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Shenzhen Toyo Refrigeration Equipment Co., Ltd.

Phone13510242241 075584877928

Fax 0755-84878528

Address No.8 Building, Longxi Third Industrial Zone, Longcheng Street Office, Longgang District, Shenzhen

Product Encyclopedia⎝⎛欢乐拼三张⎞⎠ >> News >> Product Encyclopedia

Conversion formula of chiller
Time: 2017-12-04

Conversion formula of chiller

1.Calculation of heat flow in enclosure cold room = φ1 = KAa (tw-tn)

2. Calculation of cargo heat flow: φ2 = φ2a + φ2b + φ2c + φ2d

(1) Food heat flux = φ2a = m (h1-h2) /3.6t

(2) Heat flux of packaging materials and vehicles φ2b = mBbCb (t1-t2) /3.6t

(3) Breathing heat flow during cargo cooling φ2c = m (φ '+ φ' ') / 2

(4) Breathing heat flow when the cargo is refrigerated φ2d = (mz-m) * φ ''

3. Calculation of ventilation heat flow φ3 = φ3a + φ3b

(1) Heat exchange flow in cold room φ3a = (hw-hn) nVnpn / 3.6t

(2) New air heat flow required by the operator φ3b = 30nrpn (hw-hn)

4.Calculation of motor heat flow φ4 = 1000ΣPd * ξb

5.Calculation of operating heat flow φ5 = φ5a + φ5b + φ5c

(1) Lighting heat flux φ5a = φd * Ad

(2) Heat flow caused by door opening φ5b = nk '* nk * Vn * (hw-hn) * M * pn / (3.6 * 24)

(3) Heat flow of operator φ5c = 8/24 * nr * φr

I. Cooling equipment load: φs = φ1 + Pφ2 + φ3 + φ4 + φ5

P Cargo heat flow coefficient, take 1.3 for the cooling room, freezing room, and the refrigerating room where the cargo directly enters the refrigerating room without cooling, and for other cold rooms (freezing room, ice storage, and part of the refrigerated room) 1.0

Mechanical load calculation φj = (n1Σφ1 + n2Σφ2 + n3Σ3φ3 + n4Σφ4 + n5Σφ5) * R

n1 Seasonal correction factor for heat flux of the envelope structure, take 1

n2 reduction coefficient of cargo heat flow, take 0.3-0.6 for refrigerated refrigerated rooms, take a small value when the nominal volume of refrigerated rooms is large, take 0.5-0.8 for frozen refrigerated rooms, and take large values when the nominal volume is large.

The n3 synchronizing ventilation coefficient is 0.5-1, and the ratio of the maximum ventilation volume to the total daily ventilation volume of the entire library is a large value when the ratio is a large value.

R is the cooling loss compensation coefficient of the refrigeration device and the pipeline. The direct cooling system is 1.07, and the indirect cooling system is 1.12.


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