIMPAN PANAS

2018 ◽  
Vol 15 (2) ◽  
pp. 170
Author(s):  
Juandi M ◽  
Ismawan Ismawan ◽  
Usman Malik
Keyword(s):  
Moisture Content ◽  
Heat Storage ◽  
Heat Rate ◽  
Heat Energy ◽  
Biomass Energy ◽  
Energy Sources ◽  
Total Rate ◽  
Drying Time ◽  
Average Biomass ◽  
Coconut Shells

Research on the design of a dryer with an insylation system made of pebble and board for heat storage. This research as conducted using experimental method by making a dryer using biomass energy sources . The objectives of the study were to measurins the heat rate lost from each side of the dryer, the heat energy generated from the combustion of the coconut shell  the moisture content of drying wet clothing, the efficiency of the drying time The results showed the design of a dryer with an insylation system made of pebble and board for heat storage works well. The temperature inside the room is ranges from (40-68°C). The total rate of heat energy lost in the 10th minute is 6,527.54 J/s and continued to decrease to 60th minute by 3263.77 J/s. The heat energy rate resulting from the combustion of coconut shells at 10th mins is 10520 J/s and continued to decrease to 60th minute by 1753.33 J/s. Reduced moisture content of wet clothes reached 2.439% at 60 minutes. Efficiency of drying time reaches 85.7%. The efficiency of the average biomass energy source is 90%.

scholarly journals The Effect of Opening Size and Location on the Performance of Reinforced Concrete T-Beams under Pure Torque

2020 ◽  
Vol 27 (2) ◽  
pp. 46-53
Author(s):  
Mazin B. Abdulrahman ◽  
Layth A. Al-Jaber ◽  
Saba S. Hasan
Keyword(s):  
Reinforced Concrete ◽  
Health Services ◽  
Air Conditioning ◽  
Reference Beam ◽  
The Other ◽  
Experimental Program ◽  
Torsional Moment ◽  
Know How ◽  
Applied Torque ◽  
Electrical Cables

In modern buildings, transverse openings are often used in order to pass the pipes of health services, electrical cables or air conditioning ducts and other prepuce. The presence of these openings leads to a weakening of the beam so it must work to investigate the behavior of these beams in order to know how the presence of openings affects beam resistance. In this research, the behavior of reinforced concrete T-beams with circular openings exposed to pure torsional moment is studied. The experimental program involves testing of five beams with same dimensions and reinforcements. One of them is solid beam and used as reference for comparison with other beams with an opening and the other four T- beams containing circular openings of deferent dimension(100 and 150) and location(Lc/2 and Lc/3). Practical results show that the Tbeam with circular openings of diameter (100mm) with different locations (Lc/2 and Lc/3), where Lc is the clear span of the beam, have an ultimate torsional capacity lower than that for solid beam by about (23% and 30%) respectively. The increase of the openings size causes a significant decrease in torsional capacity, where the beams with circular openings of diameter (150mm) with different locations (Lc/2 and Lc/3) have an ultimate torsional capacity lower than that for solid beam by about (56 % and 61%) respectively. Practical results show also that the presence of circular openings with diameter of 47% and 71% from the total depth increases the angle of twist significantly as compared with reference beam for the same applied torque level.

Air-Conditioning Using Waste Heat Energy

2015 ◽  
Author(s):  
Raja Kumar ◽  
A. Kumar ◽  
Mahrous Abd Rabbou ◽  
Najem Qambar
Keyword(s):  
Air Conditioning ◽  
Waste Heat ◽  
Heat Energy

Beam-radiation effects on wool in the ESEM

1986 ◽  
Vol 44 ◽  
pp. 674-675
Author(s):  
G.D. Danilatos
Keyword(s):  
Electron Beam ◽  
Radiation Effects ◽  
Research Work ◽  
Beam Radiation ◽  
Liquid Environment ◽  
Know How ◽  
Environmental Sem

The advent of the environmental SEM (ESEM) has made possible the examination of uncoated and untreated specimen surfaces in the presence of a gaseous or liquid environment. However, the question arises as to what degree the examined surface remains unaffected by the action of the electron beam. It is reasonable to assume that the beam invariably affects all specimens but the type and degree of effect may be totally unimportant for one class of applications and totally unacceptable for another; yet, for a third class, it is imperative to know how our observations are modified by the presence of the beam. The aim of this report is to create an awareness of the need to initiate research work in various fields in order to determine the guiding rules of the limitations (or even advantages) due to irradiation.

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