Thermodynamische Eigenschaften (R407A)

Table of Contents

Komposition:

(R-32 / 125 / 134a) • (20 / 40 / 40 Gew.-%)

Ersetzt:

R-22

Anwendung:

Gewerbe- und Industriekühlung bei mittleren und niedrigen Temperaturen

Leistung:

Niedrigere Austrittstemperatur
Die Kapazität entspricht am ehesten der von R-22
Ähnliche P/T- und Strömungseigenschaften = keine Komponentenänderungen

Schmiermittel:

Polyolester-Schmiermittel

Thermodynamische Eigenschaften

Edit
TEMP. (F)	Druckflüssigkeit (psia)	Druckdampf (psia)	Dichte Flüssigkeit (lb/ftˆ3)	Dichte Dampf (lb/ftˆ3)	Enthalpieflüssigkeit (Btu/lb)	Enthalpiedampf (Btu/lb)	Entropieflüssigkeit (Btu/R-lb)	Entropiedampf (Btu/R-lb)
-60	10.8	7.6	88.81	0.164	-6.1454	95.41	-0.01496	0.2434
-55	12.5	8.9	88.26	0.189	-4.6163	96.12	-0.01117	0.2418
-50	14.3	10.3	87.72	0.218	-3.0826	96.82	-0.00741	0.2404
-45	16.4	11.9	87.17	0.250	-1.5440	97.52	-0.00369	0.2390
-40	18.6	13.7	86.61	0.285	0.000	98.21	0.00000	0.2376
-35	21.1	15.7	86.05	0.325	1.5496	98.90	0.00366	0.2364
-30	23.9	18.0	85.49	0.368	3.1052	99.59	0.00729	0.2351
-25	26.9	20.4	84.92	0.416	4.6672	100.3	0.01088	0.2340
-20	30.3	23.2	84.35	0.469	6.2358	100.9	0.01446	0.2329
-15	33.9	26.2	83.77	0.527	7.8114	101.6	0.01800	0.2319
-10	37.9	29.6	83.18	0.591	9.3945	102.3	0.02152	0.2309
-5	42.2	33.2	82.59	0.660	10.99	102.9	0.02502	0.2299
0	46.9	37.2	81.99	0.736	12.58	103.6	0.02849	0.2290
5	52.0	41.6	81.39	0.818	14.19	104.2	0.03195	0.2281
10	57.5	46.3	80.77	0.908	15.81	104.8	0.03538	0.2273
15	63.4	51.4	80.15	1.005	17.44	105.4	0.03880	0.2264
20	69.8	57.0	79.52	1.111	19.07	106.0	0.04219	0.2257
25	76.7	63.0	78.88	1.225	20.72	106.6	0.04558	0.2249
30	84.0	69.5	78.23	1.349	22.38	107.2	0.04894	0.2242
35	91.9	76.5	77.57	1.482	24.05	107.8	0.05230	0.2235
40	100	84.1	76.90	1.626	25.73	108.3	0.05564	0.2228
45	109	92.1	76.21	1.782	27.42	108.9	0.05897	0.2221
50	119	101	75.52	1.949	29.13	109.4	0.06229	0.2214
55	129	110	74.81	2.130	30.85	109.9	0.06561	0.2208
60	140	120	74.08	2.325	32.59	110.4	0.06892	0.2202
65	151	130	73.34	2.534	34.35	110.9	0.07222	0.2195
70	164	142	72.58	2.760	36.12	111.3	0.07552	0.2189
75	176	154	71.80	3.003	37.91	111.7	0.07882	0.2182
80	190	166	71.01	3.265	39.72	112.1	0.08213	0.2176
85	204	180	70.19	3.548	41.55	112.5	0.08543	0.2169
90	220	194	69.34	3.853	43.40	112.9	0.08874	0.2163
95	236	209	68.48	4.183	45.27	113.2	0.09206	0.2156
100	252	225	67.58	4.539	47.17	113.4	0.09539	0.2148
105	270	242	66.65	4.925	49.10	113.7	0.09874	0.2141
110	289	260	65.69	5.345	51.06	113.9	0.1021	0.2133
115	308	279	64.69	5.801	53.06	114.1	0.1055	0.2125
120	329	299	63.64	6.298	55.09	114.2	0.1089	0.2116
125	350	320	62.55	6.843	57.16	114.2	0.1124	0.2107
130	373	342	61.39	7.443	59.28	114.2	0.1159	0.2097
135	396	365	60.17	8.106	61.45	114.1	0.1194	0.2086
140	421	390	58.87	8.843	63.69	113.9	0.1230	0.2074

FREQUENTLY ASKED QUESTIONS

What is the composition of R407A refrigerant?

The composition of R407A refrigerant is a blend of 20% R32, 40% R125, and 40% R134a by weight. This specific composition is designed to provide a close match to the performance of R22 refrigerant, which it is intended to replace.

What are the advantages of using R407A refrigerant in medium and low-temperature applications?

R407A refrigerant offers several advantages in medium and low-temperature commercial and industrial refrigeration applications. It has a lower discharge temperature, which can improve system efficiency and reduce compressor wear. Additionally, R407A has similar P-T and flow properties to R22, which means that no component changes are required when retrofitting existing systems.

What type of lubricant is recommended for use with R407A refrigerant?

Polyolester lubricant is recommended for use with R407A refrigerant. This type of lubricant is compatible with the refrigerant and helps to ensure proper system operation and longevity.

How does the pressure-temperature relationship of R407A refrigerant compare to R22?

The pressure-temperature relationship of R407A refrigerant is similar to that of R22. As shown in the thermodynamic properties table, the pressure-temperature curve of R407A is close to that of R22, which makes it a suitable replacement in many applications.

What are the implications of using R407A refrigerant on system design and operation?

The use of R407A refrigerant has implications for system design and operation. For example, the lower discharge temperature of R407A may require adjustments to compressor sizing and system piping. Additionally, the similar P-T and flow properties of R407A to R22 may require adjustments to system controls and operating parameters.

How can the thermodynamic properties of R407A refrigerant be used to optimize system performance?

The thermodynamic properties of R407A refrigerant can be used to optimize system performance by selecting the optimal operating conditions and system design parameters. For example, by analyzing the pressure-temperature relationship of R407A, designers can optimize compressor sizing, piping, and system controls to minimize energy consumption and maximize system efficiency.